Originally Posted by maxpotapov
On a high speed camera you can see how mains are sliding on impact if you hit a top spin shot. That means, the ball slides first and then displaces the mains. When mains snap back, they launch the ball back at certain angle. All of this takes time, dwell time.
The sharper the poly, the longer it can be pushed by the ball if the cross string is sleek enough. It takes less effort to displace natural gut due to high elasticity, especially on a sleek cross string, hence you can get quite a spin from the smooth natural gut string, but not from the smooth multi (not enough elasticity to easily slide back and forth).
hope you donīt mind if i join the discussion
if i understand you correctly, your point is that the smoother the strings are, the more topspin they produce? provided they snap back(poly more so, multi less)