Yes! So this proves the point that the number one item on the recipe list for going fast is HORSEPOWER. Quickies are very inelegant airplanes. There's not much that can be done within the rules that'll clean them up. Oh yes, we do what we can--hidden linkages, gapless/skin hinges on top of the surface and sealing the hinge gap on the underside, sharp trailing edges and the like, but the plane is still just a box. The Bird-of-Prey in my avatar pic will do 110-115 mph with a Thunder Tiger .40 and an APC 9 X 6 prop turning 16.5k. The same airplane will go 150-160 mph with my Jett BSE Q500 motor on an APC 8.8 X 9.25 turning 19.4k

BMatthews too is correct. Take that same motor, (Jett BSE Q500) change the timing and shorten the pipe so it'll swing a smaller prop at 23k to 24k, put it in a Q40, a MUCH cleaner and more streamlined true racing plane, and you'll gain 20 mph.