Coaxial rotor system for helicopters

Details Coaxial rotor system for helicopters Coaxial rotor system for helicopters

2011-04-26

2011-04-26

Kershteyn, Igor (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Plural impellers having relative movement or independent...

Coaxial rotation

C416S129000, C416S136000, C416S172000, C416S179000, C416S189000

Reexamination Certificate

active

07931439

ABSTRACT:
An improved coaxial rotor assembly for a helicopter includes an upper rotor system having a multiple of upper rotor blades each having outer tips and mounted on and extending outwards from a central rotor shaft and a lower rotor system having a multiple of lower rotor blades each having outer tips and mounted on and extending outwards from the central rotor shaft with the upper rotor system spaced an axial distance from the lower rotor system on the central rotor shaft. A rotor blade support ring extends circumferentially around each of the upper and lower rotor systems which movably engages and supports the outer tips of the upper and lower rotor blades in spaced apart relation such that the upper and lower rotor systems rotate in opposite directions and the rotor blade support ring means prevents contact between the upper and lower rotor systems during operation thereof.

REFERENCES:
patent: 2425904 (1947-08-01), Vernon
patent: 2478206 (1949-08-01), Redding
patent: 2835332 (1958-05-01), Fry
patent: 3830587 (1974-08-01), Shipes et al.
patent: 4767270 (1988-08-01), Seidel

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