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Therefore, most propellers use a variable pitch mechanism to alter the blades' pitch angle as engine speed and aircraft velocity are changed. A sailor checks the propeller of a Landing Craft Air Cushion hovercraft. A further consideration is the number and the shape of the blades used.
A hovercraft (pl.: hovercraft [1]), also known as an air-cushion vehicle or ACV, [2] is an amphibious craft capable of travelling over land, water, mud, ice, and various other surfaces. Hovercraft use blowers to produce a large volume of air below the hull, or air cushion, that is slightly above atmospheric pressure. The pressure difference ...
Other terms include ducted propeller or shrouded propeller. [1] When used in vertical takeoff and landing applications it is also known as a shrouded rotor. [2] Ducted fans are used for propulsion or direct lift in many types of vehicle including airplanes, airships, hovercraft, and powered lift VTOL aircraft. The high-bypass turbofan engines ...
Two prototypes were built; JEFF A by Aerojet General in California, JEFF B by Bell Aerospace. [3]JEFF A had four rotating ducted propellers JEFF B had two ducted rear propellers similar to the proposed SK-10 which was derived from the previous Bell SK-5 / SR.N5 hovercraft tested in Vietnam.
The Navy's hovercraft, called Patrol Air Cushion Vehicles, more closely resembled the civilian SK-5s that they were based on while the Army craft had more extensive modifications. Each hovercraft was 38 ft 10 in (11.84 m) long, [13] with a beam of 23 ft 9 in (7.24 m) [13] and a height of 16 ft 6 in (5.03 m) when floating on its air cushion. [3]
1871 Planophore A Farman MF.11, showing the classic Farman configuration with engine between tail booms Buhl A-1 Autogyro, the first pusher autogyro The post-WWII Convair B-36 was unusual in its size, era, number of engines, and combining both propeller and jet propulsion, with six radial piston and four jet engines Typical of many UAVs, the General Atomics MQ-9 Reaper has a propeller at the ...
The first SRN6 Mark 6 Twin Prop hovercraft, also known as "Super 6" was conversion of a SR.N6 Mark 1, that had been used by Hoverlloyd and Pacific Hovercraft. Extended by 9 ft 8 in and given two 10 ft diameter propellers, it launched in 1973. [ 8 ]
Power was provided by four Rolls-Royce Proteus marine turboshaft engines each driving its own lift fan and pylon-mounted steerable propulsion propeller. The SR.N4 was the largest hovercraft then built, designed to carry 254 passengers in two cabins besides a four-lane automobile bay which held up to 30 cars.