The Murphy Builders Site

Ted, Did it go to full pressure before turning on the dump valve? Is this
with the overboard dump valve closed?

I think (but am not sure) that the pump doesn't put out full pressure at the
lower RPM, however if the bottle went to full it shouldn't leak back down.
Does it leak down on the ground? I can't remember if Brent mounted all the
valves on the firewall or not but there is a lot of fittings for possible
leaks there. Check valve, start solenoid and overpressure valve would be the
ones that could let the bottle leak (and of course any fitting in between).
The dump solenoid shouldn't really matter as far as bottle pressure as it is
on the pump side of the check valve.

If you go here: http://www.matronics.com/search/

Then go to YAK and enter a search on air system or air leaks you will find
some postings. I subscribe to the YAK list to get M14 info. If you
subscribe and ask a question on the list 99.9% they won't give you the time
of day if they know you are not a YAK though, funny how that works.

Scott
Moose 174

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Ted
Waltman
Sent: Sunday, June 06, 2004 8:33 PM
To: rebel-builders@dcsol.com
Subject: Prop RPM & Air System

In trying a wide variety of power settings today, I found that if I don't
have the prop turning at at least 1450 (engine rpm of 2200) my air system
doesn't stay charged...it degrades below 700+ psi.

Ted
Moose 142SR



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My system leaks down from a max of ~ 750 lbs to perhaps 500 lbs over
about a half hour in flight. I haven't had time to chase down the
leak(s) yet. Thanks for the tips re chasing down the leak.

What I have (what Brent made) is a pump bypass switch so one isn't
needlessly pumping against the dump valve after full pressure is
reached. So, if I flip on the bypass switch, the system degrades over
the above mentioned 1/2 hr or so. Below 1450 rpm it simply will not
recharge with the bypass switch turned off (as it would be after initial
start to allow for recharging the system).

Ted

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Scott Aldrich
Sent: Monday, June 07, 2004 9:19 AM
To: rebel-builders@dcsol.com
Subject: Moose - Prop RPM & Air System


Ted, Did it go to full pressure before turning on the dump valve? Is
this with the overboard dump valve closed?

I think (but am not sure) that the pump doesn't put out full pressure at
the lower RPM, however if the bottle went to full it shouldn't leak back
down.
Does it leak down on the ground? I can't remember if Brent mounted all
the
valves on the firewall or not but there is a lot of fittings for
possible leaks there. Check valve, start solenoid and overpressure valve
would be the ones that could let the bottle leak (and of course any
fitting in between). The dump solenoid shouldn't really matter as far as
bottle pressure as it is on the pump side of the check valve.

If you go here: http://www.matronics.com/search/

Then go to YAK and enter a search on air system or air leaks you will
find some postings. I subscribe to the YAK list to get M14 info. If
you subscribe and ask a question on the list 99.9% they won't give you
the time of day if they know you are not a YAK though, funny how that
works.

Scott
Moose 174

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Ted Waltman
Sent: Sunday, June 06, 2004 8:33 PM
To: rebel-builders@dcsol.com
Subject: Prop RPM & Air System

In trying a wide variety of power settings today, I found that if I
don't have the prop turning at at least 1450 (engine rpm of 2200) my air
system doesn't stay charged...it degrades below 700+ psi.

Ted
Moose 142SR



-----------------------------------------------------
List archives located at:
https://www.dcsol.com/default.htm
username "rebel" password "builder"
Subscription services located at:
https://www.dcsol.com/public/code/html-subscribe.htm
List administrator: mike.davis@dcsol.com
-----------------------------------------------------






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List archives located at:
https://www.dcsol.com/default.htm
username "rebel" password "builder"
Subscription services located at:
https://www.dcsol.com/public/code/html-subscribe.htm
List administrator: mike.davis@dcsol.com
-----------------------------------------------------







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