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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.
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]
Tandem rotors are two rotors—one mounted behind the other. Coaxial rotors are two rotors mounted one above the other on the same axis. Intermeshing rotors are two rotors mounted close to each other at a sufficient angle to let the rotors intermesh over the top of the aircraft. Another configuration—found on tiltrotors and some early ...
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 Fl 282 Kolibri was an improved version of the Flettner Fl 265 announced in July 1940, which pioneered the same intermeshing rotor configuration that the Kolibri used. It had a 7.7 litre displacement, seven-cylinder Siemens-Halske Sh 14 radial engine of 110–120 kW (150–160 hp) mounted in the center of the fuselage, with a transmission mounted on the front of the engine from which a ...
The two rotors were synchronised through a shaft to prevent blade collision, allowing the aircraft to operate through only one engine in the event of an emergency. In that case, the remaining engine would automatically run up to double power to compensate. [4] Bristol attempted to market a civilian variant of the helicopter, designated the Type ...
The Mk 1 and Mk 2 prototypes were fitted with two 9-cylinder Alvis Leonides 73 engines, each rated at 550hp (410 kW) [6] The company received a contract for three evaluation helicopters from the Ministry of Supply , these improved Type 173 Mk 3 had four-bladed rotors, a taller aft pylon for improved efficiency in gusty air, stronger airframes ...