Difference between left-handed and right-handed screw propellers

The main difference between left-handed and right-handed propellers lies in the direction of rotation: **Right-handed propeller (common)** – when viewed from the stern toward the bow, it rotates clockwise. - As it moves forward, the water flow is pushed backward, generating a forward thrust. - Most single-propeller vessels use right-hand rotation. **Left propeller** – viewed from the stern toward the bow: rotates counterclockwise. - The thrust direction is opposite to right rotation, but the forward effect is the same. **Practical application differences: **1.** **Dual-propeller vessels**: Typically use one propeller on the left and another on the right to counteract lateral torque and improve stability. 2. **Maneuverability**: The direction of rotation affects the ship’s yaw tendency, and it needs to be adjusted in conjunction with the rudder’s effectiveness. 3. **Matched power**: It must be compatible with the host’s steering system to avoid efficiency losses. In short, the main difference lies in the direction of rotation, which is actually determined based on the ship’s design and power configuration. .