Die Rodrigos, motorbike looping / Motorrad / лопинг с мотоциклом, 1973

NdP, 1973. Featuring singer Vera Schneidenbach
I've made a rough estimate of the centrifugal acceleration. The distance between the axis of rotation and the motorbike's seat is estimated to be approx. 3.5 m. The smallest period of rotation is 1 second. This yields velocity 22 m/s or 80 km/h. This is close to the number said by the host: he said up to 100 km/h. This velocity and radius yield centrifugal acceleration 14g! Even if I take the radius 2 m instead of 3.5 I come to 8 g - still a very high value. Especially for a person who sits in a relatively uncomfortable position on a motorbike. Later when the lady rides the bike her rotation speed is apparently lower, the period of rotation is around 2 seconds. That is, centrifugal acceleration 3.5 g. Still a high value for an untrained person. At the very end of the video one can see that she is about to collapse. The disturbance of blood circulation due to acceleration could be the reason. It must be the main problem of this act that if the speed and acceleration get too high the rider may fall unconscious.
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I've made a rough estimate of the centrifugal acceleration. The distance between the axis of rotation and the motorbike's seat is estimated to be approx. 3.5 m. The smallest period of rotation is 1 second. This yields velocity 22 m/s or 80 km/h. This is close to the number said by the host: he said up to 100 km/h. This velocity and radius yield centrifugal acceleration 14g! Even if I take the radius 2 m instead of 3.5 I come to 8 g - still a very high value. Especially for a person who sits in a relatively uncomfortable position on a motorbike. Later when the lady rides the bike her rotation speed is apparently lower, the period of rotation is around 2 seconds. That is, centrifugal acceleration 3.5 g. Still a high value for an untrained person. At the very end of the video one can see that she is about to collapse. The disturbance of blood circulation due to acceleration could be the reason. It must be the main problem of this act that if the speed and acceleration get too high the rider may fall unconscious.