I had to use a power 10 in my showtime it really increased the vertical performance i mean like straight like a space shuttle after the 10 foot leap into the air. i had to add ounce or two to the tail. Since the wing spar wouldn't let me slide the batttery back farther. You will really enjoy it. I used 12x6 apc prop. You will have to drill the hole out on the firewall so the motor can fit.