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Title
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Investigation of the Thwaites Airfoil Principle as Applied to Helicopter Rotor Blades
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Date
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1954
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Index Abstract
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Coming Soon
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Photo Quality
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Undetermined
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Report Number
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WADC TR 53-497
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Creator
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Arnold, L.
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Yuan, S. W.
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Corporate Author
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Lee Arnold Associates, Inc.
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Laboratory
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Aeronautical Research Laboratory
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Extent
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86
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NTRL Accession Number
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AD046678
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Identifier
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AD0046678
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Access Rights
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Unknown
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Distribution Classification
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1
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DTIC Record Exists
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Yes
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Distribution Change Authority Correspondence
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AFAL LTR
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Distribution Change Action Date
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7/6/2004
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Abstract
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A performance calculation has been carried out for the purpose of comparing the Piasecki XH-16 rotor vith the Karman-Yuan rotor. The two rotors ,atre asi%ned identical in size and lifting capacity (rotor diameter 82 ft, gross weight 36600 lbs). The Piasecki rotor blade is equipped with an NACA 0015 airfoil and the Karman-Yuan rotor blade vith an elliptical airfoil of 18% thickness chord ratio and cyclic flap control. The controllable lift distribution along the blade span of the Karman-Yruan rotor is achieved by varying the spanwise flap location and applied boundary layer suction. Due to the high lift coefficient employed in the Karman-Yuan rotor blade it was found that a lower rotational speed can be used to sustain the same gross wieght as does the XH-16.
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Report Availability
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Not available via Contrails
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Date Issued
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1954-01
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Index In
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DTIC
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Type
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report