Revolutions per minute

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Revolutions per minute (usually abbreviated rpm, RPM, r/min, or r·min−1) is a unit of frequency: the number of full rotations completed in one minute around a fixed axis.

Common usage for helicopters includes:

  • MRRPM
Main rotor RPM, also called head speed.
  • TRRPM
Tail rotor RPM.
  • Engine RPM
Engine prop shaft RPM.
  • N1 RPM
Turboshaft gas generator compressor/ turbine RPM.
  • N2 RPM
Turboshaft power turbine RPM.
  • Electrical RPM
The frequency of commutation cycles of a brushless motor or ESC. A brushless motor with 6 poles (magnets) will have an electrical RPM twice that of its physical RPM.


Wikipedia logo This page uses content from Wikipedia. The original article was at Revolutions per minute. The list of authors can be seen in the page history. The text of Wikipedia is available under the GNU Free Documentation License.


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