Helicopter design refers to the comprehensive engineering process involved in creating and developing a helicopter, a type of rotorcraft that obtains lift and propulsion through one or more horizontally mounted rotors. This process encompasses various disciplines, including aerodynamics, structural engineering, materials science, and systems integration. Key elements of helicopter design include determining the size and shape of the airframe, rotor blade configuration, engine selection, and avionics systems. The design must consider factors such as stability, maneuverability, fuel efficiency, load capacity, and safety. Additionally, helicopter design involves compliance with regulatory standards and extensive testing to ensure performance and reliability in diverse operating conditions. The ultimate goal is to produce an effective aircraft that meets specific mission requirements while adhering to performance and safety regulations.