초록 ▼

A cyclic stick system for a helicopter or other aircraft includes memories for holding minimum and maximum speed values, a comparator for comparing an air speed V1 with the minimum and maximum speed values, a router for selecting either the air speed V1 or a quiescent speed, a subtracter for obtaini

A cyclic stick system for a helicopter or other aircraft includes memories for holding minimum and maximum speed values, a comparator for comparing an air speed V1 with the minimum and maximum speed values, a router for selecting either the air speed V1 or a quiescent speed, a subtracter for obtaining a difference between the output of the router and a reference speed, another router for selecting between the difference and a signal representing an orientation of the stick, and a switch for selecting times when the air speed V1 is to be stored as the reference speed. On the basis of the air speed V1 and under the control of the device for retrimming said cyclic stick, the system acts on the motorization of stick in order to confer on the helicopter apparent longitudinal static stability in terms of forces on the cyclic stick so that to accelerate (or decelerate) and maintain a new higher (or lower) speed. The force applied to the cyclic stick is always in the direction of pushing (or of pulling) outside of any deliberate retrimming action.

대표청구항 ▼

[ We claim:] [1.] A cyclic stick system for an aircraft, the aircraft comprising means for continuously delivering parameters which are representative of a current flight status of said aircraft, at least one of said parameters being representative of an air speed V1 of said aircraft with respect to

[ We claim:] [1.] A cyclic stick system for an aircraft, the aircraft comprising means for continuously delivering parameters which are representative of a current flight status of said aircraft, at least one of said parameters being representative of an air speed V1 of said aircraft with respect to air, said system comprising:a cyclic stick for being shifted by a pilot in at least a direction corresponding to pitch-attitude control of said aircraft;elastic means for returning said cyclic stick by exerting an action which opposes an action exerted by said pilot on said cyclic stick in said direction for said pitch-attitude control;a moving member to which the elastic means is attached at an attachment point;motor means for shifting the moving member;trim-release means for being actuated by the pilot to cause the action exerted on said cyclic stick by said elastic means to be canceled out;first memory means for recording a value Vref of said parameter V1 representative of said air speed at moments when said pilot actuates said trim-release means; andfirst routing means, controlled by said trim-release means, for sending to said motor means:(i) a control command which is representative of positions of said cyclic stick for pitch-attitude control at the moments when said pilot actuates said trim-release means; or alternatively(ii) outside of the moments when the pilot actuates said trim-release means, either(a) a nil control command, when a current value of said parameter V1 representative of the air speed is below or equal to a minimum value Vmin above which said aircraft has unsatisfactory static longitudinal stability; or(b) a control command which is a function of a difference between said current value of said parameter V1 representative of the air speed and said recorded value Vref, when the current value of said parameter V1 representative of the air speed is above said minimum value Vmin.