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From: "Steve Brooks" <steve@tsisp.com>
To: "Fly Rotary \(E-mail\)" <flyrotary@lancaironline.net>
Subject: Re: New Scoop
Date: Wed, 14 Jul 2004 15:46:38 -0400
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>oil temp up to 217 coolant about the same.
>Speed only about 120 kts.  Didn't retract the nose gear.
OK. If you retract the nose gear, does it go down a few degrees? Mine does.
Now if you're cruising faster at, say 160kts at 5000ft with the gear up -
how does it cool now?
Raising the nose gear does increase the airspeed by about 10 kts or so, for
the same power setting, which should improve cooling.  I haven't really
tried this, but it would be a good test.  Fastest I've been is 150 knots.
My ailerons are marginal on the balance, and I've been real careful not to
push it too high. I had to add additional weight to the front of the
aileron, and it still just barely makes it level (almost). I am going to
make new ones out of carbon fiber, to save weight, and I hope that they
balance better.  My elevator is already carbon fiber, and very light.
Were not comparing apples & apples. My gear was up. I climbed slowly
(1000fpm) to 5000, then on to 11000. I'd bet you're temps wouldn't be much
higher if you did the same flight.
I haven't got up to 5000' yet.  My engine would probably melt down before
then.  I think that about 3000 is as high as I've had it.
.
I'd say the biggest difference between our installations is the exhaust
augmentation / turbo / exhaust shield setup. Very little of the heat from
turbo & exhaust gets to stay in the cowl.
My temperature inside the cowling really hasn't been too bad.  That's the
one thing that makes me wonder about the sensor accuracy, because when I
land, the engine doesn't seem to be hot, and the top of the cowling is warm,
but not so hot that you can't set your hand on it.  The first couple of
flights the cowling got really hot, but not any more.
Sorry to harp on this Steve. I just have a feeling that you're working hard
to get the temps lower than they really need to be. If you want minimum drag
at cruise, then the temps SHOULD be marginal on a hot day take off and
climb. So... get the gear up and back off the throttle till you get in
cooler air at cruise speeds. If necessary give it a rest half way up, or use
the technique of doing a long approach to cool off before climbing that
someone described. If it'll cool ok at full power at cruise height, then
you're in good shape. My 2c.

We're supposed to get a break in the heat in a couple of days.  Maybe I can
try Saturday morning to make an extended climb to some cooler air. Certainly
is worth a try.  I should have my new scoop ready by then as well.  You'll
be happy to know that this scoop, as well as the existing one, is a "bolt
on" to the existing one.  I can remove it in less than 5 minutes.  It may be
that I have to run it in the summer, but that I can remove it altogether in
the fall winter and spring.  I guess that I won't be able to race you in the
summer.
Steve