QUOTE(Piltdown Man @ Dec 10 2007, 07:24 AM) [snapback]123514[/snapback]
First things first. We are talking about wing loading here. During all stages of flight un-accelerated (1g) flight the lift generated by the wing equals the weight of the aircraft. However, it also produces a little bit more lift to account for the "negative" lift poduced by the tailplane (called trim drag) - required to make the aircraft stable in pitch.
hence the usage of pitch trim. Then there is the weight of the plane which decreases as the plane flies, fuel is been burned too, so the number changes all the time, if you measuring it to 1 decimal place then it will change often, in incriments usually, unless there are winds and turbulence about, darn turbulence.