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Refer to figure or CAP758 Figure 2.27.
If the TAS during autorotation is 60 kt, the rate of descent will be (1) _____, which can also be achieved with a TAS of (2) _____.

  • A

    (1) 1770 fpm; (2) 35 kt

  • B

    (1) 1630 fpm; (2) 39 kt

  • C

    (1) 1650 fpm; (2) 37 kt

  • D

    (1) 1790 fpm; (2) 33 kt

Refer to figure.
With the figure 2.27 the rate of descent for each TAS can be determined during autorotation with a specific rotor RPM of 471.

As shown in the figure, the rate of descent if autorotating with a TAS of 60 kt is 1790 fpm, which is also achieved if autorotating with a TAS of 33 kt:

  • Enter from the bottom with 60 kt TAS.
  • Move vertically up until crossing the curve and continue horizontally to the left to read the rate of descent 1790 fpm.
  • At the point where the curve is again intersected as moving to the left, move down and read 33 kt, the speed at which the 1790 fpm can be also achieved.

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