Helicopter Flight
Posted on June 24th, 2008 | by Altamira |
Helicopter Flight
Around 1919, Henry Berliner built a counter-rotating coaxial rotor machine that made brief uncontrolled hops to a height of about four feet (1.2 meters) while steadied from the ground. In 1922, he mounted two coaxial counter-rotating rotors on the wing tips of a Nieuport biplane fuselage. Sets of movable vanesflat surfaces mounted under the rotorsprovided some control. The craft reportedly could maneuver in all directions and obtained a speed of about 40 miles per hour (64 kilometers per hour). In June 1922, it hovered around 12 feet (3.3 meters) off the ground and was successfully demonstrated to the U.S. Army in 1924. The Berliner aircraft are considered the first rudimentary piloted rc helicopter simulation developed in the United States.
During the late 1910s and early 1920s, Louis Brennan of England’s Royal Aircraft Establishment worked on a rc helicopter games with an exceptionally large two-bladed rotor. To deal with the problem of torque, Brennan used a single rotor and mounted propellers on the blades themselves. The use of servo-flaps or ailerons inboard of the propellers achieved control. He took several low-altitude flights, which ended in October 1925, when the machine crashed.
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