[SCA-AE] RE: looking for some combat archers that shot at pennsic

[Taranach]

I thank you for the information your majesty,

Shortly after writing that missive I was studying the ASTM 
specifications for the different sizes and discovered the lengthwise 
compression/ extension ratio... as well as the weight per linear foot.

I suspected that the lesser compressability and greater weight (mass) 
might have been the reason especially considering the energy transfer it 
would have at the velocities generated by a crossbow.

I thank you for the confirmation and explanations. The CA website has 
been a wonderful source of information, when it decides to cooperate 
<G>, and the instructions for making CA arrows are fantastic.

Thank you again for all of your efforts!

Taranach

Tessa wrote:
> Nope, it's still official.  I'm the one who had the page made, tweaked it,
> etc.. :)
> 
> What you don't know, since you aren't an active combat archery marshal
> and/or weren't there when this testing/approval was made (smile).. is this:
> 
> We use Siloflex and it's equilavents for APD's (anti-penetration devices)
> and for bolts and arrows.  It was much more confusing to seperate
> everything.  We tried making that page several different ways.  The rules
> clearly state 100 psi Siloflex (the equilavent to that is any of the 100 psi
> Polyethylene Piping).  The rest of the equivalents are for the APD's.  We
> had a number of people in Canada who couldn't get the same Polyethylene
> piping that we could in the states, so we had to get samples of what they
> could get and conduct testing to make certain it was safe.
> 
> That's also why it says x.. is approved for making APDs.. since only the 100
> psi is good for arrows or bolts.  There are several different psi's that are
> fine for APD's (since they serve a different function).
> 
> A good rule of thumb, if someone wants to make combat archery arrows/bolts
> is to double check with someone experienced with making them.  I know I'm
> always happy to help, just as our Kingdom deputy for CA, Ce'tach is, too.
> :)
> 
> Something that may help.. 100 and 160 psi are not the same thing.. that's
> the pressure rating.  So, where 80 psi isn't that far from 100 psi.. 160 psi
> is much stiffer, thicker, etc.. it's much stronger, which isn't always a
> good thing, especially when shot from a crossbow.
> 
> I hope that helps explain things a bit better.
> 
> Tessa, Regina (former Society Combat archery marshal) grin..
> 
> 
> 
> Except that the Siloflex equivalency rules allow other materials to be the
> equivalent of either 100 psi or 160 psi Siloflex -- so why allow equivalent
> materials at that psi but not siloflex itself? (from
> <http://www.sca.org/officers/marshal/combat/archery/siloflex_equivalent.pdf)
> Siloflex Equivalents 1. Be manufactured to ASTM D2239 or ASTM D2737
> Standards. 2. Be manufactured from PE3408 3. Be sized as 1" ID if D2239, or
> 1-1/4" OD if D2737 4. Have a SIDR rating of 15 or lower (typically 100PSI or
> heavier pipe) or have a SODR rating of 17 or lower (typically 100PSI or
> heavier pipe) 5. Must be 100, 160 or 200 psi These guidelines will allow
> pipe to be used from a variety of manufacters... Is this document no/no
> longer official, or has something else changed? toodles, margaret
> 
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