What is the purpose of using a double nock set when shooting three under?

It doesn't effect everyone the same way; but for me a single nock point creates a sloppy flying arrow and poor accuracy. I've often thought about why this is and I just think the arrow slips down the string during the shot.

I have friends that shoot three under with a single nock point without issues. I'm just not one of those guys. I constantly run the adjustable nock up to contact the arrow as the bottom thread nock wears.

Upper one keeps your finger from pushing the arrow up. The lower one keeps the arrow from sliding down at release. I shot for years and years with a single nocking point on top, now for the last several years with two. I don’t see a downside of having two.

There is a YouTube video around it that shows why. In slow motion you can see the arrow sliding down the string at release. I assume this problem is worse if you have loose knocks that snap on the string but once fully seated they’re a little loose.

The potential for the arrow sliding down leads to inconsistency even if it usually doesnt.

https://youtu.be/UKuQqrjf9ig

Thanks for the input

It simply keeps the arrow from moving in either direction on the string.

Nothing more and nothing less.

The arrow is nocked above center. At the release with the force applied the arrow will try to get back to the center by sliding down the string. Slow motion photography shows this. You may keep adjusting your nocking point up to correct arrow flight, with no results, because the arrow is returning to center each time. >>>----> Ken

I like the way Ken explained it. Makes sense because I thinking of before the release not after.

It should not be allowed at shoots. Let your arrow move around like the rest of us. Lol

The conventional (and consensus)wisdom is that nocks should be tight enough that the arrow should clip and hang on the string when the bow is held horizontally, but fall off with a light tap. That is usually loose enough that it can slide down the string easily at release hence the videos that have been mentioned. This can cause shelf contact and false "nock high" readings. Don't be surprised if you draw and let down the string angle at full draw has pushed the nock down an eight inch or so and that's why you allow a slight gap below the arrow for the lower nock. With two it is pretty much consistently "sandwiched" (read consistent) between the two at full draw.

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