X-Mozilla-Keys:                                                                                 
RJohn15183@aol.com wrote:

rotaryeng@earthlink.net writes:

If the total intake area of my cooling system (radiator plus oil cooler)
 equals this small area I will be very happy indeed.

Whenever I feel down about cooling area or even cooling a high output engine
I always think about Indy cars. Little 1 and 2 square foot radiators cooling
1000 hp engines with very little drag OR weight penalty. Lovely! (It's all in
the ducting!)

They have about the same airspeeds to work with that we do but a lot more HP
to keep cool!

Rob

There is four times the dynamic pressure to work with at 200 MPH
then there is at 100 MPH. Dynamic pressure = 0.0026 X V^2.
V is in MPH. Dynamic pressures is in pounds per square foot.

The four times more pressure is the main reason you need cowl flaps.

We climb at full power for tens of minutes at 
100 MPH  while an Indy car goes from zero to 200 MPH in seconds
and only a few times during the race. They have a much easier 
time of it. 

Out here in the West when taking off from the low desert at sea 
level or below, at 110 F and climbing over 12,000 foot 
mountains against a head wind I have climbed for as much as 
forty five minutes WOT in the C182. Yes the power is down
but so is the air density needed to cool.

Paul Lamar
 
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