RE: Flite Streak/CL engine questions...
The Flite Streak is more like a combat plane than a stunter: can be tuned for very quick lap times, very quick turns. I have an old Veco .29 on mine, and it screams. That's not to say that you couldn't slow it down with a smaller engine or richer setting, or as you say, limit the throttle on an R/C engine.
The one wheel is for landing. The Flite-Streak is intended to be hand launched.
The other thing with this plane is the balance point. If you balance it 3.5 inches behind the leading edge, as the instructions with the ARF say, you will have a wicked handful. I think most fliers recommend 1.5 to 2 inches behind the leading edge, at least to start.
Good luck,
Phil