Near the end of its motion, the Euler’s Disk can reach up to 100 revolutions per second, with rim speeds exceeding 10 meters per second, depending on its mass and radius. The sound you hear isn’t from spinning, it’s from wobbling. That rising pitch comes from precession: the disk's axis tracing a tight, rapid circle as the tilt angle decreases. The wobble frequency can reach 150 Hz or more, creating that unique, rising tone. Euler’s Disk is named after Leonhard Euler, whose equations describe th