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brian-1927(at)lloyd.com
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 Posted: Sat Sep 22, 2007 11:46 am Post subject: Back to Tim's problem (was: Bernoilli, His Equation, Air Mov |
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On Sep 22, 2007, at 11:53 AM, Tim Gagnon wrote:
| Quote: | pattern, gear down off the perch, big pressure drop (same pressure
drop) and gear thumps nicely. Land with about 25 atm in the
airplane. Run up, pressure builds back up to 40 or so, but did
something new this time....hopefully not unsafe.
Brakes on, run up to 70% for about a minute, pressure builds to
about 40, then I SHUT OFF (engine still running) the main valve and
the pressure builds to about 55 ATM and I shut her down.
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One comment. Everything is working but you are getting a big pressure
change with gear actuation and a rapid pressure recovery. If you had
a leak, the pressure would keep going down but your pressure comes
right back up again. That says to me, no leak. The big changes in
pressure also tell me, small volume. Check your tank. Something is
taking up a lot of space in there and leaving you with very little
system volume.
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
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Scooter
Joined: 10 Jan 2006
Posts: 155
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| Posted: Sat Sep 22, 2007 1:37 pm Post subject: Re: Back to Tim's problem (was: Bernoilli, His Equation, Air |
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I can't recall how the Yak-50 air system is set up... If this were a 52 I'd almost think (going under Brian's theory) that the main and reserve bottles were swapped. This would account for a big pressure drop when turning on the main valve and quick recharge. But it's probably unlikely the reserve tubing was mucked with.
Other guess would be a variable leak downstream from the main valve. If this were the case then it would appear to seal up a bit as pressure was applied - but not completely - and is not allowing anything over 40atm. If it were a bottle swap as in the first case then you'd still get the 55atm. I'd bet on the leak. You should get this Bernouilli guy to check it out.
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talew(at)bellsouth.net
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| Posted: Sat Sep 22, 2007 3:55 pm Post subject: Back to Tim's problem (was: Bernoilli, His Equation, Air Mov |
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Water?
Terry
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brian-1927(at)lloyd.com
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| Posted: Sat Sep 22, 2007 4:06 pm Post subject: Back to Tim's problem (was: Bernoilli, His Equation, Air Mov |
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On Sep 22, 2007, at 4:54 PM, Terry Lewis wrote:
Ah! I was trying to think of something that might be in the tank
taking up space but couldn't think of anything off hand. Water would
do it.
But as I said before, Tim needs to look everything over really well.
Something's rotten in Denmark. We are just guessing right now and
while I think my troubleshooting is well reasoned, it doesn't take
the place of actually going to look.
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
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