propellerët

Propellerët, also known as propellers, are rotating airfoils used to provide thrust for aircraft and watercraft. They consist of two or more blades attached to a central hub, which is connected to a power source, typically an engine. When the blades rotate, they create a pressure difference that generates thrust, propelling the vehicle forward.

Propellers are classified based on their blade configuration and the direction of rotation. Fixed-pitch propellers have blades with a constant angle of attack, while variable-pitch propellers can adjust their blade angle to optimize performance at different speeds. Propellers can also be classified as right-hand or left-hand, depending on the direction of rotation when viewed from the front.

In aircraft, propellers are used in conjunction with an engine to provide thrust for takeoff and cruising. They are also used in helicopters for vertical lift and forward thrust. In watercraft, propellers are used to provide thrust for propulsion and steering. They are commonly found in boats, ships, and submarines.

Propellers are designed to be efficient and reliable, with considerations for factors such as blade shape, material, and balance. They are also designed to minimize noise, vibration, and cavitation, which can occur when the propeller operates in water. Advances in propeller design and materials have led to improvements in performance, efficiency, and environmental impact.