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Quad lam - 4 laminations - Why not more?

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orangputihkgu:
Hello to you all!  :)

I have seen lots of Tri Lams. Why are there so little Quad Lams?  ???

According to EWBS description a non-historical bow may have up to 4 laminations but somehow this kind of bow is rather a rare species. I can only recall a pictutre of a 4 Laminate made by a member of the EWBS-NZ.

So why are there no more of this kind of warbow? To difficult to make? No real advantage having a fourth lamination? Any difference in performance compared to the Tri Lam?
Did anybody has hands on experience in shooting a Quad?

Any input and information appreciated!!!  : :)

-cheers.......CHRIS

Thesquirrelslinger:
Aside from looks, what would be the benefit of an additional lam?
The back is tension, Belly is compression. The core is shear strength and stiffness.
Making the core 2 lams increases the likelyhood of a delam b/c the glue line is under extreme stress(it is right where the wood wants to shear)
Just my 2 cents, from a person who has never made a laminated bow...

Newindian:
Maybe us bowyers are just lazy

BowSlayer:

--- Quote from: Thesquirrelslinger on July 01, 2013, 01:40:08 am ---Aside from looks, what would be the benefit of an additional lam?
The back is tension, Belly is compression. The core is shear strength and stiffness.
Making the core 2 lams increases the likelyhood of a delam b/c the glue line is under extreme stress(it is right where the wood wants to shear)
Just my 2 cents, from a person who has never made a laminated bow...

--- End quote ---


+1

adb:
Making a quad lam would be no harder than a tri lam. Just slightly more labour intensive. You'd have to make sure your lams weren't too thick, especially the core lams. I often make tri lams, because I can make more bows with less wood. I need less precious belly wood to make a bow. They also look very nice with contrasting woods.

Proper glue lines are not weak. If done correctly, they're stronger than the surrounding wood. I've never had a glue line failure on any bow, including heavy warbows. The wood itself always fails first. You'd also have to watch that your limb's physical weight didn't get too high using dense core layers. I don't believe there is any advantage to making a quad lam over a tri lam.

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