dragchute
I think 212man was talking to me then!
212man
Sorry, just stirring a little bit, nothing serious!
While I'm here though, you said:
"Alternatively, take your a/c on the ground, with the wheels on scales, and get a load of tame geese to fly into the cabin through an open door. Do you think the weight on the scales will rise with each goose entering? Then close the door, no change. Then get the pilot to ask over the PA that all the geese kindly stop flying and sit down. Then the weight will rise."
So you're saying that should the geese begin to fly again (with all doors and windows closed) the weight will decrease? By the weight of the birds, or are you going to put the change of CoM in there as well? You just described a closed system and said the wieght will change when the geese land.
Is this in the original question (no open door or window) or in your scenario where you opened the window?