posted 15 years ago
Nice looking windmill.
Bear in mind that your "spinning slowly" right now is with no load. As soon as you add a load of any kind, it will spin much slower. Trying to turn over a pulley system and a generator even with no electrical load will slow it down considerably. When you connect some current-drawing electrical devices to it, it will slow down even more.
It's not so much RPMs that matter but Watts. 60 RPM with no load except a couple of bearings is practically no Watts at all. Pulleys can multiply your RPMs, but they will actually reduce the number of Watts available for electricity generation, due to friction.