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Old 03-27-2016, 02:24 PM   #1
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Beam to Waterline Ratio

Since most folks on TF appreciate spending time aboard their boats and recognize how important space (interior and exterior) is, I thought it would be interesting to see if we can identify the trawler (under 75') with largest beam to waterline or beam to LOA ratio.

If nothing else, this fun little exercise may help someone tweak his/his next boat search when looking for a live aboard.

John T.
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Old 03-27-2016, 02:42 PM   #2
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Obviously, that would be a Catamaran, probably something like a Africat 42 with a beam of 22' or so, Lagoon 43 with nearly the same, and PDQ 34 with a 16 ft. beam. If you mean Mono-hulls, it would likely be the Great Harbor GH or N-37 with 15' 10" I think. The Manatee 36 is pretty fat with 13'8". There must be other fat ladies out there. Interesting question though.
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Old 03-27-2016, 03:00 PM   #3
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Largest? I think these NS boats win....roughly 50' x 27'.

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Old 03-27-2016, 03:17 PM   #4
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Beam Size

[QUOTE=Tad Roberts;427834]Largest? I think these NS boats win....roughly 50' x 27'.

Wow, these are something else. Who is the builder and where are they built? I would be curious to understand how they handle and under different sea conditions and how efficient they are to operate. Thanks

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Old 03-27-2016, 03:39 PM   #5
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John T,
A wide beam to length ratio will automatically give low efficiency. Frequently fish boats are wide for carring capacity. But sometimes they are short and wide to accomodate max length rules or laws.

The American Tugs are much wider than the Nordic Tugs. Also much taller w presumably much more space inside. I'm moored right next to where they are built so see a lot of them. In years past I didn't like them because they threw big wakes and seemed very inefficient but now I like them. If I could afford one and the fuel I could see myself buying one. I like the style even if a little chubby .. especially the FB. The FB is steeply sloped in front.
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Old 03-27-2016, 03:44 PM   #6
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[QUOTE=Tad Roberts;427834]Largest? I think these NS boats win....roughly 50' x 27'.

Holy smokes....it's hard to believe that anything would touch that ratio. Live-aboard conversion anyone?
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Old 03-27-2016, 03:50 PM   #7
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Beam

[QUOTE=manyboats;427845]John T,
A wide beam to length ratio will automatically give low efficiency. Frequently fish boats are wide for carring capacity. But sometimes they are short and wide to accomodate max length rules or laws.

I totally agree on the efficiency factor and when I think of designers aiming for the "most" efficient mono hull design I think of Set Sail in Australia with there "cross an ocean quickly aluminum narrow hulls". I also recognize the FD hulls can go a little wider than SD without hurting performance. It is a bit of a balancing act and interesting to see how different designers manage expectations.

It will be interesting to see what everyone comes up with for both recreational FD and SD hull ratios.

John
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Old 03-27-2016, 03:53 PM   #8
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Lots of different builders in Nova Scotia and New Brunswick. These are called "Cape Island" style boats. Commonly 40' x 22' or 45-46' x 25'. Saw one at 50' x 30'.

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Old 03-27-2016, 04:42 PM   #9
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My boat I am told gets one mile/gallon at 13 knots. It's 65' long by 22' wide.
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Old 03-27-2016, 05:04 PM   #10
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I went the other way. 38x11.5.
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Old 03-27-2016, 05:40 PM   #11
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My boat qualifies as a "fat boy. 35'8" by 13': 2.6 to 1.

Edit: waterline length is 31'3", making for a 2.4 to 1 ratio.
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Old 03-27-2016, 07:01 PM   #12
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My current boat (anyone want to buy it?) has a beam/LWL ratio of 0.37, fatter than even your Coot. Very fat for a sailboat. Pretty efficient though.

The boat I have an offer on has a beam/LWL ratio of 0.33, so a bit skinnier.
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Old 03-27-2016, 07:27 PM   #13
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Dave, using a beam to lwl ratio, the Coot is 0.4.
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Old 03-27-2016, 08:20 PM   #14
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does this waterline make my stern look fat?

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Old 03-27-2016, 09:07 PM   #15
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108'6" beam. Designed to fit through the Panama canal with a 110 ft limit. Happened to spend a few years of my relative youth on a sister ship.

Nothing like the ride storming through heavy seas or bombing up the SoCal coast at 25Kt's plus....
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Old 03-27-2016, 10:57 PM   #16
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The beam/LWL ratio is about 0.33 on our GB 42.
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Old 03-27-2016, 11:13 PM   #17
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Quote:
Originally Posted by what_barnacles View Post
does this waterline make my stern look fat?
The Iowa has a beam to length ratio of about 0.12: a Slim Jim.
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Old 03-27-2016, 11:20 PM   #18
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Forgot to add this photo of Iowa while she was in our backyard near San Francisco. She is on the lower right (obviously!). Length to beam is very "fast"!

The structure on the upper left is the covered dry dock which was used by the US Navy and CIA to covertly salvage the Soviet Union's submarine (K-129) northwest of Hawaii in 1974 (sunk in 1968). Today the structure is used by a local ship yard near San Francisco (Bay Ship and Yacht). The dry dock was originally built by Howard Hughes for marine mining operations.
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Old 03-27-2016, 11:26 PM   #19
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Wasn't "mining" the cover story, like the GSF Explorer which recovered part of the submarine?:

https://en.wikipedia.org/wiki/GSF_Explorer

Recall seeing the Explorer when passing near the reserve fleet in the 1980s.
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Old 03-27-2016, 11:47 PM   #20
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Beam to LWL on the Defever 44 is about .38
38.5' LWL, 14.75' beam
Pretty chubby.

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