Text only | Text with Images

Trad Gang

Main Boards => PowWow => Topic started by: Steelhead on December 17, 2009, 05:57:00 PM

Title: .360 and .400 Deflection Converted to Poundage of Spine
Post by: Steelhead on December 17, 2009, 05:57:00 PM
i was curious if any one new what poundage as far as spine a .400 and .360 deflection carbon arrow has?

example .400=75# spine or .400=80# in spine.

I have shot mostly woodies and aluminum and have a few different carbons that a gentleman said had .360 and .400 approximate spine ratings.

I am more used to poundage ratings,not deflection ratings for spine.

my 2020s were 77#s on 26 inch centers,2018s 67 #s,2115s 70#s.These were listed on the Kelly bow charts as some of you guys will remember and or Foxfire Archery later.

Thanks
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: JOEBO on December 17, 2009, 06:07:00 PM
AMO Spine

.300 = 86.7
.400 = 65.0

ASTM

.300 = 105.1
.400 = 78.8
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: Steelhead on December 17, 2009, 07:25:00 PM
thanks for the response JOEBO!
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: JOEBO on December 17, 2009, 09:07:00 PM
I missread your first Question
.360 = 72.2
Amo spine is 2#@ 26"
Astm spine is 1.94#@ 28"
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: Mike Burch on December 17, 2009, 09:12:00 PM
What's .500?
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: Fletcher on December 17, 2009, 09:39:00 PM
52 lb AMO
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: JOEBO on December 17, 2009, 09:41:00 PM
Mike
Amo .500 = 52.0
Astm .500 = 63.0
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: Steelhead on December 17, 2009, 11:30:00 PM
Thanks again!
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: SlowBowinMO on December 17, 2009, 11:33:00 PM
Easiest way to do it is 31.5 divided by the spine.

31.5
-----   =  63 pounds
.500


That is to convert common carbon spines into wood/AMO ratings (26" centers).
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: hayslope on December 18, 2009, 10:23:00 AM
Stu Miller's calculator is a free download.  It has a converter built in that does all that for you.

Do a search on PowWow.
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: Lucas K on December 19, 2009, 04:15:00 PM
What is ASTM?
Lucas
Title: Re: .360 and .400 Deflection Converted to Poundage of Spine
Post by: coaster500 on December 23, 2009, 12:36:00 PM
Stu's new revised version even accounts for arrow footings. He is constantly improving this tool.
Text only | Text with Images