So how many watts does it take to make the engine sustain itself?
I had an idea to convert an engine (not sure which one... or really how, but that's the futures problem) to power a fan, then convert the fans output into energy via wind power and thus sustaining itself for extended use.
After that I will need to find out how much force the fan produces and how much weight it can lift off the ground, resulting in the number of fans/engines I will need. These answers will inadvertently make or brake the follow through of the concept.
Any help or advice is very much appreciated,