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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.
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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 Buckau, the first vehicle to be propelled by a Flettner rotor. A Flettner rotor is a smooth cylinder with disc end plates which is spun along its long axis and, as air passes at right angles across it, the Magnus effect causes an aerodynamic force to be generated in the direction perpendicular to both the long axis and the direction of airflow. [1]
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 B fitting adds 12 cm and the T height modifier 4 cm to the base hip measurement 89 + 16 = 105 cm. [13] Additionally there are a set of age based waist adjustments, such that a dress marketed at someone in their 60s may allow for a waist 9 cm larger than a dress, of the same size, marketed at someone in their 20s. The age based adjustments ...
For storage, the V-22's rotors fold in 90 seconds and its wing rotates to align, front-to-back, with the fuselage. [111] Because of the requirement for folding rotors, their 38-foot (12 m) diameter is 5 feet (1.5 m) less than would be optimal for an aircraft of this size to conduct vertical takeoff, resulting in high disk loading. [108]
The sizing systems also place size 0 (or 1) at different locations: Size 0 as a foot's length of 0. The shoe size is directly proportional to the length of the foot in the chosen unit of measurement. Sizes of children's, men's, and women's shoes, as well as sizes of different types of shoes, can be compared directly.