I have a Byron 1/4 scale Ryan STA, 90"ws approx weight 18-20lbs. Need suggestions for engine, I want a 4 cycle but popular vote is for a gasser, what size and brand would fit? Cost is not a big factor, thanks. Supposedly the 18x8 or 18x10 props are suggested I believe. Bought kit 12 years ago, basically its my first time at this except for a 50" Eaglet