Possible to increase rate of rotation over time?

I need to simulate something similar to the effect of a car wheel rotating, strictly in 2-D, a totally flat side-view. The complication is that I need the "wheel" to be stopped at first, then slowly ramp up speed over time until it reaches a maximum rate. Is it possible to increase the rate of rotation over time? I have tried creating a constant-rate rotation, then exporting as a Quicktime and applying a speed ramp to the mixdown. This looks terrible.
Any thoughts? Thanks in advance.
Also, I may post this over at the FCP board, in case anyone there has an idea.
John

Actually, that's not true for FCP or Motion. You can set a keyframe at 0 rotation, and then another at the point where you want the rotation to be a full speed and a third keyframe at the end of your animation. Then just right-click the 1st keyframe in the keyframe editor and choose Interpolation: Bezier.
From there, it's just a matter of adjusting the curve until you have the ramp that you're looking for.
In FCP, you can add keyframes in much the same way in the Motion tab. Then you right-click the 1st keyframe and choose Smooth from the menu. This will give you a bezier handle that you can adjust to create a ramp.
I suggest using Motion though as it's a little easier to add and adjust keyframes.
Andy

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