Hub spring moment isolation in underslung two-bladed teetering r

Details Hub spring moment isolation in underslung two-bladed teetering r Hub spring moment isolation in underslung two-bladed teetering r

1974-04-12

1978-09-19

Kelmachter, Barry L.

Fluid reaction surfaces (i.e., impellers)

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

Nonmetallic resilient mounting

244 1727, B64C 1112

Patent

active

041150317

ABSTRACT:
A method and system which isolates two-per-rev hub spring moment vibrations while providing control power during zero-g flight in a two-bladed teetering rotor helicopter. Hub spring structure is connected between the rotor and the pylon to resist rotor flapping about the teeter axis and thus provide control during zero-g flight. To isolate from the fusilage the hub spring moment two-per-rev vibrations, the rotor is coupled to the pylon below the rotor center of gravity at a distance related to both the hub spring rates and the in-plane frequency of the helicopter blades.

REFERENCES:
patent: 2949965 (1960-08-01), De Tore et al.
patent: 3288226 (1966-11-01), Lemont et al.
patent: 3804552 (1974-04-01), Covington
patent: 3807896 (1974-04-01), Johnson

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