I think you might want to join our group where we work together on this stuff.
Here this fantastic man has it all done for you, Plug and Play!!
hope these links make it through!
"gas motor add-on and make a 'hybrid' but still haven't been able to make the Ardruino and gyro move the servo for the throttle fast enough"
oh you mean like wearing a gas generator?
That's a pretty old school idea given how you could get all the energy you need from modern battery cells with less weight and much less danger of fire potentially.
Cool idea though! I would like to see it attempted