You are gonna want around 3000 watts.... Extreme Flight has power setups for their 74'ish inch planes that will fling around a 10 to 13 pound plane pretty well....
Usually 10S and 12S SETUPS.....
Hacker C50-14XL with a 22 x 10 prop on 10S will 3D even a 14+ pound plane
Hacker has several large outrunners that are characterized as 50cc equivalents...