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Along with the Alouette III, the Cheetah was a key product for HAL; experience from manufacturing the type aided in the later development of more advanced indigenous helicopters such as the HAL Dhruv. [5] During the 1990s, HAL developed an armed light attack helicopter based upon the Cheetah, which was given the name Lancer. [6] [7]
BK 117 in 2018 In service as an air ambulance, 2008. During 1983, the initial production version, designated as the BK 117A-1 was first delivered. [5] Improved variants were quickly developed; in early 1985, the BK 117A-3, featuring an increased maximum takeoff weight and an enlarged tail rotor with twisted airfoils, was certified; two years later, the BK 117A-4, equipped with LTS 101-750B-1 ...
The FAA states "The height–velocity diagram or H/V curve is a graph charting the safe/unsafe flight profiles relevant to a specific helicopter. As operation outside the safe area of the chart can be fatal in the event of a power or transmission failure it is sometimes referred to as the dead man's curve."
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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.
It was the first light commercial twin-turbine helicopter developed in the United States. [ 4 ] The Bell 222 incorporated a number of advanced features, including dual hydraulic and electrical systems, sponsons housing the retractable landing gear , and the Noda Matic vibration reduction system developed for the Bell 214ST .
The Boeing CH-47 Chinook is a tandem-rotor helicopter originally developed by American rotorcraft company Vertol and now manufactured by Boeing Defense, Space & Security.The Chinook is a heavy-lift helicopter that is among the heaviest lifting Western helicopters.
Advanced Supersonic Transport (AST) model in wind tunnel. The aircraft design process is a loosely defined method used to balance many competing and demanding requirements to produce an aircraft that is strong, lightweight, economical and can carry an adequate payload while being sufficiently reliable to safely fly for the design life of the aircraft.