It does produce nice spins.
The racket brushes upwards.
The ball's rotation stops and reverses.
Spin is created when the ball rotates at the same rate as the racket head.
After that, they are spinning the same speed.
Rough strings simply reverse the balls spin sooner, but can not increase the rate of spin.
The ball simply can never spin FASTER than the object imparting the spin in the first place.
But, don't take it from me, take it from
Howard Brody is an emeritus professor of physics at the University of Pennsylvania
Rod Cross is an associate professor in physics at the University of Sydney, Australia
https://www.amazon.com/Technical-Tennis-Racquets-Strings-Courts/dp/0972275932
The reason the roughed/dented/uneven string results in more spin, is because the energy to the ball is re-transfered over less string surface in a skitting bumped fashion. The uneven strings flips/flick on the ball like this basket baller on the rubber ball before release.Again, use your common sense.
It is physically impossible for a rough string to add spin.
Do you think the ball would spin faster if he wore a gardening glove?
Not being around the forum when this was first posted, and not about to read through the thread, I’d say it makes sense that racquet head speed sets a limit to how much spin can be imparted. But then it’s up to the string to actually grab the ball. The rougher the string the more able you are to approach that limit set by your racquet head speed.The racket brushes upwards.
The ball's rotation stops and reverses.
Spin is created when the ball rotates at the same rate as the racket head.
After that, they are spinning the same speed.
Rough strings simply reverse the balls spin sooner, but can not increase the rate of spin.
The ball simply can never spin FASTER than the object imparting the spin in the first place.
But, don't take it from me, take it from
Howard Brody is an emeritus professor of physics at the University of Pennsylvania
Rod Cross is an associate professor in physics at the University of Sydney, Australia
https://www.amazon.com/Technical-Tennis-Racquets-Strings-Courts/dp/0972275932
It's mostly the angle of the racket head at impact vs the angle of the ball coming in that determines spin. The rougness has softenend up most strings and provides some more elastic flex than its non-roughed brothers.....The roughness gives better traction/grab on the rubber ball. so the roughed strings catches better the ball... and that helps a tiny little bit with trajectory and spin because the roughed versions are better at stopping the incoming spin thus giving more time to re-spin going out the stringbed....The shaped versions bite more into the ball thus provides the spin better after the stringbed has stopped the ball going in.Not being around the forum when this was first posted, and not about to read through the thread, I’d say it makes sense that racquet head speed sets a limit to how much spin can be imparted. But then it’s up to the string to actually grab the ball. The rougher the string the more able you are to approach that limit set by your racquet head speed.