Multi-blade rotor for a helicopter

Details Multi-blade rotor for a helicopter Multi-blade rotor for a helicopter

1998-01-12

2000-03-21

Verdier, Christopher

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Nonmetallic resilient mounting

416140, 416141, 416230A, 416244R, B64C 2733

Patent

active

060395389

ABSTRACT:
A multi-blade rotor arrangement free of flapping hinges, for a rotary wing aircraft, includes a rotor head plate (2) made of fiber-reinforced composite material. The head plate (2) includes a plurality of blade connection arms (4) that are elastically flexibly bendable in the blade flapping direction, and at least one plate segment (16, 18) that holds each blade connection arm on two sides thereof radially spaced away from the rotor center in a manner that allows elastic bending in the blade flapping direction. The plate segment is rigidly connected to the rotor mast (122, 222) at mounting locations (20) that are offset in the circumferential direction from the blade connection arms. In this manner, the elastically yielding flapping connection between the rotor blades and the rotor mast is provided by both the elastic bending of the blade connection arms and the elastic deformation of the plate segment portions between the blade connection arms and the mast mounting locations. The fictitious flapping hinges formed thereby may be located relatively close to the rotor center, namely spaced away from the rotor center by about 5% of the rotor radius.

REFERENCES:
patent: 4182597 (1980-01-01), Derschmidt
patent: 4345876 (1982-08-01), Schwarz et al.
patent: 4352631 (1982-10-01), Buchs et al.
patent: 4369018 (1983-01-01), Brunsch et al.
patent: 4568244 (1986-02-01), Wehnert et al.
patent: 5263821 (1993-11-01), Noehren et al.

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