Fast hybrid helicopter with long range with longitudinal...

Aeronautics and astronautics – Aircraft control – Automatic

Reexamination Certificate

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C244S006000, C244S017130, C244S195000

Reexamination Certificate

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08052094

ABSTRACT:
A hybrid helicopter includes an airframe provided with a fuselage and a lift-producing surface together with stabilizer surfaces and a drive system including:a mechanical interconnection system between a rotor of radius (R) with collective pitch and cyclic pitch control of the blades of the rotor and at least one propeller with collective pitch control of the blades of the propeller; andat least one turbine engine driving the mechanical interconnection system. The hybrid helicopter includes first members for controlling the angle at which the at least one pitch control surface is set as a function of the bending moment exerted on the rotor mast relative to the pitch axis of the hybrid helicopter, and second members for controlling the cyclic pitch of the blades of the rotor in order to control the longitudinal trim of the hybrid helicopter as a function of flight conditions.

REFERENCES:
patent: 3075727 (1963-01-01), Ellis et al.
patent: 4103848 (1978-08-01), Johnson et al.
patent: 4304375 (1981-12-01), Builta et al.
patent: 7451949 (2008-11-01), Eglin
patent: 7970498 (2011-06-01), Sahasrabudhe et al.
patent: 2008/0237392 (2008-10-01), Piasecki et al.

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