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Total Rotor Thrust is defined as...

  • A

    An aerodynamic force equal and opposite to the weight.

  • B

    An aerodynamic force acting perpendicular to the relative airflow.

  • C

    An aerodynamic force acting parallel to the tip path plane.

  • D

    An aerodynamic force acting perpendicular to the tip path plane.

Refer to figure.
The aerodynamic force of thrust or lift from each blade acts at 90º to the blade axis. When each blade’s thrust is resolved into vertical and horizontal components, the sum of the vertical components acting at 90º to the plane of rotation (or tip path plane), is called “Total Rotor Thrust (TRT)”.

The TRT acts along the axis of rotation through the centre of the hub and perpendicular to the tip path plane. This means that wherever the disc is pointing, so too is the direction of the TRT vector.

The factors affecting the TRT are:

  1. Rotor RPM (NR)
  2. Pitch angle
  3. Coning angle
  4. Disc area
  5. Blade mass
  6. Air density

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