Read up on the PDCS too. That will help you make sure you are giving the correct power settings for take-off/climb/cruise...Did you change any settings in the aircraft cfg in respect to the -9,or -15 engines either? If you are using the -9's, its going to take a few more feet of runway compared to the default -17's power. If you don't know what I'm talking about here either, read up the different engine setting configs :).This is not just a "fire up and fly" aircraft. You will have to do a little work to get it to fly by the numbers.gp