I had a Rascal a couple years ago with a Saito .56 on it. It's the perfect engine for that plane. I tried a .46 2 stroke and no comparison to the 4 stroke. It flew great and done some of the prettiest knife edges I ever saw. At idle it would putt putt down the runway at walking speed. It was a real joy to fly. A little headwind is almost a must to land one. It glides forrrrrever. It doesn't like crosswinds at all but it's manageable. It has a VERY efficient rudder so crosswind landings are done "crabbing" it in. The downside is the extremely narrow fuse (it's hard to get your hands in to work on it) and I'm not crazy about the engine mounting rails. If the blind nuts come out of the mounting rails they are a pain to put back in (ask me how I know). I made up some new curse words and was talking in tongues before I got new ones in. The stock aluminum engine mount plates break easy. I made new ones out of better material. Outside of those minor issues it's a wonderful plane. I sold mine to my brother.
I'd buy another in a heartbeat.
WCB