Title page for ETD etd-06112002-115347

Type of Document Master's Thesis
Author Intaratep, Nanyaporn
Author's Email Address nintarat@vt.edu
URN etd-06112002-115347
Title The Investigation of an Inboard-Winglet Application to a Roadable Aircraft
Degree Master of Science
Department Aerospace and Ocean Engineering
Advisory Committee
Advisor Name Title
Marchman, James F. III Committee Chair
Devenport, William J. Committee Member
Schetz, Joseph A. Committee Member
  • roadable aircraft
  • aerodynamics
  • conceptual design
  • propeller-induced flow
  • inboard winglet
Date of Defense 2002-05-31
Availability unrestricted
The inboard-winglet concept was examined for its flow characteristics by testing for pressure coefficients over the wing and winglet surface in the Virginia Tech Stability Wind Tunnel over a range of freestream velocity and angle of attack. The results were analytically applied to calculate aircraft performance of a roadable aircraft, Pegasus II, which used the inboard-winglet concept in its design. The results proved that this concept has the potential to increase a wing lift coefficient at the right combination of thrust setting and freestream velocity better than a conventional wing-propeller arrangement. The lift coefficient inside the winglet channel was approximated as 2D in behavior. It is also shown that the winglets produce thrust at a positive-lift wing configuration. In the Pegasus II, the vertical stabilizers act like inboard winglets and produce a thrust component from its resultant force, giving 5.2% improvement in its effective aspect ratio and resulting in an induced-drag decrease. With an application of the new wing concept, the Pegasus II performance is comparable to other general aviation aircraft.
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