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A set of louvered vanes underneath each of the wing fans could vector the thrust fore and aft and provided yaw control. 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.
Lateral bottom view with the annular duct closed off by shutter or louvers. After the aircraft reaches the speed of aerodynamic flight, the annular duct is closed off by shutters mounted at the top and bottom of the duct to form a smooth disc wing. The lift fans stop working and are enclosed in the annular duct during cruise flight.
The Antonov An-72 and Boeing YC-14 also place their engines above the wings, but in a high-lift, or STOL, configuration where the engine exhaust passes over the upper surface of the blown flaps. This placement uses the Coandă effect to give a lower minimum flight speed and decrease the length of runway needed for takeoff and landing.
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 ...
Alternatively the fan flow may be mixed with the turbine exhaust before entering a single propelling nozzle. In another arrangement an afterburner may be installed between the mixer and nozzle. Shaft — The shaft connects the turbine to the compressor , and runs most of the length of the engine.
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“It’s a traffic jam. If things can’t go forward, they're going to stack up," he said. The small intestine, the narrowest part of the system, is at the greatest risk of obstruction and ...
In aeronautics, a ducted fan is a thrust-generating mechanical fan or propeller mounted within a cylindrical duct or shroud. Other terms include ducted propeller or shrouded propeller . [ 1 ] When used in vertical takeoff and landing ( VTOL ) applications it is also known as a shrouded rotor .
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