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Author Topic: Backwards Pyramid Bow  (Read 13011 times)

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GraemeK

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Backwards Pyramid Bow
« on: November 25, 2008, 02:53:17 am »
Hi All

Have for quite a while thought we might be using the bamboo on laminated wood bows the wrong way around so I decided to give it a go the other way . I realised that people were going to say it was back to front so I built it as a backwards bow.
It seems to prove that bamboo as a belly and Osage as the back works fine -- the bow has taken no set which has always been a problem the other way around.
The bow is 68" ntn and 48# @ 28"

Graeme

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GraemeK

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Re: Backwards Pyramid Bow
« Reply #1 on: November 25, 2008, 02:54:39 am »
Couple of extra photos

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Offline DanaM

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Re: Backwards Pyramid Bow
« Reply #2 on: November 25, 2008, 06:40:40 am »
Way to think out of the box :) Curious to see how this works in the long run.
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Offline El Destructo

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Re: Backwards Pyramid Bow
« Reply #3 on: November 25, 2008, 07:45:21 am »
Me too....I tried a Backwards Hedge Bow once.....and the Handle Popped Off!!!

Nice Bow Graeme..........and please keep Us posted.....this will be most intereting to keep tabs on.....and watch it break-in
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Offline adb

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Re: Backwards Pyramid Bow
« Reply #4 on: November 25, 2008, 09:43:24 am »
Ooooo... that just looks so backwards, doesn't it? Can't argue with results, however. Way to think outside the box! Nice tiller.
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a finnish native

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Re: Backwards Pyramid Bow
« Reply #5 on: November 25, 2008, 10:08:37 am »
very interesting, and good looking. When it takes set, string it the other way around, and so on :D Nice workmanship.
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Offline JBL

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Re: Backwards Pyramid Bow
« Reply #6 on: November 25, 2008, 12:22:18 pm »
That is a neat idea.  The bow looks really cool.  I love the osage and boo combo.
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Offline OldBow

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Re: Backwards Pyramid Bow
« Reply #7 on: November 25, 2008, 12:26:42 pm »
If that doesn't beat all.  Good for you for thinking outside of the box.  Looking forward to seeing how this one stacks >:D up for November Laminate Bow of the Month.
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Offline Ryano

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Re: Backwards Pyramid Bow
« Reply #8 on: November 25, 2008, 12:30:29 pm »
Interesting. Did you temper the boo ? My brother and a few other guys have been making tri-lam boo backed and bellied bows for quite a while now with good success. So I guess its no suprise it works but I still think you'd be better off with the boo on the back. Bamboo isn't all that great in compression but its extremely tough in tension. Tempering the bamboo will help its compression property's though.  ;)
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Offline Pat B

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Re: Backwards Pyramid Bow
« Reply #9 on: November 25, 2008, 12:58:50 pm »
Interesting Idea.    Pat
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Offline JackCrafty

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Re: Backwards Pyramid Bow
« Reply #10 on: November 25, 2008, 01:05:34 pm »
COOL 8)
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Offline Gordon

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Re: Backwards Pyramid Bow
« Reply #11 on: November 25, 2008, 01:31:08 pm »
Now that's different. I assume you pre-tillered that Osage slat before glue-up?
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Gordon

Bowbound

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Re: Backwards Pyramid Bow
« Reply #12 on: November 25, 2008, 01:31:29 pm »
Can you string it the other way too ;) ;)

Looks great.
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Offline Okie

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Re: Backwards Pyramid Bow
« Reply #13 on: November 25, 2008, 02:36:04 pm »
Cool looking bow... Are you sure you didn't just glue the tip overlays on the wrong side? >:D ;)

John
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GraemeK

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Re: Backwards Pyramid Bow
« Reply #14 on: November 25, 2008, 05:21:39 pm »
Hi Guys
Its true that boo is not as strong in compression as tension but this is the same for most woods. I finally found some decent test data for boo that was done on wall sections not whole sticks and the result is that boo is as good in compression as most  woods so I figured it was worth a try since the boo is so much stronger in tension than almost all woods that I get heaps of set unless I trap the back. So far I have no set and the bow is quite fast -- shoot 175 fps out of my shooting machine drawn 26 1/4" from the rear of the handle with 10 grains per pound.

The way I made it was to tiller the boo then glue on a osage slat about 3/16" with a taper to glue up the handle slope then re tiller the back which works fine since the osage has the grain on edge.

Graeme
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