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

1986-06-06

1987-10-27

Woodiel, Donald O.

Measuring and testing

Navigation

Ship's log

73178H, G01C 2110

Patent

active

047021063

ABSTRACT:
A method is disclosed for determining the horizontal airspeed of helicopters in low speed ranges. At least three control functions, .theta..sub.o,i (collective pitch), .theta..sub.s,i (longitudinal control) and .theta..sub.c,i (lateral control) are measured. The magnitude of the horizontal airspeed, V.sub.H,i, is determined from its known relationship to .theta..sub.o,i. This magnitude is included in non-linear calibration equations .theta..sub.s (V.sub.H, .psi.) and .theta..sub.c (V.sub.H, .psi.) and control profiles .theta..sub.s (V.sub.H,i, .psi.) and .theta..sub.c (V.sub.H,i, .psi.) are derived therefrom. The measured values .theta..sub.s,i and .theta..sub.c,i are applied to the respective control profiles and corresponding phase pairs .psi..sub.s,1, .psi..sub.s,2 and .psi..sub.c,1, and .psi..sub.c,2 located. The pairs are compared and the incident flow angle .psi..sub.i is determined as the value common to the two pairs. From this information, the components of the horizontal airspeed are found from the relationships:

REFERENCES:
patent: 4023409 (1977-05-01), Durand

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