KR> Ivoprop?

[Darren Crompton]

>
>
> Orma used to have a rant page about how the Ivo failed on his plane and how
> badly he was treated by the company following the prop failure, but the web
> page is now gone.
>
>
I think this might be the page.

http://kr-2.aviation-mechanics.com/AlertIVOProp.htm



-- 
Darren Crompton
AUSTRALIA

My web site: www.kr-2s.com

KR> Ivoprop?

[Dj Merrill]

On 06/01/2009 10:40 AM, Jeff Scott wrote:
> You guys need to take advantage of the past writings in the KRNet archive on 
> this subject.  The Ivo props have been tested on the VWs and found to be a 
> failure with a lousy company that won't stand behind them.  

Interesting.  I'm on a Subaru list, and there are people flying with
an IVO (the Magnum model) that have several hundred hours on them and
really like them.  That is on a geared Subaru, so not the same as a
direct drive VW. 

I found this Service Bulletin on the IVO site that addresses prop
blades on their ultralight model:


-Dj

KR> Ivoprop?

[Scott Perkins]

Doesnt IvoProp specificly prohibit use of their props in
direct drive 4 stroke applications ?  Why even pursue it.
Scott


Jeff Scott wrote:
> 
> You guys need to take advantage of the past writings in the KRNet archive on 
> this subject.  The Ivo props have been tested on the VWs and found to be a 
> failure with a lousy company that won't stand behind them.  Orma Robbins is a 
> long time A/IA/KR builder/pilot with a ton of experience.  I would suggest 
> that you get into the "way back" machine called the KRNet Archives (listed at 
> the bottom of every KRNet email) and do a search for posts from 
> "o...@aviation-mechanics.com" for 2004 with a key word of "Ivo".  I think 
> you'll find all the information you need on Ivo.
> 
> Orma used to have a rant page about how the Ivo failed on his plane and how 
> badly he was treated by the company following the prop failure, but the web 
> page is now gone.
> 
> Almost any subject you guys come up with has been discussed at length in the 
> archives, which is why you don't get a lot of comments from guys that have 
> been there and done that before.  If you're question was serious, you would 
> look in the archives for an answer before posting.
> 
> -Jeff Scott
> Los Alamos, NM
> 
> 
> Learning Centers - Click Here.
> http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTKNdOKf8wNNzjsiziWXDR7qkOcBjRqSMgxNf6QUEPODAru3tG5YH2/
> 
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> 8:30 PM

KR> Ivoprop?

[Jeff Scott]

You guys need to take advantage of the past writings in the KRNet archive on 
this subject.  The Ivo props have been tested on the VWs and found to be a 
failure with a lousy company that won't stand behind them.  Orma Robbins is a 
long time A/IA/KR builder/pilot with a ton of experience.  I would suggest 
that you get into the "way back" machine called the KRNet Archives (listed at 
the bottom of every KRNet email) and do a search for posts from 
"o...@aviation-mechanics.com" for 2004 with a key word of "Ivo".  I think 
you'll find all the information you need on Ivo.  

Orma used to have a rant page about how the Ivo failed on his plane and how 
badly he was treated by the company following the prop failure, but the web 
page is now gone.  

Almost any subject you guys come up with has been discussed at length in the 
archives, which is why you don't get a lot of comments from guys that have been 
there and done that before.  If you're question was serious, you would look in 
the archives for an answer before posting.  

-Jeff Scott
Los Alamos, NM


Learning Centers - Click Here.
http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTKNdOKf8wNNzjsiziWXDR7qkOcBjRqSMgxNf6QUEPODAru3tG5YH2/

KR> Ivoprop?

[Jeff Wilder]

I know there has been considerable conversations about the suitability of a
3 bladed Ivo prop on a VW.  any verdict on a 4 or 2 blade?


-Jeff

KR> Ivoprop?

[George Bearden]

> it is not recommended due to resonance vibration.

Seems odd to me that it would be resonance... Wouldn't that change with prop
pitch, blade length, rpm, etc?

KR> Ivoprop?

[Bob Lee]

Pete was correct about how the Ivoprop works, the blades are twisted
spanwise to reduce or increase the pitch of the prop.  As Mark L. pointed
out, this is what is required to make a really efficient prop.  So in
theory, the Ivoprop can be a very good option.  Unfortunately, they have
never solved the issue of blade creep in the hub and eventually when used on
a horizontally apposed engine (VW or Corvair) in direct drive you will end
up loosing a blade.  I have flown behind an Ivoprop in a Kitfox with a Rotax
and it was amazing to watch fuel flow go down, RPM go down and airspeed go
up.  As pointed out earlier, this was at much lower speed than a KR flies.
Ivo has come out with Magnum blades to address the high speed issue but
there is still the same hub design that requires frequent inspection to
detect blade movement in the hub.

Bottom line, Ivo is not ready to be "good enough for a KR".  Who wants to
have a one bladed prop anyway?

Regards,


Bob Lee
N52BL  KR2
Suwanee, GA  USA
92% done only 67% to go!

KR> Ivoprop?

[Mark Langford]

The thing about ground adjustable props is that they are not the magic 
bullet that one might think.  The blades still have a fixed amount of twist 
in them, and simply rotating the blades around in their sockets doesn't 
really change the "washout" on the blades from root to tip, it simply 
rotates them around to get the most effective part of the blade correct. 
It's for that reason that a correctly optimized fixed pitch blade will be 
more efficient than a ground adjustable prop where the blades are simply 
rotated.  Another problem with that kind of prop is that all (two or three) 
blades have to be set at exactly the same angle, or you'll get more or less 
bite from one  of them, leading to an aerodynamic imbalance in the way the 
blade pulls, which will lead to an oscillating bending load on the end of 
the crank, which makes it more likely to fatigue and break.

My advice would be to check the "KR-info" list at 
http://www.krnet.org/kr-info.html , where there's a pretty comprehensive 
list of KRs, their engines, and their props.  Many of these have been 
optimized through trial and error, and are certainly a good starting point. 
My advice would be to start with a choice that is known to work well (a used 
prop would be best), and fly the thing for while refining the aerodynamics 
of the plane (adding wheel pants other other such stuff).  Then after 
learning whether you want better climb speed or better top speed, lower or 
higher rpm, or whatever, start worrying about getting the prop perfect.

I've heard too many disparaging stories about the IVO over the years, many 
of which are in the CorvAircraft archives at 
http://www.maddyhome.com/corvairsrch/index.jsp .  Just put IVO in the 
keyword box.

Speaking of the "KR-info" list at http://www.krnet.org/kr-info.html , I only 
got one update last time I asked, and I know there are more planes that 
could stand to have their performance data updated, so send them on...

Mark Langford, Huntsville, AL
mail: N56ML "at" hiwaay.net
website: www.N56ML.com

KR> Ivoprop?

[Randy Smith]

Ask Ivo they will tell you. I was one of the first to try Ivo on  VW back in 
93. It hit a wall at 120 mph. Would not keep motor cool. Did not run it more 
than 20 hrs. They gave me all my money back. Tried Warp first after 15 hrs and 
no help at all from them, I sold it to a friend for $100 with hub and he was 
flying it on a Volksplane the last I heard.

--- On Thu, 5/28/09, Willie van der Walt <touri...@intekom.co.za> wrote:


From: Willie van der Walt <touri...@intekom.co.za>
Subject: RE: KR> Ivoprop?
To: "'KRnet'" <kr...@mylist.net>
List-Post: krnet@list.krnet.org
Date: Thursday, May 28, 2009, 12:40 AM


There has been a debate on this forum regarding any 3 blade props on ,direct
drive, Volkswagen engines. (If I remember correctly)The conclusion was that
it is not recommended due to resonance vibration. Check the archives. 

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of bobby burington
Sent: Thursday, May 28, 2009 6:23 AM
To: KRnet
Subject: RE: KR> Ivoprop?


I have seen other three blade props on a volkswagen, why can this prop not
be used ?.



--- On Wed, 5/27/09, Willie van der Walt <touri...@intekom.co.za> wrote:

> From: Willie van der Walt <touri...@intekom.co.za>
> Subject: RE: KR> Ivoprop?
> To: "'KRnet'" <kr...@mylist.net>
> Date: Wednesday, May 27, 2009, 9:09 PM
> Works well on a Rotax 912 but can not
> be used on a Volkswagen if it is a 3
> blade.



      

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KR> Ivoprop?

[Phillip Matheson]

Works well on a Rotax 912 but can not be used on a Volkswagen if it is a 3 
blade.


I think you should refine that and say , NOT on a direct drive. I have a 3 - 
blade, 60 in Dia , ground adjustable Bolly on my Type 4 rear drive, BUT, it 
has a belt drive reduction.



Phil Matheson
SAAA Ch. 20  http://www.saaa20.org/
VH-PKR
Australia

EMAIL:   phillipmathe...@bigpond.com
KR Web Page: www.philskr2.50megs.com


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KR> Ivoprop?

[Tim]

I remember an IVO Prop on a canard 4 Seater (Velocity?) Family 4 Killed, 
anyhow it thru one of it's 3 blades and Crashed into a large treed area, 
NTSB Identification: ATL98FA017 . andjust this month (May 09/09) 
similar Velocity accident> 3 blade one found west of accident scene, 
un-reported prop Manf. NTSB Identification: CEN09LA288

CldLk-Tim

- Original Message - 
From: "Willie van der Walt" <touri...@intekom.co.za>
To: "'KRnet'" <kr...@mylist.net>
Sent: Wednesday, May 27, 2009 11:40 PM
Subject: RE: KR> Ivoprop?



There has been a debate on this forum regarding any 3 blade props on ,direct
drive, Volkswagen engines. (If I remember correctly)The conclusion was that
it is not recommended due to resonance vibration. Check the archives.

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of bobby burington
Sent: Thursday, May 28, 2009 6:23 AM
To: KRnet
Subject: RE: KR> Ivoprop?


I have seen other three blade props on a volkswagen, why can this prop not
be used ?.



--- On Wed, 5/27/09, Willie van der Walt <touri...@intekom.co.za> wrote:

> From: Willie van der Walt <touri...@intekom.co.za>
> Subject: RE: KR> Ivoprop?
> To: "'KRnet'" <kr...@mylist.net>
> Date: Wednesday, May 27, 2009, 9:09 PM
> Works well on a Rotax 912 but can not
> be used on a Volkswagen if it is a 3
> blade.





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KR> Ivoprop?

[rdrace...@aol.com]

It shows a 3 bladed prop in the picture on the link, but if you follow some of 
the links further there is a price listed for an inflight adjustable 2 blad 
prop.

Todd Thelin
Spanaway, WA


-Original Message-
From: Willie van der Walt <touri...@intekom.co.za>
To: 'KRnet' <kr...@mylist.net>
Sent: Wed, 27 May 2009 10:40 pm
Subject: RE: KR> Ivoprop?



There has been a debate on this forum regarding any 3 blade props on ,direct
drive, Volkswagen engines. (If I remember correctly)The conclusion was that
it is not recommended due to resonance vibration. Check the archives. 

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of bobby burington
Sent: Thursday, May 28, 2009 6:23 AM
To: KRnet
Subject: RE: KR> Ivoprop?


I have seen other three blade props on a volkswagen, why can this prop not
be used ?.



--- On Wed, 5/27/09, Willie van der Walt <touri...@intekom.co.za> wrote:

> From: Willie van der Walt <touri...@intekom.co.za>
> Subject: RE: KR> Ivoprop?
> To: "'KRnet'" <kr...@mylist.net>
> Date: Wednesday, May 27, 2009, 9:09 PM
> Works well on a Rotax 912 but can not
> be used on a Volkswagen if it is a 3
> blade.





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KR> Ivoprop?

[Willie van der Walt]

There has been a debate on this forum regarding any 3 blade props on ,direct
drive, Volkswagen engines. (If I remember correctly)The conclusion was that
it is not recommended due to resonance vibration. Check the archives. 

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of bobby burington
Sent: Thursday, May 28, 2009 6:23 AM
To: KRnet
Subject: RE: KR> Ivoprop?


I have seen other three blade props on a volkswagen, why can this prop not
be used ?.



--- On Wed, 5/27/09, Willie van der Walt <touri...@intekom.co.za> wrote:

> From: Willie van der Walt <touri...@intekom.co.za>
> Subject: RE: KR> Ivoprop?
> To: "'KRnet'" <kr...@mylist.net>
> Date: Wednesday, May 27, 2009, 9:09 PM
> Works well on a Rotax 912 but can not
> be used on a Volkswagen if it is a 3
> blade.





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11:43:00

KR> Ivoprop?

[bobby burington]

I have seen other three blade props on a volkswagen, why can this prop not be 
used ?.



--- On Wed, 5/27/09, Willie van der Walt <touri...@intekom.co.za> wrote:

> From: Willie van der Walt <touri...@intekom.co.za>
> Subject: RE: KR> Ivoprop?
> To: "'KRnet'" <kr...@mylist.net>
> Date: Wednesday, May 27, 2009, 9:09 PM
> Works well on a Rotax 912 but can not
> be used on a Volkswagen if it is a 3
> blade.

KR> Ivoprop?

[Willie van der Walt]

Works well on a Rotax 912 but can not be used on a Volkswagen if it is a 3
blade.

-Original Message-
From: krnet-bounces+tourinfo=intekom.co...@mylist.net
[mailto:krnet-bounces+tourinfo=intekom.co...@mylist.net] On Behalf Of dustin
Reves
Sent: Thursday, May 28, 2009 3:31 AM
To: KRNET LIST POST
Subject: KR> Ivoprop?


Have any of you guys looked into one of these? 

www.ivoprop.com

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KR>IVOPROP and COG

[Barry Kruyssen]

Hi All,

I've just re-done the Weights and Balances with the following results

Pilot and Passenger each weigh 81.5 kg  179.67 lbs
Fuel 42ltr (11 US gallons) 29.5 kg   65.04 lbs
Baggage  16 kg   35.27 lbs

Actual Weights  
Empty Weight 241.48 kg  532.37 lbs

Pilot Only   322.98 kg  712.04 lbs
C of G from Leading Edge210 mm8.27 ins

Pilot + Fuel 353.98 kg  780.38 lbs
C of G from Leading Edge207 mm8.15 ins

Calculated Values   
Pilot, Passenger, Bags   420.48 kg  926.99 lbs
C of G from Leading Edge383 mm   15.08 ins

Pilot, Passenger, Bags + Fuel451.48 kg  995.33 lbs
C of G from Leading Edge353 mm   13.90 ins

Now the next question is, I want to put on an in-flight adjustable propeller 
which will approximately add 7kg which will move my C of G to the forward 
limit, 203mm (8in), with only me and zero fuel, Is this going to be a problem?

And what reports have people heard about the IVOPROP propellers?
Are there other/better options for adjustable propellers? 

Thanks
Barry Kruyssen
k...@bigpond.com

AUF Registered 19-3873

KR>ivoprop

[jehayw...@aol.com]

In a message dated 6/28/03 9:02:56 PM Mountain Daylight Time, 
lar...@socal.rr.com writes:

<< Is anyone familiar with the in-flight adjustable prop by Ivoprop? I plan 
to visit airports at a variety of MSL from SL to 6000 ft. It seems like the 
only answer. >>

They aren't very well thought of in some ultralight circles.

Jim Hayward
Rapid City, SD

KR>ivoprop

[larry severson]

Is anyone familiar with the in-flight adjustable prop by Ivoprop? I plan to 
visit airports at a variety of MSL from SL to 6000 ft. It seems like the 
only answer.

Larry Severson
Fountain Valley, CA 92708
(714) 968-9852
lar...@socal.rr.com

KR>ivoprop

[Justin]

I am somewhat familiar with that prop. I wont be using it because it doesnt
actually move the blades but "tweaks" them to change pitch. Fiberglass
blades that will have fatiage and many reports of these props failing in
flight.I plan on using this prop. www.climbandcruise.com

Justin
KR2S


- Original Message -
From: "larry severson" <lar...@socal.rr.com>
To: "KR builders and pilots" <kr...@mylist.net>
Sent: Saturday, June 28, 2003 10:02 PM
Subject: KR>ivoprop


>
>
> Is anyone familiar with the in-flight adjustable prop by Ivoprop? I plan
to
> visit airports at a variety of MSL from SL to 6000 ft. It seems like the
> only answer.
>
> Larry Severson
> Fountain Valley, CA 92708
> (714) 968-9852
> lar...@socal.rr.com
>
>
> ___
> see KRnet list details at http://www.krnet.org/instructions.html
>

KR>ivoprop

[aviationm...@aol.com]

I just installed an IVOprop and have yet to test it.  I could not afford the 
in-flight option, but the prop is the same.  The blades have a torque rod down 
the center and by twisting the adjuster mechanism, the twist along the shaft 
while the base is held firm.  I think it would be an excellent option.

Orma AKA AviationMech
KR-2 N110LR
1984 to Present
www.members.aol.com/aviationmech
also see me at 
www.aviation-mechanics.com

KR>ivoprop

[aviationm...@aol.com]

In a message dated 6/29/2003 1:25:44 AM Eastern Daylight Time, 
jmw...@socal.rr.com writes:

> www.climbandcruise.com

They list the price for the prop and hubs at over $5000.00, that's probably 
too pricey for most KR drivers
Orma AKA AviationMech
KR-2 N110LR
1984 to Present
www.members.aol.com/aviationmech
also see me at 
www.aviation-mechanics.com