Main Discussion Area > Arrows
Shaft spiner?
Justin Snyder:
--- Quote from: mnewcomb59 on August 17, 2006, 09:45:53 pm --- The deflection will still be the same even if the posts are farther apart. If it pulls down .565 then it will still be 50#, the length of the shaft doesn't matter.
--- End quote ---
No the deflection will be farther. It will be around .72 which will be 36 #. The 26 deflection was .565 which was 46# but when you compensate for the two inches of extra arrow outside the posts you subtract 10# which makes the true spine 36#. I shoot 31 inch arrows spined at 28 inches so with three extra inches over 28 I have to subtract 15#. Justin
mnewcomb59:
No what I mean is if you put the posts further apart... If your posts are set at 30 inches and it pulls down .565 then it is a 46# spine. Sorry bout the confusion. ;D
Justin Snyder:
No the deflection will not be the same. the deflection will be slightly more for posts 28" apart. If your posts are 30 inches apart and it pulls down .565 then you divide 30 by .565, 30/.565=53.09 so the spine is 53-54. If you spine the same arrow with the posts 26 apart the deflection will be around .278, 26/.278=93.5 so 93-94#. But this arrow has 4 more inches so we subtract 40# ending with the same 53-54# as when the posts were 30". The formula is Space between posts divided by deflection. Then you must compensate for other factors such as longer arrows or heavier tips. I'm sorry I confused you. It really is in your best intrest to just use the chart Jim Hill provided and build with the posts 26" apart, unless you are using tapered shafts. Maybe even then the difference will be minimal. Justin
Bow Bandit:
well heres a chart i made up last night for the 28" posts ... i hope its right...
Brandon
Justin Snyder:
"PERFECT" ;D ;D ;D Good job That is just what you needed for a 28 inch space between posts. You can see there is only a couple pounds difference but thats the whole point to spining. Justin
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