Ken Powell wrote:

Paul,
It was 106 degrees yesterday here in Little Rock and believe it or
not I went flying.  Not a good day to be in a Cessna 150!  Anyway, I
decided that your method of ducting air to the radiator is the best
solution.  I really wanted to try something like Powersport is
using, but it appears that your solution for the RV-4 has a better
chance of success.

Ken Powell

Ray is up there in Wisconsin in the cool part of the US. Wait till he hits 
the south and the  deserts out here in CA and Arizona :-)
Between his offset gear box and the RV6A nose gear there is little room
under the rotary for an oblique radiator. In that case two large area thin
rads vertically mounted on either side of the engine seems to be
the best choice. Similar to what Jim Mosur is using. Then he would get
cool air at all times. Even a ten or fifteen degree increase in
temperature of the air going through the rad (such as happens when the 
air goes by the engine first) can make a difference. That is a ten or 
fifteen percent reduction in heat transfer between the rad and the cooling 
air. You only start with a 100 degree difference at low altitude in 
the first place. That means more cooling air is needed 
and the aircraft has more drag. Well in any event we shall see when 
he runs the race :-) 

Rumor has that Dave Atkins is putting on a turbo charger and will 
also run the race. That would make it really... really interesting :-)
I know Dave has racing in his blood.

BTW Robin showed me this T-shirt that says: "If you don't agree with me you
would be WRONG!" :-)
 
Paul Lamar
 
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