[Christ]

I'll add to that, as well. A prop driven alternator can't be more than about 24% efficient from wind to battery... It would take a prop the size of the frontal area if the engine block, or a very high wind speed to make any useful power.

There is also not alot of need for an alt on cup cars... Not alot of lights and stereo/climate control, ya know? That being the case, it might have produced enough power to keep the battery charged and keep the ignition system operating, but likely not much else.

Use search function "squirrel cage alternator". I did some math in that thread to explain exactly this.