Editing Compound bow (section)

==Specifications==
AMO (Archery Manufacturers and merchants Organization, the former name of the body now known as the Archery Trade Association) standard draw length is the distance from the string at full draw to the lowest point on the grip plus {{convert|1.75|in|cm|abbr=out}}.<ref>{{cite web|url=http://www.archerysupplier.com/wp-content/AMOStandards.pdf|title=AMO Standards|access-date=2015-03-08|archive-url=https://web.archive.org/web/20150402093322/http://www.archerysupplier.com/wp-content/AMOStandards.pdf|archive-date=2015-04-02|url-status=dead}}</ref> Because the draw force may increase more or less rapidly, and again drop off more or less rapidly when approaching peak draw, bows of the same peak draw force can store different amounts of energy. Norbert Mullaney has defined the ratio of stored energy to peak draw force (S.E./P.D.F.). This is usually around {{convert|1|ftlb/lbf|J/kgf|0|lk=on|spell=in|abbr=off}} but can reach {{convert|1.4|ftlb/lbf|J/kgf|abbr=on}}.

The efficiency of bows also varies. Normally between 70 and 85% of the stored energy is transferred to the arrow. This stored energy is referred to as [[potential energy]]. When transferred to the arrow it is referred to as [[kinetic energy]]. The product of S.E./P.D.F. and efficiency can be called the power factor.{{citation needed|date=December 2014}} There are two measurement standards of this quantity – ATA and IBO speed. ATA is defined as the initial velocity of a {{convert|350|gr|g|abbr=off|adj=on}} arrow when shot from a bow with a peak draw weight of {{convert|70|+/-|0.2|lbf|N|abbr=on}} and draw length of {{convert|30|+/-|0.25|in|cm|abbr=on}}. IBO speed is defined as the initial velocity of an arrow with a weight of {{convert|5|gr|g}} per pound of draw weight. While many manufacturers measure IBO speeds using a draw weight of {{convert|70|lbf|N|abbr=on}} and draw length of {{convert|30|in|cm|abbr=on}}, the IBO standard allows a draw weight of as high as {{convert|80|+/-|2|lbf|N|abbr=on}}, and does not specify a draw length.<ref>{{cite web |url=https://archerycountry.com/blog/what-is-ibo-speed/ |title=What is IBO speed? |work=Archery Country Blog |date=October 18, 2019 |access-date=November 17, 2023}}</ref> The average IBO speed for the majority of compound bows on the market hovers around 310–320 feet per second.<ref>{{Cite web |last=Kenny |first=Tim |date=2023-08-27 |title=How Far Can a Compound Bow Shoot? - Bow to Hunt |url=https://bowtohunt.com/how-far-can-a-compound-bow-shoot/ |access-date=2023-08-28 |website=Bow To Hunt |language=en-US}}</ref>

Brace height is the distance from the pivot point of the grip to the string at rest.  Typically a shorter brace height will result in an increased power stroke, but comes at the price of a bow that's less forgiving to shooter error and having harsher string slap.

{{Further|topic=the youth compound bow|Hoyt Ruckus}}