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Originally Posted by tel Ah - that raises another point! My first riser only had one button hole, my second, two. I did ask the question a while back "what is the purpose of the front hole" (DON'T!) - that aside (but please explain) the point is consistency, regardless of where you measure it? |
The standard advice regarding the initial setting of Bracing Height, is to set it in the middle of the bottom half of the manufacturer's suggested range. That's a starting point.
The ideal BH is at the point (or points - there may be more than one) where the arrow leaves the string in the cleanest fashion. That's why you quite often see people talking about the sound of their bow, in relation to BH. That's fine if you can hear a difference (which depends in turn on the *other* sources of noise in your setup).
I've also seen it suggested that you can tell from the speed of the arrows where the best location for your BH is. Either by measuring the speed directly, or by looking for up/down patterns of arrows on a target face. I've personally not seen any evidence that these approaches work, and I suspect that the normal increase in speed as BH drops would mask any variations you'd see.
I was once told by an Olympic archer, that the only way to judge the correctness of your BH, was by the group size. You adjust your BH until you get the smallest group. This obviously depends on being able to produce consistent group sizes, but then, if you can't do that, it's probably not worth worrying too much about BH anyway...
As you can see, the point of finding a consistent place to measure BH from, is so you can reproduce a particular setting. Ideally, you should check BH at the same point in your shooting each time (i.e. before you start, 2 dozen in, after finishing) as it's likely that your string will stretch a little during the course of a session. This is why you see people "pre-stretching" strings in various different ways before shooting, or turning up at a shoot with a pre-strung bow (probably left that way overnight). Just another possible point of variation being ironed out.
As to the effects of changing BH:
Higher BH gives a slower arrow speed than lower ones (on the order of 6fps difference, for a 1.5cm change, on my setup). Lower BH makes the arrow appear a little stiffer (apparently). Higher BH might give better clearance.
If your BH goes too low, you may find the nocks being pulled right out of your shafts... (been there, done that, searched the field for tiny pieces of plastic scattered randomly between the shooting line and targets...
).
Sorry for the essay...
16-01-06, 02:18 PM
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