wood spine that matches a 2018

[Slickhead]

I shoot a 2018 28.75 inches long
50 lb Savannah with 125 gr head
FF string

Im looking to get some wood shafts and would appreciate any spine advise.

[Hud]

3Rivers has spine charts for wood arrows and traditional bows. My guess is 55-60#, but if your bow is fast, and cut 3/16 from center, with FF string, try 60-65#. Aluminum arrows and Graphite are spined at 28", while wood arrows are on 26". The standards are different.

[Prairie Drifter]

2018 spine out at 68 lbs

[Gator1]

Is there a chart prairie drifter you reference?

Same set up what would a 2016 spine at comparably?

Thnk you

[Tajue17]

just some advice but back in the day I noticed that a wood arrow spined exactly the same as an aluminum arrow did not come off the bow as good as the aluminum arrow.  I forget the point weights I had but when I shot 2018's out of a 53# preditor I changed over to woods and only 11/32 54lb spine would work with 125 grain points so 55/60  but where my bow was more center shot I even shot 50/55 leaning more towards 55lb spine shot perfect (27 1/2" draw using a 28 1/2" BOP arrow) .....

I noticed with woods I had to pay more attention to the flight of the broadheaded arrows over the fieldpoints,,,,, once the arrows with broadheads came off the bow quiet (weak you'll hear a knock)  and straight with no nock kick and hit where I was looking I stayed there,, think I had to raise the string nock a bit too changing to woods.

I'm sure 23/64's will be different,, even so heavy 5/16's if you can find them.

just my experience but good luck.

[AkDan]

2016=59.5  

with ALL arrow tuning there is a lot of factors to consider, these are just references/starting points.   They SHOULD be close but may be way off.

 Like taj mentioned making the change from skinny arrow to a piece of rebar wood, will make adjustments to center shot, along with physical weight alone COULD also effect it...lots of variables.   Even the same diameter say a 2364 alum to in theory a similar spined wood in 23/64 may or may not fly.  

This is the joys of shooting sticks!  There is few really set hardfast rules, and more so a heckuva lot more 'swag guidelines', instead of permanent marker!

[AkDan]

Gator, there is.

Google calibrating spine testors.  You'll find posts by some of the bigger arrow guys out there (past and present), Kelly, Bob, and a few others posting charts.  

basically if you have a spine tester.
its distance between centers (26 for wood) divided by deflection = pounds, or 'dbc' x pounds = deflection  Find a 2 pound weight and some way to swing a arm and you have yourself a simple home made spine testor....or recalibrate yours....OR find out how bad some companies testers are off LOL!

[SCATTERSHOT]

Shaft Size XX75 Spine Old GG or 24SRT Spine
1616  32#
1716  38#
1718  42#
1816  44#
1818  50#
1916 53# 55#
1918  60#
1920  65#
2016 61# 63#
2018 67# 70#
2020 77# 80#
2114 64#  
2115 70#  
2117 81# 83/84#
2216 84# 86#
2219 95# 98#


Here ya go... Arrows by Kelly spine chart from actual measurements.

[SlowBowinMO]

It's not as easy as simply crossing the static spines, the dynamic spines between the two materials will play out quite differently in actual use.

What is the shelf on your Savannah cut to depth wise?  This is secondary only to draw weight and draw length as far as figuring spine needed.  Cut short of center, to center or past center and how much?

[snag]

Originally posted by Braveheart Archery:
It's not as easy as simply crossing the static spines, the dynamic spines between the two materials will play out quite differently in actual use.

What is the shelf on your Savannah cut to depth wise?  This is secondary only to draw weight and draw length as far as figuring spine needed.  Cut short of center, to center or past center and how much?

  Different materials react differently when put under tension.

[elkken]

2018's are my favorite aluminum shaft and the woodies I shot out of the bows that the 2018's shot best were 70/75's .... if you are going to be hunting with your woodies don't go too low on your spine, I would not go lower than 65/70 for 2018's .... most of the bows I was shooting where 55# and my draw is 28

[texophilite]

I have always found it easier to make an over spined arrow fly cleanly with a hunting head. For me a 60-65 spine flies well out of my 50# recurve cut 28 inch at the back of the head. I can switch to a 2018 and not tell the diverence in impact point or arrow flight.  L.