Contact on an incoming top spin ball - speed, rotation and angles at 1500 fps

The physics of table tennis are difficult to understand at regular speed. Contact is very short - our tests show significantly less that 1/1000 sec -, but during that time a lot of energy is transferred - first from the ball into the rubber and then from the whole racket back into the ball. Angles, speeds and rotation determine the resulting ball trajectory, and the player must perform the stroke within a very tight tolerance to execute a successful shot.
The use of a super-high frame rate camera allows us to understand things a little more clearly.

[@caskal]

Excelente video Diego! Soy Ezequiel

[@UjjwalSidhu]

O.O this is good stuff

[@chicotabletennis1]

Great content! Do you have more of these ultra slow motion? Can we talk?

[@mauricecatayan3406]

Thank you for the video. The stroke looks like a drive or counter hit, given the big difference between the racket angle and its trajectory. I'm surprised that despite this, the outgoing shot still has so much rotation.
Could you shoot FH and BH loops and counterloops?
This video and the other against underspin contrast with what I observe in super slowmotion videos of Chinese players. Their racket trajectories are much closer, if not almost matching the racket angle.

[@slonski]

hey! awesome video! have a question: how did you estimate RPM? seems like for this kind of videos it might be great to use balls with dot marks to be able to calculate spin speed.
UPD. oh, there's a dotted ball in your other vid ))

[@DiegoTTTube]

Actually, although not quite clearly visible on RUclips, the ball does have dots. The original footage is darker and shows the dots. The video has been brightened for RUclips to show the player better. But, yes: Dots are the most reliable and accurate way to calculate spin since we know the frame rate.

[@brooks9431]

🌺 'Promosm'