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Quad lam - 4 laminations - Why not more?

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Hrothgar:
I don't see any advantage to having additional lams. Howard Hill bows are routinely made with 4 lambs and sometimes up to 6, however.

mikekeswick:
It is pretty much just for looks the way most people make them. However adding extra lams under perry reflex may have some benefits but you have to do 3 glue-ups.
Why on earth would a 4 lam bow by more likely to fail at a glueline??? If you prepare shoddy surfaces and then expect the glue to hold it all together fair enough but if they are well prepared and you follow the way the glue should be used - no problem.
I quite often make quad and more lam longbows. It just starts getting tricky to 'fit them all in'. The best way to do multiple core lams is to taper them all......which can be a pain but does look pretty special!

toomanyknots:
I have been making some reflex deflex bows lately with a good about of bend in the glue ups. I notice when comparing a glue of just a backing to a belly, it will not hold it's reflex too much right out of the form. I mean as soon as I take the bow out of the from the limbs come down a bit loose some reflex. When doing basically the same bow but with 2 belly lams instead of one, it holds it's reflex a lot better right out of the form, and doesn't seem to loose any at all. So might these observations of mine be indicative of added stability/stiffness?

mikekeswick:
No it's just that it takes less force to bend thin lams to the shape of a form than it does a thicker belly lam and a backing. Equal and opposite reaction and all that.
If you don't thin your belly lam when doing a perry reflex glue-up as you remove bellywood the reflex increases....now that's a fun situation.

Dances with squirrels:
It sure does. Mike, you are one of the few I've heard recognize the 'reflex gaining' phenomenon. It can be quite the adventure. The more wood you remove, the more reflex it gains, making the limb appear 'stronger' than the other on the tree, so you scrape off even more.... etc. It hasn't happened to me since I began carefully pretapering my pieces and got a bettet feel for how much material I needed to be closer to final thickness after glue-up.

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