Newsletter - National Field Archery Society

Newsletter - National Field Archery Society Newsletter - National Field Archery Society

27.10.2014 Views

Crossbow cocking aids proposal Following the proposal made by Chris Cox to allow the use of cocking aids for crossbows in NFAS, Chris Aston wrote the following article in response. The committee has decided to share this information with all members ahead of the upcoming AGM... Exact wording of proposal: 24 Crossbow Cocking Aids - Proposal from Chris Cox Delete the following words the rule Crossbow (XB) “No cocking aid, other than a foot stirrup is permitted” Simply deleting these words wouldn’t be enough. The proposer needs to define which type of cocking aid he wants to be permitted under the proposed XB rule change. This will open-up another area for debate as to which type of cocking aid is best suited for use in competitive field archery. Add the words to the rule Crossbow (XB) “Crossbow bolts must not weigh more than 500grn” If we do the maths, a 500 grain bolt at 300 fps will generate around 100 ft/lb of KE at the “muzzle”. Under the existing XB rules a 175lb crossbow shooting a 400 grain bolt generates 80 ft/lb KE (manufacturer’s figures) – which experience has shown is already near the limit of the stopping-power of a part-worn layered foam target butt. What are the benefits of your new proposal? A cocking aid reduces the risk of personal injury to the Archer, reducing the physical strain of cocking. It also eliminates the risk of finger injury through unlatched string slipping off the fingers. Learning to shoot a crossbow should be treated like learning to shoot with any other type of bow i.e. start off with light equipment, learn the techniques and gradually build-up the strength needed to handle heavier draw weights. There is little risk of injury providing the beginner is adequately instructed in crossbow handling techniques by a competent person and he or she is using a draw weight that they can cock (and un-cock) by hand without undue strain. It’s likely that even experienced archers will struggle to master crossbow handling techniques if they don’t start with a light poundage crossbow (e.g. 90 to 125lbs for adults, 40 lbs for under 18s). On the subject of draw weights, there is no real need to shoot a heavy draw-weight crossbow. The 2011 and 2012 3D Championships were won with 125lb crossbows – with scores equal to those of the winning compound limited archers. It arguably improves accuracy which in turn improves safety. By Chris Aston Using a cocking aid will improve the accuracy of a crossbow because it ensures perfect string alignment. It also reduces the cocking effort by around 50%. Using a cocking aid improves safety? – Possibly, but only by lessening the likelihood of a miss-fire caused by an archer not being strong enough to handle their equipment safely, or in other words if the archer is overbowed.

It provides a mechanism to safely un-cock the crossbow. If a cocking aid is allowed then yes, it can be used to un-cock the crossbow. But how safely it can be done depends on the archer’s ability, eg how would someone manage using one hand? Crossbow performance is limited, exceptionally high poundage crossbows excluded by the 500grn bolt weight limit combined with the existing arrow speed limit which will control the maximum performance of the crossbow and limits the KE to that of a 75lb Compound Bow. What does the proposer mean by “Crossbow performance is limited”? The wording is ambiguous. The proposer’s comparison of crossbow performance versus a 75lb compound bow is misleading. Weight-forweight, speed-for-speed, because of its shorter length (on average 1/3rd shorter than a 30” arrow used by a compound bow archer) it’s significantly easier for a crossbow bolt to pass completely through a layered foam target butt – especially in wet conditions. The proposed rule change (500 grain max bolt weight) could increase crossbow bolt KE by up to 25%, thus increasing the risk of dangerous pass-throughs (due to higher residual KE). The increased KE and momentum (hitting power) could also make it more difficult to remove crossbow bolts from 3D targets, with an increased risk of target damage. Easily policed unlike a draw weight limit any club can verify compliance with the rules using a Chronograph and a grain scale. Because it’s a safety issue, every crossbow and crossbow bolt should be checked at every Open Shoot – this would be unworkable. Allows those carrying injuries currently shooting with dispensation to compete and extend the competitive life of older archers. From this point of view there may be a case for creating an additional XB ‘Limited’ classification for those archers who, for whatever reason, are unable to cock a crossbow by hand. Allowing the use of a cocking rope, linked to a maximum draw weight limit (150lbs?) or a reduced arrow speed limit (250 fps?) could be a way forward (limiting arrow speed would be the easier option to monitor). Conclusions I’ve tried to be objective with my comments – but my personal opinion is that allowing cocking aids would be a step too far for the existing XB classification. I am strongly against Chris Cox’s proposal for safety and sporting reasons. The use of cocking aids will encourage the use of heavier weight crossbows and bolts which will have a negative impact on all aspects of safety in the field. From the sporting point of view all good crossbow archers know that cocking the bowstring even fractionally off-centre will destroy accuracy. Cocking a crossbow by hand is the virtual equivalent of ‘finger-shooting’ with a vertical bow; accuracy depends upon the archer’s skill in drawing and anchoring the bowstring in a consistent manner. For all NFAS archers – regardless of their bow style – the draw, pulling the full weight of their bow using their fingers, forms the foundation of a good shot. It is one of the defining features of the sport of archery. But use a cocking aid and crossbow shooting becomes something other than archery. For these reasons I am fundamentally against changing the existing NFAS XB style rules. Chris Aston NFAS Xbow Shooting Member (Independent) 25

It provides a mechanism to safely un-cock the crossbow.<br />

If a cocking aid is allowed then yes, it can be used to un-cock the crossbow. But how safely it can be done<br />

depends on the archer’s ability, eg how would someone manage using one hand?<br />

Crossbow performance is limited, exceptionally high poundage crossbows excluded by the 500grn bolt weight<br />

limit combined with the existing arrow speed limit which will control the maximum performance of the crossbow<br />

and limits the KE to that of a 75lb Compound Bow.<br />

What does the proposer mean by “Crossbow performance is limited”? The wording is ambiguous.<br />

The proposer’s comparison of crossbow performance versus a 75lb compound bow is misleading. Weight-forweight,<br />

speed-for-speed, because of its shorter length (on average 1/3rd shorter than a 30” arrow used by a<br />

compound bow archer) it’s significantly easier for a crossbow bolt to pass completely through a layered foam<br />

target butt – especially in wet conditions.<br />

The proposed rule change (500 grain max bolt weight) could increase crossbow bolt KE by up to 25%, thus<br />

increasing the risk of dangerous pass-throughs (due to higher residual KE). The increased KE and momentum<br />

(hitting power) could also make it more difficult to remove crossbow bolts from 3D targets, with an increased<br />

risk of target damage.<br />

Easily policed unlike a draw weight limit any club can verify compliance with the rules using a Chronograph and<br />

a grain scale.<br />

Because it’s a safety issue, every crossbow and crossbow bolt should be checked at every Open Shoot – this<br />

would be unworkable.<br />

Allows those carrying injuries currently shooting with dispensation to compete and extend the competitive life<br />

of older archers.<br />

From this point of view there may be a case for creating an additional XB ‘Limited’ classification for those<br />

archers who, for whatever reason, are unable to cock a crossbow by hand. Allowing the use of a cocking rope,<br />

linked to a maximum draw weight limit (150lbs?) or a reduced arrow speed limit (250 fps?) could be a way forward<br />

(limiting arrow speed would be the easier option to monitor).<br />

Conclusions<br />

I’ve tried to be objective with my comments – but my personal opinion is that allowing cocking aids would be a<br />

step too far for the existing XB classification. I am strongly against Chris Cox’s proposal for safety and<br />

sporting reasons.<br />

The use of cocking aids will encourage the use of heavier weight crossbows and bolts which will have a negative<br />

impact on all aspects of safety in the field.<br />

From the sporting point of view all good crossbow archers know that cocking the bowstring even fractionally<br />

off-centre will destroy accuracy. Cocking a crossbow by hand is the virtual equivalent of ‘finger-shooting’ with<br />

a vertical bow; accuracy depends upon the archer’s skill in drawing and anchoring the bowstring in a consistent<br />

manner.<br />

For all NFAS archers – regardless of their bow style – the draw, pulling the full weight of their bow using<br />

their fingers, forms the foundation of a good shot. It is one of the defining features of the sport of archery.<br />

But use a cocking aid and crossbow shooting becomes something other than archery.<br />

For these reasons I am fundamentally against changing the existing NFAS XB style rules.<br />

Chris Aston<br />

NFAS Xbow Shooting Member<br />

(Independent)<br />

25

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