An OS 160 will be perfect for scale aerobatics but would be lacking for 3D. The plane at 13 pounds will slowing pull out of hover, not pull out quickly. If you want to 3D, better get a Moki 1.8 or 2.10. The plane is strong enough to take it. I think a gas engine for 3d will weigh too much for good slow flight. We will see. I am going to install my OS 160 and fly scale.

If you want to go 40-50cc gas get a Patty Wag Extra for $20.00 more.