No apology needed, just don't understand what the statement had anything to do with the topic.

It's perfectly obvious that twistweight is not the only spec that affects a racket's maneouvrability. Goes without saying. But this thread is about twistweight, so it makes sense to discuss how twistweight alone affects maneouvrability.

Believe it or not I was trying to explain how twist weight affects maneuverabilit. I guess I did a poor job of doing that. Shame on me, let me try again.

Inertia is the property of matter which makes that matter continue in its existing state. If the matter is at rest it will try to continue to stay at rest, and if the matter is in motion it will continue to travel in a straight line unless acted upon by some outside force. Let's look at how 5 g of mass reacts when it is attached to a point at 3 o'clock on a tennis racket. And let's assume that mass is 8.5 cm from the perpendicular distance to the center of the racket, and 42 cm to the perpendicular distance to a line that is drawn perpendicular to the 10 cm axis for swing weight. Inertia is additive so my adding that 5 g of mass I will increase the TW by (0.005*8.5*8.5 = ) 0.36125 kgcm^2 and the SW by (0.005*42*42 =) 8.82 kgcm^2. So if I twist the racket around the centerline the inertia I must over come is the initial TW of the racket plus 0.36125 kgcm^2 inertia of the 5 g mass. And if I can find a way to rotate the racket around the 10 cm line drawn perpendicular to the centerline I must over come the initial SW of the racket plus 8.82 Kgcm^2 of the 5 g mass.

But still that dos not explain it all that 5 g of mass is (sqrt((8.5*8.5)+(42*42)) or 42.85149 cm from the 10 cm point on the centerline of the racket. So the inertia of that mass is (0.005*42.85149*42.85149 =) 9.18128 and it just happens that the TW + SW of that 5 g mass is (.36125 + 8.82 =) 9.18125 kgcm^2.

To wave that 5 g of mass around you 10 cm point takes 9.18126 kgcm^2 of torgue. The higher the SW + TW is the higher the inertia the less maneuverable the racket is the lower that total inertia the more maneuverable that racket is. Unless of corse if you can find a way to play tennis by twisting the racket just around the center line or the 10 cm axis.

Inertia is inertia and it is all additive. Increase the TW or SW of a racket and it is less maneuverable.

EDIT: Granted we don't rotate the racket around a 10 cm point either but that's another thread.

EDIT: The importance of TW is stability on off center shots and how fast you can pronate (twist) the racket on the serve when you snap through the ball.