I've got a YS 91 AC on mine.... swinging a 13/12 ..... I've got it set up with 2 deg. of Right thrust and 2 deg if down thrust.....seems to be the best setup I've found. It's fun.... I need to get a taller landing gear so I can swing a 14 or 15" prop and then I'm sure it will be really fun.... This little plane is plenty strong for these engines you'll have a blast!!