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Discussion in 'Electronic Design' started by [email protected], Nov 10, 2008.

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  1. Guest

    hi friends i'm trying to build a mini windmill for a science project
    at my high school can some one help me on the construction & the
    working of the windmill ..
  2. James Arthur

    James Arthur Guest

    Lots of projects, theory, and examples here:

    James Arthur
  3. mpm

    mpm Guest

    Looks like you've received some good links and suggestions.
    I'll email you a really cool photo of a friend of mine atop a
    commerical wind generator.
    Quite impressive as to scale.

  4. Rich Grise

    Rich Grise Guest

    Why haven't you asked your teacher or your fellow students?

    Or studied your textbook?

    Or tried the other side of google?

    Heck, I could do it for you, if you pay me what you're paying the
    school that's not teaching you anything.

    Good Luck!
  5. Charles

    Charles Guest

    That's hardly basic math.
  6. K Ludger

    K Ludger Guest

    What year are you in at school? This will help people here to give you
    suggestions, the help for a junior school project will be a lot different to
    a senior school project.
  7. K Ludger

    K Ludger Guest

    Sorry - missed the "high school"

    What about visting an automotive dismantler and seeing if you can convice
    the owner to donate an old thermatic fan to your project.It's wont be super
    efficient but it will likely be a good start for a school project. Think
    about how you would mount it so it follows the wind direction and how you
    might get the electricity down from the motor (now a generator) without the
    wires twisting up as the head part rotates. I'm not sure if the motors are
    all suitable. Try shorting the leads together, if it gets harder to spin
    (you are short circuiting the "generator" output) then its probably
  8. Charles

    Charles Guest

    It is done all of the time, over and over, and occasionally leads to
    innovation. Edison understood little and invented a lot.

    Engineers tend to have constipated minds.
  9. Charles

    Charles Guest

    I used to teach engineers and now I taunt them.
  10. MooseFET

    MooseFET Guest

    A quick description of how to do the math:

    Assume that the wind means that all the air is moving at the same

    Work out how much air goes through the area of the windmill blades per

    Figure the mass of this air.

    E = 0.5 * M * V^2

    E : energy resulting from stopping that air
    M : mass of the hunk of air
    V : the speed of the hunk of air

    Since we are using numbers for one second energy equals power.

    This gives a very optimistic value but since the power from wind goes
    as the cube of the speed, you don't need a very good number.
  11. BobG

    BobG Guest

    Get a stepper motor out of a printer or buy one from Skycraft or
    Jameco.... they have 2 coils that spit out AC when you spin it. Run
    that to a lightbulb, or run each coil to a diode and cap to add the
    outputs together to get juice to run a small computer, etc
  12. He preaches Warmingism.

  13. mpm

    mpm Guest

    A good friend of mine graduated with an MSEE and is simply terrified
    to replace a wall outlet.
    I thought has going to pass out when I decided to troubleshoot his
    swimming pool light with the power on!

    He too took the software-engineer route.
    I guess like everything else, if you don't use it often enough, you
    lose a certain competency and comfort level.

  14. Charles

    Charles Guest

    Better than abysmal.
  15. Nemo

    Nemo Guest

    hi friends i'm trying to build a mini windmill for a science project
    There are a number of ways to generate electricity with a windmill, for
    example a bicycle dynamo, or you could mount a motor on it and run it
    backwards. Can you give us some idea of what resources you have. For
    example, can you get your hands on an electric motor? If so, what kind?
    Normally you put current into a motor and it turns. But if you turn it,
    with your windmill, it generates a bit of current. This is an
    interesting example of how many physical processes can be made to go
    backwards, which is an important scientific principle. (Like you can
    make ice melt... and then re-freeze the water.)

    There are windmills where the blades turn like a classic windmill from
    Holland, and others where the blades spin horizontally. If all you are
    trying to do is demonstrate the principle, make whichever type is
    easiest. People who build windmills professionally need to worry about
    the "best" design for a given application but you are presumably just
    trying to demonstrate the principle..?

    I suspect the tricky part of the project will be getting the windmill to
    actually turn the electricity-generating thingy. You could perhaps ask
    for advice at a local model shop, if you have one.
  16. Charles

    Charles Guest

    And our survey says "Nothing much here to be learned about windmills, or
    anything else."
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