Well for cooling drag purposes people tend to reduce the exit air
to squirt the air out at higher speeds providing a bit of thrust
that mitigates the over all cooling drag. In the P51 some claim
it actually added net thrust.

This is a subtle change but it improves the transition from the
air intake to the wedge diffuser. I think the cosmetics are
also improved slightly. The left side could be partitioned off for
oil and intake air. Two high flaps on both sides of the cowl
just in front of the wings might work wonders.

I know a guy with a large NC mill that we might talk into
making a foam buck. It would be done in large pieces 20 by 40 by 20
or so and then assembled at your place. The NC mill program takes
30 seconds to enter using a Rhino file. What is the height and width
of your firewall?

Paul Lamar


Paul, not sure if this is me your refering to. If it is, I'd be glad to help out
by machining the buck's. Currently working on a cargo mod mold for
a super cub [production mold]. Btw I know you asked me to send pictures
and I'd forgotten to until reading this. I don't have pic's on this PC as I'm not
currently at home but I've got a link to a Youtube Vid of the machine cutting
it's spoil board, it gives a glimps of the size of the thing..

Btw, if it wasn't me you was referencing to.. no worries just wanted to let you know
that I was interested  :)

That link to my machine is :

http://www.youtube.com/watch?v=nQytmfvUc7M
{thats cutting the spoild board [wood base of the machine]}

http://www.youtube.com/watch?v=vQSdxaGOG5o&feature=channel
{thats cutting an aluminum panel/fill plate. I was using too long an
end mill [just what I had that night.. should have used something 3" long
not 6" like that.. but t'was all I had right when I needed it] and it was
vibrating a bit, sounds scarier than it really was :)}

Best

Jarrett