Remember, some bows, when braced too high, can become very “twitchy” with respect to vertical stability.

Unsurprisingly, this is usually well within the manufacturer’s recommendation range. Use your ears! More often than not, the “best” brace height for a given recurve bow is where that bow shoots most quietly. How do you find the best brace height for the recurve bow? Frankly, Easton overdoes this a little bit- there’s so little difference (potentially, none after cutting) between a batch of, for example, category C3 arrows and a batch of category C4 arrows, that once cut, assembled and fletched, they can be mixed with no issues. In addition, they further ensure every dozen shafts are within 0.5 grains. So, Easton goes to the trouble of exactly weight sorting the shafts, putting them in weight categories (C1, C2, etc) to ensure that not only do you have a perfect spine (which is the most important consideration) but the shaft weights are uniform as well. Since there’s some variation in the carbon from batch to batch, some shafts of the exact same spine might still be a few grains lighter or heavier than others. In order to cope with this, Easton first specially selects the carbon fiber and does a few proprietary things to eliminate as much of this variation as possible, and then they build shafts of the exact same spine (static stiffness). It’s generally not so with carbon fiber arrows, which have a significant stiffness variation in production compared to aluminum.

The great thing about aluminum arrows is that you can get shafts to exactly match ones you had 20 years ago and 20 years into the future. With aluminum arrows, the specific stiffness- the stiffness for a given mass of material- is always exactly the same for a given alloy. Why are there “weight codes” on high end Easton A/C shafts? Is this important? A simple walk-back test can be used to confirm the correct setting. The larger size X10’s tend to dynamically self-compensate for centershot and so generally they should be aligned closer to center than conventional shafts. This is because of the relatively large barrel on the shaft. These settings work fine for the shafts weaker than 650, but for stiffer shafts, less centershot is needed than for ordinary parallel shafts. What is the best centershot setting for the X10?Ī common error made by intermediate shooters using X10 shafts is that they apply “textbook” centershot settings to the X10. Better to use the correct size arrow, or slightly reduce bow weight Generally, up to one inch can shift the shaft an equivalent of halfway toward the next stiffer shaft size- however, this reduces the effective forgiveness feature of the shaft design, which is why it’s generally not recommended. However, the exact answer to the effective amount of change varies by a number of variables, the biggest of which is the relative string amplitude at release of the archer – something no chart can account for completely. As the shaft is cut from the rear the “tail spine” of the shaft gets stiffer. This is because of the long taper on the rear of the shaft, and how the arrow reacts to “loading” on release. What’s the effect of cutting an X10/ACE from the rear/How come there’s no chart to tell us the effect/Why doesn’t Easton recommend cutting these shafts from the back?Ĭutting X10 (or, to a somewhat lower degree, the ACE) shafts from the rear of the shaft results in an effectively stiffer arrow reaction, one that is disproportionate to cutting the same amount from the front of the shaft. Also, the cost to produce the X10 is considerably more due to the materials and techniques required to hit the required tolerances. For the same reason, removing points requires a little more care and time in order to avoid overheating. Another factor is that more care is needed when gluing components, which is also due to the small diameter. The main disadvantage of the X10 is the fact that smaller diameter arrows at higher momentum potentials require better target materials to help prevent excess penetration or pass through. Most importantly, the X10 has a high ballistic coefficient – it correctly balances mass weight and momentum for better performance from recurve bows at longer distances, especially in windy conditions. The X10 is also designed with three distinct, custom spine zones- and specifically, a less stiff and- importantly- lighter tail section, which improves clearance and finger release consistency, compared to the much stiffer and heavier tail sections of parallel shafts (or even so-called “tri-spine” shafts from other makers). There are several advantages- the smaller diameter of the X10 shaft presents less surface area and a smaller cross section, which is very helpful in windy conditions at longer distances. What advantage does the X10 have over other shafts? Are there any disadvantages?

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