Why Do Ships Carry Less In Winter?

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——————-ABOUT THIS VIDEO——————-
In this video, we look at why ships carry less cargo in the winter.
We cover the loadline, and different criteria in different areas around the world for the summer load line, winter load line and tropical load line.

We also touch on the fresh water load line, and discuss additional capacity available through the timber load lines.

00:00 – Intro
00:28 – Advertisement
01:41 – Circular Part
02:02 – Freeboard Deck
02:21 – Letters on a Load Line
02:58 – Summer Load Line
03:23 – Fresh Water Load Line
03:56 – Tropical Load Line
04:21 – Winter Load Line
05:52 – Timber Load Line
06:38 – How The Load Line Works On A Passage

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★ Images used under license from shutterstock.com
Evolution of Ships – Mind Pixell / Shutterstock.com
Mountain Lake – Amanita Silvicora / Shutterstock.com
Palm and Banana Trees – Daiquiri / Shutterstock.com
Snowflakes – Krushevskaya / Shutterstock.com

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Comment (566)

  1. I assumed it was because of the difference density of cold vs warm water.

    (but now that I thought about it it would be exactly the opposite. Cold water is more dense)

  2. Well, the video didn't explain at all the title. Sure, there are load lines, but warm water is less dense than cold, so it should be intuitively vice versa. When I quickly searched internets, it seems the reason is weather and waves, which tend to be worse in winter.

  3. Fun fact: Airplane normally can carry more in winter due to colder thus denser air, and better cooling for engine performance.
    And bad weather for aircraft also less in winter due to less convection movement, but some other weather condition like fog depends on where you are.

  4. I think it's worth mentioning that the load line was originally called the Plimsoll line after Samuel Plimsoll who convinced parliament to pass a law requiring it in 1872 in an effort to stop overloading vessels. We still call it a Plimsoll interchangeably with load line to this day.

  5. A point you glossed over that I'm interested in:

    Ships are watertight up to a certain point. I've heard about this a lot when talking about how sinking ships are basically doomed once flooding goes above the watertight compartments. Why aren't watertight compartments built from the bottom all the way to the top?

    Just something that always confused me (non-sailor)

  6. Anyone who has ever sailed a ship across the North Atlantic in Winter can tell you exactly why the WNA load line is higher. Hurricanes can be bad for a little while, but the North Atlantic in Winter is rough day after day after day…

  7. Ok so bad weather sinking the ship is the answer to the ‘why’ . The rest of the video is talking about the ‘how’. As in how do ship captains know how much cargo to load. Kinda wish you covered the why in more detail first.

    You got potential my friend. Loved the animations and presentation.

    Follow up question: if a ship is getting loaded in China and travels through all kinds of weathers by the time it gets to … New York. How do they decide how much to load the ship?

    Oo Oo maybe a little more science related video but would be cool to learn about how different ships make themselves more buoyant so they can take even more cargo.

  8. Surprised less freeboard is required for freshwater considering the weather on some bodies of fresh water (like Lake Superior in Winter) is no joke and has been known to even break ships in half.

  9. i mean i though since its winter the water is more dense and denser water means more buoyancy which i though it results to more load to be carried. could someone clarify please.

  10. I can usually do more in the winter than in the summer so was a bad comparison 😀 Spring and fall is probably most effective time thou, because the snow and ice makes it harder.

  11. I did a tour of the paddle steamer Waverley in dry dock. Due to regs regarding placement, her Plimsol lines are inside each sponson where the paddle wheel is, and is between the wheel and the hull so is impossible to see normally.

  12. This is realy interesting! Who enforces these rules? Its smart to obey them since they are in place for your safety, but i would imagine that there are still some who would disregard them if theres money to be made,


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