What is a Ton in Boat Weight

[boatpoker]

So the only important thing to remember from all of this is ...
If your cheque bounces I won't file your Tonnage Measurement

Sittin' here workin' on one right now.

[aqfishing]

Originally Posted by boatpoker

So the only important thing to remember from all of this is ...
If your cheque bounces I won't file your Tonnage Measurement

Sittin' here workin' on one right now.

🤣🤣🤣🤣🤣🤣

[garyfrankovich]

The documented tonnage has NOTYHIG to do with weight It is the cubic volume of the inside of your boat. The Gross tonnage is cubic volume of the entire inside area, the net tonnage subtracts the furniture, cabinetry etc., and that is theoretically the volume of cotton or grain that could be carried. One "ton" is actually 100cubin feet of space. In the USA this all derives form when merchant ships were carrying cotton bales. If you were using the British measurement (you'll see their tonnage numbers are less) because they used Tea chests which were larger than cotton bales. On your USCG document you'll find the length of your vessel is also short, because that measurement is the length from the foremost perpendicular frame to the aft most perpendicular frame, and did not include overhangs.

[GypsyOwner]

Wot about Megagrams then?

[boatpoker]

Originally Posted by garyfrankovich

The documented tonnage has NOTYHIG to do with weight It is the cubic volume of the inside of your boat. The Gross tonnage is cubic volume of the entire inside area, the net tonnage subtracts the furniture, cabinetry etc., and that is theoretically the volume of cotton or grain that could be carried. One "ton" is actually 100cubin feet of space. In the USA this all derives form when merchant ships were carrying cotton bales. If you were using the British measurement (you'll see their tonnage numbers are less) because they used Tea chests which were larger than cotton bales. On your USCG document you'll find the length of your vessel is also short, because that measurement is the length from the foremost perpendicular frame to the aft most perpendicular frame, and did not include overhangs.

Didn't ya read the other 77 posts where this has been explained 27 times ?

[John Williams]

Also keep in mind that a metric ton is spelt “tonne”. In most of the world, excluding the small part that is the USA, we can tell whether it is tons or tonnes by the spelling. Of course this is only a reference to weight. Not volume etc.

[aqfishing]

Originally Posted by garyfrankovich

The documented tonnage has NOTYHIG to do with weight It is the cubic volume of the inside of your boat. The Gross tonnage is cubic volume of the entire inside area, the net tonnage subtracts the furniture, cabinetry etc., and that is theoretically the volume of cotton or grain that could be carried. One "ton" is actually 100cubin feet of space. In the USA this all derives form when merchant ships were carrying cotton bales. If you were using the British measurement (you'll see their tonnage numbers are less) because they used Tea chests which were larger than cotton bales. On your USCG document you'll find the length of your vessel is also short, because that measurement is the length from the foremost perpendicular frame to the aft most perpendicular frame, and did not include overhangs.

Please explain how removing the volume of the furniture in the master and crew quarters will impact the amount of grain you can carry, unless of course you plan to fill these spaces with grain??? Maybe go back and actually read some of the posts.

Your understanding of registered length is also wrong…google it!!!


OH WAIT!!! I get it! That was an April fools joke…good one, you got me!!!

[El Pinguino]

Originally Posted by aqfishing

Please explain how removing the volume of the furniture in the master and crew quarters will impact the amount of grain you can carry, unless of course you plan to fill these spaces with grain??? Maybe go back and actually read some of the posts.

Your understanding of registered length is also wrong…google it!!!


OH WAIT!!! I get it! That was an April fools joke…good one, you got me!!!

Well, no. Poorly expressed maybe but not wrong.
Length 'between perpendiculars' is a thing.

'Ship dimensions, form, size, or category
D.J. Eyres M.Sc., F.R.I.N.A., G.J. Bruce M.B.A, F.R.I.N.A., MSNAME., in Ship Construction (Seventh Edition), 2012
The hull form of a ship may be defined by a number of dimensions and terms that are often referred to during and after building the vessel. An explanation of the principal terms is given below:
After Perpendicular (AP): A perpendicular drawn to the waterline at the point where the after side of the rudder post meets the summer load line. Where no rudder post is fitted it is taken as the center line of the rudder stock.
Forward Perpendicular (FP): A perpendicular drawn to the waterline at the point where the fore-side of the stem meets the summer load line.
Length Between Perpendiculars (LBP): The length between the forward and aft perpendiculars measured along the summer load line.
Amidships: A point midway between the after and forward perpendiculars.
Length Overall (LOA): Length of vessel taken over all extremities.
Lloyd’s Length: Used for obtaining scantlings if the vessel is classed with Lloyd’s Register. It is the same as length between perpendiculars except that it must not be less than 96% and need not be more than 97% of the extreme length on the summer load line. If the ship has an unusual stem or stern arrangement the length is given special consideration.
Register Length: The length of ship measured from the fore-side of the head of the stem to the aft side of the head of the stern post or, in the case of a ship not having a stern post, to the fore-side of the rudder stock. If the ship does not have a stern post or a rudder stock, the after terminal is taken to the aftermost part of the transom or stern of the ship. This length is the official length in the register of ships maintained by the flag state and appears on official documents relating to ownership and other matters concerning the business of the ship. Another important length measurement is what might be referred to as the IMO Length. This length is found in various international conventions such as the Load Line, Tonnage, SOLAS and MARPOL conventions, and determines the application of requirements of those conventions to a ship. It is defined as 96% of the total length on a waterline at 85% of the least molded depth measured from the top of keel, or the length from the fore-side of stem to the axis of rudder stock on that waterline, if that is greater. In ships designed with a rake of keel the waterline on which this length is measured is taken parallel to the design waterline.'

That is from here
https://www.sciencedirect.com/topics...-perpendicular

[aqfishing]

Originally Posted by El Pinguino

Well, no. Poorly expressed maybe but not wrong.
Length 'between perpendiculars' is a thing.

'Ship dimensions, form, size, or category
D.J. Eyres M.Sc., F.R.I.N.A., G.J. Bruce M.B.A, F.R.I.N.A., MSNAME., in Ship Construction (Seventh Edition), 2012
The hull form of a ship may be defined by a number of dimensions and terms that are often referred to during and after building the vessel. An explanation of the principal terms is given below:
After Perpendicular (AP): A perpendicular drawn to the waterline at the point where the after side of the rudder post meets the summer load line. Where no rudder post is fitted it is taken as the center line of the rudder stock.
Forward Perpendicular (FP): A perpendicular drawn to the waterline at the point where the fore-side of the stem meets the summer load line.
Length Between Perpendiculars (LBP): The length between the forward and aft perpendiculars measured along the summer load line.
Amidships: A point midway between the after and forward perpendiculars.
Length Overall (LOA): Length of vessel taken over all extremities.
Lloyd’s Length: Used for obtaining scantlings if the vessel is classed with Lloyd’s Register. It is the same as length between perpendiculars except that it must not be less than 96% and need not be more than 97% of the extreme length on the summer load line. If the ship has an unusual stem or stern arrangement the length is given special consideration.
Register Length: The length of ship measured from the fore-side of the head of the stem to the aft side of the head of the stern post or, in the case of a ship not having a stern post, to the fore-side of the rudder stock. If the ship does not have a stern post or a rudder stock, the after terminal is taken to the aftermost part of the transom or stern of the ship. This length is the official length in the register of ships maintained by the flag state and appears on official documents relating to ownership and other matters concerning the business of the ship. Another important length measurement is what might be referred to as the IMO Length. This length is found in various international conventions such as the Load Line, Tonnage, SOLAS and MARPOL conventions, and determines the application of requirements of those conventions to a ship. It is defined as 96% of the total length on a waterline at 85% of the least molded depth measured from the top of keel, or the length from the fore-side of stem to the axis of rudder stock on that waterline, if that is greater. In ships designed with a rake of keel the waterline on which this length is measured is taken parallel to the design waterline.'

That is from here
https://www.sciencedirect.com/topics...-perpendicular

He says “ On your USCG document you'll find the length of your vessel is also short, because that measurement is the length from the foremost perpendicular frame to the aft most perpendicular frame, and did not include overhangs.”

That is not correct. Even if you ignore his reference to frames. It is just plain wrong. Length between perpendiculars is not your registered length as he states.

Yes length between perpendiculars is a thing, but it is NOT your registered length. Maybe re read your quoted text.

Also to assist read:

https://www.dco.uscg.mil/Portals/9/D...%20Systems.pdf

To quote the USCG document:

“ Registered Length means either 1) 96 percent of the length from the fore side of the stem to the aftermost side of the stern on a waterline at 85 percent of the least molded depth measured from the top of the flat plate keel; or 2) the length from the fore side of the stem to the axis of the rudder stock on that waterline, whichever is greater.”

As is also stated in your quoted text.

Cheers!

[mhorwitz]

Originally Posted by toerail

Thanks I just downloaded the USCG simplified calculation method and got 29.5 gross tons
My documentation isnt correct
And it cost me 600.00 by a professional
And they put 13 gross and 12 net
I dont know what they did
And I dont need these for ais or mmsi number is another thing I was looking at

You essentially gave away $500 if it was an initial registration. The process is really very simple and can be completed by most people who have the wherewithal to own a sailing vessel. Note that renewal costs are around $25.00. Do that yourself. So-called professionals will add $100-125 to that for nothing more than re-entering the information you provide to them to the USCG website. Just sayin..

[Montanan]

Originally Posted by Adelie

For the purposes of calculating “Tonnage” a ton is 100 cubic feet.

I believe this goes back to tuns of wine.

Tuns of wine, especially are tons of fun!!! Heck, a single tun is more than enough to have some fun onboard for the duration of a voyage.

The tun (Old English: tunne, Latin: tunellus, Middle Latin: tunna) is an English unit of liquid volume (not weight), used for measuring wine, oil or honey. Typically a large vat or vessel, most often holding 252 wine gallons, but occasionally other sizes (e.g. 256, 240 and 208 gallons) were also used.

As to metres/meters, I forget just how many teaspoons are in one???

The metre (Commonwealth spelling) or meter (American spelling) (from the French unit mètre, from the Greek noun μέτρον, "measure", and cognate with Sanskrit mita , meaning "measured") is the base unit of length in the International System of Units (S I). The SI unit symbol is m.

As to the image below revealing how to properly fill a wine glass: This is rather hard to successfully accomplish when your boat rocks, but is worthy of the attempt.

[boatpoker]

How many horses are going to be beaten to death on this thread ?
there is a lot of real practical information and a lot of BS here.
Good luck sorting it out

[Dieseldude]

Originally Posted by boatpoker

How many horses are going to be beaten to death on this thread ?
there is a lot of real practical information and a lot of BS here.
Good luck sorting it out

Maybe a few tonnes of horses. But really, a basic understanding of tonnage is at some time required to own and operate a vessel. You have registry, various fees, and other legal and financial matters that involve tonnage. Then there are the practical matters of haul out and perhaps transporting by truck or large vessel from time to time. Even if one forgets details due to lack of use, it would be handy to have definitions and specifications saved for occasional use. Commercial vessels keep basic specifications on a printed list on the bridge. These are needed for making pilot arrangements, and the list is called the "pilot card". The pilot needs to know the spec's of the vessel to know what he is dealing with.

[boatpoker]

Originally Posted by Dieseldude

Maybe a few tonnes of horses. But really, a basic understanding of tonnage is at some time required to own and operate a vessel. You have registry, various fees, and other legal and financial matters that involve tonnage. Then there are the practical matters of haul out and perhaps transporting by truck or large vessel from time to time. Even if one forgets details due to lack of use, it would be handy to have definitions and specifications saved for occasional use. Commercial vessels keep basic specifications on a printed list on the bridge. These are needed for making pilot arrangements, and the list is called the "pilot card". The pilot needs to know the spec's of the vessel to know what he is dealing with.

Are you a commercial vessel ? Haulout and transport by truck are irrelevant to Tonnage measurement.
As an IMO recognized Tonnage Measurer if find this entire thread amusing

[OneBoatman]

So in order to simply this. Let's say you are trolling along, and someone asks "what's the tonnage rating of your boat?" Lucky for you, you read this forum and you've just learned that for purposes beyond anything you ever expected 100 cubic ft of cargo space is defined as 1 Ton. No problem, break out your calculus book just to brush up a bit. It says the first integral of area is volume. If you are in the US you put your units in ft and now that integration is right in your wheelhouse, all you need to do is calculate the available volume in cubic feet defined by whatever space in your boat someone might consider is available for carrying cargo and then divide it by 100. Then take that same number and put it on the application you submit when documenting your vessel so that when your certificate arrives you have it to show anyone that asks.