Boots – shoes – and leggings
Patent
1987-06-18
1989-05-09
Lall, Parshotam S.
Boots, shoes, and leggings
364565, 36457102, 244 1713, B64C 1134, G06F 15329
Patent
active
048294411
ABSTRACT:
The air speed is determined by solving the equation ##EQU1## in which P.sub.z is the pitch of the antitorque device, .gamma..sub.z, the vertical acceleration of the helicopter, k.sub.1 -k.sub.10, parameters depending on the type of helicopter, p.sub.x,y, the longitudinal or transverse cyclic pitch, p.sub.o the collective pitch of the main rotor, .theta..sub.x,y the angle of bank of the helicopter about the transverse or longitudinal axis of the helicopter. The system for determining the air speed may also include a conventional anemometer for hybridization with the computed speed. The parameters k.sub.1 -k.sub.10 are determined by self-calibration and by assuring that the variations of the ground speed and of the air speed are the same from one flight configuration to another one of a pair of flight configurations, among a series of pairs, for which the sensiting parameters of the helicopter are measured in the earth's reference by means of an airborne ground speed reference.
REFERENCES:
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patent: 4603389 (1986-07-01), Griffith et al.
patent: 4628455 (1986-12-01), Skutecki
Bramwell et al, "Helicopter Dynamics," 1976, Edward Arnold (Publishers) Ltd.
Faulkner, "Flight Investigations of a Helicopter Low Air Speed Estimation System Based on Measurement of Control Parameters", 9/16/80, 6th European Rotorcraft & Powered Lift Aircraft Forum, paper 41.
Mandle, "A New Internal Low Airspeed System for Helicopters," Aerospace Division Crouzet, no date available.
Faulkner, "A Method of Helicopter Low Airspeed Estimation Based on Measurement of Control Parameters," 5th European Rotorcraft & Powered Lift Aircraft Forum.
Goudon Jean-Claude
Mandle Jacques
Black Thomas G.
Crouzet - A French "Societe Anonyme"
Lall Parshotam S.
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