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over-the-tip stringing
godfreymik:
I finished this bow and did the experiment. Same bow, same string tied to get the same brace (5 1/2"). I shot the same three arrows, once with the string over the top and once with th string nocked normally. The results surprised me with the dramatic difference. Over-the-tip: 145.2 FPS, 146.4 & 142.8 Normal nocking: 131.6 FPS, 132.2 & 132.8.
I'm glad I was lurking on gratis site when pierce_schmeichel posted last October.
Badger:
That is a dramatic difference. I think I see why, but I am not sure. I kind of suspect that the knock style you are using breaks over a little like a recurve giving you a little let off right around that 18 to 20 inch point of your draw. It might flatten out the curve at that point giving it performance of a bow maybe 6# heavier.
bassman211:
I have tried it on 2 different length bows. It showed some difference on the short bow that was reflexed, and none on the longer bow that was deflexed. The example above shows that you made a longer bow. When I did it I shot first through the chrony 10 shots with the normal nocks.. Then I cut the v, or u groove were the regular limb nocks were. It is puzzling to me , but that is what it showed through my chrony. The weather is breaking now, so I will try it a few more times with some of my older less cherished self bows. Both long, and short.
superdav95:
--- Quote from: godfreymik on March 30, 2025, 04:08:03 pm ---I finished this bow and did the experiment. Same bow, same string tied to get the same brace (5 1/2"). I shot the same three arrows, once with the string over the top and once with th string nocked normally. The results surprised me with the dramatic difference. Over-the-tip: 145.2 FPS, 146.4 & 142.8 Normal nocking: 131.6 FPS, 132.2 & 132.8.
I'm glad I was lurking on gratis site when pierce_schmeichel posted last October.
--- End quote ---
Ya I believe that string groove friction and moving of energy transfer out to very tip is part of the reason at least for performance improvement. I am presuming that you achieved same brace height by twisting the string a bit? Good experiment actually. Those string grooves look nice a neat with burnt in grooves. I do this on my yew bows. I may have to try this on a longbow to see what happens.
Badger:
The speed difference represents only about 3ft#'s, but it is over a 20% jump in power. Would you mind doing a force draw curve on those two set ups, at least the last 4" or so.
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