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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]
The tail rotor is powered by the helicopter's main power plant, and rotates at a speed proportional to that of the main rotor. In both piston and turbine powered helicopters, the main rotor and the tail rotor are mechanically connected through a freewheeling clutch system , which allows the rotors to keep turning in the event of an engine ...
Revolution Helicopter Corporation (defunct) – went out of business in November 1999; Robinson Helicopter [18] RotorWay International – produces kit helicopters [28] Sikorsky Aircraft [56] Schweizer Aircraft – acquired by Sikorsky Aircraft in 2004 and closed down in 2011 and 2012 [57] Spitfire Helicopter Company [26]
However, the rear rotor works in the aerodynamic shadow of the front rotor, which reduces its efficiency. This loss can be minimized by increasing the distance between the two rotor hubs, and by elevating one hub over the other. [4] [5] Tandem-rotor helicopters tend to have a lower disk loading than single-rotor helicopters. [6]
The company was renamed Hiller Helicopters in 1948. It was involved in the development of a number of prototype helicopters. It was involved in the development of a number of prototype helicopters. From the early 1960s to 1969, its Palo Alto plant served as a CIA cover for the production of the CORONA reconnaissance satellites .
Vibration in the framework then coupled with a helicopter phenomenon known as ground resonance. [3] The vibration was sufficient to cause a structural failure as the starboard rear helicopter broke off its mounting, its rotors cutting into the gasbag. [3] The unbalanced lift then made the vibrations worse and the remaining three helicopters ...
NOTAR ("no tail rotor") is a helicopter system which avoids the use of a tail rotor. It was developed by McDonnell Douglas Helicopter Systems (through their acquisition of Hughes Helicopters ). The system uses a fan inside the tail boom to build a high volume of low-pressure air, which exits through two slots and creates a boundary layer flow ...
Two companies were involved in the research and proposing designs: Bell Helicopter and Boeing Vertol. The focus was on tilt-rotor pods, integration of the tilting rotors with the wings and fuselage of the aircraft, and studying the airflow as the rotors tilted. Tilt rotors with fixed rotors and with folding rotors were investigated.
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