A conventional RC helicopter has its main rotor above the fuselage (its body) which consists of 2 or more rotor blades extending out from a central rotor head, or hub assembly.
The main rotor of an RC helicopter is what produces the lifting forc that allows the RC helicopter to fly. The rotors on a collective pitch RC helicopter are shaped just like the airfoils of an airplane wing, only they are thinner, narrower and both sides are symmetrical.
Depending on how the RC helicopter is set up, the main rotors typically spin at a constant headspeed ranging anywhere from 1,500 RPM to 3,000RPM. Larger size .60 or .90 RC helicopters will usually have a headspeed of 1,500RPM to 2,000RPM where smaller .30 or .50 size helis might have a headspeed in the 2,000RPM to 3,000RPM range
As the rotor blades rotate through the air, they generate lift. The amount of lift generated is determined by the pitch angle (and speed) of each rotor blade as it moves through the air. Pitch angle is referred to as the angle of attack when the rotors are in motion.
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