I really like the 4 strokes in the GP CAP232. I first flew mine with the YS .53. It flew very well, but I wanted just a little more power, so when the YS .63 came out, I went with it. Beautiful combination, and with the factory muffler all inside the cowl, pretty quiet too! I also think the Saito .82 would work well. If you do go with the .46 2 stroke, I would concur that you might want to go with the lower pitch props to keep thrust up, and all out speed down. However, the 12 1/4 x 3 3/4 prop seems awfully low on pitch, I wouldn't want it slowing down TOO much when you slam the throttle shut!

Lee