What size Easton Jazz arrow for youth longbows?

[jiane]

I have two little girls who are in need of some new arrows to fling for the summer.  I'm going to "girly" them up for them, but I'm not sure what size they are going to need.  The bows are as follows:

#1 RER youth longbow  58" 11#@20"  (27#@28", if 2#/inch)
#2 Voodoo stick longbow 54" 20#@24" (28#@28", if 2#/inch)

The girls both draw about 20".  I would like to keep the arrows 26" or longer. so that they can shoot them as they grow. Eventually the spine will be too weak, but I'll try to get a few years out of them.  There are other kids that will shoot their bows (including me     ) that will pull 27" or better. So I don't want to be too underspined for them.

From what I can figure out, I'm guessing a 1516 or 1616 size.  I'm thinking that the more common 1716 will be too stiff.

So any recommendations?  Thanks for the help

[Gator1]

I just ordered 1416s Easton jazz from mike at nocking point

My little girl shot 1216s out of a maddog pup

Great shafts with nib points stick in 3 d targets

[Fletcher]

I just fletched up some 1616 Jazz and cut them to 27".  Will be shooting them from a 54", 16 lb Samik.  I'll post how they do.

[jiane]

Thanks Fletcher.  I'm interested to find out.

[tecum-tha]

Assuming 6.5" brace height (which is plenty for kids)an 11#@20" bow will most likely have: (11#/(20-6.5))x (28-6.5)= will most likely have around 18# to 20#@28".
The second bow will be more in the 25#@28" range.
Easton deflections for:
size 1416=1.684" ==>(26/1.684)x1.2115= 18.7 AMO  wood spine@28"
Size 1516=1.403" ==>)(26/1.403)x1.2115 = 22.45 AMO wood spine @28".
Size 1614=1.153" ==>(26/1.153)x1.2115= 27.3 AMO wood spine @28".
Size 1616=1.073" ==>(26/1.073)x1.2115= 29.3 AMO wood spine @28".
For 26" arrows, I would go with the 1416 and for 28" arrows I would go with 1614.
I think you get the idea...

[jiane]

Thanks for the information, much appreciated!!

I'm curious where does the 1.2115 constant come from? I haven't run into that before.  Granted my knowledge of spine calculations is rather limited.

[Fletcher]

I finally took the 1616's to the target and they seem OK.  Probably somewhat stiff, but that is with a Bear Weather rest which moves the arrows out from center a good bit.  I'll probably move it in if I can and see what happens there.  They do fly with a good bit of zip and stick in both the bag and foam targets.

Looking at the chart above, the 1416 may be a better match.  I may try some with my next order.