Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Nonmetallic resilient mounting
Patent
1999-05-27
2000-10-03
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Nonmetallic resilient mounting
416143, 416168R, 416230, 416239, B64C 2750
Patent
active
061263982
ABSTRACT:
A rotor blade for a bearingless rotor of a helicopter includes a lift-generating airfoil blade, a flexbeam connecting the airfoil blade to a rotor head, and a control sleeve enclosing the flexbeam. The junction between the flexbeam and the airfoil blade is a separable junction (J) to allow the airfoil blade to be folded in a simple manner while maintaining a high lead-lag stiffness and reduced structural height of the junction (J). The junction (J) is formed by two connection arms (5.1, 5.2) arranged side-by-side in the lead-lag plane (E.sub.R) of the rotor blade (R). Preferably, the two connection arms extend from the inboard end of the airfoil blade (3) and receive the head (1.1) of the flexbeam (1) therebetween lying in the lead-lag plane (E.sub.R). A connecting fixture (6) connects the connection arms (5.1, 5.2) to the flexbeam head (1.1) using fasteners such as bolts (V.sub.1, V.sub.2) that are spaced laterally from each other at a spacing distance of at least 1.3 times the maximum width of the torsionally flexible portion of the flexbeam.
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"The Bearingless Main Rotor", by Franklin D. Harris et al.; Proceedings of the European Rotorcraft and Powered Lift Aircraft Forum, France; Sep. 7-9, 1977, Paper No. 4; pp. 4-1 to 4-9.
Bauer Karl
Kuntze-Fechner Gerald
Eurocopter Deutschland GmbH
Fasse W. F.
Fasse W. G.
Look Edward K.
McDowell Liam
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