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Old 08-06-2013, 07:30 AM   #54
sureshs
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Join Date: Oct 2005
Posts: 32,051
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Don't know how to paste the graphs here, but go to http://twu.tennis-warehouse.com/lear...ajectories.php and click the boxes for racket swing angle and racket tilt for spin out column.

FOR A TOPSPIN STROKE

The greater the swing angle, the greater the spin out.

Other Effects: Greater swing angle also produces less speed out and a higher launch angle. The distance inceases for a while but begins to decline as the trajectory becomes more and more vertical (see other graphs in the Swing Angle row).

Spin out is increased by greater ball speed in, racquet tip speed, swing angle, racquet tilt, and impact more toward the tip.

Spin out is decreased by greater ball spin in and a greater ball angle in. (See other graphs in Spin Out column.)

FOR A TOPSPIN STROKE

The greater the forward racquet tilt, the greater the spin out.

Other Effects: Greater tilt also produces less speed and lower launch angle. The result is shorter shot distance (see other graphs in the Racquet Tilt row).

Spin out is increased by greater ball speed in, racquet tip speed, swing angle, racquet tilt, and impact more toward the tip.

Spin out is decreased by greater ball spin in and a greater ball angle in. (See other graphs in Spin Out column.)


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Racket tilt change from 4 degrees to 10 degrees can change RPM from 940 to 1500.
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