Yes Chuck, that's why I'm setting it up this way, I raced Oct/Nov with them this year. What a blast! The new one is going to be .25 only, the battery will be up front, and a few other things changed, and I'm hoping it will balance. My other Viper has the Dave Brown mount screwed to the back plate, and I can change out to the ST .45 by sliding the battery back a little. Now if I could just figure out what is a good RPM number for these FX's, and the best prop/fuel, I'll be good to go!