Talk:Draft (hull)

Too much
This article has too many different concepts in one place. May I suggest that "Variations of the draft" and "The implications of draft be removed".

Text on how draft is calculated should be added.

Jmvolc (talk) 14:27, 3 January 2008 (UTC)

I disagree. All the concepts mentioned are closely related to the topic, and the article itself isn't all that long. What forces cause draft variation and what effects draft has are critical info, and they certainly don't deserve their own articles.--Subversive Sound (talk) 22:21, 12 March 2010 (UTC)

Draught Calculation
I have been advised by an engineer to calculate by using, what is known as the metacentre. By research I have found the International Marine Centre on the big Island of Hawaii has the computer with the software for doing this calculation for all ships, tankers, and barges. I am a new member that has had the experience of working with aircraft weight and balance, so I was not surprised to find that with ships there is a number of factors that have to be calculated in order to find the proper draught before you launch your ship, A.H.H., Calgary Alberta. —Preceding unsigned comment added by Abhurst (talk • contribs) 21:24, 16 July 2008 (UTC)


 * Shouldn't the first sentence describe Draught for an UNLADEN ship (e.g. largely empty?) 2600:6C48:7006:200:B056:6066:1296:EF0B (talk) 04:23, 10 December 2018 (UTC)

Draft and Ship Size
If the port of Douala has a draft of 8.5m, what size ship in tonnes does this relate to? 08:17, 1 August 2011 (UTC). The port does not have a draft- they establish and restrict vessel entrance to vessels of less than or equal to a set value- based on the harbor water depth across regions ships transit. I'm American - so I think in feet - that approximately 25 feet. Too much variability to other dimensions of the ship (length, beam, hull shape)- I'll leave it to you to look up ships and see the draft. Wfoj3 (talk) 00:35, 12 April 2014 (UTC)

Dragon boats?
For example: Ballasts placed very low in the keel of a boat such as a dragon boat with a draft of 1.20 m for a length of 8.90 m. Umm, show me a dragon boat that has a draft of 1.20 meters. This has to be a typo. These are long, narrow and have a lo draft. --98.246.156.76 (talk) 03:43, 30 July 2013 (UTC)

Draft, Draught, Calculation Draft and Navigational Draft.
Ok - Are other certain Draft & Draught are the exact same concept, just country of use. US Navy ship will have 2 sets of Draft markings- One set match the concept presented = measured from the Keel (bottom of the hull) to the waterline. This draft is used for entry into tables to determine vessel's current Displacement. The second marking is Navigational drafts- measures down to the lowest/deepest portion of the ship in the water. IN some cases it is to the bottom of the Sonar dome - if present - is usually below the Keel. Different ships have different designs- Some ships have the propellor shaft at an angle - instead of parallel to the keel, and the vessels project the propeller and possible also the rudder below the keel   74.214.55.19 (talk) 00:51, 6 January 2015 (UTC)

Meaning of "with the thickness of the hull included"
Someone please explain the bold of the following:

"is the vertical distance between the waterline and the bottom of the hull (keel), with the thickness of the hull included" 2A02:120B:2C12:9540:F575:4E97:50CF:AC87 (talk) 04:44, 6 February 2017 (UTC)

That sentence is wretched, and I’m strongly inclined to simplify it. I think someone means that the “draft” measurement goes all the way to the bottommost part of the vessel, and the “draft outline” means something like the bottom of the interior space of the vessel. That, however, is entirely irrelevant to the way “draft” is used, which is all about having enough water under your keel that your vessel doesn’t run aground. I can’t find any other reference, online or in hardcopy sources, for the term “draft outline”. The only places it turns up are direct copies of this Wikipedia article, which is bad. No one should be copying this awkward and possible meaningless phrasing as though it’s authoritative. --Oxymetheus (talk) 01:38, 29 March 2021 (UTC)

Draft marks
I do not know of any US specifications for the dimensions of the draft marks. does not have any size guidelines, just the general legibility and uniformity requirements. The military manual (p. 7-3) indeed indicates 6 in tall letters with 1 ft ticks (this allows easy measurements with the increment of 3 in). Викидим (talk) 00:25, 19 June 2023 (UTC)