Re: [SCA-Archery] Crossbows
- At 11:25 AM 1/21/2004, Scott Jaqua wrote:
>I'll donate what little knowledge I have on this topic.An excellent written paper Njall ...
>For a paper on the building of shorter, two fletch bolts, the how and why I
>do it, please check out the following page on my web site.
>Njall Olaf Hagerson
Mind if I make a few comments? (Well, I'm going to make them anyway, so I
hope you don't mind)
>2) Crossbows by definition are center shot. So issues of arrow spine, doActually, they aren't center shot. Or if they are, they are illegal by SCA
>not effect crossbow bolts.
standards. They however, due to their shorter bolt length, shorter draw,
and having a track/guide, simply don't mind spine nearly as much ...
AS LONG AS, there is enough spine to keep the bolt from flexing, at all ...
you want them solid. If someone was to make 28" bolts for their crossbow,
they would start having to worry about spine.
There is also the fact that the stiffness of the shaft increases as you cut
it shorter ... at the shortness that bolts are cut (especially short
bolts), they are extremely 'high spined'
Personally, I always recommend buying the highest weighed spine shafts for
your diameter ... at least a 'goodly spined' group. It never hurts.
>The balance point can be almost anywhere, so long as it is forward of theI've actually found that with many crossbows, the farther forward the
>center of drag.
balance point, the better. Making it become more of a bullet with a
streamer behind it in flight ... I use 165gr tips on my 11/32 :)
>Select the lightest premium grade 5/16 shafts you can find.Just a note that 5/16 doesn't work for all crossbows ... some prefer 11/32
or thicker ... YCMMV (Your Crossbow Mileage May Vary) Plus you can get
heavier points for the 11/32, making potentially even more point heavy bolts.
>If in cutting the point taper, you remove too much wood, toss the shaft inI never recommend throwing any bolts into the trash. Keep them for the
>Don't be afraid to toss any bolts that still fall out of the group.
'over water' shoots, the 'target hidden between 3 rocks' shoots and the 'no
backdrop, just miles of thorns if you miss' shoots. While that little bit
of weight difference may affect getting 6 golds at 30yds as opposed to 3
golds 3reds ... it doesn't matter that much when the target is a foam deer,
and it's better to use the 'bad' bolts that you don't mind loosing.
>However, if you spin the bolt too much you create excess drag. A slow boltTrue ... but I'd personally rather have a very stable, heavy, long bolt
>is much more effected by cross winds and such.
that fires consistantly, than a 'fast' one, that might have other problems.
I always err on the side of stability, which is why I go for longer bolts,
with HEAVY tips, and a good strong fletch angle.
THL Siegfried Sebastian Faust http://crossbows.biz/
Barony of Highland Foorde Baronial Web Minister & Archery Marshal
Kingdom of Atlantia Deputy Kingdom Earl Marshal for Target Archery