stormcloud,
What do you mean by "datum?" On all Boeing airplanes I've flown, the "datum" when talking about the center of gravity (CG) is a point slightly ahead of the nose of the airplane from which all calculations for the location of the CG are made. Are you refering to the locations of the CG and center of pressure (CP)? Regards.. . <img src="cool.gif" border="0">