Aeronautics and astronautics – Aircraft structure – Fuselage and body construction
Patent
1988-09-19
1989-10-03
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft structure
Fuselage and body construction
180268, 280806, 242 7551, 242 55, B64D 2506
Patent
active
048711314
ABSTRACT:
A system for retracting a pilot into an ejection seat during either normal flight or an emergency ejection procedure. A pair of haulback straps are wound on a haulback reel that is rotatably driven by a gas-powered motor. The motor receives pressurized gas from the aircraft's bleed air during normal flight and from a pyrotechnic cool gas generator during an ejection. The rate of gas flow to the motor is controlled by a servovalve. The actual rotational velocity of the haulback reel is measured by a tachometer and compared to a desired haulback velocity profile. A control signal that is proportional to the difference between the actual haulback velocity and the desired haulback velocity is applied to the servovalve so that the desired haulback velocity is achieved. The desired haulback velocity may vary as a function of time from the start of an ejection procedure. The system also includes an acceleration sensor for actuating a haulback reel locking mechanism when excessive g-loads are sensed, a reel lock actuated if the haulback straps unwind from the haulback reel at an excessive rate, and a spring-loaded winding mechanism to apply a relatively small winding torque to the haulback reel to prevent any slack from developing in the haulback straps.
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Bernier Coral A.
Swanson Douglas E.
Barefoot Galen L.
The Boeing Company
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