A series of gears on two other axes convert the torque from the hand crank into the high speed necessary to get usable electricity out of the generator. The separate gear shafts were necessary to ...

The best hand crank radios can generate power manually, without electricity or external batteries, but not all hand crank radios are created equally. Depending on the quality of the radio ...

This compact $28 hand-crank power generator features a built-in flashlight, USB charging port and solar panel, making it a must-have for blackouts, camping trips, or anytime you’re off the grid.

16 Would you want to use a hand-crank to charge your phone every single day? Definitely not. But hardware hacker Ben Heck's clever hand-crank mobile charger could certainly come in handy in those ...