Re: Stus-List Help with folding prop insights?

[Jake Brodersen via CnC-List]

Francois,

 

It’s great to hear that someone else has had good experience with the Martec 
prop.  I’m happy with mine.  I will be sending it in for the first rebuild.  
I’ve owned the boat for 18 years and this is the first time it will be needed.  
Of course, in those 18 years I’ve only logged 800 hours of motoring…

 

Jake

 

Jake Brodersen

C 35 Mk-III “Midnight Mistress”

Hampton VA



 

 

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Francois 
Rivard via CnC-List
Sent: Monday, February 19, 2018 14:34
To: cnc-list@cnc-list.com; bwhitm...@sbcglobal.net
Cc: Francois Rivard <jeanfrancoisriv...@gmail.com>
Subject: Stus-List Help with folding prop insights?

 

Hi Bruce, 

 

I have a Martec folder on my boat (34+ also called 34/36) which is your boat's 
little sister.  

 

We've been using it for 3 seasons and it's world of difference in sailing speed 
compared to a fixed 3 blades.  It's measurably better in all conditions.  

 

What you need to get it going:  

 

- Martec is a phone call away and they are helpful the founder / inventor's son 
is probably going to be the guy you talk to.  He's pretty knowledgeable. 

 

- When I did it a couple years back, sending the blade axis to get reamed / new 
pin / new Monel cotter pin was $80.00 plus shipping.  A steal.

 

- The Monel cotter pin is an absolute must.  I would not trust what came with 
the boat, order one.  Most people don't know the difference and think that 
Stainless can't corrode. It can and does under water, especially when in 
constant contact with dissimilar metals like a bronze prop. The stainless steal 
pin will fail overtime causing the whole thing to fall apart.  No such issues 
with Monel.  

 

- Don't let him try and talk you into "upgrading" the blades to more pitch.  We 
did / had tons of vibrations / ended up using the old blades which work much 
better 

 

How it performs

 

- Forward top speed under power is the same as the 3 bladed prop

 

- If it's in good shape / with the right blades it doesn't vibrate that much

 

- Reverse is weak and takes patience to get the prop to reverse direction / re 
deploy both blades correctly.  Not much of an emergency brake

 

- You have to go in the engine compartment and look at the shaft position to 
make sure the prop is folded with blades horizontal for max speed when racing. 
If they are vertical the lower one will hang down / drag.  There should be a 
mark on the shaft.  I found that if I stop the engine with the transmission in 
gear, the prop is almost always lined-up properly

 

- The prop is known to be the least drag prop when folded for sailing 

 

- Some say that they become loose quickly / need frequent rebuilds.  I have 
used it 3 years (we sail all year long in GA too)  / check it whenever we go 
swimming / so far it's still slop free. 

 

For us on the lake, it works fine. We don't motor very long distances I 
typically burn about 20-30 gallons of fuel per year.  For us, it's more about 
top speed sailing  / we race a fair amount  / it fits the bill / it's 
inexpensive. 

 

Best of luck / email me if you need more details.  

 

-Francois Rivard

1990 34+ "Take Five" 

Lake Lanier, GA

 

___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
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Stus-List Help with folding prop insights?

[Francois Rivard via CnC-List]

Hi Bruce,

I have a Martec folder on my boat (34+ also called 34/36) which is your
boat's little sister.

We've been using it for 3 seasons and it's world of difference in sailing
speed compared to a fixed 3 blades.  It's measurably better in all
conditions.

What you need to get it going:

- Martec is a phone call away and they are helpful the founder / inventor's
son is probably going to be the guy you talk to.  He's pretty
knowledgeable.

- When I did it a couple years back, sending the blade axis to get reamed /
new pin / new Monel cotter pin was $80.00 plus shipping.  A steal.

- The Monel cotter pin is an absolute must.  I would not trust what came
with the boat, order one.  Most people don't know the difference and think
that Stainless can't corrode. It can and does under water, especially when
in constant contact with dissimilar metals like a bronze prop. The
stainless steal pin will fail overtime causing the whole thing to fall
apart.  No such issues with Monel.

- Don't let him try and talk you into "upgrading" the blades to more
pitch.  We did / had tons of vibrations / ended up using the old blades
which work much better

How it performs

- Forward top speed under power is the same as the 3 bladed prop

- If it's in good shape / with the right blades it doesn't vibrate that much

- Reverse is weak and takes patience to get the prop to reverse direction /
re deploy both blades correctly.  Not much of an emergency brake

- You have to go in the engine compartment and look at the shaft position
to make sure the prop is folded with blades horizontal for max speed when
racing. If they are vertical the lower one will hang down / drag.  There
should be a mark on the shaft.  I found that if I stop the engine with the
transmission in gear, the prop is almost always lined-up properly

- The prop is known to be the least drag prop when folded for sailing

- Some say that they become loose quickly / need frequent rebuilds.  I have
used it 3 years (we sail all year long in GA too)  / check it whenever we
go swimming / so far it's still slop free.

For us on the lake, it works fine. We don't motor very long distances I
typically burn about 20-30 gallons of fuel per year.  For us, it's more
about top speed sailing  / we race a fair amount  / it fits the bill / it's
inexpensive.

Best of luck / email me if you need more details.

-Francois Rivard
1990 34+ "Take Five"
Lake Lanier, GA


Subject: Stus-List Help with folding prop insights?

Hello all,

I have a fixed, 3 bladed prop on Astralis currently, and suspect that its
slowing us down here in Florida where we just don't get the wind like we
did on Lake Michigan, so we rarely see much over 12 kts or so.  I'm
thinking I'd like to get a little more speed out of her, and one area of
improvement could be the fixed prop.

In the pile of old parts that the prior owner left us, I found an old, and
obviously used Martec Eliptec RH18DX12P-3, two blade folding prop (it is
not geared).  I have the blades and hub, but at the moment cannot find the
center pin.  It seems like Martec may still be in the business of repairing
these props.

I've read some of the various reviews, and I understand there are better
solutions out there, but clearly I'd be dropping a few boat bucks to pull
it off.

Do any of you have direct experience with the Martec Eliptec, and can
advise me whether I'll hate this thing from a performance or vibration
point of view if I get a pin and put it on the boat?

I am OK with somewhat limited reverse, but would be anxious if I was giving
up a lot of forward power.  And, I really don't want a lot of vibration,
especially if it's going to do things like tear up the cutlass bearing.

Thanks for your insights!

Bruce C. Whitmore
1994 C 37/40+, "Astralis"
Madeira Beach, FL
847.404.5092
bwhitm...@sbcglobal.net<mailto:bwhitm...@sbcglobal.net>
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Help with folding prop insights?

[Hoyt, Mike via CnC-List]

Hi Rick

I have a 10 year old Martec elliptical RHDH14P-3 one inch shaft that I replaced 
with a Flex-o-fold last year. This was used with Yanmar 3GM30F.   It is 
available

Mike
Persistence
Halifax

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Rick Brass 
via CnC-List
Sent: Saturday, February 17, 2018 1:17 AM
To: cnc-list@cnc-list.com
Cc: Rick Brass
Subject: Re: Stus-List Help with folding prop insights?

Bruce;

My 38, Imzadi, came with a 16x10 ½ RH Martec prop when I bought her in 2003. 
16x10 ½ was the prop recommended for my 15,000lb boat with a 36hp engine and 
whatever gear reduction I have. I was quite pleased with the performance. It 
would get hull speed (about 7.2 kn) at 2400 RPM and reach 3000 in a pinch. It 
took me a month or two to learn the trick to reverse: Hit the throttle high to 
unfold the prop (with moderate forward speed and moderate throttle, the flow of 
water keeps the prop partly closed... so performance sucks), once the boat is 
moving aft fast enough for flow over the rudder you shift into neutral and 
steer with the rudder. I've been backing into my slips for 14 years and have 
only hit the dock a couple of times. BTW, the prop does give a fair amount of 
prop walk.

My prop must have been near the end of its third life, because after a couple 
of years one of the "ears" in the hub broke and I had to replace the prop with 
a 2 blade fixed prop of the  same diameter and pitch. I found that I lost about 
½ knot of boat speed when sailing in light to moderate winds.

I bought a used Martec that was 17x10 and had Martec refurb it. I was greatly 
over propped, and could barely get to 2000RPM. Also had a vibration because the 
prop tips were too close to the bottom of the boat, I think.

I replaced that Martec prop with a Gori geared prop: Their recommended prop is 
a 16 ½ x10 was still overpropped because of the blade profile, and frankly, 
after 3 years of use, I was more satisfied with the Martec. When I  discussed 
the overprop situation with them while the boat was being painted last winter, 
they said that the 10 pitch was the lowest they had in the 16 ½ diameter, and 
going to a smaller diameter would involve getting a whole new propeller. At 
their suggestion I had a local shop trim 1/2'" from the tip of each blade. It 
is better, but still not as good as the Martec.

You mention that your prop is 18x12, which seems like a lot of prop depending 
on your engine max RPM and HP, gear reduction, and boat weight. Before you 
spend money on reconditioning the prop, you might want to ask Martec what prop 
diameter and pitch they recommend for your boat.

Rick Brass
Washington, NC



From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Bruce via 
CnC-List
Sent: Thursday, February 15, 2018 8:28 PM
To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>
Cc: bwhitm...@sbcglobal.net<mailto:bwhitm...@sbcglobal.net>
Subject: Stus-List Help with folding prop insights?

Hello all,

I have a fixed, 3 bladed prop on Astralis currently, and suspect that its 
slowing us down here in Florida where we just don't get the wind like we did on 
Lake Michigan, so we rarely see much over 12 kts or so.  I'm thinking I'd like 
to get a little more speed out of her, and one area of improvement could be the 
fixed prop.

In the pile of old parts that the prior owner left us, I found an old, and 
obviously used Martec Eliptec RH18DX12P-3, two blade folding prop (it is not 
geared).  I have the blades and hub, but at the moment cannot find the center 
pin.  It seems like Martec may still be in the business of repairing these 
props.

I've read some of the various reviews, and I understand there are better 
solutions out there, but clearly I'd be dropping a few boat bucks to pull it 
off.

Do any of you have direct experience with the Martec Eliptec, and can advise me 
whether I'll hate this thing from a performance or vibration point of view if I 
get a pin and put it on the boat?

I am OK with somewhat limited reverse, but would be anxious if I was giving up 
a lot of forward power.  And, I really don't want a lot of vibration, 
especially if it's going to do things like tear up the cutlass bearing.

Thanks for your insights!

Bruce C. Whitmore
1994 C 37/40+, "Astralis"
Madeira Beach, FL
847.404.5092
bwhitm...@sbcglobal.net<mailto:bwhitm...@sbcglobal.net>

___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Help with folding prop insights?

[Gary Russell via CnC-List]

Rodney is correct, of course.  But also consider that some C models come
with different gear ratios for the same boat.  Get the ratio off the
gearbox name plate before ordering a prop.  My PO didn't do that and I got
a boat with the wrong prop.

Gary
S/V Kaylarah
'90 C 37+
East Greenwich, RI, USA

~~~_/)~~


On Sun, Feb 18, 2018 at 10:06 AM, Rodney Meryweather via CnC-List <
cnc-list@cnc-list.com> wrote:

> The engine and gear ratio, together with the engine power, are critical
> for any propeller sizing.
> When choosing an engine &/or propeller for your boat, it is important to
> consider the effect of the gearbox ratio on the propeller. Most marine
> diesel engines have a reduction gearbox, which makes the shaft turn slower
> than the engine, at a speed more suitable for the propeller.
> The gear box ratio determines the rotation speed of the propeller in
> revolutions per minute (rpm):
>   Propeller speed (srpm) = Engine rated rpm ÷ Gearbox reduction
> ratio
>
> With an existing engine there were generally several different gear ratios
> available to choose from at the time of install depending on shaft angle.
> It is best that you get your actual ratio off the gearbox tag. It is
> generally stamped on the top or side of the gearbox expressed as a ratio or
> number (example: 2.64:1 or A–2.64).
>
> The best method to get the actual ratio is to use your cell phone camera &
> take a photo of the plate on the transmission (beats hanging upside down
> reading it with a mirror and a flash light).
>
> Before selecting a propeller type you should look at the advantages,
> features, benefits & differences in performance relative to your sailing
> style/boat use so that you can make an informed decision. I know there is a
> lot of information below but I want to make sure you choose the correct
> propeller to suit your sailing style/boat use.
>
> I personally am looking at the Variprop Feathering or Gori Folding
> The Variprofile feathering propeller is a unique feathering propeller and
> the first to incorporate the hi-tec GAWN/KAPLAN profile. The only
> feathering propeller with a shaped blade which is 7-11% more efficient than
> the std flat bladed feathering propeller. This profile has been used
> primarily for high performance power boat applications, but also for rudder
> design and in the aircraft industry.
>
> Normally associated with high-speed power boat and aircraft propeller
> blades the Gawn/Kaplan blade profile & slim hub delivers very low drag,
> excellent Hydro-dynamics while running extremely more quietly and
> efficiently under power than other propellers with the result that the
> VariProfile delivers speed normally associated with fixed propellers or the
> best folding propellers in both fwd. & reverse with its continuous
> independently variable adjustable external pitch control (patented).
> Forward and Reverse pitches can be changed independently in just seconds,
> even underwater.
>
> The Gori is a folding propeller with two(2) pitches in fwd & full 100%
> reverse thrust, no prop walk. The Gori does not auto-rotate/spin under sail
> as does a feathering propeller at higher speeds, or have one blade drop
> down and increase drag or not open when coming into the slip.
>
> The drag for the Gori 3-blade propellers is the lowest of any fixed,
> feathering or folding propellers (even less than any 2-blade) giving
> increased sailing speeds & less turbulence over the rudder, enabling you to
> point higher.  The unique folding design prevents seaweed etc from fouling
> on the propeller giving increased speed potential. You will see an increase
> in sailing speeds over your fixed 3-blade propeller. The drag reduction
> will amount to 0.95 + of a knot for a 36 footer.
>
> The blades of the Gori propeller are designed with both camber, curve &
> twist to them, which gives increased efficiency (thrust) throughout the rpm
> range, which will always give you better motoring performance
> (speed/thrust), especially in heavy seas, or when motor sailing with the
> "Overdrive" Function.
> The Gori 3-blade "Overdrive" function, by increasing the blade pitch
> angle, gives increased thrust and speed - at the same rpm or when motoring
> sailing, or the same boat speed at much lower rpms.  The result is less
> engine noise, less vibration, increased fuel economy & therefore a greater
> cruising range.
> The Gori 3-blade propeller is the only propeller that will give you
> exactly the same performance in reverse as in forward due to the unique
> blade folding action of presenting the identical leading edge in reverse as
> in forward - resulting in no 'prop walk'. See
> http://ab-marine.com/folding/gori/ & http://gori-propeller.com/
>
> Rodney Meryweather
>
>
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   

Re: Stus-List Help with folding prop insights?

[Rodney Meryweather via CnC-List]

The engine and gear ratio, together with the engine power, are critical for any 
propeller sizing.
When choosing an engine &/or propeller for your boat, it is important to 
consider the effect of the gearbox ratio on the propeller. Most marine diesel 
engines have a reduction gearbox, which makes the shaft turn slower than the 
engine, at a speed more suitable for the propeller.  
The gear box ratio determines the rotation speed of the propeller in 
revolutions per minute (rpm):
  Propeller speed (srpm) = Engine rated rpm ÷ Gearbox reduction ratio
 
With an existing engine there were generally several different gear ratios 
available to choose from at the time of install depending on shaft angle.  It 
is best that you get your actual ratio off the gearbox tag. It is generally 
stamped on the top or side of the gearbox expressed as a ratio or number 
(example: 2.64:1 or A–2.64).
 
The best method to get the actual ratio is to use your cell phone camera & take 
a photo of the plate on the transmission (beats hanging upside down reading it 
with a mirror and a flash light).

Before selecting a propeller type you should look at the advantages, features, 
benefits & differences in performance relative to your sailing style/boat use 
so that you can make an informed decision. I know there is a lot of information 
below but I want to make sure you choose the correct propeller to suit your 
sailing style/boat use.

I personally am looking at the Variprop Feathering or Gori Folding 
The Variprofile feathering propeller is a unique feathering propeller and the 
first to incorporate the hi-tec GAWN/KAPLAN profile. The only feathering 
propeller with a shaped blade which is 7-11% more efficient than the std flat 
bladed feathering propeller. This profile has been used primarily for high 
performance power boat applications, but also for rudder design and in the 
aircraft industry. 
 
Normally associated with high-speed power boat and aircraft propeller blades 
the Gawn/Kaplan blade profile & slim hub delivers very low drag, excellent 
Hydro-dynamics while running extremely more quietly and efficiently under power 
than other propellers with the result that the VariProfile delivers speed 
normally associated with fixed propellers or the best folding propellers in 
both fwd. & reverse with its continuous independently variable adjustable 
external pitch control (patented). Forward and Reverse pitches can be changed 
independently in just seconds, even underwater.

The Gori is a folding propeller with two(2) pitches in fwd & full 100% reverse 
thrust, no prop walk. The Gori does not auto-rotate/spin under sail as does a 
feathering propeller at higher speeds, or have one blade drop down and increase 
drag or not open when coming into the slip.
 
The drag for the Gori 3-blade propellers is the lowest of any fixed, feathering 
or folding propellers (even less than any 2-blade) giving increased sailing 
speeds & less turbulence over the rudder, enabling you to point higher.  The 
unique folding design prevents seaweed etc from fouling on the propeller giving 
increased speed potential. You will see an increase in sailing speeds over your 
fixed 3-blade propeller. The drag reduction will amount to 0.95 + of a knot for 
a 36 footer. 

The blades of the Gori propeller are designed with both camber, curve & twist 
to them, which gives increased efficiency (thrust) throughout the rpm range, 
which will always give you better motoring performance (speed/thrust), 
especially in heavy seas, or when motor sailing with the "Overdrive" Function. 
The Gori 3-blade "Overdrive" function, by increasing the blade pitch angle, 
gives increased thrust and speed - at the same rpm or when motoring sailing, or 
the same boat speed at much lower rpms.  The result is less engine noise, less 
vibration, increased fuel economy & therefore a greater cruising range. 
The Gori 3-blade propeller is the only propeller that will give you exactly the 
same performance in reverse as in forward due to the unique blade folding 
action of presenting the identical leading edge in reverse as in forward - 
resulting in no 'prop walk'. See http://ab-marine.com/folding/gori/ & 
http://gori-propeller.com/

Rodney Meryweather


___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Help with folding prop insights?

[Rick Brass via CnC-List]

Bruce;

 

My 38, Imzadi, came with a 16x10 ½ RH Martec prop when I bought her in 2003.
16x10 ½ was the prop recommended for my 15,000lb boat with a 36hp engine and
whatever gear reduction I have. I was quite pleased with the performance. It
would get hull speed (about 7.2 kn) at 2400 RPM and reach 3000 in a pinch.
It took me a month or two to learn the trick to reverse: Hit the throttle
high to unfold the prop (with moderate forward speed and moderate throttle,
the flow of water keeps the prop partly closed… so performance sucks), once
the boat is moving aft fast enough for flow over the rudder you shift into
neutral and steer with the rudder. I’ve been backing into my slips for 14
years and have only hit the dock a couple of times. BTW, the prop does give
a fair amount of prop walk.

 

My prop must have been near the end of its third life, because after a
couple of years one of the “ears” in the hub broke and I had to replace the
prop with a 2 blade fixed prop of the  same diameter and pitch. I found that
I lost about ½ knot of boat speed when sailing in light to moderate winds.

 

I bought a used Martec that was 17x10 and had Martec refurb it. I was
greatly over propped, and could barely get to 2000RPM. Also had a vibration
because the prop tips were too close to the bottom of the boat, I think.

 

I replaced that Martec prop with a Gori geared prop: Their recommended prop
is a 16 ½ x10 was still overpropped because of the blade profile, and
frankly, after 3 years of use, I was more satisfied with the Martec. When I
discussed the overprop situation with them while the boat was being painted
last winter, they said that the 10 pitch was the lowest they had in the 16 ½
diameter, and going to a smaller diameter would involve getting a whole new
propeller. At their suggestion I had a local shop trim 1/2'” from the tip of
each blade. It is better, but still not as good as the Martec.

 

You mention that your prop is 18x12, which seems like a lot of prop
depending on your engine max RPM and HP, gear reduction, and boat weight.
Before you spend money on reconditioning the prop, you might want to ask
Martec what prop diameter and pitch they recommend for your boat.

 

Rick Brass

Washington, NC

 

 

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Bruce via
CnC-List
Sent: Thursday, February 15, 2018 8:28 PM
To: cnc-list@cnc-list.com
Cc: bwhitm...@sbcglobal.net
Subject: Stus-List Help with folding prop insights?

 

Hello all,

 

I have a fixed, 3 bladed prop on Astralis currently, and suspect that its
slowing us down here in Florida where we just don’t get the wind like we did
on Lake Michigan, so we rarely see much over 12 kts or so.  I’m thinking I’d
like to get a little more speed out of her, and one area of improvement
could be the fixed prop.  

 

In the pile of old parts that the prior owner left us, I found an old, and
obviously used Martec Eliptec RH18DX12P-3, two blade folding prop (it is not
geared).  I have the blades and hub, but at the moment cannot find the
center pin.  It seems like Martec may still be in the business of repairing
these props.

 

I’ve read some of the various reviews, and I understand there are better
solutions out there, but clearly I’d be dropping a few boat bucks to pull it
off.  

 

Do any of you have direct experience with the Martec Eliptec, and can advise
me whether I’ll hate this thing from a performance or vibration point of
view if I get a pin and put it on the boat?  

 

I am OK with somewhat limited reverse, but would be anxious if I was giving
up a lot of forward power.  And, I really don’t want a lot of vibration,
especially if it’s going to do things like tear up the cutlass bearing.  

 

Thanks for your insights!  

 

Bruce C. Whitmore

1994 C 37/40+, “Astralis”

Madeira Beach, FL

847.404.5092

bwhitm...@sbcglobal.net <mailto:bwhitm...@sbcglobal.net> 

 

___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Help with folding prop insights?

[Chuck S via CnC-List]

My two cents,

I had the Martec Folding Eliptic on our boat from 2002 to 2007. I had a few 
close calls when it wouldn't open. These may have been my inexperience with a 
large boat. It seemed like I needed to put it in reverse at four boat lengths 
from the dock to get it to stop reliably in my slip. I had many doubts about 
the folding prop at the time, but I've since learned better boathandling skills 
and learned to respect the design.

I did much research at the time and learned most racers use this prop because 
it has the least drag. My Martec prop was on it's last legs and well worn. To 
replace it, I chose a MaxProp two blade feathering prop. That was eleven years 
ago. I am happy with it, as it is quicker to deploy and stops quicker and the 
gearing maintains balance. I think it is more forgiving and reliable. I do 
align the coupling before a race so the blades are vertical, because of the 
angled shaft, that gives me the least drag. People who cruise more than race, 
buy the three blade version for better grip in bad weather. Our two blade (size 
determined by Pyacht) does lose grip in strong (twenty five knots plus) 
headwinds and boat speed suffers down to 5 or 4.5 knots.

I made blade alignment fairly easy on my 34R. I painted the coupling and 
transmission white, so you simply open the rear panel of the engine compartment 
and turn the coupling by hand until a black line on the coupling lines up with 
a black line on the transmission and the blades of the prop will be vertical. 
The friction of the wax seal holds it for the race or a long cruise.

In hindsight, if I had a healthy Martec Folding Eliptic, I would use it, and 
get the rebuilds, but when time came to replace it, I would probably do what I 
did before and get a geared feathering prop, especially if I planned to motor 
for long periods or cruise. The geared prop gives instant response but is 
slightly more drag and twice the cost, so maybe not for everyone.


> On February 16, 2018 at 1:25 PM Pierre Tremblay via CnC-List 
>  wrote:
> 
> I also have the original Martec Eliptic on my 38-3. No vibration, hull 
> speed at 2400 RPM, and in reverse, you have to think ahead. 
> 
> To align the blade, I installed a cheap fleabay car backup camera 
> connected to the video input of my chartplotter (Zeus Touch). With paint mark 
> on the tranny and cuppling, easy to align. It also give me view on the 
> engine, stuffing box and bilge when motoring for prolonged period.
> 
> 
> Pierre TremblayAvalanche #54988
> 
> C WK, hull #76
> 
> 
> 
> Le ‎vendredi‎, ‎16‎ ‎février‎ ‎2018‎ ‎11‎:‎53‎:‎09‎ ‎Est, Gary Russell 
> via CnC-List  a écrit :
> 
> 
> I have to provide the dissenting opinion on the Martec prop.  Many years 
> ago, I had to make a quick stop when two kids in a dinghy came out of a 
> mooring field in front of me.  In order not to hit them I slammed the boat in 
> reverse.  Being not  geared, one of the blades did not open.  The resulting 
> imbalance ( at full power) bent the shaft severely.  The resulting 1/2" run 
> out created incredible vibration.  The shaft and prop had to be removed for 
> repair.  I would never use a folding prop that isn't geared.  I currently use 
> a 3 blade Flex-O-Fold prop which has very good reviews and I'm happy with it.
> 
> Gary
> S/V Kaylarah
> '90 C 37+
> East Greenwich, RI, USA
> 
> ~~~_/)~~
> 
> 
> On Fri, Feb 16, 2018 at 9:54 AM, Dreuge via CnC-List 
>  wrote:
> 
> > > 
> > My LF38 came with a 2 blade Martec Eliptec (LH18DX14P-3 1-1/8), and 
> > I agree with others that the performance is surprising good.   Yes I often 
> > forget/neglect to align the blades, and I have experienced the boat shake 
> > on a rare occasions.  Performance wise, forward to hull speed is no problem 
> > in flat water, but like others, I cruise at about 6.5 with a lower rpm 
> > (Yanmar 3QM30/Paragon/Walter-Vee).  With regards to backing/stopping, I 
> > have not hit anything (harder than willing) yet. I do get some starboard 
> > prop walk which I try to take advantage of, but it is nothing compared to 
> > the walk of my old 29Mk1 w/ a fixed 2 bladed prop. 
> > 
> > 
> > -
> > Paul E.
> > 1981 C 38 Landfall 
> > S/V Johanna Rose
> > Fort Walton Beach, FL
> > 
> > http://svjohannarose.blogspot. com/ 
> > http://svjohannarose.blogspot.com/
> > 
> > 
> > > > > On Feb 15, 2018, at 10:32 PM, 
> > cnc-list-requ...@cnc-list.com mailto:cnc-list-requ...@cnc-list.com wrote:
> > > 
> > > My Martec runs very smoothly with a couple small harmonics at 
> > > different
> > > rpm's.  That's normal for nearly all drive trains.
> > > 
> > > Forward power is good.  I think my prop is a wee bit 
> > > underpitched.  I can
> > > get hull speed with a 

Re: Stus-List Help with folding prop insights?

[john sandford via CnC-List]

That is pretty/very smart.

Thinking outside the box.

I have wondered for a while on how to do the alignment without major cupboard 
removals to check the coupling.

You solved it.

This has been my major reason to stall on getting a folding prop.

Thank you

 

John

LF38

 

 

From: Pierre Tremblay [mailto:tremblay.pie...@yahoo.ca] 
Sent: February-16-18 2:25 PM
To: C List
Subject: Re: Stus-List Help with folding prop insights?

 

I also have the original Martec Eliptic on my 38-3. No vibration, hull speed at 
2400 RPM, and in reverse, you have to think ahead. 

 

To align the blade, I installed a cheap fleabay car backup camera connected to 
the video input of my chartplotter (Zeus Touch). With paint mark on the tranny 
and cuppling, easy to align. It also give me view on the engine, stuffing box 
and bilge when motoring for prolonged period.

 

Pierre TremblayAvalanche #54988

C WK, hull #76

 

 

Le ‎vendredi‎, ‎16‎ ‎février‎ ‎2018‎ ‎11‎:‎53‎:‎09‎ ‎Est, Gary Russell via 
CnC-List <cnc-list@cnc-list.com> a écrit : 

 

 

I have to provide the dissenting opinion on the Martec prop.  Many years ago, I 
had to make a quick stop when two kids in a dinghy came out of a mooring field 
in front of me.  In order not to hit them I slammed the boat in reverse.  Being 
not  geared, one of the blades did not open.  The resulting imbalance ( at full 
power) bent the shaft severely.  The resulting 1/2" run out created incredible 
vibration.  The shaft and prop had to be removed for repair.  I would never use 
a folding prop that isn't geared.  I currently use a 3 blade Flex-O-Fold prop 
which has very good reviews and I'm happy with it.

 

Gary

S/V Kaylarah

'90 C 37+

East Greenwich, RI, USA




~~~_/)~~

 

On Fri, Feb 16, 2018 at 9:54 AM, Dreuge via CnC-List <cnc-list@cnc-list.com> 
wrote:

 

My LF38 came with a 2 blade Martec Eliptec (LH18DX14P-3 1-1/8), and I agree 
with others that the performance is surprising good.   Yes I often 
forget/neglect to align the blades, and I have experienced the boat shake on a 
rare occasions.  Performance wise, forward to hull speed is no problem in flat 
water, but like others, I cruise at about 6.5 with a lower rpm (Yanmar 
3QM30/Paragon/Walter-Vee).  With regards to backing/stopping, I have not hit 
anything (harder than willing) yet. I do get some starboard prop walk which I 
try to take advantage of, but it is nothing compared to the walk of my old 
29Mk1 w/ a fixed 2 bladed prop. 

 

 

-
Paul E.

1981 C 38 Landfall 
S/V Johanna Rose
Fort Walton Beach, FL

 

http://svjohannarose.blogspot. <http://svjohannarose.blogspot.com/>  com/





On Feb 15, 2018, at 10:32 PM, cnc-list-requ...@cnc-list.com wrote:

 

My Martec runs very smoothly with a couple small harmonics at different
rpm's.  That's normal for nearly all drive trains.

Forward power is good.  I think my prop is a wee bit underpitched.  I can
get hull speed with a clean bottom and max rpm but only 6.4-6.5 at cruise
rpm (80% max).

I really haven't had any issue with opening, closing, etc.  I think the
Martec is a good choice for folks who race and want minimal drag.  If my
use was only cruising, I'd probably have a different prop.

Dennis C.

 


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every one is greatly appreciated.  If you want to support the list - use PayPal 
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<https://www.paypal.me/stumurray>  stumurray



 

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Re: Stus-List Help with folding prop insights?

[Pierre Tremblay via CnC-List]

I also have the original Martec Eliptic on my 38-3. No vibration, hull speed at 
2400 RPM, and in reverse, you have to think ahead. 
To align the blade, I installed a cheap fleabay car backup camera connected to 
the video input of my chartplotter (Zeus Touch). With paint mark on the tranny 
and cuppling, easy to align. It also give me view on the engine, stuffing box 
and bilge when motoring for prolonged period.


Pierre TremblayAvalanche #54988

C WK, hull #76
 

Le ‎vendredi‎, ‎16‎ ‎février‎ ‎2018‎ ‎11‎:‎53‎:‎09‎ ‎Est, Gary Russell via 
CnC-List  a écrit :  
 
 I have to provide the dissenting opinion on the Martec prop.  Many years ago, 
I had to make a quick stop when two kids in a dinghy came out of a mooring 
field in front of me.  In order not to hit them I slammed the boat in reverse.  
Being not  geared, one of the blades did not open.  The resulting imbalance ( 
at full power) bent the shaft severely.  The resulting 1/2" run out created 
incredible vibration.  The shaft and prop had to be removed for repair.  I 
would never use a folding prop that isn't geared.  I currently use a 3 blade 
Flex-O-Fold prop which has very good reviews and I'm happy with it.
GaryS/V Kaylarah'90 C 37+East Greenwich, RI, USA
~~~_/)~~


On Fri, Feb 16, 2018 at 9:54 AM, Dreuge via CnC-List  
wrote:


My LF38 came with a 2 blade Martec Eliptec (LH18DX14P-3 1-1/8), and I agree 
with others that the performance is surprising good.   Yes I often 
forget/neglect to align the blades, and I have experienced the boat shake on a 
rare occasions.  Performance wise, forward to hull speed is no problem in flat 
water, but like others, I cruise at about 6.5 with a lower rpm (Yanmar 
3QM30/Paragon/Walter-Vee).  With regards to backing/stopping, I have not hit 
anything (harder than willing) yet. I do get some starboard prop walk which I 
try to take advantage of, but it is nothing compared to the walk of my old 
29Mk1 w/ a fixed 2 bladed prop. 

-
Paul E.1981 C 38 Landfall 
S/V Johanna Rose
Fort Walton Beach, FL
http://svjohannarose.blogspot. com/

On Feb 15, 2018, at 10:32 PM, cnc-list-requ...@cnc-list.com wrote:
My Martec runs very smoothly with a couple small harmonics at different
rpm's.  That's normal for nearly all drive trains.

Forward power is good.  I think my prop is a wee bit underpitched.  I can
get hull speed with a clean bottom and max rpm but only 6.4-6.5 at cruise
rpm (80% max).

I really haven't had any issue with opening, closing, etc.  I think the
Martec is a good choice for folks who race and want minimal drag.  If my
use was only cruising, I'd probably have a different prop.

Dennis C.



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every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/ stumurray




___

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Re: Stus-List Help with folding prop insights?

[Bruce via CnC-List]

Gary, that is good, hands-on, experienced insight.  

 

Thank you!

 

Bruce C. Whitmore

1994 C 37/40+, “Astralis”

Madeira Beach, FL

847.404.5092

bwhitm...@sbcglobal.net

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Gary Russell 
via CnC-List
Sent: Friday, February 16, 2018 11:52 AM
To: C List <cnc-list@cnc-list.com>
Cc: Gary Russell <captnga...@gmail.com>
Subject: Re: Stus-List Help with folding prop insights?

 

I have to provide the dissenting opinion on the Martec prop.  Many years ago, I 
had to make a quick stop when two kids in a dinghy came out of a mooring field 
in front of me.  In order not to hit them I slammed the boat in reverse.  Being 
not  geared, one of the blades did not open.  The resulting imbalance ( at full 
power) bent the shaft severely.  The resulting 1/2" run out created incredible 
vibration.  The shaft and prop had to be removed for repair.  I would never use 
a folding prop that isn't geared.  I currently use a 3 blade Flex-O-Fold prop 
which has very good reviews and I'm happy with it.

 

Gary

S/V Kaylarah

'90 C 37+

East Greenwich, RI, USA




~~~_/)~~

 

On Fri, Feb 16, 2018 at 9:54 AM, Dreuge via CnC-List <cnc-list@cnc-list.com 
<mailto:cnc-list@cnc-list.com> > wrote:

 

My LF38 came with a 2 blade Martec Eliptec (LH18DX14P-3 1-1/8), and I agree 
with others that the performance is surprising good.   Yes I often 
forget/neglect to align the blades, and I have experienced the boat shake on a 
rare occasions.  Performance wise, forward to hull speed is no problem in flat 
water, but like others, I cruise at about 6.5 with a lower rpm (Yanmar 
3QM30/Paragon/Walter-Vee).  With regards to backing/stopping, I have not hit 
anything (harder than willing) yet. I do get some starboard prop walk which I 
try to take advantage of, but it is nothing compared to the walk of my old 
29Mk1 w/ a fixed 2 bladed prop. 

 

 

-
Paul E.

1981 C 38 Landfall 
S/V Johanna Rose
Fort Walton Beach, FL

 

http://svjohannarose.blogspot.com/





On Feb 15, 2018, at 10:32 PM, cnc-list-requ...@cnc-list.com 
<mailto:cnc-list-requ...@cnc-list.com>  wrote:

 

My Martec runs very smoothly with a couple small harmonics at different
rpm's.  That's normal for nearly all drive trains.

Forward power is good.  I think my prop is a wee bit underpitched.  I can
get hull speed with a clean bottom and max rpm but only 6.4-6.5 at cruise
rpm (80% max).

I really haven't had any issue with opening, closing, etc.  I think the
Martec is a good choice for folks who race and want minimal drag.  If my
use was only cruising, I'd probably have a different prop.

Dennis C.

 


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every one is greatly appreciated.  If you want to support the list - use PayPal 
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Re: Stus-List Help with folding prop insights?

[Gary Russell via CnC-List]

I have to provide the dissenting opinion on the Martec prop.  Many years
ago, I had to make a quick stop when two kids in a dinghy came out of a
mooring field in front of me.  In order not to hit them I slammed the boat
in reverse.  Being not  geared, one of the blades did not open.  The
resulting imbalance ( at full power) bent the shaft severely.  The
resulting 1/2" run out created incredible vibration.  The shaft and prop
had to be removed for repair.  I would never use a folding prop that isn't
geared.  I currently use a 3 blade Flex-O-Fold prop which has very good
reviews and I'm happy with it.

Gary
S/V Kaylarah
'90 C 37+
East Greenwich, RI, USA

~~~_/)~~


On Fri, Feb 16, 2018 at 9:54 AM, Dreuge via CnC-List 
wrote:

>
> My LF38 came with a 2 blade Martec Eliptec (LH18DX14P-3 1-1/8), and I
> agree with others that the performance is surprising good.   Yes I often
> forget/neglect to align the blades, and I have experienced the boat shake
> on a rare occasions.  Performance wise, forward to hull speed is no problem
> in flat water, but like others, I cruise at about 6.5 with a lower rpm
> (Yanmar 3QM30/Paragon/Walter-Vee).  With regards to backing/stopping, I
> have not hit anything (harder than willing) yet. I do get some starboard
> prop walk which I try to take advantage of, but it is nothing compared to
> the walk of my old 29Mk1 w/ a fixed 2 bladed prop.
>
>
> -
> Paul E.
> 1981 C 38 Landfall
> S/V Johanna Rose
> Fort Walton Beach, FL
>
> http://svjohannarose.blogspot.com/
>
> On Feb 15, 2018, at 10:32 PM, cnc-list-requ...@cnc-list.com wrote:
>
> My Martec runs very smoothly with a couple small harmonics at different
> rpm's.  That's normal for nearly all drive trains.
>
> Forward power is good.  I think my prop is a wee bit underpitched.  I can
> get hull speed with a clean bottom and max rpm but only 6.4-6.5 at cruise
> rpm (80% max).
>
> I really haven't had any issue with opening, closing, etc.  I think the
> Martec is a good choice for folks who race and want minimal drag.  If my
> use was only cruising, I'd probably have a different prop.
>
> Dennis C.
>
>
>
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
>
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every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Help with folding prop insights?

[Dreuge via CnC-List]

My LF38 came with a 2 blade Martec Eliptec (LH18DX14P-3 1-1/8), and I agree 
with others that the performance is surprising good.   Yes I often 
forget/neglect to align the blades, and I have experienced the boat shake on a 
rare occasions.  Performance wise, forward to hull speed is no problem in flat 
water, but like others, I cruise at about 6.5 with a lower rpm (Yanmar 
3QM30/Paragon/Walter-Vee).  With regards to backing/stopping, I have not hit 
anything (harder than willing) yet. I do get some starboard prop walk which I 
try to take advantage of, but it is nothing compared to the walk of my old 
29Mk1 w/ a fixed 2 bladed prop. 


-
Paul E.
1981 C 38 Landfall 
S/V Johanna Rose
Fort Walton Beach, FL

http://svjohannarose.blogspot.com/

> On Feb 15, 2018, at 10:32 PM, cnc-list-requ...@cnc-list.com wrote:
> 
> My Martec runs very smoothly with a couple small harmonics at different
> rpm's.  That's normal for nearly all drive trains.
> 
> Forward power is good.  I think my prop is a wee bit underpitched.  I can
> get hull speed with a clean bottom and max rpm but only 6.4-6.5 at cruise
> rpm (80% max).
> 
> I really haven't had any issue with opening, closing, etc.  I think the
> Martec is a good choice for folks who race and want minimal drag.  If my
> use was only cruising, I'd probably have a different prop.
> 
> Dennis C.

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Re: Stus-List Help with folding prop insights?

[Matthew L. Wolford via CnC-List]

FWIW, I finally bit the bullet last year and went to a geared 2-blade 
Flex-o-fold.  The power (forward and reverse) seems to be about the same.  I 
suspect that when it’s folded, the drag is comparable to the old 2-blade Martec 
folding prop when we remembered to align it.  Significant differences are: 1) 
we no longer need to remember to align the prop; and 2) if (when) we forget, we 
don’t run the risk of the increased drag of one blade hanging down; and 3) I no 
longer experience the “boat shake” when I put the engine in gear and only one 
blade opens up.  Anyone with an older Martec knows what I’m talking about.

Overall, I’m pleased with this upgrade.

From: Dave Godwin via CnC-List 
Sent: Friday, February 16, 2018 7:08 AM
To: Chuck Gilchrest via CnC-List 
Cc: Dave Godwin 
Subject: Re: Stus-List Help with folding prop insights?

Bruce, 

For reasons that have been lost in distant memory I have a new pin for an 
original Martec, non-geared, two-blade elliptical. Don’t know the size or if it 
will fit your model but if I can find it (that’s the hard part…) it’s yours.

Because I sent ours back to Martec for refurbishment years ago and they told me 
that it non-repairable in the future (must be on its 3rd life…) I will be 
replacing it when my “hobby” is ready to go back into the water.

I am in full alignment with Dennis. I love the two-blade folding prop. Forward 
gave me all the push I needed and once you figure out the necessity of getting 
the blades fully opened in reverse it was easy to back down.

I plan on replacing it with something similar.

Best,

Dave Godwin
1982 C 37 - Ronin
Reedville - Chesapeake Bay
Ronin’s Overdue Refit


  On Feb 15, 2018, at 9:27 PM, Bruce via CnC-List <cnc-list@cnc-list.com> wrote:

  Well, thankfully (or not) I found the pin, which is a good thing, except that 
it was clearly broken during the removal process.  At least I have something to 
measure.  The pin is really pretty tight in one blade, but a little sloppy on 
the other, so yes, it will need to be refurbished.  
   
  Interestingly, I can get to my prop shaft very easily by removing an 
inspection panel in the cabin sole, so aligning the prop  will be no big deal 
at all.
   
  How do you feel about vibration (presumably the refurbishment would take care 
of a lot of the potential problems) and forward power?
   
  Kindest Regards,
   
  Bruce C. Whitmore
  1994 C 37/40+, “Astralis”
  Madeira Beach, FL
  847.404.5092
  bwhitm...@sbcglobal.net
   
  From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dennis C. 
via CnC-List
  Sent: Thursday, February 15, 2018 9:02 PM
  To: CnClist <cnc-list@cnc-list.com>
  Cc: Dennis C. <capt...@gmail.com>
  Subject: Re: Stus-List Help with folding prop insights?
   
  Bruce,
   
  You're not going to get a lot of positive comments about Martec props on this 
list.  You'll get a lot of suggestions about this prop and that prop.
   
  Having said that, I have a Martec Elliptical on Touche'.  While it might not 
be everyone's favorite, I don't have any problems with it.  Sure, I have to 
drop down into a cockpit locker to align it before a race or a long sail but 
that's the nature of non-geared folding props.
   
  As for rev erse, I back into my home slip without any issue at all.  Just 
need a bit of practice and anticipation and you'll be good to go (or back up).
   
  I've dealt with Martec a couple times and found them to be fairly responsive. 
 They should be able to send you whatever parts you need.  
   
  One thing to be aware of with Martec props.  They have 3 "lives".  With use, 
the pin holes in the blades will begin to wallow out and the blades will start 
to become loose on the pin.  The fix is to return the prop to Martec where they 
will, for a price, recondition it.  Part of the reconditioning process is to 
re-bore the hub and blades for a larger pin.  You can only do this twice.  
Hence the 3 lives, the original life plus 2 rebuilds.
   
  So, before you send the prop to Martec for reconditioning, measure the pin 
diameter and call them to see how many lives it has left.
   
  Dennis C.
  Touche' 35-1 #83
  Mandeville, LA
   
  On Thu, Feb 15, 2018 at 7:28 PM, Bruce via CnC-List <cnc-list@cnc-list.com> 
wrote:




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Re: Stus-List Help with folding prop insights?

[Dave Godwin via CnC-List]

Bruce,

For reasons that have been lost in distant memory I have a new pin for an 
original Martec, non-geared, two-blade elliptical. Don’t know the size or if it 
will fit your model but if I can find it (that’s the hard part…) it’s yours.

Because I sent ours back to Martec for refurbishment years ago and they told me 
that it non-repairable in the future (must be on its 3rd life…) I will be 
replacing it when my “hobby” is ready to go back into the water.

I am in full alignment with Dennis. I love the two-blade folding prop. Forward 
gave me all the push I needed and once you figure out the necessity of getting 
the blades fully opened in reverse it was easy to back down.

I plan on replacing it with something similar.

Best,
Dave Godwin
1982 C 37 - Ronin
Reedville - Chesapeake Bay
Ronin’s Overdue Refit <http://roninrebuild.blogspot.com/>

> On Feb 15, 2018, at 9:27 PM, Bruce via CnC-List <cnc-list@cnc-list.com> wrote:
> 
> Well, thankfully (or not) I found the pin, which is a good thing, except that 
> it was clearly broken during the removal process.  At least I have something 
> to measure.  The pin is really pretty tight in one blade, but a little sloppy 
> on the other, so yes, it will need to be refurbished.  
>  
> Interestingly, I can get to my prop shaft very easily by removing an 
> inspection panel in the cabin sole, so aligning the prop  will be no big deal 
> at all.
>  
> How do you feel about vibration (presumably the refurbishment would take care 
> of a lot of the potential problems) and forward power?
>  
> Kindest Regards,
>  
> Bruce C. Whitmore
> 1994 C 37/40+, “Astralis”
> Madeira Beach, FL
> 847.404.5092
> bwhitm...@sbcglobal.net <mailto:bwhitm...@sbcglobal.net>
>  
> From: CnC-List [mailto:cnc-list-boun...@cnc-list.com 
> <mailto:cnc-list-boun...@cnc-list.com>] On Behalf Of Dennis C. via CnC-List
> Sent: Thursday, February 15, 2018 9:02 PM
> To: CnClist <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>>
> Cc: Dennis C. <capt...@gmail.com <mailto:capt...@gmail.com>>
> Subject: Re: Stus-List Help with folding prop insights?
>  
> Bruce,
>  
> You're not going to get a lot of positive comments about Martec props on this 
> list.  You'll get a lot of suggestions about this prop and that prop.
>  
> Having said that, I have a Martec Elliptical on Touche'.  While it might not 
> be everyone's favorite, I don't have any problems with it.  Sure, I have to 
> drop down into a cockpit locker to align it before a race or a long sail but 
> that's the nature of non-geared folding props.
>  
> As for rev erse, I back into my home slip without any issue at all.  Just 
> need a bit of practice and anticipation and you'll be good to go (or back up).
>  
> I've dealt with Martec a couple times and found them to be fairly responsive. 
>  They should be able to send you whatever parts you need.  
>  
> One thing to be aware of with Martec props.  They have 3 "lives".  With use, 
> the pin holes in the blades will begin to wallow out and the blades will 
> start to become loose on the pin.  The fix is to return the prop to Martec 
> where they will, for a price, recondition it.  Part of the reconditioning 
> process is to re-bore the hub and blades for a larger pin.  You can only do 
> this twice.  Hence the 3 lives, the original life plus 2 rebuilds.
>  
> So, before you send the prop to Martec for reconditioning, measure the pin 
> diameter and call them to see how many lives it has left.
>  
> Dennis C.
> Touche' 35-1 #83
> Mandeville, LA
>  
> On Thu, Feb 15, 2018 at 7:28 PM, Bruce via CnC-List <cnc-list@cnc-list.com 
> <mailto:cnc-list@cnc-list.com>> wrote:

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every one is greatly appreciated.  If you want to support the list - use PayPal 
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Re: Stus-List Help with folding prop insights?

[Dennis C. via CnC-List]

My Martec runs very smoothly with a couple small harmonics at different
rpm's.  That's normal for nearly all drive trains.

Forward power is good.  I think my prop is a wee bit underpitched.  I can
get hull speed with a clean bottom and max rpm but only 6.4-6.5 at cruise
rpm (80% max).

I really haven't had any issue with opening, closing, etc.  I think the
Martec is a good choice for folks who race and want minimal drag.  If my
use was only cruising, I'd probably have a different prop.

Dennis C.

On Thu, Feb 15, 2018 at 8:27 PM, Bruce via CnC-List <cnc-list@cnc-list.com>
wrote:

> Well, thankfully (or not) I found the pin, which is a good thing, except
> that it was clearly broken during the removal process.  At least I have
> something to measure.  The pin is really pretty tight in one blade, but a
> little sloppy on the other, so yes, it will need to be refurbished.
>
>
>
> Interestingly, I can get to my prop shaft very easily by removing an
> inspection panel in the cabin sole, so aligning the prop  will be no big
> deal at all.
>
>
>
> How do you feel about vibration (presumably the refurbishment would take
> care of a lot of the potential problems) and forward power?
>
>
>
> Kindest Regards,
>
>
>
> Bruce C. Whitmore
>
> 1994 C 37/40+, “Astralis”
>
> Madeira Beach, FL
>
> 847.404.5092 <(847)%20404-5092>
>
> bwhitm...@sbcglobal.net
>
>
>
> *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of *Dennis
> C. via CnC-List
> *Sent:* Thursday, February 15, 2018 9:02 PM
> *To:* CnClist <cnc-list@cnc-list.com>
> *Cc:* Dennis C. <capt...@gmail.com>
> *Subject:* Re: Stus-List Help with folding prop insights?
>
>
>
> Bruce,
>
>
>
> You're not going to get a lot of positive comments about Martec props on
> this list.  You'll get a lot of suggestions about this prop and that prop.
>
>
>
> Having said that, I have a Martec Elliptical on Touche'.  While it might
> not be everyone's favorite, I don't have any problems with it.  Sure, I
> have to drop down into a cockpit locker to align it before a race or a long
> sail but that's the nature of non-geared folding props.
>
>
>
> As for rev erse, I back into my home slip without any issue at all.  Just
> need a bit of practice and anticipation and you'll be good to go (or back
> up).
>
>
>
> I've dealt with Martec a couple times and found them to be fairly
> responsive.  They should be able to send you whatever parts you need.
>
>
>
> One thing to be aware of with Martec props.  They have 3 "lives".  With
> use, the pin holes in the blades will begin to wallow out and the blades
> will start to become loose on the pin.  The fix is to return the prop to
> Martec where they will, for a price, recondition it.  Part of the
> reconditioning process is to re-bore the hub and blades for a larger pin.
> You can only do this twice.  Hence the 3 lives, the original life plus 2
> rebuilds.
>
>
>
> So, before you send the prop to Martec for reconditioning, measure the pin
> diameter and call them to see how many lives it has left.
>
>
>
> Dennis C.
>
> Touche' 35-1 #83
>
> Mandeville, LA
>
>
>
> On Thu, Feb 15, 2018 at 7:28 PM, Bruce via CnC-List <cnc-list@cnc-list.com>
> wrote:
>
> Hello all,
>
>
>
> I have a fixed, 3 bladed prop on Astralis currently, and suspect that its
> slowing us down here in Florida where we just don’t get the wind like we
> did on Lake Michigan, so we rarely see much over 12 kts or so.  I’m
> thinking I’d like to get a little more speed out of her, and one area of
> improvement could be the fixed prop.
>
>
>
> In the pile of old parts that the prior owner left us, I found an old, and
> obviously used Martec Eliptec RH18DX12P-3, two blade folding prop (it is
> not geared).  I have the blades and hub, but at the moment cannot find the
> center pin.  It seems like Martec may still be in the business of repairing
> these props.
>
>
>
> I’ve read some of the various reviews, and I understand there are better
> solutions out there, but clearly I’d be dropping a few boat bucks to pull
> it off.
>
>
>
> Do any of you have direct experience with the Martec Eliptec, and can
> advise me whether I’ll hate this thing from a performance or vibration
> point of view if I get a pin and put it on the boat?
>
>
>
> I am OK with somewhat limited reverse, but would be anxious if I was
> giving up a lot of forward power.  And, I really don’t want a lot of
> vibration, especially if it’s going to do things like tear up the cutlass
> bearing.
>
>
>
> Thanks for your insights!
>
>
>
> Bruce C. Whitmore
&g

Re: Stus-List Help with folding prop insights?

[Bruce via CnC-List]

Well, thankfully (or not) I found the pin, which is a good thing, except that 
it was clearly broken during the removal process.  At least I have something to 
measure.  The pin is really pretty tight in one blade, but a little sloppy on 
the other, so yes, it will need to be refurbished.  

 

Interestingly, I can get to my prop shaft very easily by removing an inspection 
panel in the cabin sole, so aligning the prop  will be no big deal at all.

 

How do you feel about vibration (presumably the refurbishment would take care 
of a lot of the potential problems) and forward power?

 

Kindest Regards,

 

Bruce C. Whitmore

1994 C 37/40+, “Astralis”

Madeira Beach, FL

847.404.5092

bwhitm...@sbcglobal.net

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dennis C. 
via CnC-List
Sent: Thursday, February 15, 2018 9:02 PM
To: CnClist <cnc-list@cnc-list.com>
Cc: Dennis C. <capt...@gmail.com>
Subject: Re: Stus-List Help with folding prop insights?

 

Bruce,

 

You're not going to get a lot of positive comments about Martec props on this 
list.  You'll get a lot of suggestions about this prop and that prop.

 

Having said that, I have a Martec Elliptical on Touche'.  While it might not be 
everyone's favorite, I don't have any problems with it.  Sure, I have to drop 
down into a cockpit locker to align it before a race or a long sail but that's 
the nature of non-geared folding props.

 

As for rev erse, I back into my home slip without any issue at all.  Just need 
a bit of practice and anticipation and you'll be good to go (or back up).

 

I've dealt with Martec a couple times and found them to be fairly responsive.  
They should be able to send you whatever parts you need.  

 

One thing to be aware of with Martec props.  They have 3 "lives".  With use, 
the pin holes in the blades will begin to wallow out and the blades will start 
to become loose on the pin.  The fix is to return the prop to Martec where they 
will, for a price, recondition it.  Part of the reconditioning process is to 
re-bore the hub and blades for a larger pin.  You can only do this twice.  
Hence the 3 lives, the original life plus 2 rebuilds.

 

So, before you send the prop to Martec for reconditioning, measure the pin 
diameter and call them to see how many lives it has left.

 

Dennis C.

Touche' 35-1 #83

Mandeville, LA

 

On Thu, Feb 15, 2018 at 7:28 PM, Bruce via CnC-List <cnc-list@cnc-list.com 
<mailto:cnc-list@cnc-list.com> > wrote:

Hello all,

 

I have a fixed, 3 bladed prop on Astralis currently, and suspect that its 
slowing us down here in Florida where we just don’t get the wind like we did on 
Lake Michigan, so we rarely see much over 12 kts or so.  I’m thinking I’d like 
to get a little more speed out of her, and one area of improvement could be the 
fixed prop.  

 

In the pile of old parts that the prior owner left us, I found an old, and 
obviously used Martec Eliptec RH18DX12P-3, two blade folding prop (it is not 
geared).  I have the blades and hub, but at the moment cannot find the center 
pin.  It seems like Martec may still be in the business of repairing these 
props.

 

I’ve read some of the various reviews, and I understand there are better 
solutions out there, but clearly I’d be dropping a few boat bucks to pull it 
off.  

 

Do any of you have direct experience with the Martec Eliptec, and can advise me 
whether I’ll hate this thing from a performance or vibration point of view if I 
get a pin and put it on the boat?  

 

I am OK with somewhat limited reverse, but would be anxious if I was giving up 
a lot of forward power.  And, I really don’t want a lot of vibration, 
especially if it’s going to do things like tear up the cutlass bearing.  

 

Thanks for your insights!  

 

Bruce C. Whitmore

1994 C 37/40+, “Astralis”

Madeira Beach, FL

847.404.5092 <tel:(847)%20404-5092> 

bwhitm...@sbcglobal.net <mailto:bwhitm...@sbcglobal.net> 

 


___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray



 

___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Help with folding prop insights?

[Dennis C. via CnC-List]

Bruce,

You're not going to get a lot of positive comments about Martec props on
this list.  You'll get a lot of suggestions about this prop and that prop.

Having said that, I have a Martec Elliptical on Touche'.  While it might
not be everyone's favorite, I don't have any problems with it.  Sure, I
have to drop down into a cockpit locker to align it before a race or a long
sail but that's the nature of non-geared folding props.

As for rev erse, I back into my home slip without any issue at all.  Just
need a bit of practice and anticipation and you'll be good to go (or back
up).

I've dealt with Martec a couple times and found them to be fairly
responsive.  They should be able to send you whatever parts you need.

One thing to be aware of with Martec props.  They have 3 "lives".  With
use, the pin holes in the blades will begin to wallow out and the blades
will start to become loose on the pin.  The fix is to return the prop to
Martec where they will, for a price, recondition it.  Part of the
reconditioning process is to re-bore the hub and blades for a larger pin.
You can only do this twice.  Hence the 3 lives, the original life plus 2
rebuilds.

So, before you send the prop to Martec for reconditioning, measure the pin
diameter and call them to see how many lives it has left.

Dennis C.
Touche' 35-1 #83
Mandeville, LA

On Thu, Feb 15, 2018 at 7:28 PM, Bruce via CnC-List 
wrote:

> Hello all,
>
>
>
> I have a fixed, 3 bladed prop on Astralis currently, and suspect that its
> slowing us down here in Florida where we just don’t get the wind like we
> did on Lake Michigan, so we rarely see much over 12 kts or so.  I’m
> thinking I’d like to get a little more speed out of her, and one area of
> improvement could be the fixed prop.
>
>
>
> In the pile of old parts that the prior owner left us, I found an old, and
> obviously used Martec Eliptec RH18DX12P-3, two blade folding prop (it is
> not geared).  I have the blades and hub, but at the moment cannot find the
> center pin.  It seems like Martec may still be in the business of repairing
> these props.
>
>
>
> I’ve read some of the various reviews, and I understand there are better
> solutions out there, but clearly I’d be dropping a few boat bucks to pull
> it off.
>
>
>
> Do any of you have direct experience with the Martec Eliptec, and can
> advise me whether I’ll hate this thing from a performance or vibration
> point of view if I get a pin and put it on the boat?
>
>
>
> I am OK with somewhat limited reverse, but would be anxious if I was
> giving up a lot of forward power.  And, I really don’t want a lot of
> vibration, especially if it’s going to do things like tear up the cutlass
> bearing.
>
>
>
> Thanks for your insights!
>
>
>
> Bruce C. Whitmore
>
> 1994 C 37/40+, “Astralis”
>
> Madeira Beach, FL
>
> 847.404.5092 <(847)%20404-5092>
>
> bwhitm...@sbcglobal.net
>
>
>
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
>
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Stus-List Help with folding prop insights?

[Bruce via CnC-List]

Hello all,

 

I have a fixed, 3 bladed prop on Astralis currently, and suspect that its
slowing us down here in Florida where we just don't get the wind like we did
on Lake Michigan, so we rarely see much over 12 kts or so.  I'm thinking I'd
like to get a little more speed out of her, and one area of improvement
could be the fixed prop.  

 

In the pile of old parts that the prior owner left us, I found an old, and
obviously used Martec Eliptec RH18DX12P-3, two blade folding prop (it is not
geared).  I have the blades and hub, but at the moment cannot find the
center pin.  It seems like Martec may still be in the business of repairing
these props.

 

I've read some of the various reviews, and I understand there are better
solutions out there, but clearly I'd be dropping a few boat bucks to pull it
off.  

 

Do any of you have direct experience with the Martec Eliptec, and can advise
me whether I'll hate this thing from a performance or vibration point of
view if I get a pin and put it on the boat?  

 

I am OK with somewhat limited reverse, but would be anxious if I was giving
up a lot of forward power.  And, I really don't want a lot of vibration,
especially if it's going to do things like tear up the cutlass bearing.  

 

Thanks for your insights!  

 

Bruce C. Whitmore

1994 C 37/40+, "Astralis"

Madeira Beach, FL

847.404.5092

bwhitm...@sbcglobal.net

 

___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray