Matches 101 - 150 out of 302 < 1 2 3 4 5 6 7 >
Match Document Document Title
5222691 Automatic turn coordination trim control for rotary wing aircraft  
A helicopter flight control system includes an automatic turn coordination system which provides a coordinating yaw command signal to the tail rotor of the helicopter. The system stores on command...
5213283 Low speed turn coordination for rotary wing aircraft  
A helicopter flight control system (21) includes a model following control system architecture which automatically provides a coordinating yaw command signal to the helicopter tail rotor to...
5214596 System for determining the airspeed of helicopters  
System for determining the airspeed of helicopters, having a coupled measuring device to which is supplied by the cyclic and collective control signals, the attitude angles and the rotational...
5213282 Maneuver feel system for a rotary wing aircraft  
A helicopter fly-by-wire flight control system (21) includes a model following control system architecture which provides the pilot with maneuvering feel. Maneuvering feel is generated by varying...
5195700 Low speed model following velocity command system for rotary wing aircraft  
A helicopter flight control system (21) includes a model following control system architecture which operates in a velocity command mode at low ground speeds. The control system processes...
5195039 Hover position hold system for rotary winged aircraft  
A ground-plane-referenced, acceleration signal 2 and Doppler velocity signal 56 are utilized by a complementary filter 6 to provide a complementary velocity signal 8 which is transformed 60 to an...
5178307 High speed yaw control system for rotary wing aircraft  
A helicopter flight control system includes a model following control system architecture to control helicopter response about the yaw axis. The control system processes information from a variety...
5169090 Attitude synchronization for model following control systems  
A helicopter flight control system includes a model following control system architecture having provisions to compensate for Euler singularities which occur when the pitch attitude of the...
5141177 Model following control system  
An aircraft flight control system including model following control laws includes improved logic and algorithms to limit the error between a desired parameter value from the output of a model and...
5058824 Servo control system for a co-axial rotary winged aircraft  
A servo control system for a radio controlled co-axial rotor helicopter includes a receiver 4 to provide signals indicative of operator desired pitch, yaw, roll, and collective commands to an...
5045649 Self-adjusting slide assembly for weight on gear switch  
A self-adjusting slide assembly is provided for mounting a weight on gear switch to an aircraft. The slide assembly is particularly adapted for mounting on a skid equipped helicopter for responding...
5015187 Helicopter remote control system  
A remote controlled helicoper having a video radio frequency link to a fixed control location has a video camera with a field of view including the terrain forward of the helicopter, an airspeed...
5012423 Back-up fly by wire control system  
A device and method of back-up fly by wire control, especially useful in fly by wire systems when a failure mode is encountered. The problem of back-up system controllability with the type of...
4992713 Aircraft autopilot with yaw control by rudder force  
An autopilot with long term yaw coordination capabilities which utilizes lateral acceleration to generate a rudder force command which is combined with the sensed rudder force to create an error...
4981456 Remote controlled helicopter  
Several embodiments of remote controlled helicopters wherein the longitudinal position of the helicopter is controlled by means of a tether wire affixed to the rear of the helicopter. In some...
4980684 Warning system for tactical rotary wing aircraft  
A warning system for rotary wing aircraft that monitors the altitude above ground of the aircraft and issues a warning when there is insufficient terrain clearance. The warning criteria are...
4980835 Control law system for X-Wing aircraft  
Control law system for the collective axis, as well as pitch and roll axes, of an X-Wing aircraft and for the pneumatic valving controlling circulation control blowing for the rotor. As to the...
4979698 Rotor system for winged aircraft  
A rotor system for a rotor convertible fixed winged aircraft comprising a rotatable rotor shaft mounted on one of the wings of the aircraft, the shaft tiltable between a substantially vertical...
4970651 Autonomous kinematic measurement system for helicopters  
An autonomous kinematic measurement system for helicopters is disclosed. A helicopter comprises a lifting rotor, an anti-torque rotor, first means to control the cyclical pitch and the collective...
4965879 X-wing fly-by-wire vehicle management system  
A complete, computer based, vehicle management system (VMS) for X-Wing aircraft using digital "fly-by-wire" technology controlling many subsystems and providing functions beyond the classical...
4958786 Active control mechanism for a helicopter  
The rotor damping and control power value can be made arbitrary by controlling a cyclic pitch control mechanism with a signal proportional to the angular acceleration of the attitude angle θ, a...
4953098 Higher harmonic control system for X-Wing aircraft  
In an X-Wing aircraft a dynamic higher harmonic control (HHC) system addresses the vibration which typifies a very rigid rotor and is implemented in two ways--a scheduled HHC and an active HHC. A...
4947334 Helicopter control systems  
A helicopter control system comprises a flight control computer, an engine control computer and an integrated flight and engine control computer, the latter generating output signals operative both...
4924400 Arrangement for controlling the performance of bob-up/bob-down maneuvers by a helicopter  
A control arrangement for use in conjunction with a flight control computer operating in response to various input signals including those received from a collective stick to control the flight...
4893261 Apparatus and method for determining airspeed and direction  
Aircraft speed and direction are determined by sampling the sinusoid-like pressure variations at the end of a rotor and performing a Fourier analysis on the pressure samples. Fourier quadrature...
4870412 Warning device on an aircraft  
A measuring device (1, 12, 13, 14) is equipped with a blade angle indicator (1) indicating the blade angle adjustment of the rotor blades of a helicopter, a pressure altimeter (13) and an outside...
4869106 Governor checkout apparatus and method  
An overspeed governor for adjusting the blade pitch of a propulsor in an unducted fan aircraft engine to prevent propulsor overspeed comprises a flyweight governor which is rotated in response to...
4834318 Helicopter flight control systems  
In a helicopter, signals representative of the rotor disc attitude of a main sustaining rotor (11) are fed into a flight control system (24) to modify an actuator demand signal (31) controlling a...
4831567 Method and apparatus for pilot training  
A method and system for providing training mode operation of a multiple engine aircraft simulates the failure of one engine and the simultaneous operation of at least one other engine in an...
4829441 Method for determining the air speed of a helicopter, system for carrying on this method and method for calibrating such air speed determining method and system  
The air speed is determined by solving the equation ##EQU1## in which P z is the pitch of the antitorque device, γ z , the vertical acceleration of the helicopter, k 1 -k 10 , parameters...
4807129 Helicopter rotor and engine control  
A Helicopter rotor and engine control apparatus in which the computers used to control the engines and the rotors are linked to exchange performance data and act together to improve the aircraft...
4801110 Approach to hover control system for helicopters  
An improved apparatus for automatic deceleration of a helicopter to substantially zero air speed from a glide slope descent. Parameters available in a typical helicopter automatic flight control...
4758958 Method and apparatus for trimming and stabilizing an aircraft  
An aircraft, such as a helicopter, is trimmed into a desired position by ducing a trimming control signal during the maneuver for the desired positive and adjusting control forces in response to...
4748569 Helicopter navigation and location system  
The disclosure relates to a helicopter (5) having a flight path computer to provide signals for pilot or automatic flying in accordance with a predetermined flight path, a forward looking infra-red...
4741501 Preventing augmenting vertical load induced oscillations in a helicopter  
Collective stick inputs are provided (18) to a high pass filter (24) when collective stick reversals in excess of a threshold collective authority rate (15%/sec) and in excess of a threshold...
4740899 Use of headwind and airspeed to achieve a transition to a hover in a helicopter or vtol aircraft  
An improved system and technique is disclosed which enables an aircraft control system to bring an aircraft to hover with no direct measurement of ground speed. The system includes a device for...
4695013 Landing aid  
A warning device, for a helicopter with a tail rotor and a mechanical protection device therefor, for giving during emergency power-loss landings a flare signal to the pilot to initiate flare...
4664340 Vehicles  
A stabilization system for hover vehicles, for example free-flying or cable-controlled helicopters or ducted fan vehicles. The system includes at least one downwardly directed sensor which...
4664346 Method and apparatus for stabilizing the steering force in an aircraft, especially a helicopter  
The steering or control force for operating a steering column in an aircraft, especially in a rotary wing aircraft, is stabilized. The steering column influences through an articulated steering or...
4648269 Speed measuring device for a helicopter  
The invention relates to the technical field of pilotage aids for helicopters. In a speed measuring device having two measuring devices for longitudinal speed and lateral speed of the helicopter,...
4648568 Emergency anti-torque control system and method for helicopters  
A drogue chute is deployed to the rear of a helicopter in the event of tail rotor malfunction. Deployment may be initiated automatically with the use of a microprocessor upon an abnormal level of...
4645141 Automatic flight control system  
There is disclosed a system and technique which enables an aircraft (helicopter or VTOL) to be more easily controlled for maintaining precise position or velocity in a hover condition. The system...
4628455 Cross axis torque limiter for helicopter autopilot  
A helicopter flight control system employs coupled torque limiters in the rotor cyclic pitch axis and collective pitch axis for airspeed and vertical path control, respectively. When the collective...
4603388 VTOL altitude hold system with automatic ground effect compensation  
During a transition of a VTOL aircraft such as a helicopter, from one altitude held without its ground effect zone to another to be held within its ground effect zone, or vice versa, a collective...
4603389 Three cue flight director system for helicopters  
A full time three-cue (roll control, pitch control and collective control) for helicopters flight director and/or autopilot wherein the collective control cue is automatically activated when...
4591112 Vectored thrust airship  
An airship with provisions for vectored thrust provided by a plurality of controllable pitch rotor thrust producing units attached to the elongated aerostat hull spaced from and on opposite sides...
4580210 Control system having variably biased manipulatable unit  
In a control system having a manipulatable unit, such as an aircraft stick, which is biased toward a neutral position to provide control "feel", an input which at each instant signifies the...
4580223 Incorporation of pitch bias actuator function into an existing AFCS  
An aircraft automatic flight control system (AFCS) includes a pair of fast, limited authority inner loop actuators responsive to signals indicative of aircraft attitude or other flight parameters...
4577275 Flight director go-around mode  
An improved flight director go-around mode adjusts the collective stick position in a closed loop to increase lift to a desired value. If the engagement airspeed is below the maximum rate of climb...
4573871 X-Wing aircraft circulation control  
X-wing aircraft employ a rigid rotor-wing utilizing symmetrical circulation irfoils. The rotor is driven mechanically, and lift is achieved by modulation of air circulation about the base airfoils....
Matches 101 - 150 out of 302 < 1 2 3 4 5 6 7 >