question about arrow spine

[JrsyBowHunter]

does dipping and cresting an arrow change the spine of the arrow, thanks for any help guys

[jarhead_hunter]

I have weighed aluminum arrow shafts before crowning and cresting.

The weight of aluminum shafts of equal length and size are very consistent.

The last batch I weighed was 2117's at 29 inches.

Average weight of 12 shafts was 361.7 grains. Individual shaft weights ranged from 360.1 to 363.3 grains.

I then crowned and crested the shafts with 2 coats of Fletch Lac, a white base (5 grain increase) and a yellow finish ( 6 grain increase) dip, or second coat.

The average weight after crown and crest had increased by about 11 grains per shaft. Weight increase ranged from 10.2 to 12.7 grains.

There was no noticeable difference in point of impact, measured arrow velocity or trajectory at a distance of 20 yards.

I used 4 raw shafts that were fletched only as a control.

Hope this helps.

Charles.

[lpcjon2]

With wood it would not be a significant amount to change the spine.JMHE

[J. Oles]

Not that I'm a good enough shot to tell, but it would dynamicly stiffen the arrow.

Jason

[JrsyBowHunter]

i shoot goldtip trad arrows 5575 which is a 400 spine

[JrsyBowHunter]

i paint the back 9 inches of the arrow crest them and then clear coat them

[Bjorn]

No change in spine even with multiple dips. Weight will change depending on the products. Paint and 3 dips equals about 35 gns fletch and nock another 25.

[Stumpkiller]

Adding weight to the tail of an arrow has a small effect in increasing spine (less than the relative decrease of the same weight added at the head because the nock stays in contact with the string for the initial "launch").  But the amount added by a thick crown dip is probably less than a one pound in spine change.  Cresting has no effect.