Helicopter Design refers to the process and methodology involved in creating and developing helicopters, which are rotary-wing aircraft capable of vertical takeoff and landing. This encompasses the planning and engineering of various components, including the rotor system, fuselage, propulsion system, avionics, and control mechanisms. Key considerations in helicopter design involve aerodynamics, structural integrity, weight distribution, performance efficiency, and safety. Designers must also account for the intended use of the helicopter, whether for military, commercial, medical, or recreational purposes, which influences the specific features and capabilities required. The goal of helicopter design is to optimize the aircraft for performance, reliability, and user requirements, while adhering to regulatory standards and advancements in technology.