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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 .
The coaxial rotor design was chosen because with the rotors turning in opposite directions the torque from one rotor was canceled out by the torque produced by the other rotor. The two twin-bladed rotors made of metal were shaped like arrows and incorporated both cyclic and collective pitch blade control, with which movement around the pitch ...
The Rotorfly R-30 helicopter is a coaxial helicopter with two two-blade fiberglass rotors. The control rods of the upper main rotor are located inside the shaft which reduces turbulence, It has been described as a hingeless teetering blade mount. [2] The aircraft claimed to be very quiet in general. [5]
Sikorsky has said that the X2 design is not suitable for heavy-lift size, and instead suggests the CH-53K for heavy-lift and tiltrotor for the ultra-class. [28] However, Sikorsky plans to build the 30,000-pound-class (14,000 kg) JMR-TD (with a cabin 50% larger than the Black Hawk ) at full scale to remove doubts about the scalability of the X-2 ...
The Kamov Ka-50 "Black Shark" (Russian: Чёрная акула, romanized: Chyornaya akula, English: kitefin shark), NATO reporting name Hokum A, is a Soviet/Russian single-seat attack helicopter with the distinctive coaxial rotor system of the Kamov design bureau.
The CoAX 2D/2R was originally known as the FLIP 2 (Fly In Perfection) and is a derivative of the FLIP 1, a conventional helicopter with a main and tail rotor.[1]The CoAX 2D/2R was designed to comply with the European Class 6 microlight helicopter rules, including the category's maximum takeoff weight of 450 kg (992 lb).