Increasing the aircraft mass also affects most of the factors associated with the CG, particularly fuel consumptiona and stalling speed. An increase in weight requires increased lift, more lift equals more drag and more drag means higher fuel consumption. Increasing mass also affects the stall speed, VS, which is roughly proportional to the square root of weight.
Many speeds used in performance calculations, such as the rotate speed, VR and the safety spped, V2, are extracted through graphs and tables and are based on the stalling speed from which they differ by a standard safety margin according to the rules and regulations. So, they also increase as the aircraft weight increases, so as to keep the safety margin constant.
In case an additional baggage container is loaded into the aft cargo compartment without being entered into the load and trim sheet, then the VS will increase, but the take-off safety speeds will remain the same, thus reducing their difference from the VS and as a result the safety margin will also reduce.
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