View Full Version : Cranking and gripping

Peter Slob
05-28-1999, 05:55 AM
Dear BIOMCH-L readers:

I知 a student at the Delft University of Technology, at the moment I知
graduating in Industrial Design Engineering under the supervision of dr.
ir. J. F. M. Molenbroek. My graduation project is the Human Power Chart
(possible output power given a specific movement and a specific
conversion system). I知 focusing on two specific movements: arm cranking
and gripping. I have chosen these two movements, because they are the
most common movements for charging consumer product. I have search all
over including the BIOMCH-L archives, but I could not find anything
about comfortable arm cranking and gripping. An example of a product
that uses arm cranking is the BayGen radio or the Freeplay Self-Powered


An example of a product that uses gripping is the Forever Flashlight:


My questions to you are:

Has anyone ever researched the possible power output using arm cranking
or gripping? If so, what kind of research instrument did they use and
what where the results? What is the most comfortable crank arm length
and crank handle for repetitive arm cranking? What is the most
comfortable grip span and grip shape for repetitive gripping?

I will put the results on the web.

Thank you for your time and consideration. Sincerely,

Peter Slob

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