Aeronautics and astronautics – Aircraft – heavier-than-air – Airplane and helicopter sustained
Patent
1999-05-04
2000-12-19
Carone, Michael J.
Aeronautics and astronautics
Aircraft, heavier-than-air
Airplane and helicopter sustained
244 1719, 244 56, 244 66, B64C 2728
Patent
active
061618004
ABSTRACT:
A tiltrotor aircraft includes a spanwise-flow redirector having a pair of flow-redirection panels respectively mounted on the aircraft's mid-fuselage area for rotation about a panel pivot axis between a stowed position and a deployed position. In the stowed position, each panel is substantially flush with an adjacent surface of the mid-fuselage area. In the deployed position, each panel is raised into the path of one of the inbound spanwise flows generated by the aircraft's rotors during hover operation, whereupon each panel redirects the respective one of the inbound spanwise flows either forward or aft of the other inbound spanwise flow. In this manner, the deployed panels prevent stagnation of the inbound spanwise flow atop the mid-fuselage area while further serving to minimize re-ingestion of merged spanwise flow into the rotors, resulting in decreased airframe download forces, increased rotor thrust, and reduced noise levels during hover operation.
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Michael A. McVeigh, William K. Grauer & David J. Pasiley, "Rotor/Airframe Interactions on Tiltrotor Aircraft," 44th Annual Forum and Technology Display of the American Helicopter Society, Jun. 1988, pp. 43-51, Washington, D.C.
Fort F. Felker, "A Review of Tilt Rotor Download Research," NASA Ames Research Center, Moffett Field, California, U.S.A., Sep. 20-23, 1988, Paper No. 14, pp. 14-1--14-32.
Photograph of XV-15 prototype aircraft circa 1992.
Photograph of XV-15 prototype aircraft (side elevational view) circa 1992.
M. Peryea and T.L. Wood, "Reduction of Tiltrotor Download," Bell Helicopter Textron, Oct. 15, 1992, pp. 1-7.
T.L. Wood and M.A. Peryea, "Reduction of Tiltrotor Download," American Helicopter Society 49th Annual Forum, St. Louis, Mo., May 19-21, 1993.
D.G. Sigl and T.L. Wood, "Improved Understanding of Tiltrotor Download," undated.
Liu John
Mayer Robert J.
McVeigh Michael A.
Bergin James S.
Carone Michael J.
The Boeing Company
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