On Apr 24, 5:00*pm, George wrote:
On 4/24/2011 11:38 AM, wrote:





On Sat, 23 Apr 2011 23:55:25 -0700 (PDT),
wrote:

Also picked up this big IBM dc motor at a hamfest. Going to try making
a windmill of some sort.

Greg- Hide quoted text -

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You would be best to use automobile technolgy. Most of the the
problems are solved if you do.

The unsolved problem with automotive alternators is a horrible
efficiency ratio. With a petrol engine providing massive amounts of
power for a relatively small alternator draw, they do not care much
about how efficient it is. The automotive A/C units have the same
issue.

What is a typical automotive alternator? 80 Amps. Getting *960 watts
from a rotating device the size of a small grapefruit is pretty efficient..- Hide quoted text -

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That is nothing to do with efficiency.