Wave Pendulum Mechanism
grabcad
Based on a YouTube video https://www.youtube.com/watch?v=RrX2yTGJ6N0, from "Grand Illusions" channel, https://www.youtube.com/user/henders007. They have amazing videos about toys, physics and many other things. The shortest pendulum realizes 69 oscillations/minute; the next 68 and so on; the longest realizes 57 oscillations/minute; after 1 minute they are all in the same position as at the beggining. Professor Constantin STANCESCU published a similar model some time ago. You can see it here: Uneven pendulums. He already gave all possible explanations about it. The "Analysis" picture shows a table with properties of each pendulum: length, Inertia, Mass, Period and Frequency.
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