https://doi.org/10.1140/epjp/s13360-021-01732-1
Regular Article
Beer mats make bad frisbees
1
Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Nussallee 14-16, 53115, Bonn, Germany
2
Bethe Center for Theoretical Physics, University of Bonn, Nussallee 12, 53115, Bonn, Germany
3
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany
4
Argelander-Institut für Astronomie, University of Bonn, Auf dem Hügel 71, 53121, Bonn, Germany
Received:
17
June
2021
Accepted:
3
July
2021
Published online:
24
July
2021
In this article we show why flying and rotating beer mats, CDs, or other flat disks will eventually flip in the air and end up flying with backspin, thus, making them unusable as frisbees. The crucial effect responsible for the flipping is found to be the lift attacking not in the center of mass but slightly offset to the forward edge. This induces a torque leading to a precession towards backspin orientation. An effective theory is developed providing an approximate solution for the disk’s trajectory with a minimal set of parameters. Our theoretical results are confronted with experimental results obtained using a beer mat shooting apparatus and a high speed camera. Very good agreement is found.
© The Author(s) 2021
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