Hope someone can help me here. I have spent the best part of 30Hrs on the simulator so I am fairly comfortable getting around with that at least. I took out the F550 and when applying throttle it began to skate prior to lift off. I am afraid to push it for fear of crashing immediately. I have checked that the props are rotating correctly and fitted correctly and that the adjustments for trim is centered. All looks OK. Here is a video: http://www.youtube.com/watch?v=Vcv3ezSC9-U