Method for determining the horizontal airspeed of helicopters in

Details Method for determining the horizontal airspeed of helicopters in Method for determining the horizontal airspeed of helicopters in

1987-06-02

1988-08-30

Woodiel, Donald O.

Measuring and testing

Navigation

Ship's log

73178H, 364443, G01C 2110

Patent

active

047667672

ABSTRACT:
A method for determining the horizontal airspeed of a helicopter in the high speed (v.sub.e >20 m/s) range. Pitch angle and the longitudinal control signals are recorded by sensors such as an inertial navigation system and a potentiometer connected to the pilot's control lever. Equivalent speed signals are calculated from the measured pitch angle and longitudinal control signals by means of calibration equations. These signals are then filtered and weighted. The horizontal airspeed is then derived from the sum of the weighted signals divided by the sum of weighting factors k.sub..theta. and k.sub..delta.x determined in accordance with the sensed pitch angle and longitudinal control signals. The horizontal velocity signal may be filtered, if necessary.

REFERENCES:
patent: 4023409 (1977-05-01), Durand
patent: 4648269 (1987-03-01), Durand
patent: 4702106 (1987-10-01), Hassenpflug et al.

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