i am just wondering...everyone talks about spine and how to get the correct spine on an arrow....however,,,,if you are overspined or underspined what damage does this cause??

bad arrow flight? is it bad for your bow? i am just wondering

Underspined....broadheads will group right of your field points, overspined....they'll group to the left.

1st, bad arrow flight, bad groups, might even cause clearance issues, and wear on your fletchings. Second, there was alot of testing that concluded that bad tune, caused arrow spine to loose spine over time. I used to not believe it until I saw it for myself. I shot some beman hawks for years for a spare bow. Over time, they lost alot of spine.

ok..thanks guys...

Generally, too much is easier to deal with than too little. But don't make the mistake of several folks I know and deliberately run too stiff of an arrow. You try to get as close as you can to ideal, and if you have to choose, err on the side of a little too stiff. Adjustable draw weights, different weight heads, and the latitude to cut arrow shafts to length has always given me the ability to tweak the spine to a nearly ideal stiffness.

I'd always lean a touch toward overspine vs. underspine, esp. if you've considered upping poundage any at all. Theoretically, underspine equals more wobble which should result in poorer arrow flight, and more inconsistency. But the NUMBER 1 reason I won't shoot underspined is.....
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OUCH!!!!!

holly crap!!! that sux....

u guys talk about getting to the "ideal spine" .... what is the simpiliest calculation to get that??

i mean, if you know draw length and draw weight how do you calculate the "ideal or perfect" spine on that arrow

Scary? Yep but more than likely shooting under spine was not the cause. I have seen arrows that were over spined blow up as well. A damaged shaft will explode regardless of the spine.

I agree with most. You need to get as close to ideal as possible

Dan

I got that pic in an e-mail yrs ago. It had nothing to do with spine! The arrow was damged and it was shot......... a damaged arrow may cause it too be underspined but I don't think thats what this about. You should post pics of the guy with the allum arrow in his hand too...... overdraw back in the day. Or the one of the guy with a BH stuck in his skull...... guess he stood up in front of a friend that was about to shoot. I'm no pro but I would think a pic like this the guy would have to be shooting .500 spined shaft on a 90lbs+ draw weight. That pic has little or nothing to do with this thread........... unless your the guy that got the arrow thru your hand[:-]