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Submission + - The Holy Grail Of Infinitely Variable Transmission (

ElectricSteve writes: Ready for a bit of a mental mechanical challenge? Try your hand at understanding how the D-Drive works. Steve Durnin's ingenious new gearbox design is infinitely variable — that is, with your motor running at a constant speed, the D-Drive transmission can smoothly transition from top gear all the way through neutral and into reverse. It doesn't need a clutch, it doesn't use any friction drive components, and the power is always transmitted through strong, reliable gear teeth. In fact, it's a potential revolution in transmission technology — it could be pretty much the holy grail of gearboxes... if only it wasn't so diabolically hard to explain.
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The Holy Grail Of Infinitely Variable Transmission

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