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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 .
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.
Contra-rotating propellers Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races. Aircraft equipped with contra-rotating propellers (CRP) [1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra ...
Having a coaxial rotor with blades of polymer results in low inertia both relative to vertical and lateral axes, at 50%–75% as compared to a single rotor helicopter with tail rotor. No tail rotor also means it can perform flat turns at all speeds. A maximum vertical load of 3.5 g combined with low inertia makes the Ka-50 highly agile.
A wide track undercarriage has main wheels mounted on horizontal V-struts from the fuselage bottom and with a single bracing strut to the mid-fuselage on each side. [ 1 ] [ 2 ] The first flight was made on 21 May 1949 but tests showed that the G.11E was underpowered, so a decision was made to replace the Potez engine with a bigger nine-cylinder ...
In the summer of 2019, flights were suspended to address a bearing issue with the main rotor. Flight testing resumed on 24 September 2019. [19] The aircraft reached a speed of 211 knots during level flight in October 2020. [20] By December 2020, the demonstrator had logged 26 flight hours in 31 flights over the 21 months since first flight. [21]
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