This is a good start for speed, without breaking the bank....$189.00
from Morris Hobbies....nothing extra to buy....or fiddle with. Just bolt
it on and go ! The Rossi .40 Quickie engine.....

....here's what they say about it....

Q500 Rossi .40 inlcudes backplate mount and Quickie silencer. No porting
or mod's needed, just bolt this engine on your Q500 Airframe and you are
ready to compete against MVVS Q500's and Dub Jett's Sport Q500's in the
"District" Class. Turns above 18,000 rpm's in the air with an APC 9x7! For
use on a closed course for competition purposes. Also used when extra
power is needed for heavier jet-like planes or when high speed applications
are required. Bolt this engine to the forward swept V-Tail V-VECTOR Q500
Race Plane and bring home all the trophies in your class! For expert flyers only.
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I would think about one of these....just to get the hang of it....then maybe
later going with the full blown Jett, or Nelson racing engines. When you plant
one of those racers at 150 or so....the engine is usually busted in half....[X(]

Dave.