Hi All. Just read your suggestions on an engine for a 1/4 scale cub. I`m just about to start building mine from a Mike Smart design (UK designer) Its an L4 modified from a J3 plan. Trust me the ONLY engine to use is an OS 120 four stroke swinging an 18 x 6 prop. Forget your gas engines. we just call them "petrol" engines over here !. ALL of them are TOO BIG. It really is a case of size doesn`t really matter ! The sound of an OS is music to an aero modellers ears. I have thought long and hard about this engine and decided the ONLY way to do it is to use the OS and create two dummy cylinder heads behind the real ones to represent the Continental C65 engine of the original. This combination will give sound and presence in abundance. What do you all think to that ?