War of Currents Update
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Been too long. Lazy. Ain't like anyone is be reading this.
TSLA technically in the lead if there were no dividends.
7 years ago
When the string bed of each racket is struck, both should ping at precisely the same pitch, indicating the string tension is identical. But Heydt’s were slightly off.A Speed-of-Serve Snapshot
“I could hear it right away,” he said. “Yat said, ‘Your tensions are different. These may be one pound off, but this is unacceptable.’”
But how is that 148 miles an hour determined? Rallis Pappas, president of Information & Display Systems and a U.S.T.A. consultant who works in the IBM Statistics room at the Open, says it’s not as simple as putting a radar gun on the court. “It’s Doppler radar, but there’s a lot of software that’s part of the system,” Pappas says. “We really refer to it as a serve speed system because of that.”
As he elevates off the court to create the split step, watch how he opens his right foot slightly when he sees that the ball will go to his right. This makes for a quick move toward his forehand. When landing on the split step, he quickly pushes off with his left leg and makes a final stride with the right. Notice the exaggerated heel-to-toe foot placement. Federer does this to maintain good balance, as the heel-toe foot strike allows him to slow the acceleration of his body and position himself for the shot.Second, a piece on some of the top women's players, and their service troubles. An excerpt:
The serve and the free throw share key components: foot placement; body balance; weight shift; toss and follow through. Misses happen when players’ minds are willing but their mechanics are weak, or vice versa.Update 2009/09/04: The Wills, Arnett and Ferrell, joined the Andys, Roddick and Murray, on court for a celebrity doubles match, with SNL's Kenan Thompson as the "umpire", to do pretty much the opposite of what Roger Federer does: