Method and apparatus for determining the airspeed of rotary wing

Details Method and apparatus for determining the airspeed of rotary wing Method and apparatus for determining the airspeed of rotary wing

1996-09-11

1998-05-12

Oen, William L.

Measuring and testing

Navigation

Take-off and landing monitors

G01C 2100

Patent

active

057508917

ABSTRACT:
A method and apparatus for determining the airspeed of a rotary wing aircraft having a sustaining rotor with a plurality of radially extending rotor blades for rotation about a substantially vertical axis comprises the steps of measuring an airflow sideslip angle established during rotation of each rotor blade by the vector of a radial flow component due to the relative wind vector and the rotational velocity perpendicular to a blade feathering axis, producing a signal representative of the sideslip angle, comparing the signal in a processor containing information on a known relationship between the sideslip angle and airspeed, providing an output signal representative of the airspeed and wind direction to a display which may display both the airspeed and wind direction.

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patent: 4648271 (1987-03-01), Woolf
patent: 4747305 (1988-05-01), Evans et al.
patent: 4856329 (1989-08-01), Buck et al.
patent: 5050086 (1991-09-01), Lambregts
patent: 5063777 (1991-11-01), Arethens et al.
Patent Abstracts of Japan, JP4218778, Oct. 8, 1992, vol. 16, No. 568.

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