Speed and fuel economy: Efficient propellers can reduce energy loss, increase speed, and reduce fuel consumption. For example, ducted propellers improve blade load distribution through circular ducts, increasing efficiency by 10% -15% under heavy load conditions.

Handling stability: Multi blade propellers (such as five blades) can reduce vibration and noise, improve navigation stability, and are suitable for the stealth requirements of military submarines.

Underwater noise level: Propeller cavitation (local pressure drop causing bubble rupture during high-speed rotation) is the main source of noise. Low noise design (such as pump jet propulsion) can reduce sonar detection risks and enhance submarine survivability.

Economy: Efficient propellers can reduce the cost of ocean transportation. For example, after optimizing the propellers of a certain type of merchant ship, the annual fuel consumption is reduced by 5%, which is equivalent to saving millions of yuan.