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Cranking and gripping

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  • Cranking and gripping

    Dear BIOMCH-L readers:

    Iím a student at the Delft University of Technology, at the moment Iím
    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). Iím 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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