>>>>> "DANMAS" == DANMAS <DANMAS@aol.com> writes:
DANMAS> In a message dated 97-08-11 03:37:14 EDT, Jim
DANMAS> Davis wrote:
DANMAS> Whatever horse power is required to drive the fan
DANMAS> from the engine, it will take anywhere from 1.2 to
DANMAS> 2 times that horse power to drive the alternator
DANMAS> to power it from an electric motor. [...]
DANMAS> Now, put that same fan on an electric motor, and
DANMAS> what happens? To move the same amount of air, the
DANMAS> fan will require the same horsepower to spin as it
DANMAS> did before.
Here's your fallacy. The fan you were using before (on the
engine) is neither an efficient design (at least on my TR-4)
nor is is shrouded, so the air it moves doesn't all
necessarily go where you'd like it to for optimum cooling.
You can, in fact, break even or a little better by using a
well designed lightweight electric fan (the old one is
_heavy_ too) in a good shroud. The real win is that at idle,
you can move enough air to keep that big lump of iron cool
even in stop-and-go in New Orleans in summer...
-MM
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