Updated lock-positioning of foldable helicopter blades

Details Updated lock-positioning of foldable helicopter blades Updated lock-positioning of foldable helicopter blades

1980-10-10

1983-03-15

Gruber, Felix D.

Boots, shoes, and leggings

244 1713, 416143, G06F 1520, B64C 2750

Patent

active

043769799

ABSTRACT:
The foldable rotor blades (12) of a helicopter are automatically adjusted to pitch angles where they can be locked as a prerequisite to folding, by commands generated (98, 112) to cause trim actuators (39-41) to drive swash plate servos (17-19) to the correct positions, initially (98) in response to stored trim references (120) and eventually (112) in response to the difference (109) between stored swash plate servo positions (120) and current servo positions (20-22). A claimed embodiment uses values of servo positions (20-22), just before unlocking the blades upon re-spreading them, to store, in nonvolatile memory (138), deviations (131) from nominal positions stored in read only memory, and generates (159) trim references in a subsequent folding operation in response to integrated values (166) to reduce actual position errors (162) toward zero from desired positions indicated by the stored deviations (148).

REFERENCES:
patent: 3698662 (1972-10-01), Rostad
patent: 3765794 (1973-10-01), Kudasch et al.
patent: 3874817 (1975-04-01), Ferris
patent: 4252504 (1981-02-01), Covington et al.
patent: 4268222 (1981-05-01), Bernard

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