ORIGINAL: abufletcher
For a biplane with only a 59'' wingspan (1.5m), I'd say a 90 FS is way too big. Something like the Saito 56 (or the 62) would fly it beautifully.
I'll see if I can find some proper engine then. Does the hobbycity nitros work good? I see they have a nicely priced .60 fourstroke.
ORIGINAL: abufletcher
With that nice thick airfoil, I'd definitely put the aileron servos in the wing...unless you just want the challenge of figuring out a closed-loop cable system.
Oh, and I'd go ahead and put the sheer webs in each wing bay (though they shouldn't be needed in the outermost parts of the wings.
Yeah, I think I'll be mounting the servos in each wing with the arm sticking out through a slot. That's pretty close to how it looks full scale, and should be easy enough to do. There really is plenty of room there.