I did the heavy flight again, and this time took the screenshots just after TOC and just after landing. One thing I didnt notice before was the optimal flight level being so high for a fligh so short, I dont thing I may get FL340 and get down on 29 min flight, am I thinking right?
FMC gives 144 flaps 30 for 55.3 tons. Vref for this flap and 55 tons is 141, so 144 seens reasonable for what the FMC gives. So 144 + 5 knots = 149 knots, however performance tab gives 115 knots.
tnks again man!