Everyone knows that ISOMETRIC means "having equal dimensions or measurement". I can not see any length, I guess somewhere around frame, are isometric.
This is a marketing term. It doesn't really mean isometric in any strict mathematical sense. The more rectangular isometric head shape decreases the length difference of the strings. That is, all (non-peripheral) cross strings become slightly more equal in length, and the same goes for all (non-peripheral) main strings. They say this creates a bigger sweet spot and evens out string tension. (By the way, has anyone ever seen any scientific proof of this? Does it REALLY create a bigger sweet spot?)
"sweet spot" usually means "the area of the racquet face that transfers more of the force of the stroke (and/or more control) than other areas," IMHO. So, how does uniform string length and tension contribute to this effect? The problem is to specify the physical characteristics of the racquet face that will produce the functionality noted in the definition I attempted. Does anyone know of any engineering studies on this topic? Maybe the flexing and rebound of the strings makes the racquet face act like a trampoline.
I certainly know nothing about the mathamatical and scientific facts on this topic but i can say that Isometric rackets have a larger sweet spot because of its enlarged frame size