I'm with all of you about the 4 stroke on a warbird. BUT both them came ready to fly (so they say) with the 2 stroke, and both of them are proven packages with the engines they have. I'll probablly fly them for a bit, see if I like them, then think abou t a 4 stroke. The P-39 would be a perfect candidate for an RCV engine... if I could figure out cooling.

Andy