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Quadcopters
A quadcopter, also called quadrocopter, or quadrotor is a type of helicopter or multicopter that has four Helicopter rotor, rotors. Although quadrotor helicopters and convertiplanes have long been flown experimentally, the configuration remained a curiosity until the arrival of the modern unmanned aerial vehicle or drone. The small size and low inertia of drones allows use of a particularly simple flight control system, which has greatly increased the practicality of the small quadrotor in this application. Design principles Each rotor produces both lift (force), lift and torque about its center of rotation, as well as drag force, drag opposite to the vehicle's direction of flight. Quadcopters generally have two rotors spinning clockwise (CW) and two counterclockwise (CCW). Flight control is provided by independent variation of the speed and hence lift and torque of each rotor. Pitch and roll are controlled by varying the net centre of thrust, with yaw controlled by varying t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aircraft Principal Axes
An aircraft in flight is free to rotate in three dimensions: '' yaw'', nose left or right about an axis running up and down; ''pitch'', nose up or down about an axis running from wing to wing; and ''roll'', rotation about an axis running from nose to tail. The axes are alternatively designated as ''vertical'', ''lateral'' (or ''transverse''), and ''longitudinal'' respectively. These axes move with the vehicle and rotate relative to the Earth along with the craft. These definitions were analogously applied to spacecraft when the first crewed spacecraft were designed in the late 1950s. These rotations are produced by torques (or moments) about the principal axes. On an aircraft, these are intentionally produced by means of moving control surfaces, which vary the distribution of the net aerodynamic force about the vehicle's center of gravity. Elevators (moving flaps on the horizontal tail) produce pitch, a rudder on the vertical tail produces yaw, and ailerons (flaps on the wings t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Bothezat Helicopter
The de Bothezat helicopter, also known as the Jerome-de Bothezat Flying Octopus, was an experimental quadrotor helicopter built for the United States Army Air Service by George de Bothezat in the early 1920s, and was said at the time to be the first successful helicopter. Although its four massive six-bladed rotors allowed the craft to fly successfully, it suffered from complexity, control difficulties, and high pilot workload, and was reportedly only capable of forward flight in a favorable wind. The Army canceled the program in 1924, and the aircraft was scrapped. Development and testing Self-described as "the world's greatest scientist and outstanding mathematician",Young 1982, p. 36. and having written one of the first scientific papers on the aerodynamics of rotary-wing flight, George de Bothezat was a refugee from the Russian Empire who had fled to the United States in the wake of the Russian Revolution. Having written and lectured extensively on rotorcraft theory, d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George De Bothezat
George de Bothezat (, ; 7 June 1882 – 1 February 1940) was a Romanian-Russian American engineer, businessman, and pioneer of helicopter flight. Biography George de Bothezat was born in 1882 in Saint Petersburg, Russian Empire, to Alexander Botezat and Nadine Rabutowskaja.Gheorghe Botezatu at The National Library of Moldova His father Alexander Il'ich Botezat belonged to a family of n landlords, graduated from the department of history and philology of the Saint Petersburg University and worked in the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Louis Breguet
Louis Charles Breguet (; 2 January 1880 in Paris – 4 May 1955 in Saint-Germain-en-Laye) was a French aircraft designer and builder, one of the early aviation pioneers. Biography Louis Charles Breguet was the grandson of Louis Clément François Breguet, and great-great-grandson of the famous horologist Abraham-Louis Breguet. In 1902 Louis married Nelly Girardet, the daughter of painter Eugène Girardet. They had seven children together; five survived infancy. In 1903, he graduated from École supérieure d'électricité, which was the top electrical engineering school in France. In 1905, with his brother Jacques, and under the guidance of Charles Richet, he began work on a gyroplane (the forerunner of the helicopter) with flexible wings. On 29 September 1907, at his workshop at La Brayelle, it achieved the first ascent of a vertical-flight aircraft with a pilot, albeit only to a height of . It was also not a free flight, as four men were used to steady the structur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aerodyne (aeronautics)
An aircraft ( aircraft) is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or the dynamic lift of an airfoil, or, in a few cases, direct downward thrust from its engines. Common examples of aircraft include airplanes, rotorcraft (including helicopters), airships (including blimps), gliders, paramotors, and hot air balloons. Part 1 (Definitions and Abbreviations) of Subchapter A of Chapter I of Title 14 of the U. S. Code of Federal Regulations states that aircraft "means a device that is used or intended to be used for flight in the air." The human activity that surrounds aircraft is called ''aviation''. The science of aviation, including designing and building aircraft, is called ''aeronautics.'' Crewed aircraft are flown by an onboard pilot, whereas unmanned aerial vehicles may be remotely controlled or self-controlled by onboard computers. Aircraft may be classified by different criteria, suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luke Maximo Bell
Luke Bell (born 1994) is a filmmaker, drone pilot and videographer from Cape Town, South Africa. Life and career Luke studied Mechatronic Engineering at the University of Cape Town where he began his career. In 2017 Luke was among the winners of the annual Dronestagram drone photography competition. In 2020 he was awarded first place in the music video category in the Moment Invitational Film Festival presented in New York City. In 2020 Luke became a Sony α ambassador for Middle East and Africa. During the COVID-19 pandemic, Luke received clearance to film the empty streets of Cape Town by drone. In more recent years he has worked as a drone pilot and drone camera operator on films like ''Resident Evil (TV series) ''Resident Evil'' is an Action television, action Horror fiction, horror television series developed by Andrew Dabb for Netflix. Loosely based on the video game series Resident Evil, of the same name by Capcom, it is the second television adap ...''' and ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coaxial Rotors
A coaxial-rotor aircraft is an aircraft whose helicopter rotor, rotors are mounted one above the other on Concentric objects, concentric shafts, with the same axis of rotation, but turning in opposite directions (contra-rotating). This rotor configuration is a feature of helicopters produced by the Russian Kamov helicopter design bureau. History The idea of coaxial rotors originates with Mikhail Lomonosov. He had developed a small helicopter model with coaxial rotors in July 1754 and demonstrated it to the Russian Academy of Sciences. In 1859, the British Patent Office awarded the first helicopter patent to Henry Bright for his coaxial design. From this point, coaxial helicopters developed into fully operational machines as we know them today. Two pioneering helicopters, the Corradino D'Ascanio#Between the wars, Corradino D'Ascanio-built "D'AT3" of 1930, and the generally more successful French mid-1930s ''Gyroplane Laboratoire'', both used coaxial rotor systems for flight. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multirotor
A multirotor or multicopter is a rotorcraft with more than two lift-generating rotors. An advantage of multirotor aircraft is the simpler rotor mechanics required for flight control. Unlike single- and double-rotor helicopters which use complex variable pitch rotors whose pitch varies as the blade rotates for flight stability and control, multirotors often use fixed- pitch blades; control of vehicle motion is achieved by varying the relative speed of each rotor to change the thrust and torque produced by each. Due to their ease of both construction and control, multirotor aircraft are frequently used in radio control aircraft and unmanned aerial vehicle (UAV) (drone) projects in which the names tricopter, quadcopter, hexacopter and octocopter are frequently used to refer to 3-, 4-, 6- and 8-rotor rotorcraft, respectively. There is also the X8 (also called ''octo-quad'') configuration that is similar to the quadracopter design, except that it has eight rotors; the lower of wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
