How can a pilot not know just by looking at his FOB/Pax count/Belly load what his GTOW is within a few hundred KG? Is nobody giving the V speeds a "smell test"? ie, does this smell OK? The last one like this I heard about was two management pilots who didnt think that 45kts between V1 and Vr smelt a little fishy {normall max on this aircraft 11kts max} The result, a badly bent tail skid. Time to get back into the loop and have a good handle on roughly what the GTOW should be given the load and fuel.