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What does the abbreviation 'R' stand for?
  • A
    Rotor disc area.
  • B
    Rotor diameter.
  • C
    Rotor speed.
  • D
    Rotor radius.

The abbreviation "R" stands for "Rotor Radius".

Rotor radius is usually measured either in feet or metres.

  • The largest dimension of the helicopter when the rotors are turning is abbreviated as "D".
  • Rotor disc area is abbreviated as "S".
  • Rotor speed is abbreviated as "RRPM" or "NR".

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