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A rotor is a finely tuned rotating mass, and different subtle adjustments reduce vibrations at different airspeeds. [2] The rotors are designed to operate at a fixed RPM [3] [4] [5] (within a narrow range of a few percent), [6] [7] but a few experimental aircraft used variable speed rotors. [8]
The CH-47B was an interim upgrade while Boeing worked on a more substantially improved CH-47C. The CH-47B was powered by two Lycoming T55-L-7C 2,850 hp (2,130 kW) engines. It had a blunted rear rotor pylon, redesigned asymmetrical rotor blades, and strakes along the rear ramp and fuselage to improve flying characteristics.
The rotor head incorporates elastomeric bearings for hub springs, and flapping and pitch change bearings. The system is similar in design to that used by the AH-1 Cobra. Rotor speed at 100% engine speed is 348 RPM. All series models incorporate a pusher-type two-bladed tail rotor mounted on the left side of the tailboom, turning at 3396 RPM.
The rotor system, or more simply rotor, is the rotating part of a helicopter that generates lift. A rotor system may be mounted horizontally, as main rotors are, providing lift vertically, or it may be mounted vertically, such as a tail rotor, to provide horizontal thrust to counteract torque from the main rotors.
The V-22 has a maximum rotor downwash speed of over 80 knots (92 mph; 150 km/h), more than the 64-knot (74 mph; 119 km/h) lower limit of a hurricane. [ 121 ] [ 122 ] The rotorwash usually prevents the starboard door's usage in hover; the rear ramp is used for rappelling and hoisting instead.
The Rotor is an amusement ride designed and patented by German engineer Ernst Hoffmeister in 1948. The ride was first demonstrated at Oktoberfest 1949 and still appears in numerous amusement parks. The Rotor is a large, upright barrel, rotated to create an inward acting centripetal force supplied by the wall's support's force.