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The FanWing is a type of aircraft rotor wing in which a horizontal-axis cross-flow fan is used in close conjunction with a fixed wing. The fan forces airflow over the fixed surface to provide both lift and forward thrust. The concept was initially developed around 1997 by designer Patrick Peebles and is under development by his company FanWing ...
The Edgley EA-7 Optica is a British light aircraft designed for low-speed observation work, and intended as a low-cost alternative to helicopters.The Optica has a loiter speed of 130 km/h (70 kn; 81 mph) and a stall speed of 108 km/h (58 kn; 67 mph).
The Verticraft Verticar of 1961 was a similar single-fan, directed-thrust, all-wing (or lifting body) aircraft, of conventional but very low-aspect-ratio wing planform. It failed to fly. A tandem-fan version was proposed but never built. [5] By contrast the Ryan XV-5 Vertifan of 1964 was an otherwise conventional delta-wing jet. It had a large ...
The aircraft's wings and horizontal tail surfaces were taken from a Grumman American AA-1, while the vertical tail surfaces were new. [3] [4] At first the fan was ungeared, which resulted in high noise levels. The engine was replaced by a 110 kW (150 hp) engine in 1974, and considerable testing was carried out with various designs of fans and ...
The Ryan XV-5 and the F-35B use relatively smaller lift fans, either fan-in-fuselage or fan-in-wing, with very high disc loading. According to the momentum theory of the ducted fan, [ 2 ] [ 4 ] high disc loading leads to low hovering efficiency (see power vs disc loadings , JSF fan), so the F-35B can hover for only a short time, at the cost of ...
A fan air modulating valve (FAMV) varies the cooling airflow to control the final air temperature of the service bleed air. Notably, the Boeing 787 does not use bleed air to pressurize the cabin. The aircraft instead draws air from dedicated inlets, located ahead of the wings. [2] [3]
The engine power setting determined the lift from the fans, as fan RPM was determined by the exhaust output from the J85 engines and the load on the fan. [2] Roll control was by differential actuation of the wing-fan exit louvers. Aircraft performance was subsonic, with delta wings superficially similar to those on the Douglas A-4 Skyhawk.
British researchers had found that the amount of electrical power required to camouflage an aircraft's underside in daylight was prohibitive; and that externally mounted light projectors (following the Canadian approach) unacceptably disturbed the aircraft's aerodynamics. [3] Yehudi lights were tested in B-24 Liberators from 1943.
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