Is there -any- Poser defined motion besides the rotor on the huey's body (that includes any unintentional camera or lighting animation)? Playing with various BVH files, I've noticed the Mover seems to do a sequential read of the axial displacement in a frame, not a simultaneous one. This doesn't seem to usually be a problem, but if you have values that shoot to the extreme, you get some interesting glitches. =Very= nice for a first attempt, though; choppers can be difficult to get right. What I saw: 1)The tail rotor is spinning far too slowly. To the naked eye, it would be all but invisible; that's why they put the funky stripes on it. Same with the main rotor tips. 2)Your center of mass is off a bit. Helicopters are funky in that regard; all the weight is in the body, but all the force pushing it around is from the rotors. There's actually an imaginary point floating in the fuselage, just under where the main rotor is, that would be the actual 'hip' of the vehicle. When you maneuver to any great degree, this point is the one that all the forces pivot around. A bank to either side would have the rotor tilting the proper direction, but the chopper body also tilts in response to conservation of momentum. That null point is actually where a simple path should be attached. Of course if the main rotor on the chopper can't tilt, there's not a lot you can do about it...