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HELRAS or the Helicopter Long Range Active Sonar is a naval helicopter undersea sensor, a dipping sonar (a form of towed array sonar), ...
The sound barrier or sonic barrier is the large increase in aerodynamic drag and other undesirable effects experienced by an aircraft or other object when it approaches the speed of sound. When aircraft first approached the speed of sound, these effects were seen as constituting a barrier, making faster speeds very difficult or impossible.
With helicopter's a tail strike can mean that the tail rotor itself, boom, or tailfin are damaged by contact. [ 9 ] Another type of danger for helicopters that have a tail boom, is that the main rotor and tail strike each other, which can cause the tail to be cut off and/or damage the main rotor blade.
The sound source will pass by a stationary observer before the observer actually hears the sound it creates. Conical shockwave with its hyperbola-shaped ground contact zone in yellow However, in practical applications, a supersonic aircraft must operate stably in both subsonic and supersonic profiles, hence aerodynamic design is more complex.
Stealth helicopters are helicopters that incorporate stealth technology to decrease an enemy's detection ability. [1] There are a diverse range of technologies used to achieve this decreased detectability; these have largely involved the reduction of several different signatures typically generated by a rotorcraft, including those of noise ...
The Bell AH-1 Cobra is a single-engined attack helicopter developed and manufactured by the American rotorcraft manufacturer Bell Helicopter.A member of the prolific Huey family, the AH-1 is also referred to as the HueyCobra or Snake.
The Airbus Helicopters H225 (formerly Eurocopter EC225 Super Puma) is a long-range passenger transport helicopter developed by Eurocopter as the next generation of the civilian Super Puma family. It is a twin-engined aircraft and can carry up to 24 passengers along with two crew and a cabin attendant, dependent on customer configuration.
The attack helicopters have only to rise from cover briefly to fire their missiles before returning to a concealed location. [7] Late-development of attack helicopters, such as the Mil Mi-28N, the Kamov Ka-52, and the AH-64D Longbow, incorporate sensors and command and control systems to relieve the requirement for scout helicopters.