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Expert Tip Select the dirt bike helmet with quick-release visor mechanisms for easy removal and replacement
Besides replacing a helmet that they've grown out of, you should always replace a helmet that's been in a crash, which involves a head impact
Allen, Human Power (Fall/Winter 1991-1992) Design and development of a human-powered machine for the manufacture of lime-flyash-sand bricks, J.P.Modak & S.D.Moghe, Human Power (Spring 1998) Human Powered Flywheel Motor: concept, design, dynamics and applications, J.P.Modak, 2007 Modern mechanism: exhibiting the latest progress in machines, motors, and the transmission of power, Benjamin Park, 1892 Make electricity while you exercise, Mother Earth News, 2008 Luthers tool grinders (pdf, 5.8 MB), hand and foot powered grinders catalog
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