I don't know the speeds for sure, I can only approximate, the 6100 and 6200 should be doing between 3000-5400rpm and the 6000 is about 1800-3000rpm. I can only approximate that, I don't know all these details they would have to put a tag in my brain if I knew too much. The 6100 and 6200 differ only by prop size and the motor coil and electronics of coarse are beefed up to handle the increased load. The 6000 and 6100 differ in voltage.