I know this post is a little late. I have the WM clipped cub 48 as well. It started with a .40FP. Best prop for it was the 11x3 APC. Not enough power. Put in the thunder tiger .46Pro. I ran that with the 11x5. It was a good combo. I think for the .46LA the best prop will be a 11x4. It should allow a great climb rate. I just swapped out my TT.46pro for a o.s. FS-61 four stroke. Really I think the .46pro was a tad more powerful but just barely. I love the putt...putt sound of this fourstroke though. It was worth it.