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The propeller is at the end of a shaft. The shaft passes through a fitting called a stuffing box. The stuffing box contains a material like cotton or waxed twine that wraps around the shaft. There are two or more bolts that hold the stuffing box together and by tightening or loosening the bolts you can squeeze or release the stuffing material to the shaft. Ideally you tighten the bolts to the point that water just drips in.
This allows the shaft to spin freely. It is lubricated by the water. If you tighten the box too much then you can score the shaft.
The water that drips in is usually pumped out by a bilge pump.
What else can I help you with?
Why do speed boats have pointed hulls?
In order to slice through the water with ease.
What are examples of displacement hulls?
Some examples of displacement hulls include sailboats, traditional fishing boats, and some types of canoes and kayaks. These hulls are designed to displace water and move through it efficiently at low to moderate speeds, making them suitable for leisurely cruising or fishing.
Using Archimede's Principlecite an example that illustrates the apparent loss of weight?
In boats, ships, or sub's ballast tanks get too full the water separates into the hulls(the outer parts of boats) , i thinkkk. lol :D
Can you make metal float?
You can't make a bar of metal float on water, but boats with metal hulls float. Also, metal bars and other metal objects float on mercury.
How does a 1.3 billion pound boat float?
It must displace as much weight in water as it weighs (roughly 600 cubic meters of water). These boats have huge hulls, so can easily displace this much without beginning to sink.
How do submarines withstand deep sea pressure?
The simple explanation of the ability of a submarine to withstand deep sea pressure lies in the mechanical strength of the pressure hull. On modern military submarines (called boats by the crews) the pressure hull is make of steel (except in the case of a few Russian boats which used titanium). This steel basically forms a cylinder and keeps the pressure of the sea water at operating depth from crushing the hull. To gain a tactical advantage, the Russian Navy built some of their boats with titanium pressure hulls. These hulls were designed to allow greater operating depths, and, therefore, increased ability to "hide" beneath the sea. But as is the case with the steel hulls, the titanium hulls used the geometry (shape) and the mechanical strength of the pressure hull and all the fittings to keep the water out at test depth.
A boat with 3 hulls starting with tri?
A boat with three hulls is called a "trimaran." Trimaran boats are known for their stability and speed, thanks to their three-hull design, which allows them to glide efficiently over water. They are often used for both recreational sailing and racing, offering more deck space than traditional monohull boats. Their unique structure helps distribute weight evenly, enhancing performance and maneuverability.
What kind of holes to mow sailboats and large cruisers have?
Sailboats and large cruisers typically have several types of holes, including through-hulls for plumbing and drainage, as well as deck-mounted fittings for rigging and sails. The most common through-hulls are for the engine intake, sink drains, and bilge pumps. Additionally, they may have ports for navigation lights and other electronics. These holes must be properly sealed to prevent water ingress and maintain buoyancy.
Basic types of vessel hulls can be described as?
Basic types of vessel hulls can be described as displacement hulls, planing hulls, and semi-displacement hulls. Displacement hulls are designed to move through the water by displacing it, typically found in larger ships and sailboats. Planing hulls, common in smaller powerboats, rise and glide on top of the water at higher speeds, reducing drag. Semi-displacement hulls combine features of both, allowing for efficient travel at moderate speeds while maintaining stability.
Why would boats that go out to sea have deep hulls instead of flat bottoms like the river boat?
Boats that go out to sea typically have deep hulls to enhance stability and seaworthiness in rough ocean conditions. A deep hull allows for better handling of waves and reduces the risk of capsizing, as it provides a lower center of gravity. In contrast, flat-bottomed river boats are designed for shallow waters and ease of maneuverability, making them suitable for calm river conditions but less effective in the turbulent ocean. Deep hulls also enable ocean-going vessels to cut through water more efficiently, improving speed and fuel efficiency.
What type of boat is most likely to have a planing hull?
A ski boat. Any type can "plane out" going fast enough though a v-hull would be the most common fro fast boats. It is a factor of the size, length, and weight of the boat and the power of the motor. A 15 foot aluminum boat can plane out with a 15hp outboard.
What type of water conditions do deep hulls operate best in?
shallow water
