Morphy
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Pull or Pull Point - Describes the idea that within a sling throw's rotation there is a perfect point at which you pull into the pitch where you will achieve the highest efficiency and best control. This perfect point is based on basic geometric principles dictating how levers work. My guess is that the pull is when the slinger's arm and the sling form a right angle which should happen as far back towards the beginning of the pitch to offer you the longest powerstroke possible. This is just a crude theory, but the idea of the pull point itself I believe to be correct.
Lag or Pouch Lag - This is one that I would hear Aussie mention from time to time. The idea is that the sling is a lever and a lever exerts more or less efficient pull on the object being moved based on the angle at the fulcrum. How far the pouch lags behind, then, is crucial to good power and control.
Power stroke - The length of the pitch. The longer the power stroke the less quickly your acceleration has to increase over any one part of the pitch. This can equate to better control and obviously, better power, so long as other parts of your technique are fine.
Aiming Point The very last portion of the pitch is where most of the fine tuning of the aiming is done. This is the aiming point. It is beneficial to have a long enough power stroke that by the time you hit the aiming point you are already at or near maximum acceleration. This lets you focus that entire point of the throw on finessing your aim.
Palm Position - The position of your palm during the throw largely dictates the type of spin you put on the projectile. In my experience the palm should face towards the direction that your arm and hand are moving. If anyone else has a different view on this, please feel free to post it. For now though, this has served me well in the throws I use. If you are having problems with spin try throwing slowly and pay close attention to where your palm is facing. Additionally, trick shots can be performed by changing your palm position which will cause the shot to veer off in the direction corresponding to your palm.
Over Rotation/ Under rotation - Under rotation happens when you pull too early into the throw. Over rotation is when you pull too late. In the latter, you generally feel like you have to rush the last part of the throw to get back ahead of the pouch. Both of these concepts are typically caused by improper technique and to a lesser extent, a constantly changing projectile weight.
Over grip/ Under grip - Over grip is sometimes caused by improperly using release knots. When your fingers curl under the underside of the knot (the part facing the sling pouch) it can delay the clean release by a small fraction of a second. Which corresponds to big misses at longer ranges/small targets. Over grip can also be caused by a release cord or tab that becomes wet. As well as curling your non-retention fingers around the release cord as it extends into your hand.
Under grip is caused by a release mechanism that doesn't provide enough grip to easily control the release cord. Under grip can be caused by gripping a release cord that is too slick and/or thin in diameter. As well as ammo that is too heavy for the slings design.
Efficiency - Efficiency has to do with the amount of effort you put into the throw versus the amount of power you get out of it. Efficiency is important for all types of slinging, not just distances throws. A very efficient accuracy slinger can decrease considerably the amount of effort in his/her throw while still maintaining relatively good power. Less effort means more control which can equate to significantly better accuracy and consistency, less mental fatigue and more focus while still maintaining a relatively flat trajectory. Efficiency is largely a matter of good technique and a sling that is designed for your preferred style and ammo weight. A good way to gain efficiency is to throw at 50% effort for an extended period of time, and try to gain distance while maintaining this decreased effort. This can also greatly improve your technique.
Throwing Profile - The throws profile is a concept defining how large the arc of the throw is, as well as the direction that arc extends to. A throw's profile mostly affects hunters. A throw with a large profile or one that has the sling coming too close to the ground is not ideal for hunting because of the likelihood of snags.
Cross section - The ideal cross section for sling ammunition is always circular.
Planing - When a stone planes off a straight line path into the wind due to a non aerodynamic profile
Misfires - A Misfire is when a stone doesn't release from the slings pouch perfectly (or in some cases, it may catch on the sling cords). Since a slings ammunition rolls out of the pouch, instead of merely flying out of the pouch, shape plays a huge part in accuracy. Even a very small hitch in the stone rolling out perfectly can cause your groupings to open up and misses to occur. This is one of the most subtle difficulties with sling accuracy and usually only becomes more apparent when you begin using flawless ammo along side with slightly imperfect ammo, as well as a technique consistent enough to get rid of other possible problems.
Deceleration - Deceleration is the third aspect of a stone's shape that can affect accuracy. With two stones slung at a given distance, one perfectly aerodynamic, the other less so, if they are both slung in precisely the same way, if first one hits and the second may still miss. In fact, if the target is small enough, it almost certainly will miss. Even if your technique was perfect both times. This is caused by the second stone decelerating faster due to a higher wind resistance. This tends to be more dramatic with less dense ammo and/or smaller stones. As well as with longer distance shots. Denser ammo and larger stones, because of their increased momentum, are less affected by small changes in aerodynamics from normal target distances.
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