I used a scroungy OS 46 FX... I bought it from a guy that crashed it and bent the crank and broke off the needle valve... I got a used crank for $15 and I JB welded the needle valve on.... Runs like a top!!! I tried a pletora of props on it... I liked the 12 x 4 apc sport prop the best... spooled up faster than the 12.25 x 3.75 and it had better pull that the 11.5 x 4.... Lots fun!!