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richard.goode(at)russiana
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 Posted: Thu Sep 17, 2009 8:14 am Post subject: Engine intake shutters |
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Engine intake shutters
As a principle I think that it is a big mistake to remove the shutters.
Obviously without them, you have the relatively small inconvenience of a longer warm-up time, but the real problem is that of excessive cooling in descent. If, coming from cruising altitude to land, you will definitely over-cool the engine, unless you keep a lot of power on all the way down which is not really what you want to do.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Herefordshire
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340 120
Fax: +44 (0) 1544 340 129
www.russianaeros.com
[quote][b]
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mark.bitterlich(at)navy.m
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| Posted: Thu Sep 17, 2009 9:34 am Post subject: Engine intake shutters |
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In principle, I agree (as well) that it is a big mistake to remove the
shutters.
That said, I have 900 hours on my M-14P running without shutters.
I also have put the thermostat back into the oil cooler which
SIGNIFICANTLY reduces warm up time, although it comes at a price.....
That being no oil by-pass valve if the oil cooler somehow becomes
blocked! Of course another plus is that oil is not SLAMMED THROUGH the
cooler when it is cold and thick as sludge. There are of course pro's
and con's to doing anything and it ends up being a balance of choices.
I got my YAK-50 without the shutters, and it would have been a massive
project to put them back in. Not knowing any better at the time, I just
flew the airplane. On the 50, the front cowl ring is actually
stabilized by those shutters, so with them removed, vibration ended up
causing damage to the cowl support ring, and eventually the cowls
themselves. This was corrected by adding four additional support rods
running from the engine case out to the cowl support ring, using the
original studs that held the shutter control ring. This corrected all
the cowl support issues, and has been done by others as well, with some
very nice designs along the way.
No arguments about the dangers of rapid descents at idle from altitude
and the danger of shock cooling. Knowing that, you need to keep power
on the engine and keep the cylinder head temp at least in the yellow!
Not hard to do though.
Perfectly working shutters are great... And I love em. However,
everyone also knows that it is pretty darn easy for those shutters to
jam, and if they do that when they are closed and then you have to run
power to get to the closest airport, you can end up COOKING the engine,
which causes just as much damage as shock cooling. This has actually
happened to more than one YAK owner.
Bottom line... Maintaining perfect engine temps will obviously extend
the lifetime of the engine. My YAK-50 has run it's whole life (with me
anyway) not having them and is still running GREAT, with good
compression. But... I take care of it and am cautious ... And have
learned how to operate it without the shutters. I also do not fly it
much when the temps go below 38 degrees "F" or so.
Mark
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