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This articles completely fails to address wave making resistance.
There is no discussion on the history (Kelvin, Taylor, Froude, etc.) and the note on "out running the bow wave" is rubbish! I apologize for the force of my comments but this article is tantamount to mis-leading the public. A re-write will follow in short order Jmvolc ( talk) 00:56, 29 January 2008 (UTC)
Seriously, the metric unit should be up front and on the figure. Liberia and US, wake up.
I propose that the article Hull speed be merged into this one, and that replaced by a redirect to here. The reasons for this include:
Maybe what we need is a new section here called 'Hull speed' that makes the connection between the concepts explicit. Then we need to try to find some references for statements and equations used here. Thoughts and suggestions? -- Nigelj ( talk) 20:55, 17 September 2010 (UTC)
Both graphs would be useful if units were provided. Artreve ( talk) 15:20, 1 November 2011 (UTC)
In the current version, the terms "bow wave" and "stern wave" are introduced without any explanation of what they refer to. These terms are critical to understanding the topic, but their definitions would surely be completely unknown to most readers. What makes the matter worse is that many readers will likely think they do understand them. Especially, most readers will assume that the bow crest, which is easily perceived and visible, is the same as the "bow wave". But there is no way to reconcile this conflation of "bow crest" and "bow wave" with the theory. On the contrary, the interference pattern of bow wave and stern wave does not occur exclusively at the location of the bow crest. To say, as is true, that the bow wave and stern wave interfere, one must regard both of them not as occurring in some restricted region of time or space, but as being infinite in both. Or. on some subset of time and space with some specified initial and boundary conditions.
I think that the introductory session needs to be rewritten by someone who understands the physics. (I do not, but my guess is that "bow wave" and "stern wave" are concepts involving superposition: that they are not so much real detectable objects but mathematical constructs, just like the components of a real wave in Fourier analysis; the actual wave (infinite in all four dimensions) is understood as the linear combination of two unreal (conceptual) objects: a bow wave which would actually exist if the vessel had a defined bow but extended infinitely aft for an infinite duration, plus a stern wave which would be a real four-dimensional wave if the vessel extended infinitely forward forever and terminated aft with the actual shape of the stern.)
Mark.camp ( talk) 20:37, 16 July 2014 (UTC)
There is no reference given for this statement:
"Waves generated by a ship are affected by her geometry and speed, and most of the energy given by the ship for making waves is transferred to water through the bow and stern parts.
Could a reference please be given by the author?
The statement is not only unreferenced, but it is not at all clear to me as a reader. In particular, I don't know what is meant by, for example, "stern parts". I'm sure that an area of the hull just below the water and near the stern must be one of the "stern parts", but I don't know what it means that this area is "giving energy for making waves". Intuitively, I assume that this area is consuming energy, not giving it, since the force on it is partly in the direction of motion. I think that this is what Newton's laws say.
Mark.camp ( talk) 22:49, 30 November 2014 (UTC)
It might be beneficial to change length in the equation 4/3*sqrt(length) to water line especially when talking about sailboats. There is often a pretty substantial difference between water line and deck length so I personally believe that it be possibly misleading some that don't understand the difference of the two. Many modern race boats have almost plumb bow's with fine entries where the difference between waterline and overall length is minimized which gives them the benefit of being faster by increased water line length among other things. — Preceding unsigned comment added by 130.85.250.102 ( talk) 16:26, 20 October 2016 (UTC)
This article is rated Start-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||
|
This articles completely fails to address wave making resistance.
There is no discussion on the history (Kelvin, Taylor, Froude, etc.) and the note on "out running the bow wave" is rubbish! I apologize for the force of my comments but this article is tantamount to mis-leading the public. A re-write will follow in short order Jmvolc ( talk) 00:56, 29 January 2008 (UTC)
Seriously, the metric unit should be up front and on the figure. Liberia and US, wake up.
I propose that the article Hull speed be merged into this one, and that replaced by a redirect to here. The reasons for this include:
Maybe what we need is a new section here called 'Hull speed' that makes the connection between the concepts explicit. Then we need to try to find some references for statements and equations used here. Thoughts and suggestions? -- Nigelj ( talk) 20:55, 17 September 2010 (UTC)
Both graphs would be useful if units were provided. Artreve ( talk) 15:20, 1 November 2011 (UTC)
In the current version, the terms "bow wave" and "stern wave" are introduced without any explanation of what they refer to. These terms are critical to understanding the topic, but their definitions would surely be completely unknown to most readers. What makes the matter worse is that many readers will likely think they do understand them. Especially, most readers will assume that the bow crest, which is easily perceived and visible, is the same as the "bow wave". But there is no way to reconcile this conflation of "bow crest" and "bow wave" with the theory. On the contrary, the interference pattern of bow wave and stern wave does not occur exclusively at the location of the bow crest. To say, as is true, that the bow wave and stern wave interfere, one must regard both of them not as occurring in some restricted region of time or space, but as being infinite in both. Or. on some subset of time and space with some specified initial and boundary conditions.
I think that the introductory session needs to be rewritten by someone who understands the physics. (I do not, but my guess is that "bow wave" and "stern wave" are concepts involving superposition: that they are not so much real detectable objects but mathematical constructs, just like the components of a real wave in Fourier analysis; the actual wave (infinite in all four dimensions) is understood as the linear combination of two unreal (conceptual) objects: a bow wave which would actually exist if the vessel had a defined bow but extended infinitely aft for an infinite duration, plus a stern wave which would be a real four-dimensional wave if the vessel extended infinitely forward forever and terminated aft with the actual shape of the stern.)
Mark.camp ( talk) 20:37, 16 July 2014 (UTC)
There is no reference given for this statement:
"Waves generated by a ship are affected by her geometry and speed, and most of the energy given by the ship for making waves is transferred to water through the bow and stern parts.
Could a reference please be given by the author?
The statement is not only unreferenced, but it is not at all clear to me as a reader. In particular, I don't know what is meant by, for example, "stern parts". I'm sure that an area of the hull just below the water and near the stern must be one of the "stern parts", but I don't know what it means that this area is "giving energy for making waves". Intuitively, I assume that this area is consuming energy, not giving it, since the force on it is partly in the direction of motion. I think that this is what Newton's laws say.
Mark.camp ( talk) 22:49, 30 November 2014 (UTC)
It might be beneficial to change length in the equation 4/3*sqrt(length) to water line especially when talking about sailboats. There is often a pretty substantial difference between water line and deck length so I personally believe that it be possibly misleading some that don't understand the difference of the two. Many modern race boats have almost plumb bow's with fine entries where the difference between waterline and overall length is minimized which gives them the benefit of being faster by increased water line length among other things. — Preceding unsigned comment added by 130.85.250.102 ( talk) 16:26, 20 October 2016 (UTC)