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Automatic turn coordination trim control for rotary wing aircraft

  • US 5,222,691 A
  • Filed: 08/28/1991
  • Issued: 06/29/1993
  • Est. Priority Date: 08/28/1991
  • Status: Expired due to Term
First Claim
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1. An automatic turn coordination trim control system for a helicopter of the type which receives from a plurality of sensors, signals indicative of:

  • bank angle, lateral acceleration, and lateral ground speed, and outputs a coordinating yaw command signal to the tail rotor of the helicopter to automatically place the helicopter into a coordinated turn about a variable pilot selectable attitude, the automatic turn coordination system comprising;

    means for supplying a first signal and a second signal both having an active and inactive state, where the active states are mutually exclusive;

    first synchronizing means responsive to said first and second signals, for storing a bank angle datum value which is equal to the present value of the bank angle signal upon a transition of said first signal to its inactive state, and while said first signal is inactive for providing a normalized banked angle signal which in indicative of the difference between the present value of the bank angle signal and said bank angle datum value, and for resetting said bank angle datum value to a predetermined datum when said second signal is active such that the aircraft is automatically brought back to a predetermined bank angle;

    turn coordination means responsive to said normalized bank angle signal value, for computing the coordinating yaw command signal value indicative of the yaw required for the aircraft to fly a coordinated turn about the variable pilot selectable attitude; and

    means for outputting said coordinating yaw command signal to the helicopter tail rotor.

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