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Application of the Joined Wing to Tiltrotor Aircraft

Application of the Joined Wing to Tiltrotor Aircraft

          
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About the Book

A study was made to determine the potential speed improvements and other benefits resulting from the application of the joined wing concept to tiltrotor aircraft. Using the XV-15 as a baseline, the effect of replacing the cantilever wing by a joined-wing pair was studied. The baseline XV-15 cantilever wing has a thickness/chord ratio of 23 percent. It was found that this wing could be replaced by a joined-wing pair of the same span and total area employing airfoils of 12 percent thickness/chord ratio. The joined wing meets the same static strength requirements as the cantilever wing, but increases the limiting Mach Number of the aircraft from M=0.575 to M=0.75, equivalent to an increase of over 100 knots in maximum speed. The joined wing configuration studied is lighter than the cantilever and has approximately 11 percent less wing drag in cruise. Its flutter speed of 245 knots EAS is not high enough to allow the potential Mach number improvement to be attained at low altitude. The flutter speed can be raised either by employing rotors which can be stopped and folded in flight at speeds below 245 knots EAS, or by modifying the airframe to reduce adverse coupling with the rotor dynamics. Several modifications of wing geometry and nacelle mass distribution were investigated, but none produced a flutter speed above 260 knots EAS. It was concluded that additional research is required to achieve a more complete understanding of the mechanism of rotor/wing coupling. Wolkovitch, Julian and Wainfan, Barnaby and Ben-Harush, Yitzhak and Johnson, Wayne Unspecified Center AERODYNAMIC CONFIGURATIONS; AIRFRAMES; JOINED WINGS; ROTOR DYNAMICS; VELOCITY; XV-15 AIRCRAFT; DRAG; FLUTTER; FOLDING; IMPROVEMENT; LOW ALTITUDE; MACH NUMBER; MASS DISTRIBUTION; NACELLES; ROTORS...


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Product Details
  • ISBN-13: 9781730982231
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 279 mm
  • No of Pages: 104
  • Spine Width: 6 mm
  • Width: 216 mm
  • ISBN-10: 1730982239
  • Publisher Date: 07 Nov 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 263 gr


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