thank you!
I even thought about using a big RC airplane engine
I am building an electric helicopter (drone) and want to recharge the batteries in-flight
Any engineers here want to get in on the ground floor of a new company?
But the concept of a motor-generator in a quad copter is intriguing, and I'm sure it's been done before, but since it isn't commercially available, there must not be enough duration or payload to make it better than a LiPo powered quad copter.
As for just a glow powered helicopter, heck, there are literally thousands to choose from on the market already.