Advanced/Simple Flight Models This aircraft comes with a simplified flight model which limits the total aircraft weight to approximately 220,000 pounds by reducing the total amount of fuel available. It also is configured to have electric power always available. An advanced flight model is available in the "advanced" folder which enables a full fuel load and allows for electrical failures. Copy the file named "aircraft.cfg" from the "advanced" folder into the main aircraft folder entitled "Alpha B-1B Lancer", overwriting the existing "aircraft.cfg" file, to enable the advanced flight model. With the advanced flight model, the electric power will drain very quickly if the engines are off or the generators are shut down. The aircraft will also be very heavy so keep this in mind during takeoffs; the rotation speed is about 160 KIAS with a full fuel load.