ASTM F1722-96

Standard Test Method for Determining Mass and Moment of Inertia of Alpine Skis

SCOPE
1.1 This test method covers test measurement methods for mass and moment of inertia of adult Alpine skis.  
1.2 No limitation to ski size is proposed. This test method is applicable to all adult Alpine skis.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Dec-1995
• Technical Committee: F27 - Snow and Water Sports
• Drafting Committee: F27.30 - Skiing and Snowboarding Equipment

Relations

• Replaced By: ASTM F1722-96(2003) - Standard Test Method for Determining Mass and Moment of Inertia of Alpine Skis
• Effective Date: 10-Feb-2003

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: F 1722 – 96
Standard Test Method for
1,2
Determining Mass and Moment of Inertia of Alpine Skis
This standard is issued under the fixed designation F 1722; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5.2 Fulcrum, for locating the center of gravity of the ski.
5.3 Time Measurement Device (stopwatch), accurate to at
1.1 This test method covers test measurement methods for
2 least 0.1 s.
mass and moment of inertia of adult Alpine skis.
5.4 Measuring Device, in accordance with Fig. 1, consisting
1.2 No limitation to ski size is proposed. This test method is
of the following parts:
applicable to all adult Alpine skis.
5.4.1 Clamping Device, A, consisting of two clamping
1.3 The values stated in SI units are to be regarded as the
fixtures. The top clamping fixture has a hole with a mark to
standard. The values given in parentheses are for information
locate the center of gravity and two additional holes at a
only.
distance, d , from the center mark for fixation of the filaments,
f
1.4 This standard does not purport to address all of the
B. The recommended dimension for d is 25 mm, and the mass
f
safety concerns, if any, associated with its use. It is the
of the clamping device shall be less than 0.1 kg.
responsibility of the user of this standard to establish appro-
5.4.2 Top Plate, C, with two holes separated by the distance
priate safety and health practices and determine the applica-
2d for the fixation of filaments, B. The plate, C, shall be fixed
f
bility of regulatory limitations prior to use.
on a stiff, horizontal beam.
2. Referenced Documents 5.4.3 Two Filaments, B, with equal lengths, l, that connect
the top plate with the clamping device. The ratio d :l shall be
2.1 ISO Standards: f
approximately 1:40. With the recommended dimension d 5 25
ISO 554 Standard Atmospheres for Conditioning and/or f
mm, and the length, l 5 1000 mm. The filaments shall be
Testing—Specifications
made of materials with low elongation and high strength (for
ISO 6003 Alpine Skis—Determination of Mass and Polar
example, tennis racket string and fishing line). The diameter of
Moment of Inertia—Laboratory Measurement Method
the filaments shall be not more than 1.0 mm.
3. Terminology
6. Sampling and Conditioning
3.1 Definitions of Terms Specific to This Standard:
6.1 In order to ensure comparability, it is recommended that
3.1.1 mass of ski, m—the mass of a finished, manufactured
one of the following ski sizes be used if the data measured are
ski without any mounted parts, expressed in kilograms.
to be published: 150, 180, or 200 cm. From these three sizes,
3.1.2 moment of inertia, I—the mass moment of inertia of
choose the one that is most representative of the tested model.
the ski about its center of gravity, expressed in kilogram-metres
6.2 All measurements shall be taken from a finished, manu-
squared.
factured ski without any mounted parts.
4. Significance and Use
6.3 All measurements shall be taken from a ski that has been
conditioned in a standard atmosphere 20/65 (ISO 554) (that is,
4.1 This test method provides a means for determining the
the ski shall be placed in this atmosphere for at least 24 h prior
mass and moment of inertia of adult Alpine skis. It is not
to measurements being taken).
intended to evaluate data with regard to the quality of the ski.
7. Calibration of Measuring Device
5. Apparatus
7.1 Differences in construction between the different mea-
5.1 Weighing Device, accurate to 60.02 kg.
suring devices can lead to different measurement results, which
deviate from the theoretical value of the polar moment of
inertia. In order to reduce such deviations, it is recommended
This test method is under the jurisdiction of ASTM Committee F-27 on Snow
that a test equipment validation factor, c, be determined for
Skiing and is the direct responsibility of Subcommittee F27.30 on Alpine and
Nordic Skis. each measuring device.
Current edition approved July 10, 1996. Published September 1996.
7.2 The test equipment validation factor is determined from
This test method is meant to conform in all significant aspects to the test
the ratio of the calculated moment of inertia to the measured
method for determining mass and polar moment of inertia of Alpine skis as set forth
in ISO 6003. moment of inertia of a bar of steel with dimensions 1 to 8 by
Available from American National Standards Institute, 11 W. 42nd St., 13th
Floor, New York, NY 10036.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
F 1722
test equipment shall be checked and broug
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