Motions of two disks look similar but in fact totally different.
1. Brown disk (swashplate) is rotating. A point R on its periphery rotates. Its distance to the ground is constant. Its locus is a circle in the horizontal plane.
The brown disk is fixed inclinedly on a rotating shaft. See its application:
http://www.youtube.com/watch?v=dafYYCBo4VU
2. Blue disk is wobbling. A point W on its periphery goes up down, so its distance to the ground is varried. It is possible to consider that point W oscillates arou
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