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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 transport category helicopter is permitted to have only one main rotor head, and may have only one engine. If a transport category helicopter has only one engine it is only eligible to be a Class B (or Performance Group 2) helicopter. An example of a transport category helicopter with only one engine is the Bell 204/205.
The term is an aircraft classification used by the International Civil Aviation Organization (ICAO) and the United States' FAA: Powered-lift. A heavier-than-air aircraft capable of vertical take-off, vertical landing, and low-speed flight, which depends principally on engine-driven lift devices or engine thrust for the lift during these flight ...
Most-produced Western helicopter; nicknamed "Huey". UH-1Y derivative in production. 1959–1976 Bell 206 Jetranger: 8,460: manufactured at Bell plants in United States and Canada: Also made under licence by Agusta in Italy and Commonwealth Aircraft Corporation in Australia: 1966–2010 Eurocopter AS350: 7,000 + [1] France: Airbus Helicopters ...
Rotorcraft generally include aircraft where one or more rotors provide lift throughout the entire flight, such as helicopters, gyroplanes, autogyros, and gyrodynes Compound rotorcraft augment the rotor with additional thrust engines, propellers, or static lifting surfaces. Some types, such as helicopters, are capable of vertical takeoff and ...
However, the rear rotor works in the aerodynamic shadow of the front rotor, which reduces its efficiency. This loss can be minimized by increasing the distance between the two rotor hubs, and by elevating one hub over the other. [4] [5] Tandem-rotor helicopters tend to have a lower disk loading than single-rotor helicopters. [6]
The Transcendental 1-G is the first tiltrotor aircraft to have flown and accomplished most of a helicopter to aircraft transition in flight (to within 10 degrees of true horizontal aircraft flight). Built in 1953, the experimental Bell XV-3 flew until 1966, proving the fundamental soundness of the tiltrotor concept and gathering data about ...
A coaxial-rotor aircraft is an aircraft whose rotors are mounted one above the other on concentric shafts, with the same axis of rotation, but turning in opposite directions (contra-rotating). This rotor configuration is a feature of helicopters produced by the Russian Kamov helicopter design bureau .