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Technical Note: UH‐60A Airloads Program Azimuth Reference Correction

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Abstract:

Recent investigation of airloads data from the Army/NASA UH‐60A Airloads Program has revealed an important error in the azimuthal reference used for comparison with rotorcraft analyses. A 7° difference exists between flight test and analysis reference systems because of the offset of the elastomeric bearing from the hub axis. Most previously published data applied this 7° shift in the wrong direction. Correction to published data, therefore, requires a 14° shift to the left for azimuthally referenced data. The correction of the reference error has significantly improved correlation of comprehensive and especially coupled CFD analyses with the UH‐60A Airloads Program data. Most publications prior to January 2005 utilize data with the incorrect azimuth reference. A list of affected Army/NASA publications is included in this paper.

Document Type: Research Article

DOI: http://dx.doi.org/10.4050/1.3092857

Affiliations: Flight Vehicle Research and Technology Division, NASA Ames Research Center, Moffett Field, CA

Publication date: April 1, 2005

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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