Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Reexamination Certificate
2005-11-01
2005-11-01
Barefoot, Galen (Department: 3644)
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
C244S11700R, C188S377000, C267S140000
Reexamination Certificate
active
06959894
ABSTRACT:
An impact resistant structure of a helicopter having an energy absorber positioned under a floor of the helicopter and directly connected to a cabin frame of the helicopter. The energy absorber is arranged in accordance with a distribution of a ground reaction force on a general ground at a time of crash situation. The energy absorber also includes a plurality of independent hollow tubes of fiber reinforced composite material integrally formed by bundling only the hollow tubes. The hollow tubes are arranged so as to reduce a number of intersecting wall surfaces of the hollow tubes.
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Richard L. Boitnott et al., “Full-Scale Crash Test of the Sikorsky Advanced Composite Airframe Program Helicopter” US Army Research Laboratory, Vehicle Technology Directorate, MRJ Technology Solutions, Fairfax, VA.
Barefoot Galen
Kawasaki Jukogyo Kabushiki Kaisha
Oliff & Berridg,e PLC
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