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## WHICH WINDMILL BLADES ANGLE IS MOST EFFICIENT

 Researched by Michael E.  1998-99

PURPOSE

The purpose of this experiment was to find out which blade size and angle is most efficient.

I became interested in the idea when I learned that windmills are non-pollutant to the environment.

The information gained from this experiment will benefit society by knowing which blade size and angle will generate the most electricity.

HYPOTHESIS

My first hypothesis is that the closer the blade is to 45 degrees the more electricity the windmill will produce.

I base my hypothesis from information gained while reading literature on windmills.

My second hypothesis is the bigger the blade, the more electricity the windmill will produce.

EXPERIMENT DESIGN

The constants in this study were:

• Same windmill
• Same fan (wind generator)
• Same DC ampmeter
• Same electricity generator
• Same wind speed
• Same fan distance (1 meter) from the blades

The manipulated variables were the angle and the length (blade area) of the blade.

The responding variable was the electrical output of generator attached to the windmill.

To measure the responding variable, I am going to hook a ampmeter to the motor and record the electrical current output.

MATERIALS

 QUANTITY ITEM DESCRIPTION 2 Electrical wires 1 Rubber band (pulley) 1 Fan (wind source) 1 Tape measure 1 Windmill (Homemade from Tinker-Toys and Erector Set) 1 Ampmeter (Measured current output) 1 Protractor (Measuring blade angle) 1 Electrical generator 8 5cm x 1cm blades 8 10cm x 1cm blades 8 15cm x 1cm blades 8 20cm x 1cm blades

PROCEDURES

1. Build the windmill out of Tinker-Toys and Erector Set.
2. Cut out four of each of these; 1 inch, 2 inch, 3 inch, 4 inch, and 5 inch. long  blades out of vaneshen blind blades.
3. Place fan approximately 1 meter away from windmill.
4. Attach all of one size to the propeller holder.
5. Measure the degree of the blade with a protractor.
6. Make sure the blades are at 0 degrees (parallel with other blades).
7. Attach ampmeter wires to the motor.
8. Turn the fan on and take notes on DC current.
9. Read the voltmeter to tell how much electricity has been produced.
10. Repeat the above but change the angle of the blade to 15, 30, 45, 60, 75, and 90 degrees.
11. Repeat the above with the 5 inch long blades set at 0 degrees.
12. Repeat the above with the 10 inch long blade set at 0 degrees.
13. Repeat the above with the 15 inch long blade set at 0 degrees.
14. Repeat the above with the 5 inch long blade set at 0 degrees.
15. Collect the data and make graphs of current output vs. blade area and angle.

RESULTS

The original purpose of this experiment was to find out which blade size and angle is most efficient.

This experiment showed me that a windmill must have the optimum angle and blade surface area to generate electricity.

CONCLUSION

My first hypothesis is that the closer the blade was to 45 degrees; the more electricity the generator will produce.  The greatest amount of electricity was produced at the 75 degree blade angle for all four blade areas. The results indicate that my first hypothesis should be rejected because at 45 degree blade angle; the amount of electricity generated was less than at 75 degree blade angle.

I wonder if blades wider than 1cm would increase the electrical current output of the generator.  Also if I were to conduct this project again, I would use a bigger wind source (fan) so that I could get the windmill or windmills to create more electricity.

BIBLIOGRAPHY

ìBernoulliís Law.î Grolier Interactive Encyclopedia, CD, 1998

Danish Wind turbine Manufacturing Associate. ìOffshore Foundations: Mono Pileî [Online] Availablehttp://www.windpower.dk/tour/rd/monopile.htm

Julian, John. ìProject.î[Online] JSki184@aol.com from johnj@nts-online.net, January 6,1999

ìPower.î Grolier Interactive Encyclopedia, CD. 1998

ìProduct Description.î http://www.windmillpower.com/product-info.html. January 12, 1999

ìPropeller.î Grolier Interactive Encyclopedia, CD.1998

Settles, Gary S. ìPropellerî, Grolier Interactive Encyclopedia. 1998, CD

ìWindmill.î The World Book Encyclopedia. 1994. Vol. 21. pg. 335

ìWindmills and Windpower.î Grolier Interactive Encyclopedia, CD. 1998

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