Ducted Anti-torque rotor with floating blades

Details Ducted Anti-torque rotor with floating blades Ducted Anti-torque rotor with floating blades

1994-09-01

1996-08-06

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

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

Nonmetallic resilient mounting

416168R, B64C 2748

Patent

active

055428185

ABSTRACT:
In the rotor, the pitch lever of each blade is connected to the tab of the pitch control spider by a ball joint mounted on a wrist pin and received with clearance in an oblong opening in a ring. The axially offset bearing surfaces of the cuff of the blade are mounted with a radial clearance in the bearings of the hub on which they swivel about the pitch axis of the blade. These radial clearances enable contacts of the ball joint against the edge of the opening on the side of the ends of its minor axis, but prevent these contacts on the side of the ends of the major axis of the oblong opening.

REFERENCES:
patent: 3594097 (1971-07-01), Mouille et al.
patent: 4439106 (1984-03-01), Ferris et al.
patent: 4626172 (1986-12-01), Mouille
patent: 4626173 (1986-12-01), Mouille et al.
patent: 4639284 (1987-01-01), Mouille
patent: 4815937 (1989-03-01), Aubry et al.
patent: 5156527 (1992-10-01), Pancotti
patent: 5297934 (1994-03-01), Desjardins
patent: 5306119 (1994-04-01), Bandoh et al.
patent: 5383767 (1995-01-01), Aubry
patent: 5415525 (1995-05-01), Desjardins et al.
Proceedings of the nineteenth european rotorcraft forum, 14 Sep. 1993, CERNOBBIO: "A new generation of fenestron fan-in-fin tail rotor on EC 135" .

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