Stacking 3.0: Cracking The Code Of How Siyah Work!

Important discovery and realization of how siyahs actually work. As well as how they are related to stacking. If you're interested in the actual chart that proves the importance of 48° and 66°, please use the link below.

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[gizmonomono]

I was not expecting another one. You're like a mad scientist 😁
Awesome work!

[maxwunderlich]

Thanks, that's very useful. I think you're friends is right in regards to the material losing it's ability to withstand stress before it fails completely. However I believe the reason why we might not notice this in a bow is because the bow limb is exposed to tension on the back and compression on the belly, when on of the sides starts to weaken only slightly the other sides stress level increases dramatically and the bow limb breaks more rapidly, because the bow is not one piece of homogeneous material. I hope it makes sense.

[gordonallison]

This and the last are excellent. I think you are dead right with sine and cosine vector components. The work on 60° being important is very revealing. Thankyou for your work

[seb]

Great chanel, very interesting content ! Thanks a lot for sharing these reflections and knowledge !

[scramjet]

Bows are made from polymer bonds. The yield is true more for materials like metal, where there are metallic bonds and the structure is crystalline as compared to a polymer polymer bond.

After exceeding the max yilding force the metal crystals would start to deform. But in pulymers like wood, sinue etc. Its like strands of molecules which when break, dont attach to nearby molecules like atoms of metals would. So i think thats why it snaps immediately.

[naenjamal]

i believe 4.0 is on the way, great explaination.

[Couponuser]

This is an awesome video series, and a great channel! Keep up the great work! I'd be very curious about learning more about string bridges and if you would be able to make a bow with non-string contact siyahs like a Magyar/Changshao/ general "Hunnic" design an improved design by adding string bridges (and potentially lengthening the string to maintain the same brace height and therefore power stroke).

[wakembun]

i experienced an incident broken bow. My oponion, it depends on material. If syntethic material it will suddenly failure. If natural material it will yielding and rupture.

[galeosolsolutions]

Hy,
cool video. I'm running tests with a similar topic. One thing you might consider for your next video is the ratio betwen the limb and the stiff leaver. There has to be a sweetspot with a surtain ratio betwen limb and leaver. Based on the laws oft leverage.
;-)

[robinj]

Really impressive work. Had to re-watch certain parts to get the point. Have you made any FD curves and mapped out the 48, 60 and 66 degree points to see any correlation?

[ArminHirmer]

You tested laminated bows only I guess and Ivar relates to composite bows with horn and sinew. could make a difference, but what do I know :)

[DogsaladSalad]

have you read the traditional bowyers bible? if you havent, i think it would be a very good book for you.

[JonWickkk-cniv]

Interesting: I had one asian bow in my collection. It was some Short Kaya Korean bow (I forgot model) I know my technique is decent drawing like english longbow (but with thumb instead of fingers). The kaya bow shot fast but it made my back muscles very tight, with knots and sore because of stacking (uncomfortable to me). I ended up giving the kaya away. I never have that muscle tightness sensation with my long bow (same draw weight, but smoother draw). Do archery muscles respond differently to stacking?

[CharlsonCKim]

seems the failures you have experienced are not material failure but joint failures.

[peterxyz]

👍🏼👍🏼👍🏼 you are a scholar!!! 👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼❤️

Great series!

[yusdirman]

i've tried this to find the limb length for 60 degree string angle and end up with a quadratic equation, law of cosine etc..🥲