ASTM_F_1722_-_15.pdf

Designation:F172215Standard Test Method forDetermining Mass and Moment of Inertia of Alpine Skis1This standard is issued under the fixed designation F1722;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers test measurement methods formass and moment of inertia of adult Alpine skis.21.2 No limitation to ski size is proposed.This test method isapplicable to all adult Alpine skis.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3F472 Terminology for Geometry of Alpine Skis2.2 ISO Standards:4ISO 554 Standard Atmospheres for Conditioning and/orTestingSpecificationsISO 6003 Alpine SkisDetermination of Mass and PolarMoment of InertiaLaboratory Measurement Method3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 mass of ski,mthe mass of a finished,manufacturedski without any mounted parts,expressed in kilograms.3.1.2 moment of inertia,Ithe mass moment of inertia ofthe ski about its center of gravity,expressed in kilogram-metressquared.4.Significance and Use4.1 This test method provides a means for determining themass and moment of inertia of adult Alpine skis.It is notintended to evaluate data with regard to the quality of the ski.5.Apparatus5.1 Weighing Device,accurate to 60.02 kg.5.2 Fulcrum,for locating the center of gravity of the ski.5.3 Time Measurement Device(stopwatch),accurate to atleast 0.1 s.5.4 Measuring Device,in accordance with Fig.1,consistingof the following parts:5.4.1 Clamping Device,A,consisting of two clampingfixtures.The top clamping fixture has a hole with a mark tolocate the center of gravity and two additional holes at adistance,df,from the center mark for fixation of the filaments,B.The recommended dimension for dfis 75 mm,and the massof the clamping device shall be less than 0.1 kg.5.4.2 Top Plate,C,with two holes separated by the distance2dffor the fixation of filaments,B.The plate,C,shall be fixedon a stiff,horizontal beam.5.4.3 Two Filaments,B,with equal lengths,l,that connectthe top plate with the clamping device.The ratio df:l shall beapproximately 1:40.With the recommended dimension df=75mm,and the length,l=1000 mm.The filaments shall be madeof materials with low elongation and high strength(forexample,tennis racket string and fishing line).The diameter ofthe filaments shall be not more than 1.0 mm.6.Sampling and Conditioning6.1 In order to ensure comparability,it is recommended thatone of the following ski sizes be used if the data measured areto be published:150,165,or 185 cm.The ski size,measured bychord length(see Terminology F472 for the definition of chordlength),should be within 3 cm of the value chosen.From thesethree sizes,choose the one that is most representative of thetested model.6.2 All measurements shall be taken from a finished,manu-factured ski without any mounted parts.6.3 All measurements shall be taken from a ski that has beenconditioned in a standard atmosphere 20/65(ISO 554)(that is,1This test method is under the jurisdiction of ASTM Committee F27 on SnowSkiing and is the direct responsibility of Subcommittee F27.30 on Skiing andSnowboarding Equipment.Current edition approved July 1,2015.Published August 2015.Originallyapproved in 1996.Last previous edition approved in 2009 as F1722 09.DOI:10.1520/F1722-15.2This test method is meant to conform in all significant aspects to the testmethod for determining mass and polar moment of inertia ofAlpine skis as set forthin ISO 6003.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4Available from American National Standards Institute,11 W.42nd St.,13thFloor,New York,NY 10036.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the ski shall be placed in this atmosphere for at least 24 h priorto measurements being taken).7.Calibration of Measuring Device7.1 Differences in construction between the different mea-suring devices can lead to different measurement results,whichdeviate from the theoretical value of the polar moment ofinertia.In order to reduce such deviations,it is recommendedthat a test equipment validation factor,c,be determined foreach measuring device.7.2 The test equipment validation factor