Tare weights - Minimal Paint - 40 hours endurance
fotoguzzi - I think I know what you are driving at. 40 hours fuel - Not on this aircraft. Minimal paint - irrelevant in this instance. Tare weight - I guess you mean Aircraft Empty Weight. Mate, the problem occurred because an error was made in entering the Takeoff weight and from that error the resultant V speeds were incorrect and a lower than required thrust setting for takeoff was used. No rocket science, just an undetected error made which had the potential to cause a much worse outcome. I recommend the post by mensaboy to you, it is well thought out and makes a lot of sense, to me at least.