Primitive Archer

Main Discussion Area => Arrows => Topic started by: triggerfinger on August 10, 2011, 08:02:25 pm

Title: spining footed shaft.
Post by: triggerfinger on August 10, 2011, 08:02:25 pm

doyou spine the boo before or after you foot them, does footing change spine.

Title: Re: spining footed shaft.
Post by: CraigMBeckett on August 12, 2011, 11:26:17 pm

Spine before then you know you are not wasting the effort on a too weak or too heavy shaft.

The footing will alter the dynamic spine, the footed area will not have the same mass as the equivalent length of bamboo.


Remember static spine puts you in the ballpark, you have to shoot the arrow (as a minimum at the distances you intend to use the arrows) to see if it suits you and your bow.

Craig.

Title: Re: spining footed shaft.
Post by: Pat B on August 13, 2011, 02:13:19 am

Craig nailed it. Spine your arrow and consider the foreshaft as a point. AMO spine is calculated on a 28" arrow suspended between 26" uprights with a 2# weight uhung from the center. The deflection will determine the actual spine. This calculation is for a 28" arropw with a 125gr point. For every inch over or under subtract/add 5# of spine weight. Any deviation in point weight will change the effective spine weight too. You will have to consider your foreshaft with your point weight.

Title: Re: spining footed shaft.
Post by: triggerfinger on August 16, 2011, 01:02:37 pm

thanks guys,  you are helpful as always.