33811Re: [SCA-Archery] Re: Strings newbie help?
- Jul 3, 2013Your rule is simpler than mine. Mine has always been walking through
the following mention formula:
1. B-50 is rated at 50 lbs
2.1 However on an endless loop string, you have half as many at the ends
2.2 On a Flemish string, the 'weave' is only 50% as strong.
3. Therefore, you need to at least double it.
4. Now, multiply by 4 for a safety factor. Because, ummm, yeah. BE SAFE.
So that meant to me: 30# bow? means I need at least 2 strands, so I
make an 8 strand string.
80# combat crossbow? I'd need 4 strands. So I make a 16 strand string.
130# crossbow? I'd need 6 strands, so I make a 24 strand string.
... It's a lot more rough of math, and if I'm close to a limit (50, 100,
150), I'll add an extra bundle of 4. So a 50# bow gets 12 strand, 100#
crossbow gets 20 strand, and 150# crossbow gets 28.
On 7/3/13 3:06 AM, Bill Tait wrote:
> There is also a risk of making the string too thin, resulting in what is
> called a "critical" string. If it is too thin, it will not react the
> same from shot to shot. I played once with different string thicknesses
> and brace heights. The guideline for B-50 (Dacron) is 3-4 lbs (bow
> poundage) per strand. My 30# should have had 8 as a "thin" string. 6 was
> far too few :) It lasted 13 shots before letting go. Thankfully it
> didn't fail catastrophically, but rather the brace height dropped to
> just a few inches.
> PS: A good finger tab will keep your fingers from hurting, and will
> improve your consistency.
> William Arwemakere
> On Tue, Jul 2, 2013 at 11:52 PM, Caterina Fortuna <cat4tuna@...
> <mailto:cat4tuna@...>> wrote:
> My lord has experimented some with modern materials, like certain
> types of fishing line, dacron, fast flight,...
> What this means it's some of his strings are very thin. So thin that
> I requested a thicker serving to keep my fingers from hurting. The
> thicker the bowstring the slower it responds. We check our arrow
> velocity at our local archery shop. This is helpful when tuning your
> Serving (thread) comes in different thicknesses. You can also add an
> extra layer or two in the area where your fingers pull.
> We compromised by making a thin string with a thicker serving where
> my fingers pull.
Barun Siegfried Sebastian Faust, OP - Baron Highland Foorde - Atlantia
http://hf.atlantia.sca.org/ - http://crossbows.biz/ - http://eliw.com/
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