The kit builds very quickly, much like the Sig Kits do. A .61 will fly it OK but I would probably go with a .75/.76. I am running a Tower Hobbies .75 in mine now after initially breaking in a GMS .76 in it. I use this airframe as my .61-.91 2 stroker break in plane. Both these engines are reasonably priced and mine both run awesome. It is a fantastic flying/landing plane. I built mine as a taildragger and love it. Whatever motor brand you choose will be fine, but just consider the .75/.76 size for this airframe....you won't be disappointed.

Curt