migfighter42(at)gmail.com
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 Posted: Tue Apr 07, 2015 12:34 pm Post subject: Yak-List: Re: Air Leak Advice |
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My 1992 Yak-52 will not start on Nitrogen, period. The 1985 of which I own a part (not sure why) will start on N2. I learned this the hard way one weekend when we ran out of scuba air and used N2 that we normally use in the MiG/L-29. Nothing, nada, kaput! At first we thought it was a ignition issue, but it came on too suddenly. We swapped the N2 for breathing air in the hanger and all the aircraft play nicely now.
To the comment of the valves being closed, most high performance engines have both valves open during part of the normal compression operation (overlap) because the velocity of the incoming gas and the outgoing gas separates the pre and post burn volumes of air. When starting at a low RPM, it is possible to get enough N2 into the cylinder to cause a no-start.
As explained by Dennis, some M14’s inject N2 into the cylinder that the “shower of sparks” is used. Some do not. I suspect that Dennis will chime in at some point on the issue.
Bill
Sent from Windows Mail
From: Michael Wikstrom
Sent: ‎Tuesday‎, ‎April‎ ‎7‎, ‎2015 ‎3‎:‎15‎ ‎PM
To: yak-list(at)matronics.com
--> Yak-List message posted by: "Michael Wikstrom" <michael(at)wikstrom.cc>
Hi
I can confirm that the M14P starts perfectly well on pure nitrogen. On a few occasions I've emptied my normal bottles and
the only thing they had at the airport where I was (Trieste in Italy) was nitrogen. My standard bottle was completely empty and we filled to 50 bar with nitrogen
and it started immediately.
Michael Wikstrom
Yak18T
France
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