While I was at the Sebring show today I found the air cam cooling
system to be rather odd but interesting. It's a twin pusher with the
radiators on the top of the wing and a NACA duct feeding from the bottom
of the wing. My question is this a efficient or good way of ducting air
and getting real good cooling results?

Tom/norpro

If I have to use a NACA duct the bottom of the wing is a good place
for it as it is a high pressure area. It all depends on the rad core size.
Obviously it works for this airplane.

Paul Lamar