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Vibration in the framework then coupled with a helicopter phenomenon known as ground resonance. [3] The vibration was sufficient to cause a structural failure as the starboard rear helicopter broke off its mounting, its rotors cutting into the gasbag. [3] The unbalanced lift then made the vibrations worse and the remaining three helicopters ...
Intermeshing twin rotors of a Kaman K-Max Video of K-Max helicopter in flight, showing the meshing main rotors in motion. Intermeshing rotors on a helicopter are a set of two rotors turning in opposite directions with each rotor mast mounted on the helicopter with a slight angle to the other so that the blades intermesh without colliding.
Proper maintenance of the helicopter's damping system components can prevent ground resonance from taking hold. When it does occur, recovery is often possible if action is taken quickly. If sufficient rotor RPM exists, immediate takeoff can restore rotor balance by allowing the airframe to move and help dampen the oscillation freely. [1]
The Kaman HH-43 Huskie is a helicopter developed and produced by the American rotorcraft manufacturer Kaman Aircraft. [2] It is perhaps most distinctive for its use of twin intermeshing rotors, having been largely designed by the German aeronautical engineer Anton Flettner.
In 2001, testing of Mi-38's rotor blades was carried out on a Mi-17 helicopter. The first Mi-38 demonstrator (PT-1) performed its maiden flight above the Kazan Helicopters plant on 22 December 2003. [5] The second prototype (OP-2), powered by Pratt & Whitney Canada PW127/TS engines, made its first flight on 2 December 2010.
The MD Helicopters MD Explorer is a twin engined utility helicopter; it is equipped with a fully-articulated five-bladed main rotor system as well as bearingless composite flexbeams and rotor hub. The fuselage is composed of composite materials , such as carbonfibre , that are resistant to corrosion even in hostile marine environments, it also ...
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The Boeing Vertol CH-46 Sea Knight is a medium-lift tandem-rotor transport helicopter, furnished with a set of counter-rotating main rotors in a tandem-rotor configuration. It was typically powered by a pair of General Electric T58 turboshaft engines, which were mounted on each side of the rear rotor pedestal; power to the forward rotor was ...