Energy absorbing airframe for a vertical lift vehicle

Details Energy absorbing airframe for a vertical lift vehicle Energy absorbing airframe for a vertical lift vehicle

2007-04-03

2007-04-03

Barefoot, Galen (Department: 3644)

Aeronautics and astronautics

Aircraft, heavier-than-air

Helicopter or auto-rotating wing sustained, i.e., gyroplanes

C244S054000, C244S119000, C244S120000, C244S017270

Reexamination Certificate

active

11064612

ABSTRACT:
An airframe includes an energy absorbing structure with a frame, a beam mounted to the frame at a rotational joint and a collapsible member. In response to reaching a predetermined threshold load value during a high sink rate impact event, the collapsible member will collapse under an aft section of the upper deck. The rotational joint operates as a virtual hinge such that a forward section of the upper deck deforms in a predictable manner. As the upper deck supports the high mass systems, the high mass components are less likely to separate from their mounting and penetrate into the crew compartment and the main rotor system will tilt aft away from the crew compartment to minimize the likelihood that the rotor blades may penetrate the crew compartment.

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