Chad, you and your friend may want to look at this power set-up first. Jim makes different sizes for specific installs. I plan to go with one of these myself for a P-51 1/5 scale... stingrpower.com

Here's another group's thread on his stuff... StinGR - Mega Power for Electric Giants

And, there's a video on the last page of a recently completed Spit & StinGR set-up. You can fly a scale prop with this! Sorry, I don't have enough posts to send urls!