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Explain xkcd: It's 'cause you're dumb.
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* Discussion about various parts of the wiki is going on at [[Explain XKCD:Community portal]]. Share your 2¢!
 
* Discussion about various parts of the wiki is going on at [[Explain XKCD:Community portal]]. Share your 2¢!
  
* [[List of all comics]] contains a complete table of all xkcd comics so far and the corresponding explanations. The missing explanations are listed [[List of unexplained comics|here]]. Feel free to help out by creating them! '''[[Help:How to add a new comic explanation|Here's how]]'''.
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* [[List of all comics]] contains a table of most recent xkcd comics and links to the rest, and the corresponding explanations. There are incomplete explanations listed [[:Category:Incomplete articles|here]]. Feel free to help out by expanding them!
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* We've actually now created pages for all xkcd comics but if you've arrived here early and a new comic hasn't been explained, you can create it: '''[[Help:How to add a new comic explanation|Here's how]]'''.
  
 
== Rules ==
 
== Rules ==
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If you want to talk about a specific comic, use its discussion page.
 
If you want to talk about a specific comic, use its discussion page.
  
Please only submit material directly related to —and helping everyone better understand— xkcd... and of course ''only'' submit material that can legally be posted (and freely edited.) Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.
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Please only submit material directly related to —and helping everyone better understand— xkcd... and of course ''only'' submit material that can legally be posted (and freely edited).  Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.
  
 
If you need assistance from an [[explain xkcd:Administrators|admin]], post a message to the [[explain xkcd:Community portal/Admin requests|Admin requests]] board.
 
If you need assistance from an [[explain xkcd:Administrators|admin]], post a message to the [[explain xkcd:Community portal/Admin requests|Admin requests]] board.
  
 
[[Category:Root category]]
 
[[Category:Root category]]

Revision as of 15:13, 20 June 2013

Welcome to the explain xkcd wiki!

We have an explanation for all 6 xkcd comics, and only 0 (0%) are incomplete. Help us finish them!

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Ocean Loop
I can't believe they wouldn't even let me hold a vote among the passengers about whether to try the loop.
Title text: I can't believe they wouldn't even let me hold a vote among the passengers about whether to try the loop.

Explanation

Ambox notice.png This explanation may be incomplete or incorrect: Created by an EXCITED ROLLER COASTER ENTHUSIAST - Please change this comment when editing this page. Do NOT delete this tag too soon.

Upon hearing the term "ocean loop", many people think of horizontal ocean gyres or ocean currents. This comic illustrates a vertical, rather than horizontal, ocean loop.

The comic shows a large construction, rising out of the sea to dwarf a nearby cruise ship. It involves a submerged water-jet sending water up out of the surface and round a rollercoaster-loop-like water-flume trough. The scale is such that it seems that the ship, once caught in the necessarily powerful stream of water, is also intended to be propelled around the inverting loop before "safely" exiting at the other side.

Apart from various other issues regarding large "loop-de-loops", the stream of water required to maintain this setup would be acting upon the nearby water and so the nearby ship is probably already close enough to be drawn into the loop (with the best option left being to deliberately steer into it, rather than risk being swept uncontrollably into the structure), assuming that it isn't already caught in the tug of the water-jet's inward flow.

Even assuming a "successful" loop (the stresses, and rotation, inflicted by the loop are likely beyond the design limits of such a vessel), the emergence back into the relatively calm and stationary waters beyond the exiting outflow would be a severe challenge to navigation. On the positive side, due to the nature of buoyancy, if the loop structure itself is capable of withstanding the force of the water being forced round it then it should be equally capable of withstanding the passage of the ship, unlike an impromptu rail-based loop which might stand up on its own but then shake itself apart when the first carriage is sent around it.

Not only would there be problems for the engineers, ship and navigators, the "ride" wouldn't be pleasant for the ship's passengers in any way. Many of the passengers would suffer extreme injuries from the changes of velocity (up to 230 mph based on a loop radius of 3 x ship length) and rotation (unlike rollercoasters, or even airplanes during simple take-off and landing, passengers aren't normally strapped down). It is possible that the initial extreme undercurrent would capsize the ship. Depending upon where in the ship you were, the centripetal forces and the ship's rotation may not match for all passengers, forcing anyone not properly secured out towards the bow or stern. As well as the passengers, this also is relevant to all unsecured items (e.g. knives and forks would go flying off tables), as well as the dangers of breakable glass, liquids and many other dangerous objects which could create hazards even (or particularly) against those who have strapped themselves down to prevent their own movement through the ship.

Because of all these safety concerns, the caption, "I don't know why the cruise line fired me", suggests that someone in the company realized this would not be a good idea, and shut down the concept. However, the title text, "I can't believe they wouldn't even let me hold a vote among the passengers about whether to try the loop", implies that the narrator (whether because they simply hadn't thought it through properly, or they are someone with a sadistic nature) actually managed to get as far as building this loop and having a ship ready to try it. Considering the vast budget that would have been required to realise this concept, it appears that oversight at the cruise company is not what it could be, and perhaps others should be in line for firing as well (if it has not already bankrupted the company).

When those in charge of the ship objected to sailing into this loop, the builder attempted to get around this by having the passengers vote on it. Presumably worried that opening the decision-making process to the passengers might favor the exciting risk over the well-founded reason of the staff, those in charge put a stop to that too. Cruise ships generally don't function as democracies, even outside of absurd situations such as the one depicted.

Transcript

Ambox notice.png This transcript is incomplete. Please help editing it! Thanks.
[A cruise ship approaches an enormous loop-de-loop flume from the left. A large jet of water is being propelled into the loop-de-loop by a hot tub style jet. The loop-de-loop that looks like a waterslide is connected to a rocky shore line, the latter is slowly rising as it approaches the right side of the panel.]
[Caption below the panel:]
I don't know why the cruise line fired me.

Trivia

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If you want to talk about a specific comic, use its discussion page.

Please only submit material directly related to —and helping everyone better understand— xkcd... and of course only submit material that can legally be posted (and freely edited). Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.

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