Modern totally enclosed lifeboats are commonly fitted with ___ that also act as the required propeller guard and prevent fouling of the propeller by debris in the water.

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A Kort nozzle is a ducted propeller housing used on modern totally enclosed lifeboats. It surrounds the propeller with a cylindrical duct, which acts as a guard to protect the blades from debris and physical contact, and it channels water to the propeller to prevent fouling. This arrangement also boosts thrust and efficiency by accelerating the flow around the propeller, which is especially beneficial in the compact, enclosed propulsion setups used on lifeboats. The other options don’t provide this combination of protection and performance: a generic propeller guard ring lacks the ducted design that improves efficiency; a rudder cap protects the steering gear rather than the propeller; a debris shield is not the standard, integrated solution used to maintain propulsion performance.