hello guys i have had my speedster now for about a year, and I'm powering it with the Fuji 32 it's about 34cc and will fit completly within the cowl with only a cutout for cooling in the cowl.It will handle the speedster very nice,big even loops and most any non 3-d move is in the Fuji's power band.Oh the best thing of all it balances rite on with no additional weight needed. This has been a great plane to fly,I have thoroughly enjoyed it and as well there Monocoupe to.Great work Kangke!