The beginning of the video shows an antique pavise with some damage from crossbow bolt heads, then they show some examples of how the replica was made in various layers of I am not sure what, then they shot it twice and compared the damage to the original.Ĩ1.3 grams, 358 mm / 14" long (speed 69.3 m/s) penetrated 32mm (1.2 inches)Ĩ1.1 g, 359 mm long (speed 69.85 m/s) penetrated 32mm (and lost a feather) Here is another very interesting test from the same people, using a smaller (but also 1200 lb draw) crossbow, spanned by a cranequin, targeting pavise shields. Posted: Thu 20 Sep, 2018 2:27 pm Post subject: Maybe some of our German speakers on the thread could find out more about this test.īooks and games on Medieval Europe Codex IntegrumĬodex Guide to the Medieval Baltic Now available in print Looks like he published a book or a paper or something, here: I don't think even this guy has quite figured it all out yet but he is clearly much closer to the reported medieval performance than in some of the older tests I've seen with composite prods where the prods seemed to fail after just a few shots and they had very poor performance. He's saying that weapon has a 'potential energy of over 1200 joules, though I don't know what that is based on. Here is another test with another 579 kg draw (1280 lbs) composite-prod crossbow, 150 cm prod length, where shooting some very heavy bolts they got 57.7 fps with a 260 gram bolt for 433 joules (see 01:26), and 348 gram bolt for 488 joules (01:33). Posted: Mon 05 Dec, 2016 7:39 am Post subject:įorgive me if someone already posted this You wouldn’t want to be doubly burdened with a shield and a crossbow as big as those Italian ones. It might also explain something that struck me as odd: the fact that – so I have read - many Italian crossbowmen kept their pavise bearers as separate troop units, whereas Western Europeans depict their crossbowmen apparently carrying all of it themselves. If their tradition is old and reliable, those things were bigger than typical Western reconstructions I have seen. Sizewise, they are more in line with this painting: Look at this video of a medieval crossbow procession from Maremma in Tuscany: There is no evidence that the bows were recurved as far as I can see.Īnother considration is that we are only reconstructing a subset of bows – and not the most powerful. Unfortunately, if you do a google seach, there are many crossbows that are either unstrung or whose string has gone slack. That might make differential treatment of steel in a prod an unnecessary complication. I was more concerned with the fact that if that doesn’t change from steel to steel, then you probably wouldn’t get the compression/tension resistance differences between hard and soft steel either. Yes, I am aware that the modulus of elasticity is not the only thing that counts in a composite. Posted: Mon 02 Feb, 2015 12:25 pm Post subject: "In addition to being efficient, all pole arms were quite nice to look at." - Cherney Berg, A hideous history of weapons, Collier 1963. A lot of reflex will give a lot more stored energy for the same draw weight and draw length. What might we be missing with steel prods? Are they reflexed? If not, why not? I don't recall seeing an old unstrung steel prod, or contemporary artwork of one. Plenty of woods have much higher elastic moduli than yew (e.g., double), but yew copes better with strain. The importance of maximum strain versus elastic modulus is clear when you look at what makes good bow woods. Both the horn and sinew will withstand much higher strains than wood. The horn is pre-strained when the bow is strung, but the same applies to a wooden self-bow. The sinew backing is pre-strained by the shrinkage as the backing dries, and when the bow is strung, it's even more pre-strained (just compare the unstrung reflexed shape with the strung shape). The key point of the composite bow isn't that the sinew and horn have a higher elastic modulus than wood (sinew has a much lower elastic modulus than wood, and horn is about double that of, say, yew), but that they can survive much larger strains. Posted: Mon 02 Feb, 2015 2:07 am Post subject:
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