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A quadcopter, also called quadrocopter, or quadrotor [1] is a type of helicopter or multicopter that has four rotors. [ 2 ] 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.
Four rotors. Also referred to as the quadcopter or quadrotor. Usually two rotors turn clockwise and two counter-clockwise. More than four rotors. Referred to generally as multirotors, or sometimes individually as hexacopters and octocopter, these configurations typically have matched sets of rotors turning in opposite directions.
Elbit Systems Hermes-450 taking off Northrop Grumman Bat carrying EO/IR and SAR sensors, laser rangefinders, laser designators, infrared cameras A DJI Phantom quadcopter UAV for commercial and recreational aerial photography A General Atomics MQ-9 Reaper, a hunter-killer surveillance UAV Although most large military UAVs are fixed-wing aircraft, rotorcraft designs (i.e., RUAVs) such as this MQ ...
The Netra is a lightweight UAV, manufactured by carbon fiber composites, that uses quadcopters to provide lift and control giving a VTOL capability. It has no moving parts other than the rotors, motors and transmissions, and hence it requires very low maintenance.
Quadcopter ESCs usually can use a faster update rate compared to the standard 50 Hz signal used in most other RC applications. A variety of ESC protocols beyond PWM are utilized for modern-day multirotors, including, Oneshot42, Oneshot125, Multishot, and DShot.
Diagram of fully articulated main rotor head. Juan de la Cierva developed the fully articulating rotor for the autogyro. The basis of his design permitted successful helicopter development. In a fully articulated rotor system, each rotor blade is attached to the rotor hub through a series of hinges that let the blade move independently of the ...
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