7140 (ISO International Standard INTE RNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAR OPrAHM3ALWA HO CTAHAAPTM3ALWV-ORGANISATION INTERNATIONALE DE NORMALISATION Cross-country skis - Determination of dynamic performance - Laboratory measurement method Skis de fond -- Deétermination des performances dynamiques -- Methode de mesurage en laboratoire First edition -- 1985-10-15 UDC 685.363.2 : 620.174.2 Ref. No. 1SO 7140-1985 (E) 1985 Descriptors : sports equipment, skis, cross country skis, dynamic properties, tests, flattening tests. 7140-1 Price based on 4 pages ensefromIHS Not for Resale Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IsO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7140 was prepared by Technical Committee ISO/TC 83, Sports and recreational equipment. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. ? International Organization for Standardization, 1985 Printed in Switzerland Not for Resale itted without license from IHS INTERNATIONAL STANDARD ISO 7140-1985 (E) Cross-country skis - Determination of dynamic performance - Laboratory measurement method Scope and field of application References 2 This International Standard specifies a laboratory measurement Iso 554, Standard atmospheres for conditioning and/or testing method for determination of the dynamic performance of Specifications. cross-country skis. The purpose of the test is to determine the residual camber height and length as a function of the load. ISo 6289, Skis -- Terms and definitions. Another name for this measuring method is "flattening test". The graphs (for examples see figures 2 and 3) which are ob tained according to this test are mainly intended to be used by Terms, symbols and definitions specialists but may also be of some use for the consumer in 3 selecting a ski with appropriate stiffness. For the latter purpose, two parameters which in a simplified and less stringent way For the purpose of this International Standard, the definitions give some of the information obtained by this test, can be of Iso 6289, and the following, apply. extracted from the graphs. These parameters are the "contact load", which is a measure of the minimum residual camber height, hrF: Distance measured at the 3.1 load necessary to bring the centre part of the ski in first load application point P, 8 cm behind the binding mounting contact with the snow. If the ski is loaded with a higher load point between the running surface of the ski and a flat horizon- than the contact load, the frictional properties (during tal surface when the ski is subjected to a load, F (see figure 1). gliding and kicking) of the centre part of the ski will influence the ski behaviour significantly. For lower loads, Examples: The magnitude of load F can be from zero up to the central part of the ski base will have a minor influence on contact load: the friction; hR294 is the residual camber height when the ski is the "standard camber length", which is a measure of loaded with 294 N; the length of the ski base which is not in firm contact with hro is the camber height when the ski is loaded only su