Given the weight of the 1.60 extra, you would need a 35-45 cc engine for good aerobatics. but again this would increase the wing loading
and make the plane less fun to fly. The Great planes Patty Wagstaff is only a bit bigger and many people use a 50cc in it. The 1.60 glow
engine is alot more powerful than a gas engine of the same size.

I have one of these http://www.cermark.com/products/Cerm...%25-YAK54.html in my basement
still boxed. it is designed around a 28cc engine. I won't start the build until my 50cc plane is completed.