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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] Manned drones or eVTOL as they are called typically multirotor designs powered by batteries gained increasing popularity and designs in the 2020s. [38]
An intermeshing-rotor helicopter (or synchropter) is a helicopter with a set of two main rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding.
The transmission is a system of gears, bearings, clutches and shafts that performs several functions (1) Translates the alignment of the drive shaft to match the alignment of the rotor shafts; (2) Reduces the RPM of the drive shaft to the lower RPMs of the rotors; and (3) Enables the engine to engage or disengage from the rotors. For ...
Translational lift is improved rotor efficiency resulting from directional flight in a helicopter.Translation is the conversion from the hover to forward flight. [1]: 2–27 As undisturbed air enters the rotor system horizontally, turbulence and vortices created by hovering flight are left behind and the flow of air becomes more horizontal.
Raising the nose leads to more airflow through the rotor and raising the collective converts this airflow into more rotor lift which will slow the helicopter's forward speed. Raising the collective also keeps the rotor RPM from exceeding redline. Depending on the helicopter, before airspeed has completely decayed, the helicopter is leveled.
American Eurocopter – founded as Vought Helicopter Inc, now a wholly owned subsidiary of Eurocopter; American Helicopter [10] Aviodyne U.S.A. Bell/Agusta Aerospace Company; Bell Helicopter [44] Bendix Helicopter Company (defunct) [10] Bensen Aircraft Company (defunct) [10] Boeing Rotorcraft Systems (formerly Boeing Helicopters & Boeing-Vertol ...
Ducted fan tail rotors have also been used in the Russian Kamov Ka-60 medium-lift helicopter, [17] and also on the Japanese military's Kawasaki OH-1 Ninja reconnaissance rotorcraft. French light helicopter manufacturer Hélicoptères Guimbal has also used a Fenestron for their Guimbal Cabri G2, a compact reciprocating engine-powered rotorcraft ...
The 'Flettner double rotor' (Sheetintermeshing rotor) is a propulsion system for helicopter, the two rotors used their axes in a low angle tilted against each other. The first helicopter, which this after its developer Anton Flettner notified principle used was in only 6 copies built Flettner Fl 265, the captain of flight Richard Perlia May ...