The supercharger wumpus described, the Thomas Knight kit, made around 7 psi of boost, giving an additional fifty to sixty horses (forget exact figures, it's been a looking time) in very short bursts on a big four pot motor.
Took 15 HP of hand-wound, exotic high-speed electric motors to run. And the batteries only held thirty seconds of boost. An actual clutched supercharger would probably be better. Simpler, too.
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