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the chassis of a rotary-wing UAV materials are duralumin or carbon fiber. The material should also be suitable for its anticipated operating environment to avoid issues such as heat stress cycling induced from sunlight or brittle fracture in cold environments. the propellers rotate horizontally and generate thrust orthogonally to the direction of the rotation. Functional parameters of a propeller include blade diameter, blade pitch, and blade number.

the propeller thrust also depends on several operational variables, including air density, wind speed, and propeller speed. In contrast to helicopters, which have a cyclical pitch, UAVs have fixed-pitch propellers. In this case, the lift can be increased only by increasing the propeller speed. Increased propeller pitch results in increased drag.

in regard to design parameters, propellers should have the minimum weight that achieves sufficient strength to withstand the stress forces at maximum thrust.Without balance, unexpected yaw can occur, leading the vehicle to rotate without any input from the pilot.the naming convention of provides a convenient shorthand for describing these configurations and is often used. UAV has evenly distributed rotors in a circle around the central unit. The number after the configuration type refers to the total number of rotor blades present.

UAVs have rotor blades enclosed in casings built into the chassis. This configuration permits flights in tighter and more challenging environments and thus reduces the risk of damaging the UAV or its surroundings. many commercial UAVs have foldable propellers to facilitate transport. this coupling results in highly nonlinear dynamics, which are further complicated by the inclusion of additional aerodynamic effects, another complication is the absence of a braking mechanism for UAVs, except for the friction of air resistance.

the UAV must provide its own braking mechanism through control of propeller speeds in order to dampen movements and provide stability. the use of multiple propellers in UAVs allows the rotor blades of each propeller to have a small diameter, minimizing stresses on the transverse arms. the overall kinetic energy is distributed across the rotors. The reduced kinetic energy of each rotor can decrease damage should one of rotors collide with an object. For small UAVs, this design is safer for close interactions and increases flight stability in local turbulent eddies.

a higher number of blades, a larger pitch, or a greater diameter correspond to increased thrust and hence power. Propellers of two rotor blades generate more thrust than propellers of three or more blades, which lose a greater fraction of power to turbulence. In respect to larger blade pitch or diameter, the motor must correspondingly produce greater torque. these craft derive their lift from propellers, which are fans that generate thrust through the rotation of rotor blades on a rotor mast. most rotary-wing UAVs require multiple rotors to manage the stresses upon the rotor blades necessary to become airborne.