NooneOfConsequence
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One of the questions in my mind is what the relative timing is during the release process. This will have a major impact on how you design your sling. If the ammo leaves the sling before the release cord is out of the way, then the ammo must exit to one side of the release cord, possibly pushing the cord out of the way and interfering with the shot.
If the release cord opens up faster than the ammo rolls out, then the ammo can exit straight out of the open pouch without interference.
If the ammo rolls off to one side of the cord, your sling pouch geometry matters a lot. The more the ammo moves to the side, the more it impacts your accuracy. You can adjust your aim to compensate, of course, but if you change the pouch shape, you also have to change your aim compensation.
If, on the other hand, the pouch and cord both move out of the way first, then the shape of the pouch does not matter as much, and you could throw exactly the same way with different sling designs.
It's possible that both situations occur at different times, depending on how fast you are throwing, how heavy the ammo is, how much friction there is between the ammo and the pouch, and air resistance on the release cord... but then again, it's also possible that the ammo always releases to the side? The straight rib along the Cordailot sling suggests that the release cord moves out of the way, but we've all had situations where the cord hangs up and throws off a shot too.
This is yet another one of those investigations I haven't had time to really investigate... and yet another question that a robo-slinger could help to answer... some day.
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