RE: sig Smith Mini plane engine& covering?
The plane is rated for a .40 -.46 2 stroke.
I guess that would equal about a .50 - .70 4 stroke..
I plan on using the RCV .58CV in mine.
As for covering, what ever suits. I'll probably go with a 'Monokote' (Ultracoat actually) covering, as it's easy, and I've done many many planes with it before. I'm also entertaining the thought of 21 century fabric. But so far, haven't really found a local source for it..