Arrow Size - Confused

[JohnKR]

OK, this is my first question on the forum, it may be that I am missing something obvious, but I need clarification.

X7 arrows. The Easton shaft selector puts a 30” arrow at 30-35 lb. into the T6 group, 36-40 lb. T7 group.
T6 recommends sizes of 2112, and 2014.
T7 recommends sizes of 2212, and 2114
The shaft selector downloaded from Easton confirms this.

Simple up to now, but then….
the Quicks catalogue at the bottom of PAGE 87 gives a selection chart for aluminium arrows, including X7. For 30” the chart gives a size of 1916 from 30-45 lb.
I have the book “Archery – Steps to Success” this has a chart that also states 1916 but only 30-40 lb.

I am confused, can someone explain this, or is it a mistake?

John.

[Jerry Tee]

The chart on page 87 is a waste of space and I don't go much on the charts either because every single entry assumes a standard point weight. the trouble is that at some spine rates or sizes you can have low or high point weights but the chart takes no account of that. I prefer to use the downable shaft selector from the Easton web sight. If you use the target section you can find out the weight is used from the weight calculation. If you are after ally arrows the use the hunting selector and you can put in your own point weights and see how that affects the selection process.
Add to that the difference in limbs a cheap slow set of limbs as opposed to an expensive carbon and foam fast set of limbs, They will require different spine arrows even though the they have the same draw weight.
As an idication of this, down load the Easton selector from the down load and check the difference in arrows required by hard and soft cam compounds a similar difference will be required between fast and slow limbs.

[pwiles1968]

When Using the Arrow Shaft Selector Program be a little careful with the Hunting Shafts Page. It tends to err on the stiff side on Shafts for hunting, this is not such an issue for compounds with release aids, but I am guessing it will cause recurve archers some issues.

I am not sure why this is one thought is that Hunters use screw in points which require RPS inserts this adds weight to front of the shaft effectively softening them up.

Either way just keep an eye on the spine on the hunting Page.

[Quadratus]

Be very careful of any chart, or you can make an expensive mistake.

Differences in efficiency between bows which look the same on paper can be huge and make even the best chart a lottery. Then there is the archer to take account of. The archer's technique, particularly their loose, has far more effect on tuning than is usually assumed.

My suggestion for choosing arrows is:

1. First and by far the best, borrow what seem likely to be suitable arrows to try. This way, with a bit of luck, you cut out all the guesswork.
   
2. Failing this, shoot the nearest thing you can find to a tuned arrow, calculate or measure its speed, and use Archer's Advantage, or similar to calculate the right spine. This method is pretty foolproof.
   
3. Next best, and a long way down the list, base your choice on what other archers with as near the same kit, draw etc as possible to your own use.
4. Finally, and only if all else fails, use the charts, remembering that stiff arrows are a nuisance, but weak arrows are a disaster.
   
5. Treat advice from suppliers with great caution. A bit harsh maybe, but I can count on the fingers of one foot how often I have come across newcomers who have been sold the right arrows by any retailer you can name.

Hope this helps.

[dino1300]

What might help is this :

http://www.eastonarchery.com/product...hartsSelectors

You need to understand that XX75 aluminium is a bit softer than X7's, so the X7 will be stiffer for any given size.

The X7 does not come with a 0.016 wall, so you need to get a XX75 for a 1916.

The diameter of the shaft has a much higher influence on the stiffness of the arrow than the wall thickness. Hence a 1916 XX75 is only 0.035" stiffer than a 1914 X7, but a 2014 X7 is 0.079" stiffer than a 1914 X7.

So with ally arrows there is always the trade off between speed from a lighter arrow, and strength from a thicker arrow wall.

If in doubt, always go for the slightly stiffer shaft. In this case probably a 2014.

[rohenwto]

Originally Posted by Jerry Tee

I prefer to use the downable shaft selector from the Easton web sight.

Be careful, Easton change their mind from year to year





or see this thread

http://www.archery-interchange.com/f...ead.php?t=4336

[arthurfuxake]

I quizzed Quicks in Walton-on-Thames on this very subject when I was in there last week.

Their answer: "Hmmm... We always use the Easton Guide. Dunno why we put that on page 87... we never use it here" !!!

[JohnKR]

Thanks for the replies.
Arthur, I was going to give Quicks a call to ask about this. It seams that page 87 is a mistake then.
More to choosing arrows than the Easton chart then. I will ask advice at the club from experienced folk before buying.
Cheers John.