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rijaeger(at)wausau.k12.wi
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 Posted: Thu May 09, 2013 5:55 am Post subject: Compressor |
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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
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| Posted: Thu May 09, 2013 11:00 pm Post subject: Re: Compressor |
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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
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| Posted: Fri May 10, 2013 5:36 am Post subject: Re: Compressor |
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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
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| Posted: Fri May 10, 2013 6:43 am Post subject: Compressor |
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`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
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| Posted: Fri May 10, 2013 8:23 am Post subject: Compressor |
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That's a sweet setup Larry.
Mark
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markdavis(at)wbsnet.org
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| Posted: Fri May 10, 2013 9:48 am Post subject: Compressor |
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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
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| Posted: Fri May 10, 2013 10:17 am Post subject: Compressor |
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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
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| Posted: Fri May 10, 2013 10:17 am Post subject: Compressor |
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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
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| Posted: Fri May 10, 2013 10:36 am Post subject: Compressor |
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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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