ASTMD250680II075951000258106II~m~Designation:D2506-80(Reapproved1989)StandardTerminologyRelatingtoSolidRocketPropulsion1r~----'--__---..",AnAmericanNationalStandardThisstandardisissuedunderthefixeddesignationD2506;thenlimberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(E)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesesymbolsanddefinitionsprovidenomenclatureforthoseparametersofcommonusageassociatedwithsolidrocketpropulsion.Intheinterestofcommonunderstandingandstandardization,consistentwordusageisencouragedtohelpeliminatethemajorbarriertoeffectivetechnicalcom-munication,particularlyinthecaseofwordshavingeco-nomicimportance.2.SignificanceandUse2.1Significanttermsaregroupedintomajorcategorieswhichhavegenerallyacceptedmeanings.Withineachmajorcategory,significanttermsaregivendefinitemeanings,symbols,anddefinitions.Thefollowing'criteriadetermineacceptabilityofatermforinclusion:2.1.1Thetermisofinteresttosolidpropulsionworkers.2..1.2Thetermhasaspecificapplicationorhasbeensubjecttomisunderstandingormisuse.2.1.3Thetermisnotadequatelydefinedforgeneraluseinanystandarddictionary.2.1.4Termsareusedincurrentsystems.DEFINfI10NORDESCRIPTIONOFTERMS3.Geometry-Lineardimensionsshallbeexpressedinfeetorinche&,includinganydecimalparts,andabbreviatedasftorin.Angulardimensionsshallbeexpressedindegreesanddecimalpartsofadegree,forexample,15.23deg.3.1AreaofPropellantBurningSurface(Ab).3.2FlowAreaatNozzleExitPlane(Ae).3.3FlowAreaatGrainPort(Ap).3.4FlowAreaatNozzleThroat(At).3.5WebThicknessofPropellant(w).3.6NozzleDivergenceHalf-Angle(a).3.7NozzleConvergenceHalf-Angle(fJ).4.Impulse(I)-Impulseshallbeexpressedaspounds-force-secondsObf·s).AnumeralinthesubscripttoIindicatesthetimeelapsedfromzerotime.Thenumeralmaybechangedtosuittheapplication.4.1ActionTimeImpulse(Ia)-Theareaunderthe"thrustactiontime"portionofthethrust-timerecord.4.2Bur...
