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The Piasecki X-49 "SpeedHawk" is an American four-bladed, twin-engined experimental high-speed compound helicopter developed by Piasecki Aircraft.The X-49A is based on the airframe of a Sikorsky YSH-60F Seahawk, but utilizes Piasecki's proprietary vectored thrust ducted propeller (VTDP) design and includes the addition of lifting wings.
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 Sikorsky Raider X (stylized in all-caps as RAIDER X) (Sikorsky S-102 [1]) is a compound helicopter concept with two coaxial rotors and a single pusher propeller, designed by the Sikorsky Aircraft division of Lockheed Martin for the United States Army Future Attack Reconnaissance Aircraft (FARA) program. The Raider X concept was announced in ...
The Chinook is a heavy-lift helicopter that is among the heaviest lifting Western helicopters. Its name, Chinook, is from the Native American Chinook people of Oregon and Washington state. The Chinook was originally designed by Vertol, which had begun work in 1957 on a new tandem-rotor helicopter, designated as the Vertol Model 107 or V-107.
The hybrid design is simpler than a pure gasoline drivetrain by eliminating the gearboxes and rotor linkages of a traditional helicopter, while security is higher through two redundant motors. Each propeller blade is driven directly by an independent electric motor and flight control is achieved by varying the RPM of each blade to achieve ...
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It could also take some helicopter roles by fitting a 600 lb hoist to the ramp and a cabin configuration for 12 non-ambulatory patients and 5 seats for medical attendants. [205] Bell and P&W designed a frame for the V-22 to transport the Pratt & Whitney F135 engine of the F-35. [206] Two CMV-22Bs on the flight deck of USS Carl Vinson in 2023