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Abrasion strips on helicopter rotor blades are made of metal, often titanium or nickel, which are very hard, but less hard than sand. When a helicopter flies low to the ground in desert environments, sand striking the rotor blade can cause erosion. At night, sand hitting the metal abrasion strip causes a visible corona or halo around the rotor ...
A Bell UH-1 Iroquois helicopter. A helicopter is a powered rotorcraft with rotors driven by the engine(s) throughout the flight, allowing it to take off and land vertically, hover, and fly forward, backward, or laterally. Helicopters have several different configurations of one or more main rotors.
The subsequent Model 30 helicopter of 1943 showed the design's simplicity and ease of use. The Model 30 was developed into the Bell 47 of 1945, which became the first helicopter certified for civilian use in the United States (March 1946). Produced in several countries, the Bell 47 was the most popular helicopter model for nearly 30 years.
The Bell 407 is a four-blade, single-engine, civil utility helicopter. A derivative of the Bell 206L-4 LongRanger, the 407 uses the four-blade, soft-in-plane design rotor with composite hub developed for the United States Army's OH-58D Kiowa Warrior instead of the two-blade, semi-rigid, teetering rotor of the 206L-4.
He had developed a small helicopter model with coaxial rotors in July 1754 and demonstrated it to the Russian Academy of Sciences. [1] In 1859, the British Patent Office awarded the first helicopter patent to Henry Bright for his coaxial design. From this point, coaxial helicopters developed into fully operational machines as we know them today ...
In 1979, with the purchase of eight by the Civil Air Authority, the 212 became the first U.S. helicopter sold in the People's Republic of China. The ICAO designator for this aircraft as used in a flight plan is "B212". Bell developed the Model 212 further with the Bell 412; the major difference being the composite four-blade main rotor. The ...
Boeing Model 360; Boeing Vertol CH-46 Sea Knight; Boeing CH-47 Chinook; Boeing Vertol YUH-61; Boeing Vertol XCH-62/XCH-62 HLH; Boeing AH-64 Apache; Boeing–Sikorsky RAH-66 Comanche; Boeing X-50 Dragonfly; SkyHook JHL-40; Sikorsky–Boeing SB-1 Defiant
The Eurocopter AS332 Super Puma is a medium-sized utility helicopter, powered by a pair of Turbomeca Makila 1A1 turboshaft engines, which drive the rotorcraft's four-bladed main rotor and five-bladed tail rotor along with a pair of independent hydraulic systems and a pair of electrical alternators. Fuel is housed across six internal fuel tanks ...