Wood shafts are usually described with bow weight range (e.g.50-55#). What weight range corresponds most with 600 spine?

In other words, I like 600 spine with a particular bow. What bow weight range might be a wood alternative?

I shoot 600 carbons, when shooting woods, I need 5/16 shafts, 75 gr points, 40-45 spine.

Wood Spined about 43#s....

Deflection on the left, poundage on the right.

If the 600 spine your using is carbon, its calculated by a different standard than a wood shaft. And to be honest there is so much variance in carbon shafts from manufacture to manufacture its really difficult to say. You would be better off giving the specs of your bow; weight@inchs, depth of shelf, string type (Material), draw length, desired arrow length and point weight. The correct arrow can be determined from that.

Bob

JK, This is gonna be rat interesting since You are working with APPLES versus Oranges but also that different woods MIGHT be like various varieties of apples (Duggy fur, POC, Spruce, Ash etc.) Might be a good idea to talk with people who sell wooden shafts? BTW? You planning to "roll-your-own" or get ready made? ALSO??? Consider AROMAKER said about describing EVERYTHING & ANYTHING about Your "go-to" bow. BLESSED BE! BATMAN

As Bob said, most carbons and aluminum use “Easton” spine measurements, rather than AMO. From my chart: .615 Easton= .492 AMO = 53# .603 Easton = .482 AMO = 54# .591 Easton = .473 AMO = 55#

So a .600 carbon is closest to 54# wood. (That is if your carbon actually spines.600 Easton. Again as Bob said, since there is so much variance between different carbon manufacturers and what they say their shafts spine.)

FYI- Easton uses a 1.94# weight and 28” or 29” centers- can’t remember which. And AMO is a 2# weight and 26” centers for measuring deflection. Approximately (Easton)x .80= AMO

I have found the above chart helpful. Even more helpful are the folks at Wapiti Archery. The offer a test kit and will really work with you to get you matched arrows.

Thanks everyone. Don't know the particular Hillish longbows wgt (or maker) but its been shooting 60# extreme longbows 55-60 chundoos waay left...so today I was amazed how well & tight/centered my 600 trads flew. Low profile 3.5" feathers. Still, 600# trads fly just as well from everything including that 60# (sorry about that).

New wood arrows will be chundoos or Doug fur. I roll my own. Dont we all?

JusPassin: I believe the reason for the rather large difference between the AMO Spine Deflection Chart posted and your ACE Spine Tester is because the scale face of your spine tester isn't a "Direct Correlation Scale" because there's a spread difference where Carbon/Alum. deflection is measured between a 28" spread while wood spine is measured between a 26" spread.

So one measurement doesn't equal the opposing measurement on the scale face as it depends on what you're measuring and the appropriate spread distance.

Jinkster, if you could see what is written on the Ace it states the scale is correct for both wood or carbon/aluminum once you've adjusted the support points and weight.

Hopefully this will also help. Arrow is an old autumn orange aluminum.

JusPassin: Correct...but that's what I'm saying...

It's either one or the other depending where the support points are set but it is never both at the same time.

You guys make this way more complicated than it is. The OP asked what spine woodies compare to .600 carbons. Doesn't matter if you compare at 26" or 28" centers.

I have a Don Adams tester, measures on 26" centers. I shoot .600 Gold Tips. They spine between 52 and 55# on my tester. Woodies spined between 48 and 52# fly the best out of the same bows.

I think the diameter of the woods allows me to shoot a slightly weaker shaft in wood as compared to carbon.(See Rick Barbee's thread last week about which arrow is stiffer)

Bob B., I know you make a living making wood arrows, but have you ever shot carbons? Ever tested them on a spine tester? You state that they're so inconsistent in spine. Not my experience at all, at least not ones made in the last 5 yrs.or so.

also the 600 carbon may not be the spin your shooting? length and tip wt. will change the spine of the 600. the shaft saying 600 is deflection at 28". a 600 28" shaft with standard insert and 100 gr tip would be close to 600 spine. any changes like length are tip wt will change the spin. for instance a 30" shaft in 600 with 200gr. up front will not be 600 spin. you would be more like 700 spin.

My simple question turned into a theological thread about spine testers. Rabbis arguing.

Dale in Pa answered my question directly...PLUS he added the bit about diameter. About to place a shaft order I'd been wondering about that. My thicker woods fly just as well as my skinny woods and they're tougher, so that question's answered too.

bigdog21 makes a good theoretic point about dynamic spine that'd be relevant shooting crazy heavy points on carbons and planning light points on wood, or very different lengths, wood Vs carbon. I shoot 29.5"...like Grace Slick said, "feed your habit!"

I have two bows that bareshaft perfect with 600 Axis and 125 gr points for wood arrows they both like 52-54 lb spine and 100 gr points. Going up in spine for 125-135 gr BHs

To answer the question (although Bob mentioned something that has been my experience as well) take the .600 deflection multiply it by .825 (that's the conversion) and you have .495.

That gives you a spine of 52.5lbs.

Dale in Pa. I don't make statements that I haven't tested. I have a tester that reads in deflection of thousands of an inch with uprights that are adjustable and two certified weights of 2# and 1.94#. and have compared as many different manufactures of carbon shafts that I could find. and yes there is a great deal of difference in carbons shafts carrying the same spine rating

Bob

Bob, reread your 1st post, and yes you're right, different manufacturers of the same spines do vary somewhat. However they are close enough to work with slight changes in length and or point weight.

Didn't read close enough the 1st time, I thought you were referring to the same arrows in a doz.

Dale: Spine is suppose to be a standard, like measurement; an inch or a foot need to be the same regardless of who makes the measuring devise, you shouldn't have to worry about adjusting length or point weight to get what you want. The problem is manufactures primary consumer is the wheel bow shooter that merely needs to change the position of the arrow rest to get most any carbon shaft to shoot.

Bob

Agree Bob, but the same thing happens when you buy a batch of supposedly matched woods from different vendors, might have to fine tune.

When Kelly was in business I could count on very high consistency withing pound-ratings as well as very high consistency of mass weight within pound ratings (ie within spine). I donfirmed all of that when I got shafts just for the fun of it.

jk:

"I donfirmed all of that when I got shafts just for the fun of it." Say what!!!! Bob

Bigdog ...that info would be useful if I knew the weight of this bow...I'm guessing 50lbs but it's an unusually short Hill type @ 62". Cast falls short of my 52# Groves with same arrows, which makes sense but is better than my 38# foam limb Hoyt...it's a great little bow...was just thrown into a trade to sweeten the deal...because that guy didn't like it and I was into heavier longbows (like Fazio) I ignored it for years.

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