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Which of the following statements is correct regarding a turn with limited power?
  • A

    Turning reduces the total rotor thrust required and increases power available.

  • B
    With limited power an increase in bank angle decreases the power required due to the decrease in effective weight.
  • C

    With limited power turning increases the power required and may lead to loss of height.

  • D

    With limited power turning decreases the power required and may lead to loss of height.

Refer to figure.
When turning, the total rotor thrust must be increased, if a vertical component equal to weight is to be maintained keeping constant altitude. Thus, the load factor “n” (n = L/W) increases too.

The greater the angle of bank, the greater the increase required, an effect similar to that of increased weight.

To maintain height in the turn, more collective pitch (power) is required. Thus, in critical situations, such as when experiencing limited power, attention must be paid when turning, as power may be insufficient to maintain the required altitude.

Large load factors require large amounts of rotor thrust. So, one of the most significant factors limiting turn performance is the amount of power available.

As turning increases the load factor, which demands more power, in limited power conditions the subsequent loss of height may prove fatal.

Thus, with limited power, turning increases the power required and may lead to loss of height.

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