A vessel's propeller works by thrusting a column of water away from the main body of the ship, thereby producing a reactive force that moves the boat forward. Most naval vessels use a screw-type propeller that transmits thrust through the main shaft to the thrust bearing. This reactive force reacts to the backward force of the water column to push the boat forward.Know More
Propeller blades rotate downward while water rushes in to fill the space left behind to create a pressure differential. Water accelerates from the front of the propeller towards the back, creating a column of water slightly bigger than the propeller itself. Higher velocity creates a water jet out of the rear of the propeller, which adds momentum and thrust to the water. This thrust moves the boat forward. Propeller blades work in water much like fan blades work in air.
The main thrust bearing is located at the forward end of the main shaft within the gear casing. A reduction gear connects to the main shaft which, in turn, connects to the propeller. Reduction gears reduce high rotational speeds of the engine so the propeller functions at lower rotational velocities. Gears allow the engine and propeller to work efficiently.Learn More
The maximum speed of a propeller occurs at its tip, and this speed is equal to the vector resulting from its forward speed and tangential velocity. This speed is the helical velocity at the propeller tip.Full Answer >
There are different decks of a ship, but the primary deck of the vessel is called the main deck. The main deck may be in different locations, depending on the type of ship. It is not usually the topmost deck.Full Answer >
A scull is a narrow, light racing boat for one, two or four people, with each passenger propelling the boat with a pair of oars. Eight person sculls are used in junior leagues or exhibitions.Full Answer >
The transom is the transverse, vertical section that makes up the rear, or stern of a boat directly opposite the bow. Transoms are flat or curved and are as high as the hull or low as the waterline. A vessel's name is commonly displayed on its transom.Full Answer >