## Building arrows

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• After messing up my last attempt at building arrows I thought I d get some advice for this next batch. I m building arrows for my 30# bow with 5/16 shafts
Message 1 of 5 , Oct 31, 2005
After messing up my last attempt at building arrows I thought I'd get
some advice for this next batch. I'm building arrows for my 30# bow
with 5/16 shafts spine to 30#. Is there a "rule of thumb" for
deciding on what grain of points to use?
• ... Depends on your knocks and the fletching. The only rule of thumb I know has to do with the balance point. The arrow should balance 9% of the total length
Message 2 of 5 , Oct 31, 2005
jon wrote:

>After messing up my last attempt at building arrows I thought I'd get
>some advice for this next batch. I'm building arrows for my 30# bow
>with 5/16 shafts spine to 30#. Is there a "rule of thumb" for
>deciding on what grain of points to use?
>
>
>
Depends on your knocks and the fletching. The only rule of thumb I know
has to do with the balance point. The arrow should balance 9% of the
total length of the arrow, in front of the center point (plus or minus
1%). So prepare a shaft by dipping and cresting it as you plan to. Then
fletch it up without a point. Then try several arrowheads on with a
press fit and check the balance point. For a 30" arrow, you are looking
at 2.7" or so, in front of the center point (figure a little less to
allow for you point glue, but not much!). Find the arrowhead weight that
gives you that balance point and you should be set.

Njall
• Well the FOC as was mentioned is one important issue but as well there is what is known as effective spine to consider, the heavier the point the lower your
Message 3 of 5 , Oct 31, 2005
Well the FOC as was mentioned is one important issue but as well there is
what is known as "effective spine" to consider, the heavier the point the
lower your effective spine will be. Most of the time I design arrows to work
well with a 100 grain arrowhead. If they play stiff I try a 125. if I have
to adjust more than that I have not done my job right.

Effective spine is basically how the spine of the arrow actually works off
the bow, regardless of the actual spine of the shaft. It takes into
account:
arrow length, draw weight, point weight, actual spine, arrow mass, how
centererd the shelf is to the cl of the bow, all the other force vectors
that that incures etc.

What you need to do is to first know your draw length, the weight of the
draw at your draw length, the kind of bow( recurve, longbow, centershot or
not) all this tells you something and makes the arrows behave differently.

Most of the time I don't spine an arrow at the weight of the bow. Wont work
well. So come back at me with these questions ansered and I can get you
about right on with the spine of arrows and point weight. It is what I do
for a living so ask away.

Ragi

www.shoppe.brokenaxe.ca

-----Original Message-----
From: SCA-Archery@yahoogroups.com [mailto:SCA-Archery@yahoogroups.com] On
Behalf Of jon
Sent: Monday, October 31, 2005 7:24 PM
To: SCA-Archery@yahoogroups.com
Subject: [SCA-Archery] Building arrows

After messing up my last attempt at building arrows I thought I'd get
some advice for this next batch. I'm building arrows for my 30# bow
with 5/16 shafts spine to 30#. Is there a "rule of thumb" for
deciding on what grain of points to use?
• What Kind of 30# bow. It does make a difference! Like on a D section English longbow you need a lot more feather to make it work better. The rule of thumb
Message 4 of 5 , Oct 31, 2005
What Kind of 30# bow. It does make a difference! Like on a "D" section
English longbow you need a lot more feather to make it work better.

The rule of thumb is enough to make the arrow ballanced XX% tip heavy its
35-38% for bolts... I cannot remember what the balance is for arrows but it
is a little less.

James Cunningham
----- Original Message -----
From: "jon" <ziggy2c@...>
To: <SCA-Archery@yahoogroups.com>
Sent: Monday, October 31, 2005 7:24 PM
Subject: [SCA-Archery] Building arrows

> After messing up my last attempt at building arrows I thought I'd get
> some advice for this next batch. I'm building arrows for my 30# bow
> with 5/16 shafts spine to 30#. Is there a "rule of thumb" for
> deciding on what grain of points to use?
>
>
>
>
>
>
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• Building arrows You forgot and shoots well The final test is at the butts!! Find the arrowhead weight that gives you that balance point and you should be
Message 5 of 5 , Oct 31, 2005
Building arrows

You forgot and "shoots well" The final test is at the butts!!