Wilson Pro Staff 97L Countervail

The Pro Staff 97L Countervail looks just like the one Federer uses, complete with the same cosmetics, laser engraving and chrome touches. However, this one is much lighter and more suited for the "mortal" user as opposed to the "super human" type like Federer. The Countervail version offers a material technology designed to reduce impact vibrations and muscle fatigue so you'll just have to hit it to see if you can find Countervale's magic. This racquet has some pretty good stability given the fact that it comes in at a weight of just under 10.8 oz. and the cosmetics are impressive, giving you the feeling that you're wielding a super sonic light saber with black cosmetics straight out of Star Wars. Everything I've been seeing about this racquet is always referring to "lightweight" but IMHO, this isn't a lightweight frame. It's just a lighter version of the RF97 that Federer uses. I'm typically inclined to keep racquet recommendations above 10.5 oz. if at all possible, particularly if the player can handle it without feeling encumbered. In the world of tennis racquets weight is your friend so the more the merrier.

Racquet ModelWilson Pro Staff 97L
Reference Tension56
StringAshaway MonoGut ZX Pro
Machine Strung onWilson Baiardo
Static Data
ASPS, FlexFour55
Racquet Flex, RDC65
Racquet Flex, FlexFour60
Weight, Gram306
Weight, Ounces10.79
Balance, mm335
Balance, In13.19
Length, Cm68.58
Length, In27.00
Head Width9.39
Head Length12.70
Head Area,Cm604.3
Head Area, Sq. In93.7
Number of Main Strings16
Number of Cross Strings19
Ratio Cross/Mains0.623
Main String Grid7.60
Cross String Grid10.30
Average Cross String Spacing0.542
Average Main String Spacing0.475
Dynamic Data
Dynamic Tension, Kp, ERT36
Dynamic Tension, Lbs/In201.35
First Moment, Nm0.795
Polar Moment325
Torsional Stability13 (the difference between polar moment and swing weight) the higher the better.
Swing Weight, Gram312
Swing Weight, Ounce11.01
Swing Weight Calculated343.4
Power, RDC45
Control, RDC57
Maneuverability, RDC79
Power, Calculated1899.4
Head Points2.49 (negative number = head heavy)
Head Weight %48.8 (% weight distributed toward head)
Center of Percussion21.0 (location from the butt to the point creating minimum rotation on ball impact)
Dwell Time, Ms8.35
Effective Stiffness30.7
K, lb/in185.90 (weight required to deflect string bed 1 inch)
Recoil Weight145.30
Twist Weight202.99
Written by Tim Strawn

Executive Director, IART

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