Gravity Defying Coin - Euler's Disk

Euler's Disk: (best with sound on) this toy exhibits the motion of a “spolling” coin, a motion that combines spinning and rolling. Designed with a large mass and a special smooth beveled edge, this device takes close to 3 minutes to come to rest- and amazingly, the contact point between the disk and the mirror can reach a speed of more that 200 mph! This video catches the first and last parts of this 2 minute and 42 second run, with two cuts to 240fps slow motion to show the curious motion. Watch the end with the sound on!

[odenkawasaki]

J'ai réussi 3 minutes ( seulement 1x ), 2 minutes 45 ( 1x ) et en général c'est entre 2, 15 et 2, 30 effectivement quand on l'actionne correctement.