960lbs crossbow vs 150lbs crossbow - TESTED!

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Published 2021-01-24
In medieval times crossbows with 1000lbs draw weights were pretty normal; but how powerful were they compared with modern crossbows?

Here I test a 960lbs medieval windlass crossbow and a 150lbs modern compound crossbow, side by side and compare the two and why they perform so differently.

Medieval windlass crossbow by todsworkshop.com/collections/historical-crossbows

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Medieval bow 67g bolt
Draw weight Bolt weight Speed Energy Momentum
435kg. 67g 56m/s. 104J 3.7 Kg.m/s
960lbs. 1034 grains 182fps. 77 ft.lbs. 26.8 lbs.ft/s

Medieval bow 90g bolt
Draw weight Bolt weight Speed Energy Momentum
435kg. 90g 51m/s. 117J 4.6 Kg.m/s
960lbs. 1389 grains 167fps. 86 ft.lbs. 33.3 lbs.ft/s

Modern bow 23g bolt
Draw weight Bolt weight Speed Energy Momentum
68kg. 23g 110m/s. 139J 2.5 Kg.m/s
150lbs. 355 grains 361fps. 103 ft.lbs. 18.1 lbs.ft/s

The numbers below are from the "Lockdown Longbow" using medieval longbow arrows, shooting at the same speeds as that from a 160lbs longbow    • Lockdown Longbow - Now I have WAR ARR...  

TYPE SPEED MASS MOMENTUM ENERGY

7 54m/s 94g 5.1 kgm/s 137J
9 55 m/s 85g 4.7 kgm/s 129J
M2 59 m/s 73g 4.3 kgm/s 127J
16 63 m/s 68g 4.3 kgm/s 135J


Edited by Greg Bright

All Comments (21)
  • @nerine4188
    Man, Tod is really strong. Being able to lift 960 pounds is not a small feat.
  • Momentum really defines the amount of damage, and so does the shape and material of the tip. A heavy arrow with a hardened steel tip has so much more penetration than a soft lead bullet, even at a fraction of the speed. It is the effective range that makes a difference. Muscle operated weapons never really exceed 150 m/s, in most cases they are at about half that. So the effective range for aimed shots is about 50 to 100 meters, anything beyond that requires so much hold over that it is more like random. Targets within that range are in mortal danger though. Guns can easily exceed 150 m/s, so they can be effective for looooong distances.
  • @ericv7720
    The sound those heavy crossbows made must have made quite a psychological impact, especially when you had hundreds of those firing a volley!
  • @user-xu1vj3rs4d
    Replace the medieval steel bow part with a high density carbon fibre made one, also in the 900 pounds range. That will make the inertia problem many times smaller and the arrow speeds will go up accordingly. Crossbow balance will benefit at the same time. I'd really like to see that experiment done! Thanks for your marvelous videos!
  • @jbitt1617
    Why does his jacket look 500 years older than the medieval crossbow
  • @Menuki
    I’d be really curious to see 500lb draw on a modern compound bow system
  • @diverd8347
    Video Idea: What if you combined the two, could you use modern technology to build a 1000lb composite compound crossbow.
  • @SeanFication
    It would have been nice to see a comparison of the penetration abilities of these two bows, in terms of going through X inches of wood or metal. It looked like the older bow would have been the more deadly weapon on a medieval battle-field.
  • @tartarsauce2601
    I'd like to see a medieval crossbow made out of modern materials like Polymers and carbon fiber, with lighter arrows.
  • @Qilue
    9:43 There is an old saying, to train a longbowman, begin with his grandfather. Longbows as a weapon of war were made obsolete by the ease of training men to use crossbows and muskets.
  • @babelbabel2419
    Tod's video are always thoughtful and meticulous. And he's such a calm and nice guy. Great job!
  • The ringing you hear is because the wood acts like an amplifier for the vibrations in the weapon. When you cock the crossbow up, a lot of energy gets stored in the wood itself.
  • @RamadaArtist
    "You might walk away wondering why anyone would ever want to shoot a crossbow" Because it takes two weeks to train someone to use a crossbow, instead of the 20 years you need to be a successful longbow archer.
  • @MonteKowalsky
    Tod always gives me such strong “if you love what you do, you’ll never work a day in your life” vibes
  • @TheHarryChase
    Absolutely brilliant comparison! I am hunting this year with a crossbow for the first time. I have wondered how the two technologies compare. Thank you for bringing this to light!
  • @Trencher1375
    Easy to learn, easy to shoot, penetrate armour and great range. The advantages of crossbows instead of bow are many.
  • @Skallagrim
    This is a great demonstration and comparison! You explained the difference in efficiency between medieval and modern crossbows in a clear and easy to understand way. I definitely appreciate the relative lack of maintenance on modern crossbows compared to how much you have to keep up with a medieval one. Oddly enough I've found that modern crossbows with light carbon fiber bolts just annihilate a gambeson and riveted mail, where a medieval crossbow bolt (depending on the draw weight and shape of the point of course) may not penetrate as far or even bounce off. Can't beat the old designs in style though. :)
  • @skippy2987
    What I learnt from this: I want a medieval 900lb crossbow with a compound mechanism
  • @Goshin65
    You sir, are nothing short of amazing. I've never seen anyone else so thorough and precise with such tests and gear.
  • @philflip1963
    Well done for explaining these issues, there are plenty of videos on bows but yours is the first to go into these matters.