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Disadvantages of the tandem rotor system are a complex transmission [1] and the need for two large rotors. The two rotors are linked by a transmission that ensures the rotors are synchronized and do not hit each other, even during an engine failure. [2] Tandem-rotor designs achieve yaw by applying opposite left and right cyclic to each rotor ...
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.
It had an enclosed structure for one pilot and an 85 hp (63 kW) radial engine driving two rotors, each rotor fitted to a short boom on each side of the fuselage. It had a fixed tricycle landing gear. The H-2 first flew on 2 November 1944 and the company was awarded a development contract by the United States Army.
The two rotor masts are set at an angle of 25 degrees apart to allow the rotors to intermesh with each other. The masts transfer rotation from the transmission to the rotor blades. [3] The rotor blades (which turn in opposite directions [6] at 250—270 rpm) are built with a Sitka spruce wooden spar and Nomex fiberglass trailing edge sections. [3]
The twin intermeshed rotors of this design The prominent exhaust tube the turbine powered version HOK-1 with SS-11 (M22) missiles. The design had two main rotors, each with two blades, the blades were made primarily of wood and the two main rotors were linked by a transmission to keep them synced correctly. [8]
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 ...
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The XR-10 resembled a scaled-up XR-8, although its twin engines were carried in nacelles at the fuselage sides, driving the rotors via long driveshafts, and the aircraft was skinned entirely in metal. The first of two prototypes flew on 24 April 1947, and at the time, was the largest rotorcraft to fly in the United States. [2]