Why your recurve arrow has to bend sideways around the riser to fly straight, and how to find the arrow stiffness that actually fits.
“My sight points dead straight — but the arrow still doesn't leave the bow in a straight line. Is my bow broken?” No, that's pure physics, and it has a name: the archer's paradox. At full draw, your arrow rests against the riser at an angle, pointing slightly away from the target — and yet it still hits center. The reason: on release, the nock end of the arrow accelerates faster than the tip, the shaft bends, and effectively snakes around the riser instead of slamming into it.
This is exactly where recurve diverges most sharply from compound, technically. A release aid lets the string come off in a controlled, nearly straight line, which removes most of that side-to-side bending — what's left is a gentler vertical oscillation. On recurve, by contrast, you release with your fingers off a tab, the string rolls off the fingers sideways, and the arrow needs the full sideways flex to fly cleanly.
Train Smart. Play Hard. — once you understand the paradox, you also understand why "just use stiffer arrows" is never the blanket answer in recurve.
Static spine is a lab value: how much an arrow bends under a defined load. Dynamic spine is how that same arrow actually behaves at YOUR draw weight, YOUR arrow length and YOUR point weight. Two archers with identical arrows but different draw weights experience effectively different stiffness.
If your shaft is too stiff for your setup, it bends too little on release to properly "dance" around the riser. For right-handed archers, this typically shows up as impacts left of the fletched group on an unfletched test shaft (more in Guide 5 on tuning).
If the shaft is too weak, it overshoots — the flex becomes too large, the arrow wobbles on its way to target instead of stabilizing cleanly. That costs you precision, especially at longer distances, because the error compounds over flight time.
Because a release aid lets the string go nearly straight, compound archers get away with much thinner, stiffer arrows without the flight path becoming unstable. As a recurve or barebow archer with a finger release, you depend on correct dynamic spine tuning — there's no mechanism doing the sideways flex work for you.
A shaft significantly too weak for your draw weight can be overloaded on release and, in extreme cases, break against the riser — with splinter risk to hand and forearm. Never shoot an arrow whose spine value is far below the recommendation for your draw weight, not even "just to test." When in doubt, have a specialty shop calculate the correct spine range for your setup before ordering new arrows.
Deliberately shoot an unfletched bare shaft alongside your normal arrows — the deviation in impact point immediately tells you which direction your spine leans, long before you'd notice it from group size alone. This technique is the subject of Guide 5 and the most reliable way to make the archer's paradox work for you instead of against you.
The apparent contradiction that an arrow resting at an angle against the riser at full draw — pointing away from the target — still hits center, because it bends around the riser on release instead of flying straight.
Because a release aid releases the string nearly in a straight line, eliminating most of the sideways flex. Recurve and barebow archers release with their fingers and rely on the full paradox mechanism.
Most reliably through a bare-shaft test: if an unfletched shaft deviates sideways from your normal group, that shows the direction of the spine mismatch.
Yes. Higher draw weight generally needs stiffer arrows, because the same shaft bends more under more force. A limb swap (Guide 2) almost always calls for a spine check.
Yes, just as much as recurve — barebow shoots with the same fingers and the same riser setup, just without sight and stabilizer. Spine tuning matters equally for both disciplines.
Recurve: How to Do Bare-Shaft and Paper Tuning Right