hi west6008,

I fly .25 powered Maac Scale Combat. A couple years ago my buddy 'Iceman' built a Polikarpov I-16 at 40in. span. It had an O.S.FX with a MA 9-4 (might have been a 10-4) The cowl was 8 inches diameter ! The front was basicly a flat plate with a cutout for engine cooling from 11-1 o'clock. The back of the prop was about 1in. in front of the cowl.

Some of us thought it would never work...but it did ! It flew fine. Obviously not at fast as the the other WW2 fighters we fly.
He built it because it was the hardest WW2 fighter to build and fly...

You should have no problems blocking off the front of your cowl from 1-11 o'clock. Make sure you have cooling air exit holes in the back end of the cowl bigger than the intake area.

Good luck with your AT-6.

I like small handlaunched WW2 Warbirds. The 'permanent' retracts are lighter (and cheaper!) than fixed landing gear !

Take care,
Have fun,
Dave'crosscheck'Fallowfield
Maac 6437
Unabashed Combat Team
Oakville, Ont. CANADA