Motor12, I suggest a 16x14 APC prop. That will give you good speed and about 80amps full throttle. If you want more speed, cut down a 20x15 electric apc prop to 16x15. You will get about 80 amps full throttle, but more speed. And if you really want to get crazy, use the 16x16 apc prop. That will draw a few more amps, but you get even more speed.