True, but a modern alternator will produce power at lower
rpm which means less drag. Also it should have lower frontal
area and internal cooling drag. Alternators don't need
heavy cast iron housings and w/o a commutator, should be
electrically quieter.

Ag planes often use a wind driven pump, so getting a proper
prop isn't difficult, just tell the prop shop how many watts
and what a/s, etc.


--
James H. Macklin
ATP,CFI,A&P

--
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"Morgans" wrote in message
...
|
| "Jim Macklin" wrote
|
| You can drive the alternator with a propeller just like
the
| old generator, it just makes power with less drag.
|
| You do need to use a special propeller, that is designed
for converting
| thrust into power, instead of power into thrust. The more
curved surface
| needs to be on the backside of the airstream, unlike a
regular prop.
|
| For a generator, you can use a 12 volt motor with magnets
in it, and a
| voltage regulator added to it.
| --
| Jim in NC
|
|