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2. Skeg - Wikipedia

   en.wikipedia.org/wiki/Skeg

   The adjustment varies the degree to which the wind affects the boat – that is, the amount of lateral movement the wind can cause by impacting the upper parts of the boat and the crew. [2] [10] [11] In more conventional calculations, this would be the centre of effort of the sail area (CE). In still water, where the wind is pushing the boat ...

3. Outboard motor - Wikipedia

   en.wikipedia.org/wiki/Outboard_motor

   An outboard motor is a propulsion system for boats, consisting of a self-contained unit that includes engine, gearbox and propeller or jet drive, designed to be affixed to the outside of the transom. They are the most common motorised method of propelling small watercraft.

4. Ducted propeller - Wikipedia

   en.wikipedia.org/wiki/Ducted_propeller

   A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is ...

5. Marine thruster - Wikipedia

   en.wikipedia.org/wiki/Marine_thruster

   [clarification needed] The choice between using thrusters or traditional propellers to propel marine vessels is a compromise between versatility and efficiency. Propellers are designed to work in-line with a propulsion plant and produce one-directional thrust while thrusters are more customizable and have a more versatile application.

6. Propeller - Wikipedia

   en.wikipedia.org/wiki/Propeller

   A failed rubber bushing in an outboard's propeller. For smaller engines, such as outboards, where the propeller is exposed to the risk of collision with heavy objects, the propeller often includes a device that is designed to fail when overloaded; the device or the whole propeller is sacrificed so that the more expensive transmission and engine ...

7. Marine propulsion - Wikipedia

   en.wikipedia.org/wiki/Marine_propulsion

   Marine steam reciprocating engines, ca. 1905 A wind propelled fishing boat in Mozambique. Until the application of the coal-fired steam engine to ships in the early 19th century, oars or the wind were the principal means of watercraft propulsion.

8. 44-foot motor lifeboat - Wikipedia

   en.wikipedia.org/wiki/44-foot_motor_lifeboat

   The 44-foot motor lifeboat was the standard workhorse of the United States Coast Guard (USCG) rescue boat fleet. [1] The 44′ MLB has been replaced by the 47′ MLB. [2] The boats are powered by twin diesel engines, each powering a separate propeller. [3] 44 footer in 2006

9. Azimuth thruster - Wikipedia

   en.wikipedia.org/wiki/Azimuth_thruster

   There are two major variants, based on the location of the motor: [citation needed] Mechanical transmission, which connects a motor inside the ship to the outboard unit by gearing. The motor may be diesel or diesel-electric. Depending on the shaft arrangement, mechanical azimuth thrusters are divided into L-drive and Z-drive. An L-drive ...