Performance Characteristics Of A 4 Foot Diameter Ducted Fan At Zero Angle Of Attack For Several Fan Blade Angles
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Aerodynamic Characteristics of a 4-foot-diameter Ducted Fan Mounted on the Tip of a Semispan Wing
| Author | : Kenneth W. Mort |
| Publisher | : |
| Total Pages | : 38 |
| Release | : 1962 |
| Genre | : Airplanes |
| ISBN | : |
Power, free-stream velocity, and duct angle of attack were varied at several wing angles of attack to define the aerodynamic characteristics of the ducted fan, wing, and of the ducted fan wing together. At large duct angles of attack, the inside of the upstream duct lip stalled causing a rapid change in the duct pitching moments and an accompanying increase in the power required. At low horizontal velocities, this lip stall would probably limit the rate of descent of a vehicle with a wing-tip-mounted ducted fan. During low-speed, level, unaccelerated flight (30 to 80 knots) it appeared that a vehicle, with a configuration similar to that examined, would require less power if it were supported by a wing and ducted fans than if it were supported only by ducted fans. (Author).
Large-scale Wind-tunnel Investigation of a Ducted-fan -- Deflected-slipstream Model with an Auxiliary Wing
| Author | : Michael D. Falarski |
| Publisher | : |
| Total Pages | : 60 |
| Release | : 1971 |
| Genre | : Short take-off and landing aircraft |
| ISBN | : |
The longitudinal aerodynamic characteristics of a semispan wing dellected-slipstream configuration with a double-slotted flap and and auxiliary wing were determined. The model was powered by two low-pressure-ratio ducted fans. A comparison of static test results with results obtained from various propeller-driven configurations indicates that the turning effectiveness of fan-powered deflected-slipstream configurations can be correlated with propeller-powered configurations with the same flap-chord to slipstream-diameter ratio. The turning effectiveness of the auxiliary wing was essentially the same as would be produced by a conventional slotted flap system with the same flap-chord to slipstream-diameter ratio. The auxiliary wing reduced the thrust required at low speeds as would be expected due to the increase in lifting surface area.
NASA Scientific and Technical Reports
| Author | : United States. National Aeronautics and Space Administration Scientific and Technical Information Division |
| Publisher | : |
| Total Pages | : 2300 |
| Release | : 1967 |
| Genre | : Aeronautics |
| ISBN | : |
Cumulative Title Index to United States Public Documents, 1789-1976
| Author | : Daniel W. Lester |
| Publisher | : |
| Total Pages | : 774 |
| Release | : 1981 |
| Genre | : Government publications |
| ISBN | : |
