I think it looks fine, what comes up though when I think of my stopmotion project of cartoons is that the problem is not the few frames but the lack of motion blur of such a fast swing.
You can animate a swordswing/fast car/flying thing with as many FPS as you want... but if there is not some sort of "motion blur" it will look phoney/fake.
Unfortunaly I could not find any cartoon example via Google Image Search and my mobile harddrive is still in Frankfurt, so I doodled it.
In Cartoons they often draw partial fragments of the moving thing, while in stopmotion movies they either use photoshop/psp/gimp or photograph a object in motion (I've seen some special photo/catapult-construction for that, neat...)