Regenerative Hybrid Electric Plane Concept 01

Hybrid electric planes... motors are there anyway, now why not add regenerative turbines.... like electric cars regenerate from braking, so can a plane generate electricity from motion, mid air. Can even feed the engine flow output directly into the turbine behind it...

could the falling of mass not power extra turbines? if you close the turbines off, or tuck them in during take off, and climbing, yet open them up during falling, (what goes up, must come down, somewhere) you could generate electricity from falling, or during gliding from the highest point as the mass is already in full motion (energy expended) and on a preferred height thus will fall inevitably down, regenerating power conditionally as not to interfere with the normal plane function, at no extra energy cost for flight itself, if designed and used well. use the great insight and foreknowledge that all mass falls down to your advantage, timed. like a car that brakes and regenerates, so could a electric plane fall and recapture axle rotation that we could store and re-use saving on fuel economy.