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Tip string grooves
bassman211:
I will be trying it soon again, and post results on longer string follow bows to see the difference in speed.
pierce_schmeichel:
So I did another test but with a small sinew backed osage bow. It was 39.5"ntn, 37lb draw weight, 23" draw, and with side nocks. It shot a 400gr arrow 120fps on average.
I then converted it to a vnotch and removed 130 grains of total mass. The bow was still 39.5" ntn with a draw weight of 37lbs at a 23" draw. This time it shot the same 400gr arrow 135fps on average.
My conclusion is that the bow wood must not matter much at all, it seems to be a fairly proportional change. Also, it tells me that, if what tim baker says is true 65gr tip mass reduction 1-2fps gain, there must be something else going on here giving us this extra speed. The mass reduction only accounts for about 2-4fps of speed gain.
The photo is an example of how tiny you can get these tips!
bassman211:
The V notch nock has to be cutting string friction at the draw, and release.
bassman211:
Today I tested a 60 inch nock to nock moose sinew backed Osage bow that has one, and quarter inches of string follow. The bow is 31lbs, at my draw, and has a 14 strand FF 652 string. With the regular limb nocks the bow shot through the chrony at 140 fps. Ten shot average. With the cut in V nock the bow shot through the chrony 140 fps. Ten shot average. Really confused, but that was my honest results of the test. ??? ??? ???
bassman211:
I just piked that bow 2 inches. The bow is now 59 inches long, and 35lbs at my draw. I can still handle a 35 lb bow. It shot through the chrony at 145 fps average 10 ten shots with regular nocks. I will leave it go at that. Good building , and hunting.
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