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Net tonnage of C-25?

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Luuv2sail
Deckhand

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USA
3 Posts

Initially Posted - 01/13/2011 : 12:52:02

Does anyone know the net displacement tonnage of a C-25? I was wondering whether the C-25 was heavy enough to qualify for USCG documentation. The minimum displacement requirement is 5 net tons (displacement vs weight).
Thanks!

Edited by - on

Stinkpotter
Master Marine Consultant

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Djibouti
9075 Posts

Response Posted - 01/13/2011 : 14:11:15

Hi Brian... "Net Tonnage" is an estimation of the cargo carrying capacity of a vessel, based on its hull length, beam, depth (deck to bottom of the inside of the hull), and "shape" (using one of several arbitrary factors)--not the vessel's weight (displacement). It's all in [url="http://www.westlawn.edu/SimplifiedTonnageGuideUSCG.pdf"]here[/url]. Gross tonnage and net tonnage are the same for an outboard-powered boat (power or sail).

When I waded through the exercise once, I think my C-25 came up just short of five tons, but I'll let somebody else do the wading. (My current boat calculates to 7 net tons.)

As for the stated five ton minimum, I know of people who have been required to document their boats for insurance purposes (??) whose boats seemed similarly short of the minimum by my rough estimate...

Edited by - Stinkpotter on 01/13/2011 14:33:37

Renzo
Admiral

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USA
621 Posts

Response Posted - 01/13/2011 : 16:18:35

Don't know about the qualifications for documentation but acording to Archimedes: "any floating object displaces it's own weight" So the displacement of water for a C-25 would be equal to the weight on the manufacturers specification sheet which in the case of a C-25 FK would be 4,500lbs.

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Stinkpotter
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Djibouti
9075 Posts

Response Posted - 01/13/2011 : 17:58:57

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Renzo
 ...which in the case of a C-25 FK would be 4,500lbs.<hr height="1" noshade id="quote"></blockquote id="quote">True, but that has nothing to do with the definition of Gross Tonnage and Net Tonnage for a vessel as it relates to documentation and license requirements for commercial use. The Net Tonnage for a C-25, by my rough calculation, was 4.xx, which is then truncated to 4 tons. (This is not to say it weighs or displaces 8,000-10,000 lbs.) Now I would have to rely on my unreliable memory--particularly having to do with depth from deck to bilge, and the dimensions of the cabin trunk (average length, width, and height). Have at it.

Edited by - Stinkpotter on 01/13/2011 18:08:31

Stinkpotter
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Djibouti
9075 Posts

Response Posted - 01/13/2011 : 18:05:00

Incidentally, regarding one of the boats I thought didn't qualify for documentation, going back through the calculation (with some estimates), it did. So that explains why the owner was able to have it documented. (My "two cents worth" might be worth a penny.)

Edited by - Stinkpotter on 01/13/2011 18:07:24

Dave5041
Former Mainsheet Editor

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USA
3758 Posts

Response Posted - 01/13/2011 : 21:22:56

Tonnage is the entire enclosed volume in cubic feet divided by 100: one ton (traditionally tonne) is 100 cu.ft of enclosed volume. The calculation standards vary by country, but they have enough fudge that you can probably qualify a C-25. You are still required to pay annual registration fees in many states for use on non-federal waters.

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Nautiduck
Master Marine Consultant

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USA
3704 Posts

Response Posted - 01/15/2011 : 19:06:49

Why would you want to qualify for USCG documentation?

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Dave5041
Former Mainsheet Editor

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USA
3758 Posts

Response Posted - 01/16/2011 : 08:02:30

Exactly, since you will still probably pay state fees.

Edited by - on

Stinkpotter
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Djibouti
9075 Posts

Response Posted - 01/16/2011 : 09:31:59

Yup, most (maybe not all) states require that you also register with them and pay whatever taxes (such as sales)... But in most states you don't have to put state numbers on the hull--just the name and hail-port per the documentation. Your USCG documentation number must be permanently affixed to a prominent place below so it can't be removed without causing damage.

Edited by - Stinkpotter on 01/16/2011 09:43:05

captainstuart
Deckhand

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USA
6 Posts

Response Posted - 01/17/2011 : 15:15:23

Typically tonnage is overall length (L), by overall breadth (B), by depth (D)
(not draft, rather internal depth from keel to inside cabin top)

It is a meassurment of "total volume"

different for sail and power boats

For Sail (L x B x D ÷ 100) x .50
For Power (L x B x D ÷ 100) x .67

Actual USCG document on this (see page 5 - 8)

http://www.qualitymaritime.info/Press/Guide_Tonnage_Simplified_0.pdf

Edited by - on

Dave5041
Former Mainsheet Editor

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USA
3758 Posts

Response Posted - 01/17/2011 : 19:26:43

With a C-25 a hair over the line, you can pay your money, scrape those pesky numbers off your bows, and expect to be stopped by the marine enforcement officers every time you go out so you can show them your documentation and explain that that supersedes state registration numbers.

Edited by - on

NCBrew
Captain

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USA
338 Posts

Response Posted - 01/18/2011 : 06:38:27

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Dave5041
 With a C-25 a hair over the line, you can pay your money, scrape those pesky numbers off your bows, and expect to be stopped by the marine enforcement officers every time you go out so you can show them your documentation and explain that that supersedes state registration numbers.

<hr height="1" noshade id="quote"></blockquote id="quote">

On my 34' Sailboat I got stopped once. We normally have the same officers in my area (Albemarle Sound) If you travel you will be stopped again but it always gave me great pleasure knowing they could not come aboard. (Of course the USCG can)

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Dave5041
Former Mainsheet Editor

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USA
3758 Posts

Response Posted - 01/18/2011 : 19:13:04

I suspect that a smaller, trailerable boat is more likely to be challenged for not displaying state numbers. Even if they can't come aboard without permission, you still have to stop and produce papers. Whether or not they can board is less of an issue to me than the inconvenience of the challenge. To each his own

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Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 01/19/2011 : 09:29:07

There are a few reasons to document a vessel: Commercially used, if your travelling abroad frequently (in the boat), you intend to buy it with a preferred ship mortgage, Your state has a sales tax exemption for documented vessels , your state does not issue boat titles or just to say that you did.

Not boarding by the local LEO's isn't a benefit in my book. By the time everything is sorted out, your day is shot...or in the case of the larger bodies of water, they will just call in USCG anyway.

Edited by - on

redviking
Master Marine Consultant

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USA
1771 Posts

Response Posted - 01/19/2011 : 11:32:10

I have seen many a Pacific Seacraft Dana 24 and the like who have been documented - size doesn't really matter.

LEO's are not allowed to board you if you are documented. Call the Coasties who will back you up. This used to be a big deal back when Florida had local authorities mandating anchor time limits, etc...

When you call the Coasties simply state your vessel name and your USCG documentation number and they instantly know who you are. Coasties don't care about state databases. This also means anyone else can find out who owns your boat and what your mailing address is etc... http://www.st.nmfs.noaa.gov/st1/CoastGuard/VesselByName.html

sten

Edited by - on

Dave5041
Former Mainsheet Editor

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USA
3758 Posts

Response Posted - 01/19/2011 : 18:07:17

My comment was just that the LEOs in most states are not used to seeing smaller boats without registry numbers and will be more likely to challenge you. I can can certainly see the issue with Florida before the state stepped in with superseding laws to get the locals under control and standardized.

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