Message-ID: <37252C79.1029A068@akos.net>
Date: Mon, 26 Apr 1999 23:18:20 -0400
From: Tom Giddings <v35b@akos.net>
To: Lancair Mail List <lancair.list@olsusa.com>
Subject: Cowl Flaps/Cooling
Mime-Version: 1.0

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Hi All: It has been some time since I have been compelled to respond on
any subjects here.It has all been covered so well I have not felt the
need for my minimal knowledge to be brought to the firing line:)
      Having said that I would tell that I have had some LUCK getting to
my goal of  cranking my 360 at full max continuous power on a hot
Florida afternoon climb to altitude  WITHOUT OVERHEATING(yippie)How did
I do this?you ask.WELL sit down and let me continue.

     1.I built a sealed plenum to insure as perfect of a seal for inlet
air as possible.
     2.I built inlet ramps that sealed to the plenum (approx. 10 degree
angle)this allows the air to come in and slow down to do its job of
cooling
     3.I built a dedicated plenum for the oil cooler which uses a 5 inch
NACA duct to get pressure
        air into the sealed plenum then direct over the oil cooler and
directly out the side of cowl via a louvered vent.( it trips the air and
creates a low pressure area which
helps move the heated air away from the oil cooler)
     4.I increased the intake  inlets to 4 inch.
     5.I Installed the 3.5 inch longer motor mount and the larger lower
cowl splash supplied by Lancair as well as the longer cowl itself(more
room behind the engine and accessories case)
     6.I built a shield in front of the #1 cyl to trip the inlet air to
the back of the the pressure chamber.

     The results are as follows;
     1.Full power climb to altitude max cyl temp370(no step climbing)
     2.Cruise cyl temps 75% power 322(all cyl head temps are equal)
     3.8 knot increase in indicated air speed(HONEST)
     4.Oil temps 180
     I am not a rocket scientist.All of these things I did I learned
from talking with other builders and the Factory folks(Don Goetz
ect.)This list has been invaluable to me also.Thanks Marv.
    In conclusion(I see you yawning)I went from an airplane that climbed
at 500 degrees and cruised at 435 to what I have now.An airplane that is
safe and a true joy to fly.

    If anyone would like any particulars and whys and how's feel free to
contact me


Regards Tom Giddings 360TG


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