Controllable-pitch propellers allow for adjustment of blade pitch during operation, enabling efficient operation over a wide range of vessel speeds and loads.

A Kort nozzle is a duct surrounding the propeller that helps increase propeller efficiency by reducing energy losses and improving thrust.

V-type engines are often preferred in large marine vessels due to their compact design, which allows for more efficient use of engine room space.

The gearbox in a marine propulsion system transmits power from the engine to the propeller, allowing for optimal engine operation and propeller efficiency.

Propeller cavitation occurs when the pressure around the propeller blades drops below the vapor pressure of the water, causing the formation of vapor bubbles that can reduce propeller efficiency.

Propeller design is a critical factor in determining the efficiency of a marine propulsion system, as it directly affects the amount of thrust generated and the energy losses associated with the propeller.

The stern tube in a marine propulsion system serves multiple purposes, including supporting the propeller shaft, protecting it from corrosion, and providing lubrication to reduce friction.

Fixed-pitch propellers are often used in low-speed, high-torque applications due to their simplicity, reliability, and cost-effectiveness.

The propeller boss cap in a marine propulsion system helps improve propeller efficiency by reducing energy losses and optimizing the flow of water around the propeller.

In-line engines are often preferred in small marine vessels due to their compact design and ease of maintenance.

Propeller slip is the difference between the actual propeller speed and the theoretical propeller speed, which is determined based on the vessel's speed and the propeller's pitch.

Operating conditions, such as sea state, weather conditions, and vessel loading, have a relatively smaller impact on the overall efficiency of a marine propulsion system compared to factors like propeller design and engine type.

The propeller hub in a marine propulsion system serves multiple purposes, including connecting the propeller blades to the propeller shaft, providing structural support to the propeller blades, and reducing propeller noise.

Variable-pitch propellers are often used for high-power applications as they allow for adjustment of blade pitch during operation, enabling efficient operation over a wide range of vessel speeds and loads.