I am working on an older kit, an Ace 4-120. It has an 85 inch wingspan and the box says it will weigh 13 pounds - pretty heavy for today's standards. I have a 25cc gas engine I was going to use, but I have been interested in the RCV engines and started thinking of getting one for this plane instead.
Would the 120 be the best choise? Would the 90 fly it? I don't care about going straight up or having excessive power, so long as it can loop and roll easily. The kit was designed for 120 four strokes. Thanks Jim S.