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windmill - pitch anlge

Discussion in 'Home Power and Microgeneration' started by developer, Dec 26, 2004.

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  1. developer

    developer Guest

  2. m II

    m II Guest


    What are the symptoms? If the blades aim into the wind straight on, it
    won't turn. If the blades are flat to the wind they won't turn. In
    between those two extremes, as you turn from the 'straight in'
    direction towards the flat, RPM picks up, but torque decreases, making
    starting harder.

    Think of a sailboat gaining speed by 'tacking'. The apparent wind
    speed increases.

    The biggest problem I can see here is that your car alternator is
    designed to rev at around 15 or 16 (or higher) thousand rpm. You won't
    get those revs with that blade design unless you use gearing of some
    sort. That complicates things and increases maintenance.

    This one way to do it. No chains, no belts..Note the ratio.

    http://www.survivalunlimited.com/windpower/frictionroller.htm


    The other alternative is to use only three larger blades, but the
    gearing is STILL required if you use that car alternator. .


    Do a search for ' volvo brake alternator wind magnet '


    That will get you some homebuilt permanent magnet alternators that
    work at lower rpm.






    mike
     
  3. Guest

    Nope, not tacking. Falling off, ie bearing away from the wind will
    increase your speed, and the apparent wind will remain close to the
    boat's centerline.

    Tom
    55 years a sailor, sometimes competitive.
    Now smack in the middle of some of the best sailing breezes ever,
    and hundreds of miles from any decent water. Land yachts anyone?
    Capsize and get gravel rash...


    Tom Willmon
    near Mountainair, (mid) New Mexico, USA

    Where does it go? It doesn't matter. Flush it.

    Net-Tamer V 1.12.0 - Registered
     
  4. m II

    m II Guest

    These fine people misled me?

    http://www.sor.princeton.edu/~rvdb/sail/sail.html


    It seems to me that the more you approach ninety degrees away from the
    wind, the more your speed would pick up. The boat may not be going
    where you want to go, but you'd not get there quicker..




    mike
     
  5. Gymy Bob

    Gymy Bob Guest

    The wind puts great longitudinal pressure on that end bearing. I am not sure
    a car alternator even has an end bearing. What would it need it for? There
    is no end pressure in a car application. Your friction is probably jamming
    the works.
     
  6. oh thats me

    oh thats me Guest

    get an old 10 speed push bike or one with a few more gears and try that
    change gears to change your alternator speed you can use the wheel rim
    also as a belt drive
     
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