User talk:DavidGPeters

Welcome to Wikimedia Commons, DavidGPeters!

First steps tutorial Our first steps tour and our FAQ will help you a lot after registration. They explain how to customize the interface (for example the language), how to upload files and our basic licensing policy. You don't need technical skills in order to contribute here. Be bold contributing here and assume good faith for the intentions of others. This is a wiki—it is really easy. Getting help More information is available at the community portal. You may ask questions at the help desk, village pump or on IRC channel irc:wikimedia-commons #wikimedia-commons (direct access). You can also contact an administrator on their talk page. If you have a specific copyright question, ask at Commons talk:Licensing.		Goodies, tips and tricks Put Babel boxes on your user page so others know what languages you can speak and indicate your graphic abilities. All your uploads are stored in your personal gallery Please sign your name on Talk pages by typing ~~~~ Use the CommonSense tool to find good categories for your files (then other people can find them too!) To link to an image page without embedding the image, type: `[[:Image:Foo.jpg]]`, which produces: `Image:Foo.jpg` If you're copying files from another project, be sure to use the CommonsHelper Made a mistake? Did you want to rename or move a file? Simply upload the file again and mark the old one like this: `{{bad name\|correct name}}` For more information read the full deletion guidelines.
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Tip: Categorizing images

Afrikaans ∙ العربية ∙ беларуская (тарашкевіца) ∙ বাংলা ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ Deutsch (Sie-Form) ∙ Ελληνικά ∙ English ∙ Esperanto ∙ español ∙ فارسی ∙ suomi ∙ français ∙ galego ∙ עברית ∙ magyar ∙ íslenska ∙ italiano ∙ 日本語 ∙ ქართული ∙ 한국어 ∙ македонски ∙ മലയാളം ∙ norsk bokmål ∙ Plattdüütsch ∙ Nederlands ∙ norsk ∙ polski ∙ português ∙ português do Brasil ∙ română ∙ русский ∙ sicilianu ∙ slovenčina ∙ slovenščina ∙ српски / srpski ∙ svenska ∙ Türkçe ∙ українська ∙ Tiếng Việt ∙ 中文（简体）‎ ∙ 中文（繁體）‎ ∙ +/−

Hello, DavidGPeters!

Thanks a lot for contributing to the Wikimedia Commons! Here's a tip to make your uploads more useful: Why not add some categories to describe them? This will help more people to find and use them.

Here's how:

1) If you're using the UploadWizard, you can add categories to each file when you describe it. Just click "more options" for the file and add the categories which make sense:

2) You can also pick the file from your list of uploads, edit the file description page, and manually add the category code at the end of the page.

[[Category:Category name]]

For example, if you are uploading a diagram showing the orbits of comets, you add the following code:

[[Category:Astronomical diagrams]]

[[Category:Comets]]

This will make the diagram show up in the categories "Astronomical diagrams" and "Comets".

When picking categories, try to choose a specific category ("Astronomical diagrams") over a generic one ("Illustrations").

Thanks again for your uploads! More information about categorization can be found in Commons:Categories, and don't hesitate to leave a note on the help desk.

BotMultichillT 05:45, 8 October 2009 (UTC)[reply]

Image:Kreisel-während-Präzession.png was uncategorized on 7 October 2009.
Image:Abb.3.png was uncategorized on 3 November 2009 CategorizationBot (talk) 10:41, 4 November 2009 (UTC)[reply]
Image:Abb.5.png was uncategorized on 3 November 2009 CategorizationBot (talk) 10:41, 4 November 2009 (UTC)[reply]
Image:Abb.4.png was uncategorized on 3 November 2009 CategorizationBot (talk) 10:41, 4 November 2009 (UTC)[reply]
Image:Kreisel-losgelassen.png was uncategorized on 4 November 2009 CategorizationBot (talk) 10:41, 5 November 2009 (UTC)[reply]
Image:Kreisel-beidseitig-gestützt.png was uncategorized on 4 November 2009 CategorizationBot (talk) 10:41, 5 November 2009 (UTC)[reply]
Image:Gleichförmig-präzedierender-Kreisel.png was uncategorized on 4 November 2009 CategorizationBot (talk) 10:41, 5 November 2009 (UTC)[reply]

File:Abb.4.png

File:Abb.4.png has been listed at Commons:Deletion requests so that the community can discuss whether it should be kept or not. We would appreciate it if you could go to voice your opinion about this at its entry.

If you created this file, please note that the fact that it has been proposed for deletion does not necessarily mean that we do not value your kind contribution. It simply means that one person believes that there is some specific problem with it, such as a copyright issue. Please see Commons:But it's my own work! for a guide on how to address these issues.

Please remember to respond to and – if appropriate – contradict the arguments supporting deletion. Arguments which focus on the nominator will not affect the result of the nomination. Thank you!

Afrikaans ∙ Bahasa Indonesia ∙ bosanski ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ Deutsch (Sie-Form)‎ ∙ eesti ∙ English ∙ español ∙ Esperanto ∙ français ∙ galego ∙ hrvatski ∙ íslenska ∙ italiano ∙ magyar ∙ Nederlands ∙ norsk bokmål ∙ norsk nynorsk ∙ occitan ∙ Plattdüütsch ∙ polski ∙ português ∙ português do Brasil ∙ română ∙ shqip ∙ sicilianu ∙ slovenčina ∙ slovenščina ∙ suomi ∙ svenska ∙ Tiếng Việt ∙ Türkçe ∙ Zazaki ∙ Ελληνικά ∙ беларуская ∙ беларуская (тарашкевіца)‎ ∙ български ∙ македонски ∙ русский ∙ српски / srpski ∙ українська ∙ հայերեն ∙ বাংলা ∙ മലയാളം ∙ ပအိုဝ်ႏဘာႏသာႏ ∙ မြန်မာဘာသာ ∙ ไทย ∙ 조선말 ∙ 한국어 ∙ 日本語 ∙ 简体中文‎ ∙ 繁體中文‎ ∙ עברית ∙ العربية ∙ پښتو ∙ فارسی ∙ ދިވެހިބަސް ∙ +/−

84.97.149.219 15:01, 6 April 2012 (UTC)[reply]

File:Abb.3.png

File:Abb.3.png has been listed at Commons:Deletion requests so that the community can discuss whether it should be kept or not. We would appreciate it if you could go to voice your opinion about this at its entry.

If you created this file, please note that the fact that it has been proposed for deletion does not necessarily mean that we do not value your kind contribution. It simply means that one person believes that there is some specific problem with it, such as a copyright issue. Please see Commons:But it's my own work! for a guide on how to address these issues.

Please remember to respond to and – if appropriate – contradict the arguments supporting deletion. Arguments which focus on the nominator will not affect the result of the nomination. Thank you!

Afrikaans ∙ Bahasa Indonesia ∙ bosanski ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ Deutsch (Sie-Form)‎ ∙ eesti ∙ English ∙ español ∙ Esperanto ∙ français ∙ galego ∙ hrvatski ∙ íslenska ∙ italiano ∙ magyar ∙ Nederlands ∙ norsk bokmål ∙ norsk nynorsk ∙ occitan ∙ Plattdüütsch ∙ polski ∙ português ∙ português do Brasil ∙ română ∙ shqip ∙ sicilianu ∙ slovenčina ∙ slovenščina ∙ suomi ∙ svenska ∙ Tiếng Việt ∙ Türkçe ∙ Zazaki ∙ Ελληνικά ∙ беларуская ∙ беларуская (тарашкевіца)‎ ∙ български ∙ македонски ∙ русский ∙ српски / srpski ∙ українська ∙ հայերեն ∙ বাংলা ∙ മലയാളം ∙ ပအိုဝ်ႏဘာႏသာႏ ∙ မြန်မာဘာသာ ∙ ไทย ∙ 조선말 ∙ 한국어 ∙ 日本語 ∙ 简体中文‎ ∙ 繁體中文‎ ∙ עברית ∙ العربية ∙ پښتو ∙ فارسی ∙ ދިވެހިބަސް ∙ +/−

84.97.149.219 15:02, 6 April 2012 (UTC)[reply]

File:Abb.5.png

File:Abb.5.png has been listed at Commons:Deletion requests so that the community can discuss whether it should be kept or not. We would appreciate it if you could go to voice your opinion about this at its entry.

If you created this file, please note that the fact that it has been proposed for deletion does not necessarily mean that we do not value your kind contribution. It simply means that one person believes that there is some specific problem with it, such as a copyright issue. Please see Commons:But it's my own work! for a guide on how to address these issues.

Please remember to respond to and – if appropriate – contradict the arguments supporting deletion. Arguments which focus on the nominator will not affect the result of the nomination. Thank you!

Afrikaans ∙ Bahasa Indonesia ∙ bosanski ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ Deutsch (Sie-Form)‎ ∙ eesti ∙ English ∙ español ∙ Esperanto ∙ français ∙ galego ∙ hrvatski ∙ íslenska ∙ italiano ∙ magyar ∙ Nederlands ∙ norsk bokmål ∙ norsk nynorsk ∙ occitan ∙ Plattdüütsch ∙ polski ∙ português ∙ português do Brasil ∙ română ∙ shqip ∙ sicilianu ∙ slovenčina ∙ slovenščina ∙ suomi ∙ svenska ∙ Tiếng Việt ∙ Türkçe ∙ Zazaki ∙ Ελληνικά ∙ беларуская ∙ беларуская (тарашкевіца)‎ ∙ български ∙ македонски ∙ русский ∙ српски / srpski ∙ українська ∙ հայերեն ∙ বাংলা ∙ മലയാളം ∙ ပအိုဝ်ႏဘာႏသာႏ ∙ မြန်မာဘာသာ ∙ ไทย ∙ 조선말 ∙ 한국어 ∙ 日本語 ∙ 简体中文‎ ∙ 繁體中文‎ ∙ עברית ∙ العربية ∙ پښتو ∙ فارسی ∙ ދިވެހިބަސް ∙ +/−

84.97.149.219 15:03, 6 April 2012 (UTC)[reply]

Your carbon fibre calculations at Titan talk page

Hi David, I read your interesting calculations on the Titan talk page, which someone has decided to delete sadly. I have a question though: you said that the 200N/mmsq load was above the compression strength limits for carbon fibre. I'm asking this to further my knowledge, not to doubt what you wrote. Wouldn't the point at which carbon fibre failed (under compression) depend on its thickness (and its shape)?

You might have factored these things into your calculation - forgive me if so. 2A00:23EE:2120:27FF:9144:358:E282:BAC0 18:15, 28 June 2023 (UTC)[reply]

Hello, thank you for your reply. Why would anyone delete something like that, from a discussion page of all things? Anyway, the calculation is very simple, using the water pressure and the size of the cylindrical part of the submersible, and by applying the force thus calculated to the cross-sectional area of the wall, which is well-known. This way, one immediately arrives at about 200N/mm². DavidGPeters (talk) 20:40, 28 June 2023 (UTC)[reply]

I found the deletion bizarre. But Wikipedia is bizarre.

Okay, I get the 200N/mmsq part. But I was more interested in how you concluded that this pressure was beyond the compressive strength of carbon-fibre. The thickness of the carbon-fibre is surely important? In the case of Titan, it was apparently 5 inches thick. Supposing it was 50 inches thick, or 500 inches thick? (I'm just in thought-experiment territory here, so bear with me).

What I'm getting at is, with sufficiently/infinitely thick walls (and disregarding all other real-world factors like weight/mass/buoyancy) couldn't one make a pressure hull out of laminated wood that would survive those pressures? 2A00:23EE:2120:27FF:C124:1C14:EFDC:8213 21:53, 28 June 2023 (UTC)[reply]

The important thing is that the pressure is relative per square millimeter. And a known order of magnitude at which carbon laminate fails in compression is 200 N/mm². Of course, the stress would be half as much if the walls were twice as thick, and twice as large if the walls were half as thick, and so on. DavidGPeters (talk) 22:00, 28 June 2023 (UTC)[reply]

Btw, about the same discussion is still available here:

https://en.wikipedia.org/wiki/Talk:Titan_(submersible)#Safety_factor_%3D_1 DavidGPeters (talk) 22:01, 28 June 2023 (UTC)[reply]

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