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Old 01-21-2012, 07:38 PM   #1
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Gross

I'm curious as to the gross tonnage (not displacement), of the different vessels that folks*on TF own.*Have you calculated your GT, or did that info come with your boat? *KJ*********************
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Old 01-21-2012, 07:51 PM   #2
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RE: Gross

Quote:
KJ wrote:
I'm curious as to the gross tonnage (not displacement), of the different vessels that folks*on TF own.*Have you calculated your GT, or did that info come with your boat? *KJ*********************
*El Capitan, are you asking for the actual weight of the vessel or the admeasure for documentation purposes?
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Old 01-21-2012, 08:27 PM   #3
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Gross

35' w/l x 13.4' max beam x 4' max draft, hard chine semi-displacement

Documented: 19 gross tons, 15 net tons

Displacement:* 26000 lbs 50% wet


-- Edited by Jay N on Saturday 21st of January 2012 09:29:05 PM
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Old 01-21-2012, 08:48 PM   #4
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RE: Gross

According to our documentation, our 1973 fiberglass GB36 is 18 gross tons, 15 net tons. Our weight in the Travelift slings is 28,000 pounds which I assume is our displacement.
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Old 01-21-2012, 08:53 PM   #5
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Gross

Quote:
Moonstruck wrote:KJ wrote:
I'm curious as to the gross tonnage (not displacement), of the different vessels that folks*on TF own.*Have you calculated your GT, or did that info come with your boat? *KJ*********************
*El Capitan, are you asking for the actual weight of the vessel or the admeasure for documentation purposes?

*
The GT that I am asking about is calculated on "the moulded volume of all enclosed spaces of the ship".* The reason I'm asking is that my insurance co. wants to know the Gross Tonnage of my boat. They made it quite clear that they were not asking for the displacement or dead weight. Yes, I will need it for documentation also.*

*
I think they use a ship's GT to determine manning requirements or something like that. I was just wondering if someone had a similar design, they might know their vessels GT.* It might save me some research.**

*
I was going to send the equation to Stephen Hawkins.* ******KJ

*


-- Edited by KJ on Saturday 21st of January 2012 09:54:42 PM
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Old 01-21-2012, 09:14 PM   #6
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Gross

The Coot has a gross tonnage (a measure of volume, not weight) of 15 for USCG documentation purposes.* The builder provided the three dimensions (length - 35.8', hull depth - 5.2'*and hull width - 12.3') on the documentation application I submitted to the USCG.* The USCG calculated the tonnage based on those dimensions.* The USCG-calculated tonnage does not measure the boat's actual volume.

This explains it: https://homeport.uscg.mil/cgi-bin/st...67ed4582205fa9

The USCG uses the simplified method to measure tonnage.* I'm unaware of the use of the formal method for small boats*(under 79 feet in length)*such as ours for any purpose.


-- Edited by markpierce on Saturday 21st of January 2012 11:10:02 PM
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Old 01-21-2012, 09:26 PM   #7
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RE: Gross

Gross tons are usually a determination made by the boat's designer.

If you can't find a documented sistership that has one, you may need to talk with a naval architech.
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Old 01-22-2012, 12:49 AM   #8
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Gross

Quote:
KJ wrote:*Yes, I will need it for documentation also.*
We did not have to supply the tonnage information when we had our boat documented after we bought it.* However.... the boat had been documented by the previous owners--- our documentation number is the same as theirs had been--- so the USCG obviously had the data on record.

If your boat has been documented by a previous owner (unless you're the original owner) it may be that the data for your boat is already on record.

And is it possible that production boats like Grand Banks, etc. have "standard" tonnage figures for each model that the USCG already has on record or can get if they want it?


-- Edited by Marin on Sunday 22nd of January 2012 01:50:23 AM
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Old 01-22-2012, 07:28 AM   #9
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RE: Gross

The USCG has just about all designs on file if more than a few have been documented in the past. Call the National Vessel Documentation Center and they can tell you.* I think you can also get the simplified calculation form from their website and download it.* It's very easy to do...harder to accurately measure your boat.* I used to get those forms when I had to teach the 200Ton masters course.

Your insurance company is suspect if they need it from you.

Was your vessel previously documented and/orsurveyed?* Strange the surveyor didn't list it.* Of course*they usually just copy it from your documentation paperwork

*
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Old 01-22-2012, 08:12 AM   #10
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RE: Gross

My 2003 Monk 36's*documentation*certificate reads: 21 GRT, 16 NRT.

For the first time I'm noticing the*measurements on the Cert. of Documentation read** Lenght 36, Breadth 13,* Depth 6.7.

I am not sure what they mean by "depth" the draft is 4', is "depth" a different measurement than "Draft"?

Except for a name change I have only had the doc's that were with the boat

*renewed so the original information was supplied by a previous owner.

Anybody know?

Steve W
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Old 01-22-2012, 08:18 AM   #11
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RE: Gross

Thanks.* All good info.* I found a really cool website that had the data; "BoatInfoWorld.com".

KJ
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Old 01-22-2012, 08:19 AM   #12
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RE: Gross

Quote:
psneeld wrote:
*

Your insurance company is suspect if they need it from you.

*

*
*Why would that be?
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Old 01-22-2012, 08:33 AM   #13
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RE: Gross

Quote:
Steve wrote:
My 2003 Monk 36's*documentation*certificate reads: 21 GRT, 16 NRT.

For the first time I'm noticing the*measurements on the Cert. of Documentation read** Lenght 36, Breadth 13,* Depth 6.7.

I am not sure what they mean by "depth" the draft is 4', is "depth" a different measurement than "Draft"?

Except for a name change I have only had the doc's that were with the boat

*renewed so the original information was supplied by a previous owner.

Anybody know?

Steve W
*Basically those measurements are to determine how much coal or cargo you can carry. Interior volume.
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Old 01-22-2012, 08:35 AM   #14
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RE: Gross

Quote:
KJ wrote:psneeld wrote:
*

Your insurance company is suspect if they need it from you.

*

*
*Why would that be?

*Because they should either have it on file or be able to find it in a second.

I'm on my 3rd documented boat and the insurance companies have never asked for it.* Either they don't care... or my cut is they really don't have a clue about boats...even the big marine ones (yes they brokers do but not the underwriters)...until you get into the ones that insure lots of commercial vessels or SHIPS woth hundreds of millions.
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Old 01-22-2012, 08:38 AM   #15
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RE: Gross

Look here for answers..

*

http://www.uscg.mil/hq/msc/docs/CG-5397.pdf
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Old 01-22-2012, 10:18 AM   #16
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RE: Gross

It's apparent that many recent posters*have not read the document I linked earlier on the simplified calculation of tonnage.
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Old 01-22-2012, 10:36 AM   #17
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RE: Gross

Thanks guys, I got the data.
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Old 01-22-2012, 09:58 PM   #18
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RE: Gross

Our 47' is 30 tons gross, 24 tons net
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Old 01-22-2012, 10:28 PM   #19
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RE: Gross

OK, here's how I look at it. My holding tank is 25 gallons, times 8#/gallon = 200#, = .090909 GROSS tons.

Beyond that, I really don't care.
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Old 01-22-2012, 10:42 PM   #20
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RE: Gross

I couldnt agree more, Carey. That's all that matters...lol!
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