Talk:Waterline

message: This Article really helped me - Thankyou. Is it possible to put a Full defenition of the markings on a Plimsoll line, explaining the amount of Upthrust and buoyancy each type of water Provides? It would be even more useful then! Blondie448 15:56, 31 March 2007 (GMT)
:I believe that the types (densities) of water do not actually change actual buoyancy. From Buoyancy, "Thus the magnitude of the buoyant force is simply equal to the weight of the displaced fluid." Going from water densities 1.000 (fresh) to 1.025 (salt) and anywhere in between changes draft and volume of water displaced but the weight of the water displaced is the same as long as the weight of the vessel remains the same. The height of the center of buoyancy (KB) will change when using the formula of KB=.53*draft. But the sum of the buoyant forces on the hull will remain the same while the center of buoyancy and drafts change.KubalaC (talk) 02:40, 14 May 2008 (UTC)
thread_title:  Please add Full definition of the markings 

message: I don't think this line deserves its own page.  Perhaps a page describing the coordinate systems and slicing of a ship in order to come up with the lines drawing (no clue what the name of such an article might be), but the buttock line is really just a definition.
I took a couple semester of Naval architecture so I could write such an article, but I don't know what to call it.  It might even fit under a subsection of another page.  Suggestions?--Dj245 04:16, 3 December 2007 (UTC)
thread_title: buttock lines

message: I agree with the previous poster, there is a lack of information on the rationals behind the need for inventing the line, and why Mr Plimsoll was relevant. This has to be with the intentional overloading of vessels so to profit from the sinking. What started as a need to correct errors ended as a need to prevent a crimanal practice with the aim of profit. --79.168.11.181 (talk) 02:24, 7 December 2011 (UTC)
thread_title:  Missing 

message: Anybody know what classification society is CM?  We have a picture of a CM mark, but in our short list of societies later in the article, don't mention it.  It's not listed at Classification_society#List_of_classification_societies either.  -- RoySmith (talk) 01:24, 27 December 2011 (UTC)
replies: text: I started a new thread at Talk:Classification_society#Are there lists of Classification societies? asking about "CM" and more. --Marc Kupper|talk 00:57, 22 January 2013 (UTC)
thread_title:  CM? 

message: The last part of the article discusses passenger subdivisions P1, P2, P3, but the image below the text shows subdivisions C1, C2, etc.
I can't see these "C" marking described anywhere in the article. Have I missed it or is this an omission?
Marchino61 (talk) 00:50, 26 June 2019 (UTC)
thread_title:  C, C1, C2. What are they? 

message: This article says the plimsoll line and waterline are the same thing. They are not. The waterline is the intersection of the hull and the water surface. The plimsoll line is a maximum lading mark that only coincides with the waterline when the craft is fully laden - and then only at one point.
The two concepts should be treated separately, and would probably be better in separate articles. SLR Ellison (talk) 18:32, 2 January 2021 (UTC)
replies: text: Additionally, in naval architecture, a waterline can mean any line on the hull surface that is in a plane parallel to the surface of the water when the hull is in equilibrium in calm water. In other words, a waterline is one of a "ship's lines" - the contours that show the shape of a hull.ThoughtIdRetired (talk) 19:23, 2 January 2021 (UTC)
thread_title:  The plimsoll line is not the waterline