Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Laminated – embedded member or encased material
Patent
1984-03-19
1986-07-22
Garrett, Robert E.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Laminated, embedded member or encased material
416144, 416226, B64C 2746
Patent
active
046016392
ABSTRACT:
A nodalized rotor system is provided for a multi-bladed helicopter. Equally spaced radial arms each have an inboard flapping section to accommodate beam-wise blade flapping and an outboard flex section to accommodate pitch changes. A blade is coupled to the end of each arm with a cuff and pitch horn rigidly connected to the blade and pivotally connected to its arm in the region of the flapping section. The blade has a concentration of weight over the section of blade extending from about 32% to 42% of the hub-blade radius of running weight four times the running weight at 50% of the hub-blade radius. Said blade has a reduced mass at outboard 30% of the hub-blade radius, at a level of 80% of the running weight at 50% of the hub-blade radius.
REFERENCES:
patent: 1082750 (1913-12-01), Jacomy
patent: 3574484 (1971-04-01), Lamb, Jr.
patent: 3713751 (1973-01-01), Fradenburgh et al.
patent: 3999888 (1976-12-01), Zincone
patent: 4247255 (1981-01-01), De Rosa
patent: 4427340 (1984-01-01), Metzger et al.
Design of Helicopter Rotor Blades for Desired Placement of Natural Frequencies by David A. Peters et al.
Optimum Design of Rotor Blades for Vibration Reduction in Forward Flight by Friedmann et al May 9, 1983.
Hub Loads Reduction by Modification of Blade Torsional Response by Sesi B. R. Kottapalli May 9, 1983.
Helicopter Vibration Reduction by Rotor Blade Modal Shaping by Robert B. Taylor May 1982.
Popelka David A.
Yen Jing G.
Bell Helicopter Textron Inc.
Garrett Robert E.
Kwon John
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