Designation:F1880−09(Reapproved2013)AnAmericanNationalStandardStandardTestMethodfortheDeterminationofPercentofLet-OffforArcheryBows1ThisstandardisissuedunderthefixeddesignationF1880;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheproceduretobeusedtodeterminethepercentoflet-offforarcherybows.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2F1832TestMethodforDeterminingtheForce-DrawandLet-DownCurvesforArcheryBows3.Terminology3.1Acronyms:3.1.1ATA—ArcheryTradeAssociation3.2Definitions:3.2.1ATAactualdrawlength,n—distancefromthebow’sstringatthenockingpointlocation,whileatthebow’sfulldrawcondition,measuredperpendiculartoaverticallinethroughthepivotpointofthebowgrip,plus13⁄4in.(+1⁄4,–0in.).3.2.2braceheight,n—thedistanceininchesormillimetresfromtheshootingstringofabowtothepivotorlowpointofthehandgrip,measuredperpendiculartothestringattheun-drawncondition.3.2.3compoundbow,n—atypeofbowthatimposesasecondarysystemofcontroloftheforce-drawcharacteristicontheusuallimbgeometrycontrolsystemoftheconventionalbow.Thissecondarycontrolsystemcanbecomposedofcams,levers,cables,orotherelements,oracombinationthereof.Thedualcontrolsystempermitsgreatversatilityinthedesignoftheforce-drawcharacteristicandsimplifiestheinclusionoflet-off.Ingeneral,itisnormalforcompoundbowstohavegreaterstoredenergythanconventionalbowsforagivenlevelofpeakormaximumdrawweight.3.2.4draw,n—tomovetheshootingstringofabowfromtherestorbracepositiontowardthefullydrawnpositionbyapplyingforcetosaidstring.Suchactioncausesthelimbsofthebowtobendandstore...
