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Compressor

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rijaeger(at)wausau.k12.wi
Guest

Posted: Thu May 09, 2013 5:55 am Post subject: Compressor

So far - after chasing air system demons for 7 months - I've managed to avoid the obvious need for therapy and skirt a complete psychotic break down...but I'm getting close. Would anyone out there have a serviceable compressor you'd be willing to A) loan out (w/ a deposit) for testing purposes or B) sell outright at a price that will still allow me to purchase fuel IF my Yak ever becomes a fully-functioning aircraft? Wow. Hydraulics seem super-sexy to me right now... I would highly appreciate any help, Guys! THANX! 



-- 

Rico Jaeger

 Choir / East High School

 General Music / Horace Mann

 

  [quote][b]

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Harv

Joined: 01 Jul 2010
Posts: 172

Posted: Thu May 09, 2013 11:00 pm Post subject: Re: Compressor

Rico



Are you talking about a CJ6 or Yak compressor?



What's the problem with your air system, a re-cap and fresh look at it from someone on this list might turn up something you've missed.



 

Rgs

Harv

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Dale

Joined: 30 May 2007
Posts: 178

Posted: Fri May 10, 2013 5:36 am Post subject: Re: Compressor

Compressor same on both Cj and Yak.  If your going through all the trouble to take it off you might as well clean yours and check for all the carbon .  You can then turn it by hand to see if it pumps air.  Look at the check valves and small port along with the top of piston.

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threein60(at)yahoo.com
Guest

Posted: Fri May 10, 2013 6:43 am Post subject: Compressor

`And appearantly the AN2 is the same.  I fly with an AN2 compressor.  About 4-5 inches longer and it appears there is a second compressor on top of what would be the normal M14 compressor.  Works great.  I can recharge an empty bottle at idle in about 5 minutes.

 

  

 Larry Pine

 



    

From: Dale <dale(at)frii.com>

To: yak-list(at)matronics.com 

Sent: Friday, May 10, 2013 6:36 AM

Subject: Yak-List: Re: Compressor



 

--> Yak-List message posted by: "Dale" <dale(at)frii.com (dale(at)frii.com)>



Compressor same on both Ci and Yak





Read this topic online here:



http://forums.matronics.com/viewtopi= Same great content also available p;                     -M===============

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mark.bitterlich(at)navy.m
Guest

Posted: Fri May 10, 2013 8:23 am Post subject: Compressor

That's a sweet setup Larry.  



Mark

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markdavis(at)wbsnet.org
Guest

Posted: Fri May 10, 2013 9:48 am Post subject: Compressor

Does anyone know if the AN2 compressor pulls significantly more horsepower 

to run the higher volume output?  I've seen the AN2 compressors on eBay 

before and knew they would fit but didn't know if they pulled harder and 

would cause a slightly higher fuel burn unless they were unloaded in flight.



Mark Davis

N44YK

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threein60(at)yahoo.com
Guest

Posted: Fri May 10, 2013 10:17 am Post subject: Compressor

I can just tell you from  my experience.. I can unload mine in flight and i see virtually no difference in % or speed between the two.  Because it is bigger it has to be clocked at a different angle which in my case required the oil hose from the screen to the pump to be made longer and re-routed.  Love the extra air though...

 

  

 Larry Pine

 



    

From: Mark Davis <markdavis(at)wbsnet.org>

To: yak-list(at)matronics.com 

Sent: Friday, May 10, 2013 10:45 AM

Subject: Re: Re: Compressor



 

--> Yak-List message posted by: "Mark Davis" <markdavis(at)wbsnet.org (markdavis(at)wbsnet.org)>



Does anyone know if the AN2 compressor pulls significantly more horsepower 

to run the higher volume output?  I've seen the AN2 compressors on eBay 

before and knew they would fit but didn't know if they pulled harder and 

would cause a slightly higher fuel burn unless they were unloaded in flight.



Mark Davis

N44YK

---

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richard.goode(at)russiana
Guest

Posted: Fri May 10, 2013 10:17 am Post subject: Compressor

By definition they will use more power, but not really significant. Standard

compressor uses a maximum of 3 hp.



Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5 3LW



Tel:  +44 (0) 1544 340120

Fax: +44 (0) 1544 340129

www.russianaeros.com

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mark.bitterlich(at)navy.m
Guest

Posted: Fri May 10, 2013 10:36 am Post subject: Compressor

Mark, if you see them listed again on EBay again, please do me a favor

and send an alert my way, because I truly want one or two myself.  Maybe

three.    



I think we could discuss the issue of power robbing pretty easily.

Given that the volumetric output of this compressor is higher than the

one we currently have, when the pump is filling an empty bottle, it

clearly is going to draw more power from the engine.  How much exactly

would require a good deal of engineering data that would probably be an

exercise in frustration.  



However, that is only transitional since the tank is going to fill more

rapidly and reach the point where the blow-off valve opens to relieve

over-pressure earlier. Thus the distributed load between the two while

filling is going to be about the same right?    



So the question then becomes how much power is being robbed from the

engine as the compressor produces enough volume at approximately 735 PSI

to open the over-pressure valve.  Since it has a higher volume output,

the engine is going to be putting power into the compressor for an

equivalently longer period of time as that excess volume is blown off

through the relief valve.  



So a fair comparison of the power robbed from the engine could be

computed by knowing the exact differences in volume under load at 735

PSI for each compressor type.  My personal opinion is that you would be

hard pressed to feel the difference.  



This whole concept of "unloading" the compressor with the use of a

home-made arrangement of either opening the snot valve, or more

expensive yet, with the use of an electrically controlled relief valve

has always struck me as "urban legend".  Yes, I have seen it on quite a

number of Unlimited Competitive Sukhoi's, and I am also aware of exactly

who came up with this concept in the first place.  These same folks are

using every trick in the book to increase aircraft performance in ANY

WAY POSSIBLE, and they'll do it if there is even a CHANCE of it being

real.  These same gents were also plugging up the accelerator pump in

the pressure carbs too, which in the end turned up to be less than a

good thing.  



So in the end, I ask myself this question:  Do you think that a three

horsepower four stroke gas lawnmower engine could drive our current

compressor to about 2000 RPM and deliver 735 PSI of output?  Yes I

believe it would.  But if there is any doubt, I am DARN sure that a 5 HP

engine would!  



So, at load the compressor might be robbing 3-5 HP or so ...   And worse

yet, as the compressor wears out, once the tank is full, it draws even

less load.  



So how much additional fuel do you think you'll burn for about three

horsepower? 



Then there is the issue of bearing loads.  Will this compressor last

longer if it is operating under load at all times, or if you release all

load and just have it running along at full speed against zero load?

I'm really not sure.  The question is not as easy to answer as one might

think.  In any case, I do not unload mine, and the original compressor

is now reaching 800 hours and is still working perfectly.  



Of course if you DO unload it, in theory the only difference between the

two would be frictional load, which would be very minimal. 



Too long an email I know, but this is something I have had an opinion

about for a long time and just never felt like verbalizing it.  Unless

you are looking for the ultimate edge, I don't believe unloading

compressors is really necessary... but I would be more than glad to hear

opinions otherwise based on factual info.  



In the interim, I want one of the AN2 compressors.    



mgb



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