Should also mention it's important to follow the manual on the break in on those, it's different than your typical ABC engine. Otherwise you risk blowing a head gasket or worse, bending a rod. Should also note it's easy to flood these, like most gas engines, and electric start on a flodded engine is a no-no. But once broken in an set they are pretty much a no brainer. Mine has become my go to sport flying plane. Fly all day for pennies and they don't seem to be as fickle about temps and humidity. An APC 11X6 for break in and sport flying and a 10X7 for a hotter plane.