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ASTM F1880-09

Historical Revision

Standard Test Method for the Determination of Percent of Let-Off for Archery Bows (Withdrawn 2022)

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1.1 This test method covers the procedure to be used to determine the percent of let-off for archery bows.

1.2 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.

This test method covers procedure to determine the percent of let-off for archery bows. Percent of let-off shall be determined from formula using force-draw curve. Other factors for percent of let-off determination include hysteresis effect and rating conditions.


It is recognized that certain designs of the cams used in the compounding systems of archery bows cause variation in the percent of let-off with change in draw length, draw weight, or both. This is true particularly with the style of cam that achieves draw length adjustment by effectively altering the length of the shooting string by any of several methods. In this case, the mid-draw length and the maximum draw weight obtainable (but not to exceed the maximum rated weight of the bow) shall be used to determine the official percent of let-off for the bow in question.

Historically, two methods have been in use to establish the percent of let-off for archery bows. The most common method uses the peak draw force and the minimum holding force read from the force-draw curve to calculate the percent of let-off. The second method uses the peak draw force from the force-draw curve and the minimum holding force from the let-down curve for this calculation. This test method defines the two methods and distinguishes between them.

SDO ASTM: ASTM International
Document Number F1880
Publication Date Nov. 1, 2009
Language en - English
Page Count 3
Revision Level 09
Supercedes
Committee F08.16
Publish Date Document Id Type View
Nov. 1, 2013 F1880-09R13 Revision
Nov. 1, 2009 F1880-09 Revision
April 10, 1998 F1880-98E01 Revision
April 10, 1998 F1880-98 Revision
May 1, 2004 F1880-98R04 Reaffirmation