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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 .
Climb and descent is controlled by increasing and decreasing the throttle. The aircraft lacks a tail rotor, as the coaxial, contra-rotating main rotors produce zero net torque. Yawing motion is produced and controlled by electronic gyroscopically-controlled differential electric braking of the main rotors. With its empty weight of 70 kg (154 lb ...
A Soviet Ka-32 helicopter with coaxial contra-rotating rotors, in 1989. Contra-rotating, also referred to as coaxial contra-rotating, is a technique whereby parts of a mechanism rotate in opposite directions about a common axis, usually to minimise the effect of torque.
The Hoppi-Copter was a functional backpack helicopter developed by the American company Hoppi-Copters Inc. founded by Horace T. Pentecost in the 1940s. [1] The original Hoppi-Copter consisted of two contra-rotating rotors on a pole attached to a motorized backpack. [2] Although it was capable of flight, it was extremely hard to control. [3]
The Boeing-Sikorsky team is seen to have an advantage with their large industrial base that may result in wider support from Congress. Their transport helicopters are the most-used in the Army currently. [12] Up to 2013, Sikorsky and partners have spent $250 million on X2 and Raider. [6] The team and aircraft will be separate from the S-97 ...
Tandem-rotor helicopters, however, use counter-rotating rotors, with each cancelling out the other's torque. Therefore, all of the power from the engines can be used for lift, whereas a single-rotor helicopter uses some of the engine power to counter the torque. [1] An alternative is to mount two rotors in a coaxial configuration.
The helicopter was developed for ferrying and anti-submarine warfare. Design work began in 1969 and the first prototype flew in 1973. Design work began in 1969 and the first prototype flew in 1973. It was intended to replace the decade-old Kamov Ka-25 , and had to have identical or smaller external dimensions than its predecessor.
Civilian flying crane helicopter with a gondola under the lengthened nose for controlling slung loads up to 2,000 kilograms (4,400 lb). Fitted with electrically de-iced rotor blades and optional seats for 12 passengers. A single prototype (SSSR-21110) flown in 1966. Ka-25PS