Shooting a 386 lb Great Yew Crossbow
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- čas přidán 27. 08. 2024
- Great Yew Crossbow based on a Munich original from the 14th/15th century. Its bow-length and its cross-sectional area of the limbs are identical with the original.
The main question was - how will such a bow work?
Todd was right. This is an interesting channel.
cannot agree more!
could you link me in which video he mentions this channel?
@@REALdavidmiscarriage One from 11 months ago.
Really terrific work. Over the last ten years or so, we are really learning more about the medieval crossbow. Thanks for your work, and please keep sharing it.
Can you do more testing with this crossbow? Would be very interesting to see it speed shooting and test it on chainmail. Greetings from Sweden 🇸🇪
At this moment I work on a historical spannig bench so I am able to do some tests in the future....
I’m planning to do this on my Chinese crossbow. What dimensions do you recommend for a 300lb@32” prod? How is 7feet long hickory same width as yours ?
Unfortunately, I have no experience with hickory. My yew bow is 5.25 feet long. The middle section measures 3.35 x 1.73 inch.
@@medievalcrossbows7621 if you use yew what dimension would you estimate for 300 lb@32” crossbow
@@medievalcrossbows7621 the size is more like ballista
@@HistoricalWeapons depending from the quality of the wood - I would start with nearly 8 inch and a cross section like above - the rest is the tiller process....
@@medievalcrossbows7621 thanks
What an enormous piece of yew!
That's a weird looking cranequin you got there, sir. 😁
Why not using a large lever (goat or gaff) to pull the string?
Aim about to make a crossbow outov trailer suspencion limb
I did that. Styled it after a 16th century spanish sporting bow. 260 lbs at 7.5 inches. Very fun
Do you think you could span this with hand and feet or belt hook/Gürtelhaken?
Knottelarmbrüste turn up quite often in inventories and I wonder if those were bows of this dimension and spanned by hand or smaller ones.
I don't think so, because 180 kg are to much. For this great one you'll need a spanning bench or a "Spannbock"
It depends on how strong the man is
Was this piece of yew naturally (or artificially) deflexed or did it start as a straight stave and bent later from stress?
It starts as a straight stave.....
I see. Would there possibly be any benefits to an intentionally deflexed construction, despite having a lower dry fire speed and lower energy storage, or is it always a compromise to make things functional? There are examples of such bows in Africa and also steel bows in Europe and some wooden bows in museums seem to me like they couldn't possibly start straight (if they are authentic pieces at all). But maybe it's just my lack of experience working in such thick dimensions.
@@treelore7266 In this case the challenge was to build a reconstruction of an existing example. But you are right - a deflex bow doensn't wor as well as a straigt or a reflex bow. In my case all my wooden bows got a set ;-)
@@medievalcrossbows7621 Yeah, mine too, even when they are less than 2.5cm thick! At that thickness I already begin to get compression failures in pin knots, that's why bending something so massive seems incredible to me.
What was this used for? Hunting, war, or soemthing else? It seems a bit big for the field...
It was used for the defence of a city
what would such a crossbow be used for? infantry, static defence, siege?
its main application was static defence and siege because you need a powerful spannig device
Is there historical evidence for adding the winding's where you had the crack? I ask as I do not know a lot about crossbows.
In my opinion yes - the work with sienews was very popular in medieval times.
Fantastic video!! I have a couple of questions, just in case you know it.
Did you find a maximum strength for a crossbow with it´s bow made of wood that can be used in a battle? I mean not in a siege (this seems to be a good weapon for a siege).
What is the relation of power between a bow and a crossbow? Does it varies with the kind of bow of the crossbow (wood, composite and steel)?
Thanks a lot and, please, keep on with these wonderful and instructive videos!
That bow would not break so easily if it was strung higher to the historically correct middle of bolt-track brace height.
Then the string tension would be pushing more against the wood grain instead of trying to force a split in the wood. The string tension force at brace height would also be lower due the less sharp string to limb tip angle.
As a bonus there would far less friction between the string and bolt table so input/output energy efficiency would improve.
And the proportional speed of limb tip to bolt speed would decrease meaning reduced inertia momentum for bow limbs . This will allow much lighter bolts to be launched with much better energy efficiency, resulting with considerably faster bolt speeds.
And, most importantly for a historical reconstruction, it would be historically correct.
Since every single period illustration shows crossbows strung to 50/50 brace-height/power-stroke ratio.
This was done for several good reasons.- A few of which are listed above.
The one drawback I could see here would be the stress of the bow when strung. Even if it was steamed into shape, there would certainly still be a degree of weakening in the bow
it will have less powerstroke however
What is the powerstroke for this crossbow? Why did the Medieval people make the prod so long relative to the powerstroke? Even longbows are 170 cm.
Distance between bow and nut: 425mm.To your second question - perhaps for more safty.....
@@medievalcrossbows7621 Thank you for answering. Would the velocity of the quarrel increase if they kept the bowlength and draw weight the same while lengthening the powerstroke, due to the decreased weight of the prod?
@@peasantmob1712 a good question - it could be possible
@@medievalcrossbows7621 Thank you for answering again. Sorry if I sound pushy, one last question: Do you have the cross-sectional dimensions of the crossbow limbs? It seems really large despite the relatively low draw weight compared to your other crossbows.
@@peasantmob1712 in the middle section: 85x44mm
near the string notch: 62x28mm
If you don’t mind what’s the power stroke and length of the tiller
isnt this bow relatively weak? Why is that?
How I said - its a reproduction from an existing original
Hallo Herr Bichler,
welchen Winkel hat der Armbrustbogen zum "Armbrustkorpus"?
Und ist der Winkel einzigartig oder nimmt man diesen bei jeder Armbrust?
Der Winkel wird immer individuell abgestimmt. Er ist dabei von verschiedensten Faktoren abhängig ( zB der Bogenhöhe, der Bogengeometrie, dem Stand der aufgelegten Sehne, der Höhe der Säulengabel, dem Abstand zwischen Bogen und Nussachse).
@@medievalcrossbows7621 gibt es ein bestimmtes Buch/bestimmte Journal-Ausgabe die das genau beschreibt?
@@arturleperoke3205 Es gibt einen Artikel für Sahlbögen von Erhard Franken-Stellamans: "Formgebung und Positionierung von Stahlbögen für Armbruste". in: Jahrblatt der Interessengemeinschaft Historische Armbrust 2008. Groß_Gerau 2008, S. 56f.
Franken-Stellamans wählt dabei den Schränkungswinkel des Bogens so, dass die Bogensehne über ihren gesamten Sehnenweg die Bolzenbahn berührt, wodurch er einem Sehnen(über)schlag entgegenwirkt.
Is this more powerful than a longbow or mongolian composite bow?
Not yet - the problems are the short power stroke and the weight of the bow. But a direct comparison isn't possible because nowbody is able to draw 180kg by hand
Wie stark wäre der Bogen wohl wenn er aus Haselnuss bestünde?? Eibe in der Dimension ist sehr teuer,oder??
Ich habe für einen halben Eibenstamm etwa 100,- bezahlt. Haselnuss in der Stärke dürfte schwierig zu bekommen sein.....
@@medievalcrossbows7621 100€?! Interessant, danke. Haselnuss in der stärke wächst in meinem Wald. Währe Haselnuss in den Dimensionen wie bei deinem Bogen brauchbar?? Mfg
@@guntherhuemer1767 gute Frage, der Durchmesser sollte jedenfalls bei 15 bis 20cm liegen, damit man den notwendigen Querschnitt heraus bringt....
Das Original/Vorbild stammt aus München?
Ja genau - aus dem Stadtmuseum
Would you be able to tell me where the original this is based on is stored?
In the Townmuseum of Munich
What’s the power stroke?
approx. 330mm
108 J is nice for a 380lb xbow. Likely b/c it's Yew instead of having steel prods, as well as having a longer power stroke over smaller xbows.
That's about the power of a 120lb Yew Warbow. But the bolt is much heavier so the momentum would be higher, but the range is lower (the trade-off).
But a comparable weapon without needing the strength to pull a heavy bow :)
czcams.com/video/5VMc8YDsnWI/video.html
ja, mit 39 m/s doch ein bißchen enttäuschend. Ein Bogen mit der Geschwindigkeit wäre ja nur zu Spiel- und Dekozwecken verwendbar.
Bolzengewicht beachten!
It should be possible to span this crossbow by foot, lying down on the floor. Did any of you try that?
No, because 180kg are to much for us ;-)
Try making a Springald?
👍👍👍
Only 39 lbs
no - 389 lbs or 175kg.....
Medieval crossbow and not medieval awful music, lol