Multirotor
Encyclopedia
A multirotor or multicopter is a rotorcraft
with more than two rotors
. Multirotors often use fixed-pitch blades, whose rotor pitch does not vary as the blades rotate; 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 as amateur model aircraft projects.
Rotorcraft
A rotorcraft or rotary wing aircraft is a heavier-than-air flying machine that uses lift generated by wings, called rotor blades, that revolve around a mast. Several rotor blades mounted to a single mast are referred to as a rotor. The International Civil Aviation Organization defines a rotorcraft...
with more than two rotors
Helicopter rotor
A helicopter main rotor or rotor system is a type of fan that is used to generate both the aerodynamic lift force that supports the weight of the helicopter, and thrust which counteracts aerodynamic drag in forward flight...
. Multirotors often use fixed-pitch blades, whose rotor pitch does not vary as the blades rotate; 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 as amateur model aircraft projects.
Multi-rotor craft
- Cierva Air HorseCierva Air Horse-References:NotesReferences* Copies of entries in "The Complete Encyclopedia of World Aircraft", 1997. by D.Donald and "Helicopters and Autogyros of the World", 1958 by P.Lambermont. Hosted at www.aviastar.org. Accessed January 2008...
- a British three rotor helicopter, three rotors were used to give a large lift without compromising rotor strength. - QuadrotorQuadrotorA quadrotor, also called a quadrotor helicopter or quadrocopter, is an aircraft that is lifted and propelled by four rotors. Quadrotors are classified as rotorcraft, as opposed to fixed-wing aircraft, because their lift is derived from four rotors...
s - Etienne OehmichenEtienne OehmichenÉtienne Oehmichen was a French engineer and helicopter designer....
and George de BothezatGeorge de BothezatGeorge de Bothezat was a Russian American engineer, businessman and pioneer of helicopter flight.-Biography:George Bothezat was born in a family of Bessarabian landlords in 1882. After graduating school in Iași and attending the University of Iaşi he enrolled at the Mechanical Department of...
built and flew quadrotor designs in the 1920s.