arrow slap

[jimmy]

I know that thos topic has probably been discussed already.  I tried to research the archives, but could not find sufficient info.  What exactly causes arrow "slap" against the side of the bow?  I have a friend experiencing this with a new bow.  He is trying to match arrows to it.  This slapping is has not really been a big problem for me, but when it does happen, I want to know why so that I can help.  Any info. is appreciated.  If there are multiple causes, let's hear them all.

[Pat B]

It could be incorrect arrow spine or his release, most likely incorrect spine. Generally side to side irregularities are spine related and porposeing is caused by incorrect nock point placement.
 What is his set-up?  bow and arrows.

[E. Jensen]

Spine is too stiff

[jimmy]

I think his bow is around 48#- 50# @ 28".  He is using arrows spined 55-60.  I don't know why, but the arrows I've been making fly true from all my bows. ranging from 48#-65#.  I just don't know what they spine at.  I think his arrows must be too stiff for that bow.  Can it be affected by length?

[aaron]

yes, if they're shorter they will act stiffer. Increasing point weight will weaken them. If that doesn't help , try a weaker shaft. A self bow with a 1 1/4 wide handle that  draws 50 lbs would probably need an arrow spined 30 or 40 with a 125 grain point. (with an avarege draw length and 29 inch arrow)

[Pat B]

When you buy modern wood shafts they are spined for a 28" finished arrow with a 125gr point. For each inch over 28", subtract 5# of spine weight and add 5# for each inch less than 28". For each 25gr of point weight over 125gr subtract 5# of spine weight and for each inch under 125gr add 5#.

[tallpine]

Brace height too low will make them slap also. Twist your string up a bit and see if that don't quite it down

[bow101]

"would probably need an arrow spined 30 or 40 with a 125 grain point"  that would be my guess to. My newest arrows are in 40-45 range. Maybe the bow is to thick in the center which puts the string way off center.  A center shot bow is more forgiving.