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Author Topic: Trapping the back???????  (Read 1736 times)

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Offline beetlebailey1977

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Trapping the back???????
« on: January 12, 2011, 06:04:49 pm »
What does trapping the back of the bow mean?
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Offline Mark Anderson

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Re: Trapping the back???????
« Reply #1 on: January 12, 2011, 06:10:09 pm »
From what I gather you would trap the back in bows that are much stronger in tension than compression like hickory. It means that the cross section would be a trapezoidal shape. the back being slightly narrower than the belly so that there is more wood on the belly to compensate for the compression.
I've never done it so I might be wrong but that is how it has been explained to me.
Mark
p.s. someone with more experience (most on this forum) might chime and explain it better.
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Offline cracker

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Re: Trapping the back???????
« Reply #2 on: January 12, 2011, 06:12:00 pm »
Commadore you hit the nail on the head.
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Offline bigcountry

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Re: Trapping the back???????
« Reply #3 on: January 12, 2011, 09:09:41 pm »
Its great for bows where you worry about the backing overpowering the belly.  I myself did it on my IPE/Boo bow.  As I made a 1.4" wide limb, which looking back is too wide for IPE. 

I have some Black locust staves, I thought about trapping when I build.
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Offline crooketarrow

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Re: Trapping the back???????
« Reply #4 on: January 12, 2011, 09:34:18 pm »
    I've built hickory bows like this. And could'nt see a difference. But was told that unless your bows of high weight 70 to 100 pounds it nos'nt matter that much. Never built a hickory over 65#'s so I don't know if thats true or not.
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Offline Jim Davis

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Re: Trapping the back???????
« Reply #5 on: January 13, 2011, 01:02:47 am »
I usually make the backs of my bows narrower. It does balance the tension and compression forces better. Most woods are much stronger in tension.

Also have made sapling bows taking advantage of the crowned back to have the same effect as the trapazoid design. (I chafe at the cutesy shortcut term "trapping." To me, trapping means catching furbearors for their pelts!)

Jim
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Jim Davis

Kentucky--formerly Maine
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