How to Create a Hand Crank for 24000rpm DC Motor

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Creating a hand crank for a 24000 rpm DC motor is theoretically possible but practically unfeasible. The required gearing ratio to achieve such high speeds from a hand crank would be around 1:400, which significantly reduces output torque. Most hand-crank generators use motors that operate at a few thousand rpm, typically requiring much lower gearing ratios, around 1:20. Achieving 24000 rpm with a hand crank would demand impractical physical effort and design. Therefore, while the concept is interesting, it poses significant engineering challenges.
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I want to create a handcrank to spin a DC motor at 24000 rpm. The DC motor is an 18V hobby motor from radioshack. Is this possible?
 
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Possible yes, practical no.

You'll never be able to crank it fast enough with practically sized gearing.
 
If you figured you would be able to spin a hand crank at about 60rpm (1 rev/sec), that means you'll need a 1:400 gearbox to step up the speed (and it will reduce your output torque by a factor of 400 as well). My guess is most hand-crank generators utilize a motor which spins at a couple of thousand rpm at most, meaning the gearbox is on the order of 1:20 or so.
 

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