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Magician Harry Houdini patented a "Diver's Suit" enabling the wearer to "quickly divest himself of the suit while being submerged and to safely escape and reach the surface of the water."
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| Number | Title | Issue Date |
| 4105900 | Signal selection apparatus for redundant signal sources Apparatus for signal selection and signal consolidation of the redundant sensor signals in a triply redundant control system wherein one of the redundant sensors supplies precise information and the remaining two sensors supply less precise information is... | 08/08/1978 |
| 4103848 | Variable incidence helicopter stabilator and fail safe actuator A helicopter stabilator, combining the functions of tail stabilizer and aircraft elevator, has its angle of incidence with respect to the helicopter controlled by means of a pair of reversible actuators acting in series, controlled in a closed-loop fashio... | 08/01/1978 |
| 4095763 | Fail safe augmentation system A fail safe aircraft control system wherein duplicate control loops are employed to produce identical control signals for the system actuator. Output signals from the two loops are compared to detect when the outputs differ by a preset limit as an indicat... | 06/20/1978 |
| 4094481 | Fail passive dual servo with continuous motor speed and acceleration and monitoring The servomotor outputs of two substantially identical servo channels, are connected through a differential mechanism to position an attitude control surface of an aircraft in response to common or separate command signals applied to the respective channel... | 06/13/1978 |
| 4084774 | Redundant off-axis sensor assemblies An assembly of single-component motion sensors consists of four equinumerous groups of sensors. All the sensors in any one group have their measurement axes parallel and the directions of the measurement axes of the four groups are parallel to the diagona... | 04/18/1978 |
| 4082238 | Aircraft control system providing hardover protection and full control authority In a helicopter a servo system connected to operate in parallel with the rotor blade pitch controlling linkages and also to receive autopilot generated signals directing maneuvers. The system limits the autopilot control over the blade pitch or position i... | 04/04/1978 |
| 4079906 | Servo-control device for controlling a control surface of an aircraft In a servocontrol device for controlling a control surface of an aircraft, which device is associated with a mechanical control member such as control column, wheel, pedals, and which comprises two identical double-acting hydraulic rams, integral with eac... | 03/21/1978 |
| 4078750 | Speed-variable limits in fail-safe actuators A positioning device for a critical aircraft surface, such as a stabilizing elevator in a helicopter, includes a pair of reversible electric jack-screw type actuators acting in series, each being controlled in a closed-loop fashion by separate electronic ... | 03/14/1978 |
| 4063140 | Method and apparatus for limiting position servo authority Method and apparatus for limiting the authority of a position servo system over an aircraft control surface. The amplitude of the energizing signal delivered to the actuator portion of the servo system is limited in accordance with a non-constant function... | 12/13/1977 |
| 4055135 | Rudder error detector Apparatus for detecting malfunctions in rudder-type steering systems utilizes electrical order and rudder angle signals. The rudder-order signal is applied to a closed-loop simulator that includes integrating apparatus adjusted to provide a time-variant s... | 10/25/1977 |
| 4043526 | Autopilot hardover failure protection system A system for rapidly disengaging, with minimum nuisance disengagements, a nventional autopilot system upon detecting hardover failure, which is defined as any autopilot failure which results in rapid and sustained displacement of an aircraft aerodynamic c... | 08/23/1977 |
| 4035705 | Fail-safe dual channel automatic pilot with maneuver limiting Two substantially identical servo channels, coupled through a differential mechanism, position an attitude control surface of an aircraft in response to a common command signal applied to both channels. The common command is coupled to each channel throug... | 07/12/1977 |
| 4034334 | Airfoil position range selecting, indicating and warning system for an aircraft To assure takeoff controllability of aircraft of the type having movably mounted stabilizers, a plurality of different stabilizer position ranges are established, any one of which may be selected by a range selector switch operated by the pilot. Proper pi... | 07/05/1977 |
| 4032094 | Control of positioning system authority over aircraft control surfaces as a function of surface movement rate Method and apparatus for controlling aircraft flight control surfaces. A signal indicative of control surface movement rate is provided and tested for level and duration. When said rate indicative signal exceeds a predetermined level for a predetermined t... | 06/28/1977 |
| 4025193 | Apparatus suitable for use in orienting aircraft in-flight for refueling or other purposes A modulated light beam is projected from a transmitter aircraft toward a receiver aircraft and reflected back toward the receiver aircraft by a retroreflector mounted on the receiver aircraft. The reflected light beam is received by the transmitter aircra... | 05/24/1977 |
| 4017045 | Flap compensation system for use when controlling the pitch attitude of an aircraft A flap compensation system is provided which reduces the pilot applied force required to hold the pitch attitude of an aircraft within specified limits upon pilot operation of the aircraft flaps by automatically displacing the horizontal stabilizer of the... | 04/12/1977 |
| 4009464 | Apparatus for indicating attitude failure Apparatus for indicating attitude failure in an attitude indicator system in which energy is stored and isolated from all other apparatus during normal operation and transferred to the attitude indicator when attitude failure is detected, resulting in an ... | 02/22/1977 |
| 3979579 | Aircraft engine fatigue cycle recorder In an aircraft, a system for recording aircraft fatigue cycles senses engine starting, engine shutdown, landing gear status, engine reversal and throttle setting and derives therefrom unit and fractional cycles. The system includes a first memory responsi... | 09/07/1976 |
| 3958522 | Automatic control system for hydrofoil craft A control system for hydrofoil craft is one in which control surfaces are moved automatically in response to signals derived from the motion of the craft to stabilize and control the craft. In such systems, a potentially dangerous condition can occur in c... | 05/25/1976 |
| 3955783 | Hydraulic actuating arrangement for aircraft control surfaces A hydraulic actuating arrangement for an aircraft control surface has a control circuit, responsive to a position selection input signal, for providing six nominally identical output control signals. Six pilot valves respectively responsive to the control... | 05/11/1976 |
| 3940094 | Wing sweep control system A system for controlling the wing sweep angle of the wings of an aircraft over their entire sweep range, including a detector for determining aircraft speed and altitude, a digital computer for receiving signals from the detector to produce output signals... | 02/24/1976 |
| 3936715 | Electronic trim system A system for electrically actuating the pitch trim of an aircraft in both autopilot and manual modes includes a primary pitch servomotor coupled to a primary control surface and a pitch trim servomotor for actuating a trim control surface. In the autopilo... | 02/03/1976 |
