haha obviously notYou mean they DON'T use a big crane and do a SWING TEST???
thanks for answer, I'm really appreciatedWhen we prep the Antares for launch, we have to report the weight and location of every component added so the CG can be calculated, among other things.
I'm not sure how CP was calculated. Probably either a wind tunnel model or calculated with a method not too dissimilar from barrowman.
CP only matters for a minute or two though until the vehicle reaches the upper atmosphere. With active guidance, CP only needs to be known for the sake of knowing how much torque the gimbaling engines need to apply to cancel out any natural tendency to flip over resulting from the lack of fins.