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HBaker
Joined: 16 Nov 2008
Posts: 119
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 Posted: Sun Feb 08, 2009 5:56 am Post subject: Air start |
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I' m hooking up the air start an was wondering about the water trap and the solonoids Is there three of these , one on the air start, one on the Isolaion valve and one on the water trap, are you hooking up the water trap with some kind of a colection ,loop or container before the valve? And 2 of the the valves are normally closed and one open?
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george(at)gesoco.com
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| Posted: Sun Feb 08, 2009 6:27 am Post subject: Air start |
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Usually you exit the air compressor with some steel line. Put a loop or two
in it for vibration isolation and some cooling to condense the water and oil
vapors. It then goes to the water trap. From the water trap it usually goes
to the air system through a check valve. The pressure bottle is usually
isolated with a manual valve so you do not loose pressure while the aircraft
is parked. The start valve is hooked to the system and is either
electrically or mechanically activated. The electrical valves can have some
problems as they sometimes gum up with the oil residues that are in the air
system. Many of the eastern aircraft used a mechanical valve. This had the
advantage that once thrown it left both hands free to work throttle, primer
magi switches etc.
If you go to the instillation section of the M14P engines on our website at
motorstarna.com you will see a sample system schematic. There may also be
some other useful information there as well.
George Coy
Motorstar NA
714 Airport Rd.
Swanton VT 05488
802-868-5633 off
802-363-5782 cell
george.coy(at)gmail.com
SKYPE george.coy
motorstarna.com
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yakplt(at)yahoo.com
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| Posted: Sun Feb 08, 2009 1:59 pm Post subject: Air start |
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A comment on design if I may. The original Yak design used a steel line with loops in it as George described. With later models, they used a steel line, a few loops and then a steel braided line connected to the end of it which then connected to the water trap. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
Sukhoi designs simply used a braided high pressure steel line and never bothered with the hard steel line (loops or no loops).
My YAK-50, plus two YAK-52’s that I know about have had problems when using a solid steel line, with the loops, connecting straight to the water trap (snot valve). The reason is fairly obvious. The engine moves in it’s shock mounts (rubbers). The snot valve is connected to the firewall. As the engine vibrates, this steel line has to flex and move with it. Over time, it is going to fail.
Bottom line, in my humble opinion, lose the steel line and replace it with a steel braided flex line. Or…use the steel line, but have a piece of braided flexible line between the steel line and the snot valve. On mine I managed to get the
There are two models of start valves. One has manual capability, one does not. If you can find an old one that does not work, you can take the new model and steal the parts out of it to repair an old one so you do have manual capability, which is a very good thing to have as George points out.
Mark Bitterlich
From: George Coy <george(at)gesoco.com>
To: m14pengines-list(at)matronics.com
Sent: Sunday, February 8, 2009 9:25:58 AM
Subject: RE: M14PEngines-List: Air start
--> M14PEngines-List message posted by: "George Coy" <george(at)gesoco.com (george(at)gesoco.com)>
Usually you exit the air compressor with some steel line. Put a loop or two
in it for vibration isolation and some cooling to condense the water and oil
vapors. It then goes to the water trap. From the water trap it usually goes
to the air system through a check valve. The pressure bottle is usually
isolated with a manual valve so you do not loose pressure while the aircraft
is parked. The start valve is hooked to the system and is either
electrically or mechanically activated. The electrical valves can have some
problems as they sometimes gum up with the oil residues that are in the air
system. Many of the eastern aircraft used a mechanical valve. This had the
advantage that once thrown it left both hands free to work throttle, primer
magi switches etc.
If you go to the instillation section of the M14P engines on our website at
motorstarna.com you will see a sample system schematic. There may also be
some other useful information there as well.
George Coy
Motorstar NA
714 Airport Rd.
Swanton VT 05488
802-868-5633 off
802-363-5782 cell
george.coy(at)gmail.com (george.coy(at)gmail.com)
SKYPE george.coy
motorstarna.com
--
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