ORIGINAL: Howler
No, a correctly spined arrow and correctly set-up bow should launch like a rocket, especially if the shooter is using a release aid, finger shooters will always have some flex! An arrow that is too weak in spine will leave like a wet noodle, hence bad contact with the rest during launch.
we made it boys, 100!!!!
Ehhh wrong !
copied and pasted.
Arrow Spine: Why Does it Matter?
A properly spined arrow is simply safer, and flies better than an improperly spined arrow. To begin, if an arrow is too weak (underspined) for a particular bow, there is a risk that the arrow could break when shot. The more grossly underspined the arrow, the higher the risk of breakage. In a few rare instances, arrow failures have even resulted in serious injuries. If your arrow breaks upon release, there is a remote possibility that the remaining half of the arrow could be driven through your hand or arm. Ouch!!! To avoid the embarrassment of ever needing to explain to an emergency room doctor how you managed to shoot yourself with your own bow, we strongly suggest you NEVER shoot an arrow that's underspined for your bow.
But aside from avoiding the freak accidents, choosing a proper arrow spine will give you the best possible arrow flight and result in dramatically improved accuracy. Most people think an arrow flies just like it looks when at rest - perfectly straight. Hence the phrase "straight as an arrow". But nothing could be further from the truth. Once fired from a bow, an arrow immediately begins flexing and oscillating. That's not a defect. Arrows are supposed to flex and bend some. In fact, with respect to accuracy, an overspined (too stiff) arrow actually flies just as badly as an underspined (too limber) arrow. So don't choose an overly stiff arrow either, tough guy. Choosing an over- or underspined arrow yields absolutely no benefit - regardless of what you hunt or how you shoot.
Each arrow bends and flexes in a particular cycle as it leaves the bow (archer's paradox). In slow-motion video it becomes obvious - especially for finger shooters. An overspined arrow undercycles and leaves the bow with it's tail too close to the bow's riser usually resulting in serious fletching contact as it passes the arrow rest. An underspined arrow overcycles and the arrow's tail leaves the bow too far away from the riser with similar results the opposite way. Arrows fired with a mechanical release often cycle more vertically rather than horizontally, but the business of timing the cycle is still the same. When the spine is just perfect, the fletchings zip through the rest unimpeded and the arrow flies.....uh, well.......straight as an arrow. So we have to get the spine right.