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hydraulic regen
I was planning on an electrically activated clutch from an AC pump run off the brake light circuit to kick in the wheel driving fluid up against an accumulator, the small gear pump I have can act as motor using the stored pressure for takeoff using a small control lever/valve in the cockpit. I originally thought it would be good for a trailer but it has been done with higher efficiency as a drivetrain for a car before and patented too even variable torque/power has been done with a vane style pump with a warpable membrane that pumps variable volume. 80% efficiency has been done.
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