Category Archives: Technology
Head Radical MP 2023
You have seen the pretty pictures; now see the specs of this new Radical series!
We are starting our property review with the Head Radical MP 2023. The MP version will probably be the most popular due to the very lovely weight and “player” style head size of 98 inches!

Head Radical MP 2023
As you look at the following specifications you may notice the addition of some “numbers”, specifically “beam width”.
We have been taking this number for many years but now believe it is time to expose it to you, the readers.
Briefly, the beam height-to-width ratio contributes to in-plane stiffness which is important for consistent string bed stiffness (SBS).
Manufacturer | Head |
---|---|
Racquet Model | Head Radical MP 2023 |
Reference Tension | 55 |
String | MonoGut ZX Pro |
Machine Used | True Tension Professional |
String Bed Stiffness - RDC | 53.0 Units |
String Bed Stiffness -FlexFour | 64.9 pounds |
String Bed Stiffness - SBS | 51.8 pounds |
String Bed Stiffness - ERT | 35 Kg/Cm |
Racquet Flex, RDC | 65 - After stringing |
Racquet Flex, FlexFour | 44.5 |
Racquet - In Plane Stiffness | 379.7 lbs/Inch |
Weight, Grams | 326 |
Weight, Ounces | 11.50 |
Balance, mm | 333 |
Balance, Inch | 13.11 |
Length, Cm | 68.57 |
Length, Inch | 27.00 |
Head Width | 9.63 |
Head Length | 12.79 |
Head Area, cm2 | 623.0 |
Head Area, Sq. Inch | 96.7 |
Beam Height @ Grip, mm | 21.0 |
Beam Height @ Mid, mm | 22.5 |
Beam Height @ Tip | 20.5 |
Beam Width @ Grip, mm | 12.5 |
Beam Width @ Throat, mm | 11.5 |
Beam Width @ Mid, mm | 12.8 |
Beam Width @ Tip, mm | 12.8 |
Number of Main Strings | 16 |
Number of Cross Strings | 19 |
Ratio Cross/Mains | .634 |
Main String Grid | 7.18 |
Cross String Grid | 9.44 |
Density (% of head filled with string) | 69.6% |
Average Cross String Space | .494 |
Average Main String Space | .449 |
Dynamic Tension, Kp, ERT | 35 |
Dynamic Tension, Lbs/in | 195.76 |
First Moment, Nm | .841 |
Polar Moment | 347 |
Torsional Stability | 16 |
Swing Weight, Kg/cm2 | 331 |
Swing Weight, Ounces | 11.68 |
Swing Weight Calculated | 361.5 |
Power, RDC | 52 |
Control, RDC | 49 |
Manueverability, RDC | 66 |
Power, Calculated | 2101.4 |
Head Points | 3.15 |
Head Weight, % | 48.5% |
Center of Percussion | 21.1 |
Dwell Time, ms | 8.74 |
Efective Stiffness - lbs | 29.2 |
K, Lb/In | 169.87 |
Recoil Weight | 156.44 |
Twist Weight | 226.48 |
End Weight | 126.0 |
Tip Weight | 197.7 |
9 O'Clock | 105.1 |
3 O'Clock | 104.7 |
Butt Cap | 115.6 |
COF, Main | .416 |
COF, Cross | .388 |
Head…just when you thought it couldn’t get any better
The Head Radical has always been one of the best performance racquets available and doesn’t require much in the way of annual changes!
We think this new group is right on target! Adding Auxetic in the throat brings this series into the overall success of the Auxetic component!
We will be doing full reviews very soon, but in the meantime, take a look at these new Radicals!
The Team is the new “S” in the Radical Series! Based on our initial testing, we think this model has a trick up its sleeve!
ZUS Tennis
Never heard of them? I hadn’t either until yesterday!
ZUS is a Chicago-based company that offers several racquets with various specifications available.
A ZUS Custom Sven Goth Design came in for work, so we had a great opportunity to get all of the specifications and include them in a “racquet review”!
First, the racquet seems to be a well-made version of the Wilson Pro Staff RF, with an ever so slightly thinner modified box section beam. the geometry is very much like the Wilson Pro Staff RF, as is the weight.
This racquet has a bunch of weight at the rear end, plus a shrink sleeve to increase the grip size, so it is loaded up with weight down there, which is OK!

Rear Weight
The racquet is foamed, probably the entire tube, which may contribute a more muted feel than a non-foamed racquet. The Pro Staff RF is also foam filled.
The small oval piece is a lead or steel, weight sandwiched between the two halves of the shaft. This construction makes it impossible to remove that weight if you want to, but it is good to have it there!
Manufacturer | ZUS |
---|---|
Racquet Model | ZUS Custom Sven Goth Design |
Reference Tension | 50 |
String | Prince Tour XR 16 |
Machine Used | True Tension Professional |
String Bed Stiffness - RDC | 53.0 Units |
String Bed Stiffness -FlexFour | 59.1 pounds |
String Bed Stiffness - SBS | 50.6 pounds |
String Bed Stiffness - ERT | 35 Kg/Cm |
Racquet Flex, RDC | 63 - After stringing |
Racquet Flex, FlexFour | 41.0 |
Racquet - In Plane Stiffness | 438.0 lbs/Inch |
Weight, Grams | 354 |
Weight, Ounces | 12.49 |
Balance, mm | 316 |
Balance, Inch | 12.44 |
Length, Cm | 68.57 |
Length, Inch | 27.00 |
Head Width | 9.41 |
Head Length | 12.80 |
Head Area, cm2 | 610.1 |
Head Area, Sq. Inch | 94.6 |
Beam Height @ Grip, mm | 20.5 |
Beam Height @ Mid, mm | 20.2 |
Beam Height @ Tip | 20.6 |
Beam Width @ Grip, mm | 10.8 |
Beam Width @ Throat, mm | 10.8 |
Beam Width @ Mid, mm | 11.6 |
Beam Width @ Tip, mm | 12.4 |
Number of Main Strings | 16 |
Number of Cross Strings | 19 |
Ratio Cross/Mains | .619 |
Main String Grid | 7.25 |
Cross String Grid | 9.68 |
Density (% of head filled with string) | .742 |
Average Cross String Space | .509 |
Average Main String Space | .453 |
Dynamic Tension, Kp, ERT | 35 |
Dynamic Tension, Lbs/in | 195.76 |
First Moment, Nm | .854 |
Polar Moment | 348 |
Torsional Stability | 18 |
Swing Weight, Kg/cm2 | 330 |
Swing Weight, Ounces | 11.64 |
Swing Weight Calculated | 353.5 |
Power, RDC | 51 |
Control, RDC | 49 |
Manueverability, RDC | 67 |
Power, Calculated | 1965.9 |
Head Points | 8.46 |
Head Weight, % | 46.1% |
Center of Percussion | 20.9 |
Dwell Time, ms | 8.74 |
Efective Stiffness - lbs | 28.8 |
K, Lb/In | 169.87 |
Recoil Weight | 167.26 |
Twist Weight | 235.57 |
End Weight | 151.7 |
Tip Weight | 197.9 |
9 O'Clock | 105.5 |
3 O'Clock | 108.1 |
Butt Cap | 137.1 |
COF, Main | .382 |
COF, Cross | .306 |
Let’s Compare
We publish many racquet reviews that include comprehensive data to be used to speed up the selection process for players looking to review racquets and possibly demo them.
We thought it might be fun to do a little comparison of racquets in a simple format and we are starting with this one!
When considering racquets there is one “weight” that outweighs them all and that is swing weight! Swing weight is also described as inertia which is, in our discussions, the term used to describe the momentum of a tennis racquet. Once it gets going it does not want to stop which equals power (sort of F=MA)
We will be adding groups of three (3) racquets whenever possible and when new racquets are introduced.
Our Questron in Action!
As you know, Racquet Quest is a data-driven business, and data requires numbers. To generate those numbers, we have designed and built several devices.
One device is the Questron!
The Questron is used to test every string we receive, and the data is compiled to understand where that particular string fits.
So, instead of talking about it we have included a short video!
Thank you for watching our Questron in Action! If you have a question, or a particular string of interest, please let us know. We may have already taken the data! On GASP.network there are many graphs of previous tests. GASP.network is a membership ($40.00 one time) site.