( Firstly ) - please excuse what might be a really stupid question - but, since I'm new to all of this... I cant help thinking....
Isn't there some way ( even on a very small scale ) to use a combination of a small 2 stroke powered motor ( or a typical RC gas powered engine ) to spin a small generator and thus create power to assist in "trickle charging " - or even powering a quad?
I understand there is a weight issue, but I'm thinking the right combination of ESC and motors ( electric ) and prop size could possibly provide enough grunt to lift the thing.
If this were possible, then using a real liquid fuel would ONLY make the drone progressively lighter compared to the total weight at the start as it consumes its supply of fuel - in the meantime,
While I'm at it - what about using DC to AC inverter technology some how to an advantage in power output?
- Just asking.. lol!
[ there are no stupid questions - the only time a question is stupid, is when you should have asked - but you didn't.]