Using different tension for mains and crosses?

[Irvin]

Originally Posted by tennisnut123

Even more so that a polyester? If the spin is mainly from the ball hitting the strings, moving the mains and the mains resetting back into their position, wouldn't that imply some stretching of the mains? I would think that a main string can only shift so much before it starts to stretch, and the more it stretched then reset the more spin it would get. Im probably thinking of this in a completely wrong manner but I would think the Polys have a greater stretchability than the kevlar right?

Polyester isn't even close. You are assuming the snapping back of the mains puts spin on the ball. Nothing puts as much spin on the ball as a hard court does and there is no movement in the court at all.

[Irvin]

Originally Posted by COPEY

This is one of those claims that I suspect could be more myth than fact, something that was passed on years ago that's managed to survive the test of time because it's still being touted as fact. My only problem is with all the data on discussing the three sweet spots on racquets, how they affect game play, power, etc., I've yet to come across anything that says lowering the tension on the crosses definitively enlarges the sweetspot. That doesn't mean the info isn't out there (for or against); it just means I haven't found it. If someone else has or does, by all means pass it on. I'm not trying to start an argument, so please don't misinterpret my post. I'd just like clarification.

In the book "The Physics and Technology of Tennis" the only way to move the sweet spot is to add weight.