Tri-Lam Bow. Why?

[arachnid]

Hi guys!

I`m planning to build an ipe flat bow, backed with white oak (or maybe ash...) and thought- why
no make a tri-lam bow. Then I thought- Why should I make it tri-lam?

So , I have some tri-lam questions:
1) What are the pros and cons of a tri-lam vs. a double lam bow?
2) Assuming I do want a tri-lam- are there any major design differences?
3) What are the  characteristics of a good core wood?

I`ll add that I`m talking about wood in board form- no staves here...

Thanks in advance.

Dor

[DarkSoul]

http://www.primitivearcher.com/smf/index.php?topic=18845.5
http://www.primitivearcher.com/smf/index.php/topic,43255.0.html
http://www.primitivearcher.com/smf/index.php?topic=40725.0
https://www.primitivearcher.com/smf/index.php?topic=7282.10
http://www.primitivearcher.com/smf/index.php?topic=4766.0
http://www.primitivearcher.com/smf/index.php?topic=10892.0
https://www.primitivearcher.com/smf/index.php?topic=43520.0

[arachnid]

WOW!!

Thanks a lot Jorik! I tried to search to forum but for some reason didn`t got
all these results.

Dor

[Wiley]

The search engine on this forum is usually less than adequate for finding old topics here. You will have much more success searching google.

Type this into google search, no need for the quotation marks.
site:primitivearcher.com "whatever your searching for"

[Slackbunny]

When you search, try putting important words or phrases in quotation marks to make your search more specific.

For example if I search the phrase -> bow and arrow - then the search engine will search for any instances of the word bow and the word arrow separately. Any thread that has either of those words in it will show up in the results. And even words that contain those words within them will show up like bowyer or sparrow.  I believe that the search engine automatically filters out words like "and" so you don't need to worry about them.

But if I search the phrase -> "bow and arrow" - then the search engine will return only results with that exact phrase, in that exact order, which would narrow it down quite a bit.

I find that without using quotation marks it is sometimes difficult to get meaningful results on a forum search.

[arachnid]

Thanks guys.

I still haven't found an answer to my third question- what do I look for in a core wood?

[PatM]

Maple.

[bubby]

Why make a trilam, cause you want to maple is good but walnut will looks better

[adb]

I use compression strong core wood, like ipe, Osage, cherry, yellow heart, Purple Heart,  etc. I believe the core is also experiencing mostly compressive forces. The lams I use are thin for the core, often 1/8".

[adb]

The best tri-lam ELB I ever built has a maple back, thin ipe core, and Osage belly. It shoots like a demon at 52#, and took very little set with a slight elliptical tiller. Plus, it looks great with the contrasting dark core.

[toomanyknots]

One reason is it's easy to add perry reflex (glued in reflex) with a trilam.

[toomanyknots]

Maple.

 

[arachnid]

I use compression strong core wood, like ipe, Osage, cherry, yellow heart, Purple Heart,  etc. I believe the core is also experiencing mostly compressive forces. The lams I use are thin for the core, often 1/8".

Isn't that just making the belly thicker, basically? Giving me more material to make a heavier bow or make the limbs thinner?

One more-
 Is there any difference in tillering?

[mikekeswick]

I use compression strong core wood, like ipe, Osage, cherry, yellow heart, Purple Heart,  etc. I believe the core is also experiencing mostly compressive forces. The lams I use are thin for the core, often 1/8".

Isn't that just making the belly thicker, basically? Giving me more material to make a heavier bow or make the limbs thinner?

One more-
 Is there any difference in tillering?

No and no!

Cores experience sheer.
You need a not too dense wood, diffuse porous and has excellent gluing properties.
Maple is the way to go.

[arachnid]

Any other options besides maple and walnut?
Something that may improve performance