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  1. S

    Small wind turbine

    Kidwind uses 6:1 gearbox. Look at some of the Construction Instruction pdf's for ideas: http://www.kidwind.org/PDFs.html [Broken]
  2. S

    Small wind turbine

    The power in the wind itself can be estimated. Here is a link with some formulas: http://www.windstuffnow.com/main/wind.htm If you put a big prop on the little generator it has large moment of inertia, taking more time to spin up to speed. It might be better to funnel the air into a...
  3. S

    Small wind turbine

    Yes, this would help. You want to understand how the DC machine operates as a power transformer. This will help answer your transformer question above while giving more insight into the system at the same time. The DC machine has two air gap equations which are best written in standard SI...
  4. S

    Small wind turbine

    Get hold of a 100 ohm resistor and measure its actual value. It will be within a few percent error of the resistor they use for the competition. Then hook up the generator leads to the load resistor and spin the generator with a variable speed drill. Measure the voltage across the resistor...
  5. S

    Small wind turbine

    The load is fixed at 100 ohms. Put 1 volt DC across it and compute the amps I = V/R. Put 0.5 volt DC across it and the amps go down (not up). You can't get more power out of a transformer than you put into it. Do you have the DC generator in hand? A volt and amp meter? What about a way to...
  6. S

    Small wind turbine

    These are good questions. But what happens is that the components you insert in the system generate some heat internally, the temperature rises, and this is a loss of power. The load resistor itself will be dissipating all the input power as heat. It will get warm. The heat flows to the...
  7. S

    Small wind turbine

    There are two problems with using an electrical transformer between the DC generator and 100 ohm load resistor. A transformer needs an AC signal to operate propertly. Also it cannot magically make more power as you properly question. Apply Ohm's Law to the Load Resistor: V = IR, but V is...
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