On May 24, 10:53*pm, "Matt Herron Jr." wrote:

The problem arises from a difference in the way Europeans and
Americans calculate the CG.

The formula provided by Schleicher for the ASW 28 recognizes that the
position of the main gear relative to the leading edge datum changes
with the mass of the glider. An accurate CG determination for this
glider, and any other with sprung main gear, requires that the
position of the main wheel is measured at the mass used for CG
determination and with the glider at the specified pitch attitude.

Andy (GY)