23rd Congress of International Council of the Aeronautical Sciences, 8-13 September, 2002, Toronto, Canada
Paper ICAS 2002-6.6.2

DEVELOPING A NEW FLAP FOR A LIGHT UTILITY TRANSPORT AIRCRAFT

B. Eggleston (1), W .D. McKinney (1), J. Banaszek (1), N. S. Choi (1), G. Krolikowski (1), F. Lebrun (1), J. Thompson (1), D. W. Zingg (2), M. Nemec (2), S. De Rango (2)
(1) Found Aircraft of Canada Inc., Parry Sound, Ontario,Canada; (2) University of Toronto Institute of Aerospace Studies, Downsview, Ontario,Canada

Keywords: aircraft, CFD, FAR23, flap design, flight test

The Found Bush Hawk XP is a small, piston-engined utility transport aircraft suitable for bushplane operations. The original version developed in the 1960’s uses a sealed, plain hinged flap. The latest production version increases gross weight by 25% and power by 20% so an improved flap was needed to achieve improvements in takeoff and climb performance. This paper describes the aerodynamic design and development of a new single-slotted flap for the Bush Hawk. The flap shape and locations were optimized using modern CFD methods and wind tunnel tests were bypassed. The features of the flap aerodynamic design, the aircraft structure and drive systems are described. Flight test results are presented for the Bush Hawk XP with the new flap and they show outstanding performance in its category.

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