RE: multi-engine 1/2A?
I built a Ace Mach None once with a ceter section 6 inches longer then stock and put 2 Tee Dee 0.051's on it. It flew like a scalded dog. it was almost to fast to keep up with. It would be a nice plane today with throttled 0.061's or even the 0.074's.
Dru.