Hey guys im working on an rc ultralight, the engine i am using is going to be in a pusher setup. I would like it to also have a recoil starter. So I have decided to use an rc car engine for power and lightweight heatsink head. I was wondering if anyone had any experience in this. I dont know what props I can use with a .21 size engine. And what rpms I have to look for, temp. etc... spacers can be machined to accomodate the prop. So anyone with suggestions. would def be appreciated.

mike