Helicopter

Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes

Reexamination Certificate

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Details

C244S012400, C244S017270

Reexamination Certificate

active

07128293

ABSTRACT:
A helicopter has a power unit supported on an arch support member above an airframe. The power unit may be moved forward and rearward by a trim actuator to trim the helicopter and tilted about pitch and roll axes by control actuators for directional control. The control actuators may form a parallelogram linkage with the arms of the arch support member. Each control actuator may comprise a hydraulic cylinder having two cavities and a pair of pistons which further divide each cavity into a pair of volumes. The arch support member and landing gear assemblies may connect to transversely extending struts. The landing gear assemblies may be designed to progressively deform in case of a high impact landing.

REFERENCES:
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patent: 3722830 (1973-03-01), Barber
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patent: 6182923 (2001-02-01), Weinhart
patent: 6293492 (2001-09-01), Yanagisawa
patent: 6460802 (2002-10-01), Norris
patent: 2002/0125368 (2002-09-01), Phelps et al.
patent: 2061823 (1992-02-01), None
patent: 403021593 (1991-01-01), None
patent: WO02/062661 (2002-08-01), None
International Search Report for PCT/CA2004/002060 dated Jan. 2004, International Searching Authority, May 12, 2006, pp. 1-3.

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