I built two of the older version GP Viper RTCs before they were discontinued (the low-wing version) and was pleased with their performance. I never raced and don't plan on it, I just like to go fast. For sport used on a Viper or something similar, would I be better off going with a Jett . 50 or his Q-500 engines? Would their be any way to shoe horn a FIRE on it? Also, I don't know much about QM 40 models, but they look pretty cool. Can anyone tell me more ie. speeds, flight characteristics, where to get them?

Thanks for all the great info guys.
May your spins be flat and your landing gear attached.