Rotor blades are the components of a rotor system which create lift and thrust for an aircraft, helicopter, wind turbine, or similar device by rotating around a central axis. In helicopters, the rotor blades are generally referred to as "main rotor blades" and "tail rotor blades".
In engineering terms, a rotor blade can be defined as an aerofoil (a surface curved in such a way as to give lift to an aircraft in motion) which rotates around an axis. The aerodynamic profile of a rotor blade is similar to that of a fixed wing aircraft wing, with a curved upper surface and a flat or slightly concave lower surface.
Rotor blades are typically constructed of composite materials, such as fiberglass, carbon fiber, or a combination of both. These materials are lightweight, strong, and durable, and can withstand the high stresses and vibrations associated with rotorcraft operations.
The design and construction of rotor blades is a critical aspect of aircraft and rotorcraft performance and safety. Factors such as blade shape, size, weight, and material properties must be carefully considered to ensure optimal performance and efficiency.
