• Sneezycat@sopuli.xyz
      link
      fedilink
      English
      arrow-up
      24
      ·
      6 months ago

      Let’s do the math…

      You can donate three times a year to the red cross (once every 112 days). According to some page, you donate around 10% of your blood volume each time.

      That means, for a volume equivalent of 300 people, you’d need to donate 3000 times, which would take around 1000 years.

      The vampire is going to need more people, or to keep a person alive 1000 years with vampire magic.

      • kernelle@lemmy.world
        link
        fedilink
        English
        arrow-up
        10
        ·
        6 months ago

        When you’re harvesting the blood iron of your enemies you don’t have time for ethics. A controlled study managed 4 weeks within ethical boundaries, maybe we can cut that in half unethically. So 14 days, 3000 . 14 = 115 years. So when you torture two people, you could manage to do 58 years. Better start early!

      • Mikufan@ani.social
        link
        fedilink
        English
        arrow-up
        3
        ·
        6 months ago

        3 times a year? Where i live you cab give 1/2l every two weeks at a bloodbank.

        And i can take more and by that activate a immune response to produce way more.

      • variants@possumpat.io
        link
        fedilink
        English
        arrow-up
        2
        ·
        6 months ago

        But remember they are your enemy so you could drain a bit more blood more often to shave a few years off maybe

    • knorke3@lemm.ee
      link
      fedilink
      English
      arrow-up
      2
      ·
      6 months ago

      But then you need to feed them iron-rich foods which could be used to make a vegan alternative instead, expanding your potential market.

  • cobra89@beehaw.org
    link
    fedilink
    English
    arrow-up
    34
    ·
    6 months ago

    Id love to see the math on the amount of iron in a person’s blood, because I find it HIGHLY questionable that there’s enough iron in only 300 people to make a full iron sword. I’m too lazy to do it myself though.

  • Onno (VK6FLAB)@lemmy.radio
    link
    fedilink
    English
    arrow-up
    35
    arrow-down
    2
    ·
    6 months ago

    These are the required elements for making steel:

    • Iron
    • Carbon
    • Manganese
    • Chromium
    • Phosphorus
    • Sulphur
    • Nickel
    • Molybdenum
    • Titanium
    • Copper
    • Boron

    Source: https://www.cliftonsteel.com/education/11elementsfoundinsteel

    So, iron is only step 1. Humans are carbon based lifeforms, so I’m guessing that carbon is also sorted, that’s step 2.

    There’s plenty of other elements in the human body, like phosphorus and sulphur, but I’m guessing that it’s going to take more than 300 adults.

    Source: https://sciencenotes.org/elements-in-the-human-body-and-what-they-do/

    Source: https://sciencenotes.org/wp-content/uploads/2019/02/PeriodicTableHumanBody.png

    • general_kitten@sopuli.xyz
      link
      fedilink
      English
      arrow-up
      20
      ·
      6 months ago

      Steel requires only iron and up to about 2% carbon

      Rest are minor alloying elements used mainly in modern steel alloys to improve the steel beyond what just carbon steel could do like for example stainless steels

    • sushibowl@feddit.nl
      link
      fedilink
      English
      arrow-up
      16
      ·
      6 months ago
      1. Your link says these are elements commonly found in steel, not that they are all required. In fact it says of phosphorus and sulphur that they are generally undesirable.
      2. We don’t need to make a steel sword, an iron sword could do.

      Either way you would definitely need carbon, but as you say that’s pretty easy. I don’t think any of the other elements are absolutely required.

    • barsoap@lemm.ee
      link
      fedilink
      English
      arrow-up
      3
      ·
      6 months ago

      You only need iron and carbon the rest is already alloyed steel. You can definitely make a good blade out of only iron and carbon, it won’t be stainless, it might be difficult to harden just right, but it will be flexible and hold a keen edge if forged right. The smiths of ole dealt with nastier steels containing all kinds of things making it worse, not better (such as excessive amounts of sulphur and phosphorus) so I’d say they’d manage.

    • marcos@lemmy.world
      link
      fedilink
      English
      arrow-up
      2
      ·
      6 months ago

      Well, the non-metals and Manganese are way more available than iron anyway (probably molybdenum too). But it will be really difficult to create high-quality steel.

  • Mossy Feathers (They/Them)@pawb.social
    link
    fedilink
    English
    arrow-up
    30
    arrow-down
    1
    ·
    6 months ago

    Listen. If they used surplus blood to do this (blood that was expired) and then held a raffle at the end of each year where all blood donors were entered to win a knife or sword made from the expired human blood iron, I bet they’d see blood donations skyrocket.

  • KillingTimeItself@lemmy.dbzer0.com
    link
    fedilink
    English
    arrow-up
    28
    ·
    6 months ago

    ok, but humans also regenerate blood, very slowly but it does happen. So theoretically, you could contract your family members to draw blood to be used to make a longsword out of your family’s bloodline. And have it become an heirloom.

  • 9point6@lemmy.world
    link
    fedilink
    English
    arrow-up
    20
    ·
    6 months ago

    You could also get a big sword-shaped ice cube mold, a chest freezer and probably not even a whole enemy.

    You would have to do battle in freezing climates too though in order for it to remain physically effective

    Though I imagine the psychological effectiveness might persist a bit longer

  • Wirlocke@lemmy.blahaj.zone
    link
    fedilink
    English
    arrow-up
    18
    ·
    6 months ago

    Listen there’s definitely enough carbon in the body to boost that into a steel sword.

    If we can make diamonds out of corpses, we can make steel.

        • merc@sh.itjust.works
          link
          fedilink
          English
          arrow-up
          8
          ·
          6 months ago

          Way too brittle if it was the weight of a typical sword, and way too heavy otherwise.

          On the other hand, the cutting edge of that sword would be pretty amazing while it lasted.

            • merc@sh.itjust.works
              link
              fedilink
              English
              arrow-up
              3
              ·
              6 months ago

              Do you mean just the edge? Because with a sword basically the whole thing other than the handle is the blade.

              But yeah, with a tiny diamond edge you’d probably have the best of both worlds, a light, flexible sword with an ultra-sharp cutting edge.

              Still, the edge probably wouldn’t last for long. If the diamond was attached to a steel blade and the blade flexed, the diamond couldn’t flex and would probably snap.

  • Megaman_EXE@beehaw.org
    link
    fedilink
    English
    arrow-up
    13
    ·
    6 months ago

    I was curious how long it would take to make a sword out of your own blood. If my math was correct(it probably isn’t lol) the human body contains around 4.7 to 5.5 liters. And then you can apparently donate like 470 millileters every 8 weeks.

    So take 4.7(assuming the smallest people) X 300 = 1410 L total blood

    1410(total needed) / 0.47(donation amount) = 3000 donations X 8 weeks = 24,000 / 52 = 461.54 years

    • Dave@lemmy.nz
      link
      fedilink
      English
      arrow-up
      6
      ·
      edit-2
      6 months ago

      And then you can apparently donate like 470 millileters every 8 weeks.

      Safely. You could probably speed it up a bit if you have a higher risk tolerance.

          • Megaman_EXE@beehaw.org
            link
            fedilink
            English
            arrow-up
            3
            ·
            6 months ago

            That’s a good point. You couldn’t have someone like Shaq with a 3 foot sword. It would look too tiny! Gotta size it proportionally.

        • Dave@lemmy.nz
          link
          fedilink
          English
          arrow-up
          4
          ·
          6 months ago

          This estimate was for your own blood, not your enemy’s, so probably best not to thoroughly dispatch yourself.

  • HexesofVexes@lemmy.world
    link
    fedilink
    English
    arrow-up
    11
    ·
    edit-2
    6 months ago

    So about 3150 pints of blood (10.5 being average for an adult).

    Sounds doable XD

    Edit: New ethical dilemma just dropped - kill 300 to forge the sword, or deny 3150 people blood in an emergency to forge the sword…

    • sylver_dragon@lemmy.world
      link
      fedilink
      English
      arrow-up
      8
      ·
      6 months ago

      New ethical dilemma just dropped - kill 300 to forge the sword, or deny 3150 people blood in an emergency to forge the sword…

      porque no los dos

    • Jo Miran@lemmy.ml
      link
      fedilink
      English
      arrow-up
      8
      ·
      6 months ago

      New ethical dilemma just dropped - kill 300 to forge the sword, or deny 3150 people blood in an emergency to forge the sword…

    • Allero@lemmy.today
      link
      fedilink
      English
      arrow-up
      1
      ·
      edit-2
      6 months ago

      Here’s the plan: we kill 330 people, save 330 people, the rest is free sword!

      P.S. math may not be perfect

  • galoisghost@aussie.zone
    link
    fedilink
    English
    arrow-up
    6
    ·
    6 months ago

    You know there’s a writer reading this meme somewhere: here; where ever it came from; where ever it will be reposted; and adding it to the story they are working on. Wonder where we’ll come across it first?

  • cosmicrookie@lemmy.world
    link
    fedilink
    English
    arrow-up
    3
    arrow-down
    1
    ·
    edit-2
    6 months ago

    My very rough calculations using 85kg as an average adult weight, results in 153gr of iron

    My problem is, that i dont have any expectations as to how heavy a longsword is but i’d assume it to be a lot heavier!

    After further research it looks like the more appropriate number of humans needed to make an average longsword would be closer to 25.000

    • Dasus@lemmy.world
      link
      fedilink
      English
      arrow-up
      2
      ·
      6 months ago

      Males of average height have about 4 grams of iron in their body, females about 3.5 grams; children will usually have 3 grams or less

      300 * 3g = 900g.

      300 * 4,5g = 1350g

      https://en.m.wikipedia.org/wiki/Longsword

      and weighing approximately 1 to 1.5 kg

      It’s close enough, I’d say. OP’s maths that is.