According to the Bernoulli equation along with other
basic torque and angular velocity calculations, the maximum angular velocity of
the propeller (ωmax) is directly proportional to the number of
blades (n), the pitch angle (θ), and the linear velocity of the water, which in
this case would be the velocity of the boat (Vboat), and inversely
proportional to the diameter of the propeller (d).
Omega max=0.395*V boat
Once the generator was fully assembled it was taken to
the largest body of water available which was a bathtub and then kiddie pool. The generator was
hooked up to a voltmeter and was pushed and pulled through the short distance
in the water. While doing this, the generator was barely able to produce 2
volts since there wasn’t enough room to move the generator fast enough and get
it to produce an adequate amount of power consistently.
From minor testing of the motor, we determined an
equation of best fit for the voltage output as a function of how fast the drive
shaft will be spinning.
OUR FINAL DESIGN!!!
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| Our Frist, broken, propeller |
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