Tennis Shot Maker

INPUT: BALL, RACQUETS, AND SWING

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Shot Inputs	Shot A	Shot B
Change input variables to compare different shots ( instructions)
Racquet: 1. Choose same racquet but different shot parameters to compare shots. 2. Choose different racquets but same shot parameters to compare racquets.
Height: Hitting height — For example, waist height is about 3-4 ft.	ft	ft
Ball speed: Speed into racquet. Typical speeds: 30 mph for groundstroke, 50 for serve return, 75 for volley, 0 for serving.	mph	mph
Ball angle: Angle (to court) of ball approach: 0 at top of bounce, negative if dropping, positive if rising.	deg	deg
Ball spin: Into racquet — always positive (topspin) unless volleying in which case it can have positive or negative spin. Typical spin off court is 1000 (slice) to 6000 (heavy top) rpm.	rpm	rpm
Racquet tip speed: Example: 80 pros FH, 65 college FH, 40 intermediate FH, or any speed depending on shot and player.	mph	mph
Swing angle: Racquet approach angle (measured from court). Upward swing positive; downward swing negative.	deg	deg
Racquet tilt: Forward tilt postive (typical 0-5); backward tilt negative (tilt measured degrees from vertical).	deg	deg
Impact location: Ball impact along center of racquet — 16 (throat), 19, 20, 21 (middle), 22, 23, 25 (tip) inches from butt. NOTE: A few racquets were not tested at 22 inches.	in	in
Court location: Where ball contact occurs. Baseline=0, inside (negative like -10), outside (positive like 5).	ft	ft

OUTPUT: TRAJECTORIES AND STATISTICS

**(Scroll up to change shot input variables)

Quick Summary

Distance:

74.0 ft.

73.7 ft.
Speed: yellow dot

73.0 mph

61.7 mph
Spin: yellow dot

1035 rpm

1787 rpm
Spin Window: yellow dot

6.07 in.

5.41 in.

Outgoing Shot Statistics	Shot A	Shot B
Racquet	Babolat Pure Drive Roddick	Babolat Pure Drive Roddick
Racquet Power Potential	39.9 %	39.9 %
Racquet Speed at Impact Location	51.83 mph	51.83 mph
Key Racquet Specs	Swingweight: 329 kg·cm² Twistweight: 14.93 kg·cm² Spinweight: 343.93 kg·cm²	Swingweight: 329 kg·cm² Twistweight: 14.93 kg·cm² Spinweight: 343.93 kg·cm²
Distance Stats
Distance to Bounce	74.0 ft	73.7 ft
Distance Comparison	A to B: 3.6 in	B to A: -3.6 in
Height At Net	6.0 ft	8.3 ft
Clearance At Net	3.02 ft	5.32 ft
Speed Stats
Launch Angle	7.9 °	13.8 °
Launch Speed	73.0 mph Horizontal: 72.3 mph Vertical: 10.0 mph	61.7 mph Horizontal: 59.9 mph Vertical: 14.7 mph
Speed at Bounce	45.6 mph Horizontal: 43.5 mph Vertical: 13.6 mph	37.2 mph Horizontal: 33.6 mph Vertical: 15.9 mph
Time To Bounce	0.90 secs	1.12 secs
Spin Stats
Incoming Spin	4000 rpm Top Spin	4000 rpm Top Spin
Launch Spin (assuming racquets with same string)	1035 rpm Top Spin	1787 rpm Top Spin
Change in spin	5035 rpm	5787 rpm
Spin Window MAXIMUM window opening onto the string landing runway without clipping frame (in or out) for the given shot and racquet (takes into account frame clearance height and stringbed width at impact point plus ball sliding distance on strings and impact and exit angles). How much difference does it make?	6.07 in. Location width: 9.84 in. Clearance height: 0.51 in. Ball slide: 0.95 in.	5.41 in. Location width: 9.84 in. Clearance height: 0.51 in. Ball slide: 1.10 in.
Spin Analysis: How Friction Works
Impact angle: Result of pre-impact angles and speeds of ball and racquet ("falling" measured from top half of string plane; "rising" measured from bottom half).	64.11° Falling	54.45° Falling
Speed and direction of ball BOTTOM: Speed relative to strings (greater absolute speed usually means friction lasts longer, though perhaps with less force).	65.26 mph Down	75.24 mph Down
Direction of friction force (always opposite the direction of the ball bottom).	Up	Up
Friction effect	Slow spin or reverse direction	Slow spin or reverse direction
Spin Rules For Increasing Spin
Weird Spin Stuff
Court dimensions: Court length = 78 ft; Baseline to net = 39 ft; Baseline to opposite service line = 60 ft; Height at middle of net = 3 ft; Service line to service line = 42 feet; Net to service line = 21 ft