Thoughts for a bow for my Daughter

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woodie
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Thoughts for a bow for my Daughter

#1 Post by woodie » Sun Jul 05, 2015 8:59 pm

Hi all, I thought I would ask my experienced bowyers a question.
I am going to make my 16 year old a new longbow, so I can get my bow back.
I have 2 thoughts,

40 thou glass 4 0.080" 1 thou tappers 2 bamboo 2 merbau and a 120 thou parallel lam 68" 18" riser.
the other
50 thou glass 2 0.090" 1 thou tappers and 1 0.100" 1 thou tapper.

What I have worked out they both should be around 43#

Thanks woodie
may your arrows fly straight and true and your limbs return.

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greybeard
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Re: Thoughts for a bow for my Daughter

#2 Post by greybeard » Mon Jul 06, 2015 12:22 pm

Hi Woodie,

When measuring all up lamination thickness do you measure the butt thickness and include the glass as per Binghams method or the RCT method as used by John Clark from Ausbow Industries.

Binghams have a draw weight chart in their on line catalogue.

Daryl.
"And you must not stick for a groat or twelvepence more than another man would give, if it be a good bow.
For a good bow twice paid for, is better than an ill bow once broken.
[Ascham]

“If a cluttered desk is a sign of a cluttered mind, of what, then, is an empty desk a sign?” [Einstein]

I am old enough to make my own decisions....Just not young enough to remember what I decided!....

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woodie
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Re: Thoughts for a bow for my Daughter

#3 Post by woodie » Mon Jul 06, 2015 5:50 pm

Daryl I was using the RCT method, I think.
The thickness of the lams at 21" x 2 divide by 10. What I was told if using 40 thou glass subtract 28#, dose that sound right?

woodie
may your arrows fly straight and true and your limbs return.

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greybeard
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Re: Thoughts for a bow for my Daughter

#4 Post by greybeard » Tue Jul 07, 2015 3:15 pm

woodie wrote:Daryl I was using the RCT method, I think.
The thickness of the lams at 21" x 2 divide by 10. What I was told if using 40 thou glass subtract 28#, dose that sound right?woodie
Ron,

I calculate draw weight from the butt thickness so unfortunately I cannot assist you with the RCT.

The following post has the Bingham’s draw weight chart.

http://www.ozbow.net/phpBB3/viewtopic.php?f=34&t=15632

Daryl.
"And you must not stick for a groat or twelvepence more than another man would give, if it be a good bow.
For a good bow twice paid for, is better than an ill bow once broken.
[Ascham]

“If a cluttered desk is a sign of a cluttered mind, of what, then, is an empty desk a sign?” [Einstein]

I am old enough to make my own decisions....Just not young enough to remember what I decided!....

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rodlonq
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Location: Ingham NQ

Re: Thoughts for a bow for my Daughter

#5 Post by rodlonq » Wed Jul 08, 2015 2:53 pm

Woodie,

Is the thickness of your tapers measured at the reference length (i.e. 21" from the butt) or at the butt of the tapers?

Cheers... Rod

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greybeard
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Re: Thoughts for a bow for my Daughter

#6 Post by greybeard » Wed Jul 08, 2015 3:30 pm

greybeard wrote:I calculate draw weight from the butt thickness so unfortunately I cannot assist you with the RCT.
Ron I probably could have explained the above a little better.

I run full length laminations [tapered from the centre] on the back of the bow, so butt thickness would be measured at 35 inches for a 70 inch lamination.

Daryl.
"And you must not stick for a groat or twelvepence more than another man would give, if it be a good bow.
For a good bow twice paid for, is better than an ill bow once broken.
[Ascham]

“If a cluttered desk is a sign of a cluttered mind, of what, then, is an empty desk a sign?” [Einstein]

I am old enough to make my own decisions....Just not young enough to remember what I decided!....

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woodie
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Joined: Sun May 06, 2007 9:10 pm
Location: hunter valley, NSW

Re: Thoughts for a bow for my Daughter

#7 Post by woodie » Wed Jul 08, 2015 5:44 pm

Daryl I think you have told me that is how you do it once before.
Yes Rod I was taking to thickness at 21" from the butt.
I can't work out how the two methods can give me a different end poundage. I have only been using the RCT method and the 3 bows that I have made have worked out close to what I was aiming for.
Ron
may your arrows fly straight and true and your limbs return.

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