Originally Posted by toly
Agreed, but first of all I said, “Let’s assume a player rotates straight arm around shoulder joint with locked bend back wrist in horizontal plane and without arm pronation, see please picture below.”
So, it very simplified version of reality, but I use that to demonstrate the main idea.
Sorry, I missed that. Even then, depending on the contact point, the racquet can meet the ball absolutely head on, tangential to the target line - even with ϕ not equal to zero. So my point holds. However, I'm afraid this example is without merit since nobody will hit in such a fashion...