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Unread 09-03-2007, 22:11
brennerator brennerator is offline
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Join Date: Jan 2005
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Re: Mechanical Question about project Urgent!

I was able to use my fan as a generator.

I used a 1 k-ohm resistor and read the voltage across the two leads.

My data as follows:

15 mph = 1.20 V
20 mph = 2.06 V
25 mph = 2.68 V
30 mph = 2.83 V
35 mph = 2.77 V
40 mph = 2.82 V
45 mph = 2.70 V
50 mph = 2.52 V
55 mph = 2.26 V
65 mph = 2.21 V

The fan probably was not designed to handle such high rpm's past 40 mph.

Can I make any conclusions from this data taht will allow me to test the efficacy of using fans. Please note that I was not able to calculate how much the overall drag coefficient increased on my car.

Thanks so much for all your help.