Wilson Jack Kramer Pro Staff New

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  • John Albert Kramer was an American tennis player of the 1940s and 1950s. A World No. 1 player for a number of years, and one of the most important people in the establishment of modern men’s “Open”-era …Wikipedia

    Jack Kramer in Action, sort of.

    Jack Kramer in Action, sort of.

  • FYI Racquet Museum is located about 10 miles from Rollins College from where Mr. Kramer graduated.  I go there often for tennis purposes.  Anyway…
    This racquet represented the very best performance racquet of that era, followed by the Jack Kramer Autograph, Slazenger Challenge No.1, and Dunlop MaxPly.  This racquet, however, is one of the best examples of craftsmanship.
    As you will see, in the data later on, this racquet was a hand full!  Heavy and flexible which produces a low power combination.  To get the most from this racquet you must be able to generate your own power, which, as you know, is weight and velocity.  You may also remember that there were very few arm issues, way back, in those days.
Manufacturer
Wilson
Racquet ModelWilson Jack Kramer ProStaff
Reference TensionNot Strung
StringNot Strung
Static Data
ASPS, RDC0
ASPS, FlexFour0
Racquet Flex, RDC35
Racquet Flex, FlexFour40
Weight, Gram363.4
Weight, Ounce12.82
Balance, mm331
Balance, Inch13.03
Length, cm68.9
Length, Inch27.12
Head Width8.13
Head Length10.90
Head Area, sq cm448.8
Head Area, sq in69.6
Number of Main Strings18
Number of Cross Strings20
Ratio Cross/Main0.671
Main String Grid6.20
Cross String Grid8.50
Density0.758
Average Cross String Spacing0.425
Average Main String Spacing0.344
Dynamic Data
Dynamic Tension, KP, ERTNot Strung
Dynamic Tension, Lbs/inNot Strung
First Moment, Nm0.930
Polar Moment337
Torsional Stability9
Swing Weight, Gram328
Swing Weight, Ounce11.57
Swing Weight Calculated398.1
Power, RDCNot Strung
Control, RDCNot Strung
Maneuverability, RDC
Not Strung
Power, Calculated814.1
Head Points4.25
Head Weight, Percent48.0
Center of Percussion19.3
Dwell Time, MsNot Strung
Effective StiffnessNot Strung
K, lb/inNot Strung
Recoil Weight136.76
Twist Weight184.67

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