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dc.contributor.advisorWood, E.R.
dc.contributor.authorEccles, David M.
dc.dateDecember 1995
dc.date.accessioned2013-04-29T22:49:28Z
dc.date.available2013-04-29T22:49:28Z
dc.date.issued1995-12
dc.identifier.urihttp://hdl.handle.net/10945/31305
dc.description.abstractA detailed comparison of the output from the NPS developed Joint Army/Navy Rotorcraft Analysis and Design (JANRAD) computer code with H-34 and UH-60A flight test data was made in an effort to determine the validity of the code's predictions. Airload distribution across the rotor disk, power required at various airspeeds ranging from hover to cruise, and thrust moment were used as measures of performance. Although a quantitative comparison of airload distribution is difficult to obtain, qualitatively, the predictions are good. JANRAD's power required estimations are correct to within two percent for altitudes below six thousand feet but accuracy suffers at higher altitudes, particularly above ten thousand feet. A correlation between the variation in kinematic viscosity from sea level to ten thousand feet and the accuracy of the power predictions is demonstrated. in the case of the UH-60A, the equivalent flat plate area of the helicopter is shown to be a function of airspeed, significantly impacting the accuracy of the power required prediction. Center of gravity offset from the main rotor's axis of rotation and unsteady inflow effects influence the accuracy of thrust moment predictions.en_US
dc.description.urihttp://archive.org/details/avalidationofjoi1094531305
dc.format.extent72 p.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleA validation of the Joint Army/Navy Rotorcraft Analysis and Design software by comparison with H-34 and UH-60A flight testen_US
dc.typeThesisen_US
dc.contributor.departmentAeronautical Engineering
dc.description.funderNAen_US
dc.description.recognitionNAen_US
dc.description.serviceU.S. Navy (U.S.N.) author.en_US
etd.thesisdegree.nameM.S. in Aeronautical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineAeronautical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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