Of course, this only applies in North America and other 60Hz areas. You
Europeans, Asians, etc., are a bit slower at 50Hz; 1,500rpm for 2 and
1,000/2,000 for 3 (non geared) blades. Right???

"Doug" wrote in message
om...
It is 1800 for a 2 blade prop, and 1200 and 2400 for a 3 blade prop,
if my memory serves me.
I worked the math once. Light goes off 60 times per second, which is
3600 times a minute. And you have to account for the number of blades.
Just pull up with a street light to your back and try it. The prop
will stop. Should be at one of the numbers above.

It is not every multiple of 60.