ORIGINAL: Pongo
No, it was actually going to the right, and far harder than the usual drift. Without correction it would have rolled right over or had a blade strike (to the right) before lifting off.
I gave the trim an adjustment to the left, about half way and things were good. This was just fine centered before, so something is not right or changed. Once I moved the trim over things seemed normal.
Hard right drift...no apparent reason...check and make sure your servos are all operating full range. My first suspicion is a faulty servo. If you changed nothing and all a sudden it does that...SERVO. Sometimes they will operate, but are stripped at a certan point and don't fully cycle the full range. I was going to tell you to adjust servo ball links...but that is not the problem here. A semi-stripped servo will drive you nuts trying to find it. When you apply throttle and one servo is not pulling the load, this will cause things to shift....seen it. Let me know.