The chord of the channel is 3 inches and the AA prop just barely
fits inside. Any warping and it would hit the sides.

I've been wanting to build a twin boom for some time now. Hoping
I can make one quickly.

Speaking of balsa chuckers. I just got a 1942 Model Airplane News
mag on ebay and in it they have the plans for a bipe that flys with
no stab. Just has a rudder. Tailess Bipe or Mono?
Would be great for the AA.
I'll post the complete plans for it later tonight.