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"
 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" 
> To: "'KRnet'" 
> 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" 
> To: "KRnet" 
> 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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> 
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> 

Rock Solid Web Hosting. Click Here.
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KR> Looking for C-FVML

[Darren Pond]

Sorry gang for this email.


I gave C-FVML Taylor Mono plane away a few years ago and the fellow has yet
to re-register it.

Figured I give him one last chance before I tell Transport Canada its gone.



Last I heard it was headed for a town north of Peterborough Ontario Canada.



I lost his contact after a tech support formatted my hard drive. (now
there's another story)



Keep building it will be warm soon.



Darren Pond

pilotp...@rogers.com

KR2  C-GGGW (still in the Garage for a bit longer)

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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18:22:00