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Technical note gyroscopic feathering moments and the 'Bell stabilizer bar' on helicopter rotors

Technical note gyroscopic feathering moments and the 'Bell stabilizer bar' on helicopter rotors
Technical note gyroscopic feathering moments and the 'Bell stabilizer bar' on helicopter rotors
Rotor blade feathering moments caused by gyroscopic forces acting during helicopter pitching and rolling motions are identified. The consequent blade elastic feathering gives rise to blade flapping, which reduces the pitch/roll cross-coupling due to the aerodynamic effects imposed by pitch and roll rates. For blades of low feathering stiffness this reduction is considerable. Inclusion of this effect into rotor analyses accounts for some of the difference between calculated cross-coupling and observed flight behaviour. A review of the Bell rotor system shows that the stabilizer bar acts as a blade chordwise extension, and that gyroscopic feathering moments are fundamental to its operation.
0002-8711
69-74
Simons, Ian A
7da0ed04-2363-48fb-939a-35c3b47875e9
Modha, Ajay N
c083740e-9308-4502-9665-617dec97bc94
Simons, Ian A
7da0ed04-2363-48fb-939a-35c3b47875e9
Modha, Ajay N
c083740e-9308-4502-9665-617dec97bc94

Simons, Ian A and Modha, Ajay N (2007) Technical note gyroscopic feathering moments and the 'Bell stabilizer bar' on helicopter rotors. Journal of the American Helicopter Society, 52 (1), 69-74.

Record type: Article

Abstract

Rotor blade feathering moments caused by gyroscopic forces acting during helicopter pitching and rolling motions are identified. The consequent blade elastic feathering gives rise to blade flapping, which reduces the pitch/roll cross-coupling due to the aerodynamic effects imposed by pitch and roll rates. For blades of low feathering stiffness this reduction is considerable. Inclusion of this effect into rotor analyses accounts for some of the difference between calculated cross-coupling and observed flight behaviour. A review of the Bell rotor system shows that the stabilizer bar acts as a blade chordwise extension, and that gyroscopic feathering moments are fundamental to its operation.

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Published date: January 2007

Identifiers

Local EPrints ID: 44090
URI: http://eprints.soton.ac.uk/id/eprint/44090
ISSN: 0002-8711
PURE UUID: 5e08c06a-fdda-4300-a092-919defa2626b

Catalogue record

Date deposited: 13 Feb 2007
Last modified: 24 Jul 2020 16:32

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