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Hydrodynamic and Aerodynamic Characteristics of a Model of a Supersonic Multijet Water-Based Aircraft Equipped with Supercavitating HydrofoilsThe hydrodynamic and aerodynamic characteristics of a model of a multijet water-based Mach 2.0 aircraft equipped with hydrofoils have been determined. Takeoff stability and spray characteristics were very good, and sufficient excess thrust was available for takeoff in approximately 32 seconds and 4,700 feet at a gross weight of 225,000 pounds. Longitudinal and lateral stability during smooth-water landings were good. Lateral stability was good during rough-water landings, but forward location of the hydrofoils or added pitch damping was required to prevent diving. Hydrofoils were found to increase the aerodynamic lift-curve slope and to increase the aerodynamic drag coefficient in the transonic speed range, and the maximum lift-drag ratio decreased from 7.6 to 7.2 at the cruise Mach number of 0.9. The hydrofoils provided an increment of positive pitching moment over the Mach number range of the tests (0.6 to 1.42) and reduced the effective dihedral and directional stability.
Document ID
19980228450
Acquisition Source
Headquarters
Document Type
Technical Memorandum (TM)
Authors
McKann, Robert E.
(NASA Langley Research Center Hampton, VA United States)
Blanchard, Ulysse J.
(NASA Langley Research Center Hampton, VA United States)
Pearson, Albin O.
(NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1960
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NASA-TM-X-191
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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