ANSWERS: 1
  • Chain saws range from 3,000 to 7500 Rpm. Weed eaters have a RPM of the range 3,000 upto 15,000 RPM. Now I'll give you a simple formula to calulate torque when you know the RPM and the power rating of a motor. Power=2(pi)x torque x rotational speeed. pi=22/7

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