Increasing lift on helicopter rotor blades and aircraft propelle

Details Increasing lift on helicopter rotor blades and aircraft propelle Increasing lift on helicopter rotor blades and aircraft propelle

1991-02-08

1992-12-01

Marmor, Charles A.

Aeronautics and astronautics

Aircraft, heavier-than-air

Helicopter or auto-rotating wing sustained, i.e., gyroplanes

244 23C, 416128, B64C 2710

Patent

active

051673843

ABSTRACT:
A rotary airscrew having a central hub with coaxial first and second counter-rotating drive shafts, a first set of a plurality of non-lift blades connected to the first drive shaft for rotation to be rotated for moving air therewith, a second set of a plurality of primary airfoil blades connected to the second drive shaft, to be rotated counter to the rotation direction of the plurality of non-lift blades, and spaced apart from the non-lift blades with a small clearance distance to allow non-contacting counter-rotation, and a ring for supporting the first and second sets of blades with a small clearance distance between the ends as they are rotated.

REFERENCES:
patent: 1056288 (1913-03-01), MacIntosh
patent: 2835332 (1958-05-01), Fry
patent: 3054578 (1962-09-01), Brocard
patent: 3127093 (1964-03-01), Sudrow
patent: 3477168 (1969-11-01), Trodglen, Jr.
patent: 3606209 (1971-09-01), Rosta et al.
patent: 3677503 (1972-07-01), Freeman, Jr.
patent: 4913376 (1990-04-01), Black

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