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07-13-2020, 01:15 PM
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#1
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Newbie
City: Hannibal
Country: USA
Join Date: Jul 2020
Posts: 3
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Tonnage on Mainship 390
Recently purchased a 390 Mainship 2003. Working on Coast Guard Documentation. Can someone advise what their certificate states for gross tonnage and net tonnage? An old form showed 22 GRT and 18 NRT. Is this correct? Thank you so much.
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07-13-2020, 02:09 PM
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#2
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Guru
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 5,404
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Use the numbers on the old document. USCG tonnage has little to do with real weight.
David
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07-13-2020, 04:37 PM
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#3
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Newbie
City: Louisiana
Country: United States
Vessel Name: Jolly Mon
Vessel Model: Mainship 350/390
Join Date: Jan 2017
Posts: 4
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29T Gross, 27T Net on my documentation for a '99
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07-13-2020, 05:32 PM
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#4
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Guru
City: Hughesville, MD
Country: USA
Vessel Name: Branwen
Vessel Model: Hatteras 48 LRC
Join Date: Feb 2015
Posts: 582
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Welcome to the forum. Hope you'll post some pics of your new ride.
Greg.
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07-13-2020, 05:43 PM
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#5
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Guru
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 8,434
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Welcome aboard. Net tons is equal to 100 cubic feet of cargo carrying capacity. It has nothing to do with actual weight. Net tonnage is volume minus the machinery spaces basically. The tonnage quoted in the replies seems a bit on the high side. A previous boat I had was a 46’ and I think that it was 22 net tons. I would imagine that yours would be in the neighborhood of 18 net tons give or take. If you have line drawings of the boat you can calculate it fairly closely. But having said that, just use what it was listed previously. The different tonnage really makes no difference unless the boat is less than 5 net, then it cannot be documented.
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07-13-2020, 06:28 PM
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#6
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Guru
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 5,404
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It really doesn't matter what the real tonnage is or what some other MS 390 owner says it is. You will have trouble if you don't use what was on the previous document.
David
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07-13-2020, 07:00 PM
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#7
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Guru
City: Philadelphia
Country: USA
Vessel Name: Dreamers Holiday
Vessel Model: Mainship 390
Join Date: Jun 2010
Posts: 509
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My 2003 390 says gross tonnage 22.
as others have said, use whatever was on the original documentation. If you change anything but the ownership and the name of the boat you're opening yourself up for a paperwork nightmare. Those were the words used by the broker during the purchase.
John
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07-13-2020, 08:15 PM
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#8
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Guru
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 8,434
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Quote:
Originally Posted by johnma
My 2003 390 says gross tonnage 22.
as others have said, use whatever was on the original documentation. If you change anything but the ownership and the name of the boat you're opening yourself up for a paperwork nightmare. Those were the words used by the broker during the purchase.
John
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I could believe gross of 22, but not net. Not that it really matters...
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Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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07-14-2020, 11:52 AM
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#9
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Veteran Member
City: Redondo Beach, CA
Vessel Name: Mainia
Vessel Model: Mainship 390
Join Date: Oct 2011
Posts: 34
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This question reminded me of a tonnage discussion in 2004 on another forum. I can't vouch for any accuracy, but for those interested:
TWL: Vessel Documentation
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Jamie Millar,
Mainia, '02 Mainship 390
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07-20-2020, 09:04 AM
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#10
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Senior Member
City: Kingston Ontario
Country: Canada
Vessel Name: Cartouche
Vessel Model: Mainship 390
Join Date: Dec 2017
Posts: 154
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Quote:
Originally Posted by marke627
Recently purchased a 390 Mainship 2003. Working on Coast Guard Documentation. Can someone advise what their certificate states for gross tonnage and net tonnage? An old form showed 22 GRT and 18 NRT. Is this correct? Thank you so much.
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Up here in Canada on our 2003 Gross Tonnage 12.50 Net Registered Tonnage 6.41 Canadian Certificate of registry
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Joanne & Edward Billing
M/V Cartouche Mainship 390
Kingston 1000 Islands
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07-20-2020, 01:25 PM
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#11
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TF Site Team
City: Westerly, RI
Country: USA
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 2,391
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Quote:
Originally Posted by Comodave
I could believe gross of 22, but not net. Not that it really matters...
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Tonnage is cargo carrying capacity. Gross is measured form the hull, Net is measured from the volume of the cargo spaces. Even with Gross Tonnage, In no way is Mainship 390 hull volume capable of carrying 44,000 lbs.
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07-20-2020, 03:17 PM
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#12
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Guru
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 8,434
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Quote:
Originally Posted by Shrew
Tonnage is cargo carrying capacity. Gross is measured form the hull, Net is measured from the volume of the cargo spaces. Even with Gross Tonnage, In no way is Mainship 390 hull volume capable of carrying 44,000 lbs.
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For admeasurment, tonnage is not a weight measurement but rather a volume measurement. Back in the colonial days, I guess, a ton of cargo took up 100 cubic feet or so. So tonnage became known as 100 cubic feet. It is still used to admeasure a boat for documentation purposed. Gross tonnage is the total volume of the boat including engine spaces and any other non cargo carrying spaces. Net tonnage would be the gross tonnage minus the engine and non cargo spaces in volume, not weight. Tonnage has absolutely nothing to do with weight. So the 44,000 pounds has nothing to do with tonnage. Sounds strange, doesn’t it?
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07-21-2020, 12:05 PM
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#13
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TF Site Team
City: Westerly, RI
Country: USA
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 2,391
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Length: 39' 9"
Beam: 14' 4"
Draft: 3' 8"
(40 x 15 x 4) = 2,400
For a boat with a simple sailing hull, gross tonnage (GT) = (.5 * L * B * D) / 100
--> (.5 x 2,400)/100 = 12
For a sailing boat with keel, GT = (.375 * L * B * D) / 100
--> (.75 x 2,400)/12 = 9
For freighters with angled or cylindrical hulls, GT = (.67 * L * B * D) / 100
--> (.67 x 2,400)/100 = 16.08
I'd guess more likely 10-11 Tons.
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