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Refer to figure.
If the helicopter has a True Airspeed (TAS) of 35 knots (kt), what is its Rate of Descent (RoD) during autorotation?

  • A

    1535 ft/min

  • B

    780 ft/min

  • C

    1720 ft/min

  • D

    1630 ft/min

Refer to figure.
With this figure the rate of descent in m/s for each TAS in kt can be determined during autorotation with a specific rotor RPM of 471:

  • Enter from the bottom with 35 kt TAS.
  • Move vertically up until crossing the curve and continue horizontally to the left to read the rate of descent 7.8 m/s.
  • 1 minute equals to 60 seconds and 1 metre equals to 3.28 feet.
  • Convert 7.8 m/s into ft/min multiplying by the factor (3.28 x 60) 196.8: 7.8 m/s x 196.8 = 1535 ft/min.

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