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Intermeshing rotored helicopters have high stability and powerful lifting capability. The latest Kaman K-MAX model is a dedicated sky-crane design used for construction work, and has been modified for trials by the USMC as an optionally-unmanned cargo transporter. Unmanned aerial vehicles with intermeshing rotors have also been flown. [2]
The dissymmetry of lift of one rotor disc is cancelled by the dissymmetry of lift of the other rotor disc. [citation needed] Tandem rotor helicopters such as the CH-47 Chinook still suffer from dissymmetry of lift, because the rotors are offset from one another. Tandem-rotor helicopters are installed with automatic cyclic feathering systems.
A manned multirotor helicopter that was flying in the 2010s had 18 electrically powered rotors; the single seat aircraft is powered by batteries. [36] The first aerobatic manned drone, as this type of electrically powered multi-rotor helicopter is known, had 12 rotors and could carry 1-2 people. [37]
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]
As there is a low rotor clearance at the aircraft front, it is approached from the rear when the rotors are turning. Due to the limitations of the Ka-26, USSR and Romania agreed under the Comecon trade to build a single-turboshaft engine version, the Kamov Ka-126 , with better aerodynamics and range.
Unlike a helicopter, autogyros and rotor kites do not have an engine powering their rotors, but while an autogyro has an engine providing forward thrust that keeps the rotor turning, a rotor kite has no engine at all, and relies on either being carried aloft and dropped from another aircraft, or by being towed into the air behind a car or boat.
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 S-72 in flight without a main rotor in 1984. Sikorsky and Bell Helicopters competed for the RSRA contract. [1] Bell's preferred proposal was the "Bell 646A" with rotors based on the Bell 240 UTTAS; the alternative was the smaller "Bell 646B" based on the Bell 309 KingCobra. [2]
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