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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]
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."
[1] [2] Unlike fixed-wing aircraft, of which the stall occurs at relatively low flight speed, the dynamic stall on a helicopter rotor emerges at high airspeeds or/and during manoeuvres with high load factors of helicopters, when the angle of attack(AOA) of blade elements varies intensively due to time-dependent blade flapping, cyclic pitch and ...
Aircraft Origin Type Variant In service Notes Helicopters; Boeing AH-64: United States attack AH-64E(I) 6 on order [44]: HAL Prachand: India attack: 90 on order [29]: HAL Rudra
Ordered by model number, Lockheed gave most of its aircraft astronomical names, from the first Vega to the C-5 Galaxy. Aircraft models listed in italics and with higher numbers – 780 following 80 and preceding 81 , for example – are variants or developments of the base model.
Aircraft categories are also defined with respect to the certification of aircraft, to mean "a grouping of aircraft based upon intended use or operating limitations." Examples include transport, normal, utility, acrobatic, limited, restricted, and provisional. [3]
Aerodrome reference point ARTCC Air route traffic control centers ASAS Airborne Separation Assurance System ASD Aircraft situation display ASDA Accelerate Stop Distance Available: ASDE-X Airport Surface Detection Equipment, Model X: ASDL Aeronautical satellite data link ASI Airspeed indicator: ASL Above sea level [1] ASLO
For a helicopter that is hovering, the aerodynamic force is vertical and exactly balances the helicopter weight, with no lateral force. The downward force on the air flowing through the rotor is accompanied by an upward force on the helicopter rotor disk. The downward force produces a downward acceleration of the air, increasing its kinetic energy.