What do you have against the looks of this airplane Jerry?

I've looked at this photo many times. It looks very good to me.   How is it
cooling? How big is the radiator? Do  you have a pic with the cowl off?
Jerry

Jerry,

  I never saw the Powersport RV4 in person but did look Alan Tolle's RV3
over pretty carefully. In the RV3 there were 2 rads and an oil cooler, all
the same size, made by Griffin I believe. Cores roughly 12" x 12" x 2". The
coolers were arranged in a U config near the bottom rear of the cowl.
Coolers were baffled to the firewall and relied on pressurizing the entire
cowl. I saw the airplane fly at Copperstate (Phoenix, Az.) in 100+ degree
weather and can confirm it cooled very well. At least based on demonstrated
performance it wasnt cooling limited.

  The RV3 used an annular inlet cowl which also looked pretty cool. It had
an open exhaust (no muffler) but didnt seem overly loud to me. The RV-4
used an exhaust augmentor which reportedly worked very well, but again,
never saw that. According to Alan the RV3 cowl config was a little cleaner
and the airplane was a little faster than the RV-4 with the exact same engine.

  There were articles in Sport Aviation and Kitplanes complete with
pictures of the firewall forward installation in the early to mid 90s if
you can find back issues. I think I have them but would probably take a
while to find them.

Mike Wills

 
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