A Wilson RF 01 300 Extended

We want to share the specifications of an extended (70.0mm/27.559) Wilson RF 01 300.

The lengthening process involves removing the staples holding the butt on, which needs to be done carefully for the integrity of the foam pallet, before proceeding with the next steps.

Any time the butt cap comes off a racquet, the first step is to fill the open shaft with a stopper, preferably cotton, to the desired depth for fitting or protection.  If the racquet is “foamed” some of it is removed.

Numerous small details go into the extension we design and print, so we will not go into all of those right now.

The area that will accept the extension is filled with a new two (2) part epoxy made by Starbond.  This epoxy is nearly fully cured after several minutes; however, we prefer to let it cure overnight before proceeding with any other work.

After the curing cycle, the butt cap is installed.  We do not use staples in most cases, only a chemical adhesive.  Staples can easily damage the original foam pallet and the extension if the location is not ideal.

If you make it to the end of this data table, you will find some comparison data.  This data is a glance at what has changed from the original 27-inch length.  This is a specific racquet, so your specifications, if extended, may differ.

This is enough small talk, so let’s take a look at the results of the extension.

ManufacturerWilson
Racquet ModelRF 01 300 Long
Reference Tension56
String
Wilson Duramax NXT
Machine UsedBaiardo
Static
String Bed Stiffness - RDC47
String Bed Stiffness -FlexFour57
Strig Bed Stiffness - SBS50.4
String Bed Stiffness - ERT32
Racquet Flex, RDC62
Racquet Flex, FlexFour50.4
Racquet - In Plane Stiffness450.6
Weight, Grams355
Weight, Ounces12.52
Balance, mm314
Balance, Inch12.36
Length, Cm70
Length, Inch27.559
Head Width9.70
Head Length12.80
Head Area, cm2629.1
Head Area, Sq. Inch97.5
Beam Height @ Grip, mm23
Beam Height @ Mid, mm23
Beam Height @ Tip, mm23
Beam Width @ Grip, mm11.5
Beam Width @ Throat, mm12
Beam Width @ Mid, mm12
Beam Width @ Tip, mm12
Number of Main Strings16
Number of Cross Strings19
Ratio.639
Main String Grid Inch/mm7.42/188.5
Cross String Grid Inch/mm10.56/268.2
Density (% of head filled with string).804
Average Cross String Space.556
Average Main String Space.464
Dynamic
Dynamic Tension, Kp, ERT32
Dynamic Tension, Lbs/in178.9
First Moment, Nm.850
Polar Moment356
Torsional Stability17
Swing Weight, Kg/cm^2339
Swing Weight, Ounces11.96
Swing Weight Calculated350.0
Power, RDC55
Control, RDC41
Manueverability, RDC61
Power, Calculated 2151.9
Head Points11.34
Head Weight, %44.9
Center of Percussion21.5
Dwell Time, ms6.83
Efective Stiffness - lbs26.7
K, Lb/In150.6
Recoil Weight178.85
Twist Weight250.25
End Weight 153.9
Tip Weight 200.4
9 O'Clock95.7
3 O'Clock94.4
Butt End163.6
COF, Main.304
COF, Cross.386
PropertyOriginalExtendedChange %
Overall Weight31935510.1
Swing Weight3103398.5
Length27.027.552.0
Power Calculaton1892.82151.912.0
Recoil Weight149.4178.816.4
Twist Weight224.87250.210.1

 

 

 

Posted on December 7, 2025 Sun, in Custom Racquets, Customization!, Dwell Time, Extended, Weight, Wilson. Bookmark the permalink. Leave a comment.

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