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Old 08-11-2016, 01:52 PM   #6 (permalink)
freebeard
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Here's an entire drivetrain that's not much more complex:

http://www.zf.com/corporate/en_de/products/product_range/cars/cars_electric_twistbeam.shtml

They're recovering <1hp. The gearbox and alternator could be replaced with piezoelectric/triboelectric crystals.
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