Variable-pitch multi-blade propeller incorporating individually

Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Nonmetallic resilient mounting

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416168R, 416226, 416229R, B64C 1106

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046261729

ABSTRACT:
Each blade is fixed to the hub by the root part of the spar, arranged in the form of a loop surrounding a connection element bolted on the hub, with the interposition of rigid rings by a pin simultaneously fixing the hub on a drive sleeve transmitting thereto the driving torque of the central shaft. The hub comprises two coaxial cylindrical walls in each of which is pierced, for each blade, a circular opening in which the member for controlling the angle of attack which is fast with the blade root is mounted to rotate via self-lubricating rings. The invention is particularly applicable to helicopters.

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patent: 3765267 (1973-10-01), Bourquardez et al.
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patent: 3962506 (1976-06-01), Dunahoo
patent: 4281966 (1981-08-01), Duret et al.
patent: 4302155 (1981-11-01), Grimes et al.
patent: 4306837 (1981-12-01), Brogdon et al.
patent: 4332525 (1982-06-01), Cheney, Jr.

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