What is a Fletching Jig (tool)?

In archery what is the term "let off"?

When a compound bow is at full draw, it's dramatically easier to hold the bow string back, and the term for that is "let-off." If—just for round numbers—you have a bow with a draw weight of 100 pounds and an 80% let-off, at full draw, it'll feel like you're drawing 20 pounds.

That's a big advantage for bowhunters, who may spot prey, draw their arrows, and then need to aim for a while in order to hone in on a deer / boar / elk that's shuffling around, and let-off on hunting bows tends to range anywhere from 75% to 90%.

Force and Draw Curve for a Compound Bow

Target archers who are shooting at a stationary target don't need to take as much time when aiming—in fact, aiming too long for a target archer is a bad thing, generally—so let-off isn't as important, and let-offs between 60% and 75% are pretty common on target compounds.
Credit: CompleteGuideToArchery.com

Compound bows “Let Off” or “Valley”

Compound bows also have limbs, but they’re much shorter than a recurve’s or longbow’s. They also employ cables and wheels, called cams, in generating stored energy that is eventually used to hurl an arrow.

By using cams and cables which aid in the drawing process, a compound bow is able to drastically reduce its draw weight about one half to two-thirds of the way through the draw cycle.

When the cams roll over, the draw weight drops, so an archer is holding considerably less weight at full draw than the peak draw weight. The amount of weight reduction is used to calculate the bow’s let-off.
Credit: LancasterArchery.com

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