KR> Venturi on a KR2S

[Gary Shubert]

I just want to thank everyone who responded to my post.

There were a lot of "opinions" and some very good food for thought.

Glenda and WW's reply's must have taken 30 minutes to an hour to each to
generate.  Collectively the time spent to generate the various replies to my
question took several hours of effort from a group of people who have never
met me but share a common interest.

One thing I can speak to from personal experience is that it is HARD to find
time to work on my own project.  I am very grateful to any one who will take
time out of "their" busy lives to provide helpful information in response to
a question or even a dumb idea.

Thanks Again

Gary Shubert

KR2 - One step closer to finished

KR> Venturi on a KR2S

[Mark]

I am really of two minds on this. I have been involved with electronics
stuff for 30 years (unless you count my dad teaching me binary math in the
early '60's) so I have a high confidence level for the "chips", however, I
would really feel more comfortable with "mechanical" stuff as back up.

Mark W. 

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Bob Lee
Sent: Tuesday, February 24, 2009 9:31 PM
To: KRnet
Subject: Re: KR> Venturi on a KR2S

KRheads,

It has been stated:  "I've been struggling to find a way to drive my vacuum
pump on my KR2S..."

In this day and age, why would you consider steam gages as something that
you want on your KR?

There are many options for electrical substitutions for steam gages that
would give you a much better option to make your KR a light weight IFR
bird.  In my case I have installed dual alternators a preference over a
vaccume pump and a single alternator.  All electric gives you  much better
flexibility to keep important things working regardless of which power
source fails.  Don't think you need vaccume because they used to do it that
way.  What is the best way for you to get your KR on the mission you want it
on now?  That is the only thing that matters.

Regards,

Bob Lee
N52BL  KR2
Suwanee, GA
91% complete, only 51% left!
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19:22:00

KR> Venturi on a KR2S

[Bob Lee]

KRheads,

It has been stated:  "I've been struggling to find a way to drive my vacuum
pump on my KR2S..."

In this day and age, why would you consider steam gages as something that
you want on your KR?

There are many options for electrical substitutions for steam gages that
would give you a much better option to make your KR a light weight IFR
bird.  In my case I have installed dual alternators a preference over a
vaccume pump and a single alternator.  All electric gives you  much better
flexibility to keep important things working regardless of which power
source fails.  Don't think you need vaccume because they used to do it that
way.  What is the best way for you to get your KR on the mission you want it
on now?  That is the only thing that matters.

Regards,

Bob Lee
N52BL  KR2
Suwanee, GA
91% complete, only 51% left!

KR> Venturi on a KR2S

[John Gotschall]

Your welcome, glad you liked it.

However, were I to do it again: instead of a v-belt I'd use a flat
(micro-v) belt (ala revmaster).  That would allow me to mount smaller
pulleys onto the same shaft locations while still getting the same 3800
to 2500 rpm ratio between the pulleys.

Also flat pulleys are naturally better suited to making tighter turns at
higher speeds (around smaller pulleys) than V-belts.

In fact this has been bugging me so much that I may make another set of
pulleys rather than keep the set I made for the V-belt.

Don't try to run the micro-v flat belt on a flat shaft surface, it needs
the little groovlets to grip onto.

Did someone say that everything took three times to get it right?

jg

On Tue, 2009-02-24 at 06:11 -0500, Gary Shubert wrote:
> Date: Mon, 23 Feb 2009  John Gotschall wrote:
> 
> Thanks that is exactly the type of information I was looking for.
> 
> Gary
> 

[Bulk] Re: KR> Venturi on a KR2S

[cgardn628]

KR Heads

Well that is exactly where I have one on the belly of my KR2S , which some
may have seen at the 2008 KR gathering.

I do have a suction gauge and a restrictor valve as the cruise speeds of the
KR generate too much vacuum ( at 135+ mph). I have the suction set for
correct suction pressure ( green band) at 80 mph ( approach speed) just in
case I need it for approach one day.

The venture is mounted on the left side under the belly in the exhaust
stream of the 4 into 1 pipe.

Chris Gardiner
KR2S



-Original Message-
From: krnet-bounces+cgardn628=rogers@mylist.net
[mailto:krnet-bounces+cgardn628=rogers@mylist.net] On Behalf Of
jscott.pi...@juno.com
Sent: Sunday, February 22, 2009 10:05 PM
To: kr...@mylist.net
Subject: [Bulk] Re: KR> Venturi on a KR2S

re: Running a gyro with engine manifold vacuum, you will find that you
aren't going to get enough vacuum to operate a gyro while running at high
throttle settings, which is where I'm almost always running.  Venturis
work great.  My Stinson Voyagers had them.  One of them had the venturi's
mounted on the belly right behind the engine air outlet, so it was
already in the disturbed air without creating a lot more drag.  

Jeff Scott
Los Alamos, NM


On Sun, 22 Feb 2009 21:34:15 -0500 "Randy Powell"
<randywpow...@verizon.net> writes:
> I agree in my case it is only for backup in IFR conditions.  But if 
> it was 
> tapped into the main induction runner the mixture would be adjusted 
> with it 
> in place, and would compensate for the extra air.   There might be a 
> problem 
> at wide open throttle reducing the intake vacuum and not providing 
> sufficient vacuum for the instruments..
> 
> - Original Message - 
> From: "Dan Heath" <da...@windstream.net>
> To: "'KRnet'" <kr...@mylist.net>
> Sent: Sunday, February 22, 2009 9:00 PM
> Subject: RE: KR> Venturi on a KR2S
> 
> 
> I have seen that done before, but the problem is that it leans the 
> mixture,
> so you might want to keep it only for back up.
> 
> -Original Message-
> From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On 
> Behalf
> Of Randy Powell
> Sent: Sunday, February 22, 2009 8:28 PM
> To: Kirk Lacewell; KRnet
> Subject: Re: KR> Venturi on a KR2S
> 
> On my Cherokee there is an alternate vacuum source which consists of 
> a valve
> 
> tapped into one of the intake runners.  It works well and I wonder 
> if this
> would work equally as well as a primary vacuum source on other 
> aircraft.
> Just a thought.
> 
> 
> ----- Original Message - 
> From: "Kirk Lacewell" <kirk.lacew...@mostqualified.com>
> To: "KRnet" <kr...@mylist.net>
> Sent: Sunday, February 22, 2009 7:23 PM
> Subject: KR> Venturi on a KR2S
> 
> 
> I've been struggling to find a way to drive my vacuum pump on my 
> KR2S and
> just had the thought. Why not forget the pump and use a Venturi?
> 
> Anyone know of a good reason not to use a Venturi?
> 
> Anyone know of someone using one on a KR?
> 
> Thanks,
> Kirk Lacewell
> ___
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KR> Venturi on a KR2S

[Gary Shubert]

List-Post: krnet@list.krnet.org
Date: Mon, 23 Feb 2009  John Gotschall wrote:



>You can try the method I used, ... Look for a link to "vaccuum system" at



>http://www.mykr2.com



Thanks that is exactly the type of information I was looking for.



Gary

KR> Venturi on a KR2S

[John Martindale]

One of the concerns with a venturi system is that it produces less suction
at low speed and hence it takes longer to spin up a gyro to its operational
speed, that is, a venturi is at its worst on takeoff when the need for
attitude guidance can be at its most critical. I think it is important to
have a vacuum gauge linked to a venturi so you can be sure you have
sufficient (usually about 5") to run your system reliably.  


John Martindale
29 Jane Circuit
Toormina NSW 2452
AUSTRALIA

ph: 61 2 6658 4767 (H)
mob: 0403 432179
email: johnja...@optusnet.com.au
web:www.members.optusnet.com.au/johnjanet/Martindale.htm

-Original Message-
From: krnet-bounces+johnjanet=optusnet.com...@mylist.net
[mailto:krnet-bounces+johnjanet=optusnet.com...@mylist.net] On Behalf Of
John Gotschall
Sent: Tuesday, 24 February 2009 2:30 PM
To: KRnet
Subject: Re: KR> Venturi on a KR2S



You can try the method I used,

look at the last few pics on the main page (internet exploder users may have
to go right rather than down to see the pics) and look for a link to
"vaccuum system" at

http://www.mykr2.com

belt driven vaccuum pump vw2100 all home brew.

turns the pump at 2500 rpm when the crank turns 3800.


jg

turbo 2180 kr2, N611GB
Puyallup, WA



On Mon, 2009-02-23 at 18:40 -0500, Gary Shubert wrote:
> >  I've been struggling to find a way to drive my vacuum pump on my
KR2S...
> 



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Version: 8.0.237 / Virus Database: 270.11.3/1968 - Release Date: 02/23/09
18:22:00

KR> Venturi on a KR2S

[John Gotschall]

You can try the method I used,

look at the last few pics on the main page (internet exploder users may
have to go right rather than down to see the pics) and look for a link
to "vaccuum system" at

http://www.mykr2.com

belt driven vaccuum pump vw2100 all home brew.

turns the pump at 2500 rpm when the crank turns 3800.


jg

turbo 2180 kr2, N611GB
Puyallup, WA



On Mon, 2009-02-23 at 18:40 -0500, Gary Shubert wrote:
> >  I've been struggling to find a way to drive my vacuum pump on my KR2S...
> 

KR> Venturi on a KR2S

[Gary Shubert]

>  I've been struggling to find a way to drive my vacuum pump on my KR2S...



I am also working on that one.  This subject might be better for the Corvair
group but here goes.



I want to put a dry pump on my Corvair powered KR2 (still building).  There
appear to be several approaches three are shown on Glenda McElwee's sight
http://www.awesometrvl.com/vacuum_pump_info.htm



My questions are as follows



Front Mount System - Has anyone ever mounted one in a similar location
"opposite" the harmonic balancer?

Revmaster Type System - You can buy this outright from Revmaster but what
are the thoughts on driving the pump with a pulley?

Dan Diehl System - Appairently this is no longer available from DD.  Has
anyone had actual experience with this system?



Also are there any construction details for any of these systems?  I am not
interested in copying something that I should buy, but if some sort of
construction information is available then that would be a big help.



Gary Shubert

Single Place KR2 -N325JG Some Day

KR> Venturi on a KR2S

[rahu...@peoplepc.com]

For all the time, money, weight and complexity to fit venturi's, vacuum 
pumps etc. (not to mention endless posts!) Don't you think it would be less 
of all to step into the 21st century and take advantage of one of the many 
EFIS's now on the market?
All in all they are more reliable, offer better information at a glance 
(with a little training) and in the long run less expensive.

Rick Human
N202RH
Houston, Texas 

KR> Venturi on a KR2S

[Larry H.]

At least 30 years ago I knew a machinist (a friend of my fathers) who used 
something I had never seen before. When using his milling machine he used a 
vacuum plate (a vacuum plate is a big rectangular piece of steel that has a lot 
of little holes drilled into the top surface of it. Those holes all are 
connected to a hollow area inside the block that is attached to a air fitting 
that goes to the vacuum source) to hold thin items down that were things that 
could not be clamped or that were not magnetic, such as carbon blocks. This way 
they can fly cut the whole top surface of their part. His vacuum source was 
created by his air compressor. I am sure any of you who have done machining 
have seen these. He had a small piece of metal plate (about 3 or 4 inches in 
diameter round and maybe 1/2 to 3/4" thick) a hole was drilled all the way 
through one edge and out the other side of it or at least had a airline fitting 
one on the in and and one on the out
 side. On one of the sides perpendicular to the drill through line, a hole was 
drilled half way through only to the already drilled hole. The air compressor 
was attached to the in and out that went all the way through the round plate, 
the vacuum line to his vacuum plate was attached to the fitting on the 
perpendicular hole that was drilled half way through the block which 
intersected the all the way through hole. The air going into the block from the 
air compressor was regulated, as the air passed through the block it created a 
vacuum on the perpendicular hole. I have no idea how big the holes were, I just 
thought that was pretty neat at the time. It may be more complicated inside 
that little block than I imagined at the time. I imagined the same scenario 
when the exhaust idea was proposed by Darren who must have burned his lips with 
that hot coffee to think about the exhaust !   : )   I just assumed the 
idea consisted of a small hole drilled
 into the side of the exhaust pipe with a fitting welded around the hole and a 
vacuum line attached to it then going to the gyros by way of a vacuum 
regulator. As in my above explanation of the air compressor supplying the air 
flow, in this case the engines exhaust would be the air flow source down the 
exhaust pipe at high speed. It might work like this and it might not, it will 
only require someone to try it I guess. This is why I was kidding about using 
plastic fittings and plastic line attached to the side of the exhaust in my 
previous post. Here is a link below that begins to describe what I am talking 
about. I know my story at the top about the machinist I knew was a simplified 
version but that is what I imagined when I looked at that tiny round block he 
had the airlines attached to.

http://www.hyvac.com/Products/O_pumps/Air%20Venturi/Air_Venturi_vacuum.htm

Here is one more website that may be more like what I described at the top, but 
the man I knew had a round plate type instead of a round rod type like this 
one. This site has a video that you should watch and it will clear up any fuzzy 
thoughts. This system uses aircompressor pressure and air flow to create the 
vacuum.

http://www.exair.com/en-US/Primary%20Navigation/Products/Vacuum%20Generators/Pages/E-Vac%20Vacuum%20Generators.aspx?source=msn

Larry Howell



The problem is that nothing is free.  One could certainly use a venturi on or 
in the exhaust stream, but doing so is a restriction in the exhaust, which 
would inhibit exhaust flow and impact engine performance.  I can't estimate how 
much or whether it would even be noticeable.  I suspect someone with more 
expertise than me in exhaust tuning or an engineer with fluid dynamics software 
might be able to give a rough estimate.

I suspect the answer is that back in the 30s and 40s when gyros and venturis 
were first used, it was likely discovered that the impact to the engine 
performance was more than the impact of drag of the venturi on the plane.  
However, the planes of that day were much slower and draggier than our KRs, so 
that explanation may not hold water for our application.

One thing I try to keep in mind when these ideas come up is that there are over 
100 years of aviators and aviation engineers that have proceeded us, many of 
whom were quite ingenious.  If they didn't do it, you need to look for the 
reasons why. This isn't the first time I've heard this idea floated, but I've 
never seen it in use.  Doesn't mean it can't work, but makes me question why we 
haven't seen it before.

Jeff Scott
Los Alamos, NM


-- Darren Crompton  wrote:
Maybe I have drunk too much coffee today, but is there anything to stop one
from running a vacuum line off the exhaust?

-- 
Darren Crompton
AUSTRALIA

KR> Venturi on a KR2S

[Jeff Scott]

The problem is that nothing is free.  One could certainly use a venturi on or 
in the exhaust stream, but doing so is a restriction in the exhaust, which 
would inhibit exhaust flow and impact engine performance.  I can't estimate how 
much or whether it would even be noticeable.  I suspect someone with more 
expertise than me in exhaust tuning or an engineer with fluid dynamics software 
might be able to give a rough estimate.

I suspect the answer is that back in the 30s and 40s when gyros and venturis 
were first used, it was likely discovered that the impact to the engine 
performance was more than the impact of drag of the venturi on the plane.  
However, the planes of that day were much slower and draggier than our KRs, so 
that explanation may not hold water for our application.

One thing I try to keep in mind when these ideas come up is that there are over 
100 years of aviators and aviation engineers that have proceeded us, many of 
whom were quite ingenious.  If they didn't do it, you need to look for the 
reasons why. This isn't the first time I've heard this idea floated, but I've 
never seen it in use.  Doesn't mean it can't work, but makes me question why we 
haven't seen it before.

Jeff Scott
Los Alamos, NM


-- Darren Crompton  wrote:
Maybe I have drunk too much coffee today, but is there anything to stop one
from running a vacuum line off the exhaust?

-- 
Darren Crompton
AUSTRALIA



Switch to the thrill of high speed internet for $19.95/mo with AT
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KR> Venturi on a KR2S

[GM]

>
> Anyone know of someone using one on a KR?

Not on KR but BX2. (Not much of a difference).   Jan Hermsen is building 
one. You will find his email on the first picture.
http://www.xs4all.nl/~hermhart/phamj/

Move the slider under thumbnails all the way to the right.  Venturi is on 
11-th picture from the end.


George
Westbury, NY 

KR> Venturi on a KR2S

[Larry H.]

Only if you use plastic fitting and line !    : )
Larry H.





Maybe I have drunk too much coffee today, but is there anything to stop one
from running a vacuum line off the exhaust?

-- 
Darren Crompton
AUSTRALIA

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

KR> Venturi on a KR2S

[Larry Eilenberger]

I had the same thought: a venturi in the exhaust pipe

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Darren Crompton
Sent: Monday, February 23, 2009 8:10 AM
To: KRnet
Subject: Re: KR> Venturi on a KR2S

Maybe I have drunk too much coffee today, but is there anything to stop one
from running a vacuum line off the exhaust?

-- 
Darren Crompton
AUSTRALIA

My web site: www.kr-2s.com
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KR> Venturi on a KR2S

[Darren Crompton]

Maybe I have drunk too much coffee today, but is there anything to stop one
from running a vacuum line off the exhaust?

-- 
Darren Crompton
AUSTRALIA

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

KR> Venturi on a KR2S

[jscott.pi...@juno.com]

On Mon, 23 Feb 2009 14:14:45 +1100 Darren Crompton
 writes:
> >
> > One of them had the venturi's
> > mounted on the belly right behind the engine air outlet, so it 
> was
> > already in the disturbed air without creating a lot more drag.
> >
> 
> 
> Jeff.
> 
> I am guessing that having the venturi in that position would also 
> reduce the
> possibility of icing as the air from the outlet and even exhaust 
> would be
> warmer than the ambient temperature.
> 
> -- 
> Darren Crompton
> AUSTRALIA

I always figured that too, but wasn't willing to fly my Stinson into the
ice to find out. :o)

-Jeff Scott
Los Alamos, NM

Find furnishings here. The home and garden directory.
http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTGEXe6pQv5WDKFIqTuVgw3j2qPAbITaEwMVvSpwJXbEGmq6lk971n/

KR> Venturi on a KR2S

[Darren Crompton]

>
> One of them had the venturi's
> mounted on the belly right behind the engine air outlet, so it was
> already in the disturbed air without creating a lot more drag.
>


Jeff.

I am guessing that having the venturi in that position would also reduce the
possibility of icing as the air from the outlet and even exhaust would be
warmer than the ambient temperature.

-- 
Darren Crompton
AUSTRALIA

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

KR> Venturi on a KR2S

[jscott.pi...@juno.com]

re: Running a gyro with engine manifold vacuum, you will find that you
aren't going to get enough vacuum to operate a gyro while running at high
throttle settings, which is where I'm almost always running.  Venturis
work great.  My Stinson Voyagers had them.  One of them had the venturi's
mounted on the belly right behind the engine air outlet, so it was
already in the disturbed air without creating a lot more drag.  

Jeff Scott
Los Alamos, NM


On Sun, 22 Feb 2009 21:34:15 -0500 "Randy Powell"
<randywpow...@verizon.net> writes:
> I agree in my case it is only for backup in IFR conditions.  But if 
> it was 
> tapped into the main induction runner the mixture would be adjusted 
> with it 
> in place, and would compensate for the extra air.   There might be a 
> problem 
> at wide open throttle reducing the intake vacuum and not providing 
> sufficient vacuum for the instruments..
> 
> - Original Message - 
> From: "Dan Heath" <da...@windstream.net>
> To: "'KRnet'" <kr...@mylist.net>
> Sent: Sunday, February 22, 2009 9:00 PM
> Subject: RE: KR> Venturi on a KR2S
> 
> 
> I have seen that done before, but the problem is that it leans the 
> mixture,
> so you might want to keep it only for back up.
> 
> -Original Message-
> From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On 
> Behalf
> Of Randy Powell
> Sent: Sunday, February 22, 2009 8:28 PM
> To: Kirk Lacewell; KRnet
> Subject: Re: KR> Venturi on a KR2S
> 
> On my Cherokee there is an alternate vacuum source which consists of 
> a valve
> 
> tapped into one of the intake runners.  It works well and I wonder 
> if this
> would work equally as well as a primary vacuum source on other 
> aircraft.
> Just a thought.
> 
> 
> ----- Original Message - 
> From: "Kirk Lacewell" <kirk.lacew...@mostqualified.com>
> To: "KRnet" <kr...@mylist.net>
> Sent: Sunday, February 22, 2009 7:23 PM
> Subject: KR> Venturi on a KR2S
> 
> 
> I've been struggling to find a way to drive my vacuum pump on my 
> KR2S and
> just had the thought. Why not forget the pump and use a Venturi?
> 
> Anyone know of a good reason not to use a Venturi?
> 
> Anyone know of someone using one on a KR?
> 
> Thanks,
> Kirk Lacewell
> ___
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> http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html
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> 
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> Checked by AVG - www.avg.com
> Version: 8.0.237 / Virus Database: 270.11.2/1965 - Release Date: 
> 02/21/09
> 15:36:00
> 
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KR> Venturi on a KR2S

[Randy Powell]

I agree in my case it is only for backup in IFR conditions.  But if it was 
tapped into the main induction runner the mixture would be adjusted with it 
in place, and would compensate for the extra air.   There might be a problem 
at wide open throttle reducing the intake vacuum and not providing 
sufficient vacuum for the instruments..

- Original Message - 
From: "Dan Heath" <da...@windstream.net>
To: "'KRnet'" <kr...@mylist.net>
Sent: Sunday, February 22, 2009 9:00 PM
Subject: RE: KR> Venturi on a KR2S


I have seen that done before, but the problem is that it leans the mixture,
so you might want to keep it only for back up.

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Randy Powell
Sent: Sunday, February 22, 2009 8:28 PM
To: Kirk Lacewell; KRnet
Subject: Re: KR> Venturi on a KR2S

On my Cherokee there is an alternate vacuum source which consists of a valve

tapped into one of the intake runners.  It works well and I wonder if this
would work equally as well as a primary vacuum source on other aircraft.
Just a thought.


- Original Message - 
From: "Kirk Lacewell" <kirk.lacew...@mostqualified.com>
To: "KRnet" <kr...@mylist.net>
Sent: Sunday, February 22, 2009 7:23 PM
Subject: KR> Venturi on a KR2S


I've been struggling to find a way to drive my vacuum pump on my KR2S and
just had the thought. Why not forget the pump and use a Venturi?

Anyone know of a good reason not to use a Venturi?

Anyone know of someone using one on a KR?

Thanks,
Kirk Lacewell
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Version: 8.0.237 / Virus Database: 270.11.2/1965 - Release Date: 02/21/09
15:36:00


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No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.0.237 / Virus Database: 270.11.2/1965 - Release Date: 02/21/09 
15:36:00

KR> Venturi on a KR2S

[Dan Heath]

I have seen that done before, but the problem is that it leans the mixture,
so you might want to keep it only for back up.

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Randy Powell
Sent: Sunday, February 22, 2009 8:28 PM
To: Kirk Lacewell; KRnet
Subject: Re: KR> Venturi on a KR2S

On my Cherokee there is an alternate vacuum source which consists of a valve

tapped into one of the intake runners.  It works well and I wonder if this 
would work equally as well as a primary vacuum source on other aircraft. 
Just a thought.


- Original Message - 
From: "Kirk Lacewell" <kirk.lacew...@mostqualified.com>
To: "KRnet" <kr...@mylist.net>
Sent: Sunday, February 22, 2009 7:23 PM
Subject: KR> Venturi on a KR2S


I've been struggling to find a way to drive my vacuum pump on my KR2S and 
just had the thought. Why not forget the pump and use a Venturi?

Anyone know of a good reason not to use a Venturi?

Anyone know of someone using one on a KR?

Thanks,
Kirk Lacewell
___
Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
please see other KRnet info at http://www.krnet.org/info.html







No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.0.237 / Virus Database: 270.11.2/1965 - Release Date: 02/21/09 
15:36:00


___
Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
please see other KRnet info at http://www.krnet.org/info.html

KR> Venturi on a KR2S

[Randy Powell]

On my Cherokee there is an alternate vacuum source which consists of a valve 
tapped into one of the intake runners.  It works well and I wonder if this 
would work equally as well as a primary vacuum source on other aircraft. 
Just a thought.


- Original Message - 
From: "Kirk Lacewell" <kirk.lacew...@mostqualified.com>
To: "KRnet" <kr...@mylist.net>
Sent: Sunday, February 22, 2009 7:23 PM
Subject: KR> Venturi on a KR2S


I've been struggling to find a way to drive my vacuum pump on my KR2S and 
just had the thought. Why not forget the pump and use a Venturi?

Anyone know of a good reason not to use a Venturi?

Anyone know of someone using one on a KR?

Thanks,
Kirk Lacewell
___
Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
please see other KRnet info at http://www.krnet.org/info.html






No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.0.237 / Virus Database: 270.11.2/1965 - Release Date: 02/21/09 
15:36:00

KR> Venturi on a KR2S

[Kirk Lacewell]

I've been struggling to find a way to drive my vacuum pump on my KR2S and just 
had the thought. Why not forget the pump and use a Venturi?

Anyone know of a good reason not to use a Venturi?

Anyone know of someone using one on a KR?

Thanks,
Kirk Lacewell