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What is loadline?

Updated: 9/20/2023
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LOADLIN is a bootloader for Linux that can boot a kernel from within MS-DOS. Basically you run LOADLIN as a DOS application, with the kernel as a command parameter.

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Kevin Greenfelder

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What is ship's reserve buoyancy?

We've just looked at buoyancy and how it is due to the water displaced by the underwater volume of a floating vessel. Refer back to Figure 9. The shaded section is the underwater volume of the hull. The unshaded part is known as reserve buoyancy, and can be simply described as the volume of the vessel above the waterline. Reserve buoyancy is important for the vessel's safe operation at sea. Think about the following example. You have set off for a day's fishing in a small fishing boat. You set off yourself with a small amount of gear from the moorings. Halfway down the harbour, you pick up a couple of mates, with their eskies of food and drink and a spare tank of fuel. The boat is lower in the water now and doesn't get up on the plane quite so easily. Nevertheless you head on out and have a good day's fishing, so good that the boat is filled with fish. On the way back in, you have to travel very slowly because the boat is very low in the water now and you are worried about seas being shipped over the side. What has happened is that you have reduced the reserve buoyancy of the boat. The more you load the boat, the greater is its displacement, the more it will sink in the water, the less reserve buoyancy it will have. Every boat must have sufficient reserve buoyancy to operate safely: do not overload your vessel. Commercial vessels have a load line assigned to them and it is an offence to proceed to sea with this loadline submerged. This line is sometimes know as the Plimsoll Line, after Samuel Plimsoll who campaigned heavily for the safe loading of ships in the 1870s. Reserve buoyancy, as we have seen in the example above, is linked pretty closely to the freeboard of the vessel, the height above the waterline of the uppermost continuous deck, or in a small boat, to the gunwale. Sufficient freeboard is required at all times to prevent the vessel being swamped and overwhelmed. For ocean going vessels, it is important to note that those structures above the waterline that are not watertight will not contribute to the reserve buoyancy of the vessel. Again, this makes sense - an open wheelhouse, or a cabin with the doors left open will not offer much protection if the vessel begins to ship water over the side. Another factor affecting the freeboard to take into account is the trim of the vessel. Trim is defined as the difference between the draft forward and the draft aft. Draft is the depth of the hull below the water. See Figure 13. If the aft draft is greater, the vessel is described as being trimmed by the stern, if the forward draft is greater, she is trimmed by the bow. See below. Note: Trimmed by the stern is called negative (-), trimmed by the bow positive (+). Every vessel has a designed seagoing trim where a baseline is drawn parallel to the designed summer load waterline. See below. On a merchant ship, the designed loaded sea going trim is even keel (drafts forward and aft are the same and the keel corresponds to the baseline). Smaller vessels are more likely to have rake in the keel (sloping from forward to aft) so that when floating at the designed sea going trim, the after draft will usually be greater than the forward draft. An excessive trim, caused by excess weight forward or aft, will reduce the freeboard forward or aft, change the vessels condition from the designed seagoing trim and may affect the seakeeping characteristics of the vessel. For commercial vessels, the stability book or the survey book will set out the maximum trim that the vessel is allowed to operate at.


What is reserve buoyancy?

We've just looked at buoyancy and how it is due to the water displaced by the underwater volume of a floating vessel. Refer back to Figure 9. The shaded section is the underwater volume of the hull. The unshaded part is known as reserve buoyancy, and can be simply described as the volume of the vessel above the waterline. Reserve buoyancy is important for the vessel's safe operation at sea. Think about the following example. You have set off for a day's fishing in a small fishing boat. You set off yourself with a small amount of gear from the moorings. Halfway down the harbour, you pick up a couple of mates, with their eskies of food and drink and a spare tank of fuel. The boat is lower in the water now and doesn't get up on the plane quite so easily. Nevertheless you head on out and have a good day's fishing, so good that the boat is filled with fish. On the way back in, you have to travel very slowly because the boat is very low in the water now and you are worried about seas being shipped over the side. What has happened is that you have reduced the reserve buoyancy of the boat. The more you load the boat, the greater is its displacement, the more it will sink in the water, the less reserve buoyancy it will have. Every boat must have sufficient reserve buoyancy to operate safely: do not overload your vessel. Commercial vessels have a load line assigned to them and it is an offence to proceed to sea with this loadline submerged. This line is sometimes know as the Plimsoll Line, after Samuel Plimsoll who campaigned heavily for the safe loading of ships in the 1870s. Reserve buoyancy, as we have seen in the example above, is linked pretty closely to the freeboard of the vessel, the height above the waterline of the uppermost continuous deck, or in a small boat, to the gunwale. Sufficient freeboard is required at all times to prevent the vessel being swamped and overwhelmed. For ocean going vessels, it is important to note that those structures above the waterline that are not watertight will not contribute to the reserve buoyancy of the vessel. Again, this makes sense - an open wheelhouse, or a cabin with the doors left open will not offer much protection if the vessel begins to ship water over the side. Another factor affecting the freeboard to take into account is the trim of the vessel. Trim is defined as the difference between the draft forward and the draft aft. Draft is the depth of the hull below the water. See Figure 13. If the aft draft is greater, the vessel is described as being trimmed by the stern, if the forward draft is greater, she is trimmed by the bow. See below. Note: Trimmed by the stern is called negative (-), trimmed by the bow positive (+). Every vessel has a designed seagoing trim where a baseline is drawn parallel to the designed summer load waterline. See below. On a merchant ship, the designed loaded sea going trim is even keel (drafts forward and aft are the same and the keel corresponds to the baseline). Smaller vessels are more likely to have rake in the keel (sloping from forward to aft) so that when floating at the designed sea going trim, the after draft will usually be greater than the forward draft. An excessive trim, caused by excess weight forward or aft, will reduce the freeboard forward or aft, change the vessels condition from the designed seagoing trim and may affect the seakeeping characteristics of the vessel. For commercial vessels, the stability book or the survey book will set out the maximum trim that the vessel is allowed to operate at.


Related questions

Loadline Scantling draft and design draft?

what is the correct meaning of wood scantling


What are the certificates requirements for tanker vessel for nk class?

Tanker vessel certificates are required as per the Flag state requirements which is as per the statutory certificate list,and complying solas,marpol and loadline,tonnage and class rules.


Why do you choose the Q point at the centre of the load line?

When operating point is chosen at the center of the load line, faithful reproduction of the amplified signal is obtained by allowing large voltage and current. So we choose q point at the center of the loadline.


Does temperature affect the boat to sink?

No. Allowance is made for the loadline between summer and winter. But this is due to bad weather being encountered more in the winter time, rather than the temperature. The density of water changes with temperature, but it is too small to be of any significance.


How do you choose q point on load line?

the fixed amount of current and voltages are developed across the transistor is called biasing. thus the fixed voltages and current developed are called Q-point


What is difference between AC and DC load line?

A dc load line is formed by joining the 2 points wherin the slope is equal to the inverse of the load resistance.. whereas the ac load lin has a different slope... and it intersects the dc load line at the quiescent point.


What is the difference between a fully loaded oil tanker floating and an empty oil tanker floating?

The main difference is weight of course. When fully loaded, the ships airdraft is considerably reduced, as you can definitely see the ship is more 'in the water', or more immersed. When not loaded, or 'In ballast', the ship has several ballast tanks which are filled up with sea water in order to weigh the ship down a little, so as for it to not capsize with strong winds/rogue waves. And a ship's hull/bulbous bow, etc.. are designed to operate/navigate within a certain Loadline, hence the need to keep the ship immersed within certain parameters.


What is ship's reserve buoyancy?

We've just looked at buoyancy and how it is due to the water displaced by the underwater volume of a floating vessel. Refer back to Figure 9. The shaded section is the underwater volume of the hull. The unshaded part is known as reserve buoyancy, and can be simply described as the volume of the vessel above the waterline. Reserve buoyancy is important for the vessel's safe operation at sea. Think about the following example. You have set off for a day's fishing in a small fishing boat. You set off yourself with a small amount of gear from the moorings. Halfway down the harbour, you pick up a couple of mates, with their eskies of food and drink and a spare tank of fuel. The boat is lower in the water now and doesn't get up on the plane quite so easily. Nevertheless you head on out and have a good day's fishing, so good that the boat is filled with fish. On the way back in, you have to travel very slowly because the boat is very low in the water now and you are worried about seas being shipped over the side. What has happened is that you have reduced the reserve buoyancy of the boat. The more you load the boat, the greater is its displacement, the more it will sink in the water, the less reserve buoyancy it will have. Every boat must have sufficient reserve buoyancy to operate safely: do not overload your vessel. Commercial vessels have a load line assigned to them and it is an offence to proceed to sea with this loadline submerged. This line is sometimes know as the Plimsoll Line, after Samuel Plimsoll who campaigned heavily for the safe loading of ships in the 1870s. Reserve buoyancy, as we have seen in the example above, is linked pretty closely to the freeboard of the vessel, the height above the waterline of the uppermost continuous deck, or in a small boat, to the gunwale. Sufficient freeboard is required at all times to prevent the vessel being swamped and overwhelmed. For ocean going vessels, it is important to note that those structures above the waterline that are not watertight will not contribute to the reserve buoyancy of the vessel. Again, this makes sense - an open wheelhouse, or a cabin with the doors left open will not offer much protection if the vessel begins to ship water over the side. Another factor affecting the freeboard to take into account is the trim of the vessel. Trim is defined as the difference between the draft forward and the draft aft. Draft is the depth of the hull below the water. See Figure 13. If the aft draft is greater, the vessel is described as being trimmed by the stern, if the forward draft is greater, she is trimmed by the bow. See below. Note: Trimmed by the stern is called negative (-), trimmed by the bow positive (+). Every vessel has a designed seagoing trim where a baseline is drawn parallel to the designed summer load waterline. See below. On a merchant ship, the designed loaded sea going trim is even keel (drafts forward and aft are the same and the keel corresponds to the baseline). Smaller vessels are more likely to have rake in the keel (sloping from forward to aft) so that when floating at the designed sea going trim, the after draft will usually be greater than the forward draft. An excessive trim, caused by excess weight forward or aft, will reduce the freeboard forward or aft, change the vessels condition from the designed seagoing trim and may affect the seakeeping characteristics of the vessel. For commercial vessels, the stability book or the survey book will set out the maximum trim that the vessel is allowed to operate at.


What is reserve buoyancy?

We've just looked at buoyancy and how it is due to the water displaced by the underwater volume of a floating vessel. Refer back to Figure 9. The shaded section is the underwater volume of the hull. The unshaded part is known as reserve buoyancy, and can be simply described as the volume of the vessel above the waterline. Reserve buoyancy is important for the vessel's safe operation at sea. Think about the following example. You have set off for a day's fishing in a small fishing boat. You set off yourself with a small amount of gear from the moorings. Halfway down the harbour, you pick up a couple of mates, with their eskies of food and drink and a spare tank of fuel. The boat is lower in the water now and doesn't get up on the plane quite so easily. Nevertheless you head on out and have a good day's fishing, so good that the boat is filled with fish. On the way back in, you have to travel very slowly because the boat is very low in the water now and you are worried about seas being shipped over the side. What has happened is that you have reduced the reserve buoyancy of the boat. The more you load the boat, the greater is its displacement, the more it will sink in the water, the less reserve buoyancy it will have. Every boat must have sufficient reserve buoyancy to operate safely: do not overload your vessel. Commercial vessels have a load line assigned to them and it is an offence to proceed to sea with this loadline submerged. This line is sometimes know as the Plimsoll Line, after Samuel Plimsoll who campaigned heavily for the safe loading of ships in the 1870s. Reserve buoyancy, as we have seen in the example above, is linked pretty closely to the freeboard of the vessel, the height above the waterline of the uppermost continuous deck, or in a small boat, to the gunwale. Sufficient freeboard is required at all times to prevent the vessel being swamped and overwhelmed. For ocean going vessels, it is important to note that those structures above the waterline that are not watertight will not contribute to the reserve buoyancy of the vessel. Again, this makes sense - an open wheelhouse, or a cabin with the doors left open will not offer much protection if the vessel begins to ship water over the side. Another factor affecting the freeboard to take into account is the trim of the vessel. Trim is defined as the difference between the draft forward and the draft aft. Draft is the depth of the hull below the water. See Figure 13. If the aft draft is greater, the vessel is described as being trimmed by the stern, if the forward draft is greater, she is trimmed by the bow. See below. Note: Trimmed by the stern is called negative (-), trimmed by the bow positive (+). Every vessel has a designed seagoing trim where a baseline is drawn parallel to the designed summer load waterline. See below. On a merchant ship, the designed loaded sea going trim is even keel (drafts forward and aft are the same and the keel corresponds to the baseline). Smaller vessels are more likely to have rake in the keel (sloping from forward to aft) so that when floating at the designed sea going trim, the after draft will usually be greater than the forward draft. An excessive trim, caused by excess weight forward or aft, will reduce the freeboard forward or aft, change the vessels condition from the designed seagoing trim and may affect the seakeeping characteristics of the vessel. For commercial vessels, the stability book or the survey book will set out the maximum trim that the vessel is allowed to operate at.