Right now I just keyed the rotation, and set it to +360 degrees at the end of the sequence.
Now the issue is :
They want the rotation to start up slow, pick up speed, and then slow down again on the 'turning points'.
Is there any way to accomplish this? I do not want to do it by building a delay in the excisting frames, as that is just plain ugly (imho). but the calculations for each frame seem a little daunting as well...