10 amps at 12 volts (which is a 'typical' figure I just made up), is
only 120 watts, which is only about 1/6 horsepower. Even if your
alternator is only 50% efficient, it still draws only 1/3 horsepower to
turn the fan, when it is running.
It would be nice to know at what rpm (and under what conditions) JK
Jackson's oft-quoted figure was taken at. But, even if the mechanical
fan only draws half that much, that's still 3.7 'free' horsepower.
Randall
59 TR3A daily driver - electric fan and loving it
"Biedermann, Frank (SSABSA)" wrote:
>
> but have you considered the extra power required by the alternator to
> generate
> the electricity to power the electric fan? And that conversion from
> mechanical
> to electrical energy and then back again isn't exactly lossless either...
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