Tail Rotor Design Part II: Structural Dynamics

Authors: Balke, R. W.; Bennett, R. L.; Gaffey, T. M.; Lynn, R. R.

Source: Journal of the American Helicopter Society, Volume 15, Number 4, 1 October 1970 , pp. 16-30(15)

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Abstract:

In this Part II of Tail Rotor Design, the structural dynamics of stiff inplane tail rotor configurations are considered. First, the placement of blade natural frequencies, the method of calculation and the interaction between the natural frequencies and the forcing functions are discussed in detail. Specific design guidelines are presented for two, three, and four blade rotors. Second, the theoretical structural loading of a tail rotor is treated and comparisons of theory and test results are given. Finally, several aeroelastic phenomena associated with tail rotors are discussed, including “tail wagging,“ flutter and divergence, and blade motion stability. Throughout the text, specific problems which have been encountered are noted.

Document Type: Research article

DOI: http://dx.doi.org/10.4050/JAHS.15.16

Affiliations: 1: Bell Helicopter Company, Fort Worth, Texas

Publication date: 1970-10-01

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