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

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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


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

Publication date: 2005-04-01

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