Category Archives: PEEK
Why String Bed Stiffness (SBS) matters.
String bed stiffness is a critical performance metric and therefore deserves more attention than it gets in the discussion(s) of string characteristics.
In this video, which is a little “jumpy” at first, you will see the data we collect for every racquet we do. For this discussion, we concentrate on these data:
- Reference Tension
- RDC string bed stiffness
- Flex Four-string bed stiffness
- Racquet Quest SBS (String Sense) stiffness
- Effective stiffness
- Master Tensometer string bed stiffness (kg/cm^)
Head Squared
We have demo racquets of the new Head Squared racquet. The racquets will arrive soon, and those who have tried it agree it is quite a different racquet!
The racquet specifications make this a model that will suit players of many abilities, and is a stable and easy racquet to play with!
You can demo your Head Squared now at Racquet Quest for delivery about mid-April!
Head Squared
Because this racquet is so different, we have done a few “customizations”. This post will include two (2) of those customizations. After you take a look at this data, we can discuss what players thought of each.
| Manufacturer | Head |
|---|---|
| Racquet Model | Head Squared |
| Reference Tension | 54 |
| String | MonoGut ZX Pro PEEK |
| Machine Used | True Tension Pro |
| String Bed Stiffness - RDC | 47 |
| String Bed Stiffness -FlexFour | 55 |
| Strig Bed Stiffness - SBS | 46 |
| String Bed Stiffness - ERT | 32 |
| Racquet Flex, RDC | 59 |
| Racquet Flex, FlexFour | 46 |
| Racquet - In Plane Stiffness | 391.1 |
| Weight, Grams | 318 |
| Weight, Ounces | 11.22 |
| Balance, mm | 306 |
| Balance, Inch | 12.05 |
| Length, Cm | 68.7 |
| Length, Inch | 27.047 |
| Head Width | 9.94 |
| Head Length | 12.85 |
| Head Area, cm2 | 647.1 |
| Head Area, Sq. Inch | 100.3 |
| Beam Height @ Grip, mm | 22.5 |
| Beam Height @ Mid, mm | 25 |
| Beam Height @ Tip | 23 |
| Beam Width @ Grip, mm | 10.5 |
| Beam Width @ Throat, mm | 12.4 |
| Beam Width @ Mid, mm | 10.1 |
| Beam Width @ Tip, mm | 12 |
| Number of Main Strings | 16 |
| Number of Cross Strings | 18 |
| Ratio | .687 |
| Main String Grid Inch/mm | 7.63/193.8 |
| Cross String Grid Inch/mm | 10.40/264.2 |
| Density (% of head filled with string) | .791 |
| Average Cross String Space | .578 |
| Average Main String Space | .477 |
| Dynamic Tension, Kp, ERT | 32 |
| Dynamic Tension, Lbs/in | 178.9 |
| First Moment, Nm | .736 |
| Polar Moment | 303.0 |
| Torsional Stability | 13 |
| Swing Weight, Kg/cm2 | 290 |
| Swing Weight, Ounces | 10.23 |
| Swing Weight Calculated | 297.8 |
| Power, RDC | 41 |
| Control, RDC | 58 |
| Manueverability, RDC | 93 |
| Power, Calculated | 1733.3 |
| Head Points | 11.81 |
| Head Weight, % | 44.5% |
| Center of Percussion | 21.4 |
| Dwell Time, ms | 6.83 |
| Efective Stiffness - lbs | 26.2 |
| K, Lb/In | 150.6 |
| Recoil Weight | 157.1 |
| Twist Weight | 234.4 |
| End Weight | 142.2 |
| Tip Weight | 175.6 |
| 9 O'Clock | 85.4 |
| 3 O'Clock | 85.2 |
| Butt End | 148.1 |
| COF, Main | .323 |
| COF, Cross | .346 |
See what a subtle change in swing weight makes to the racquet.
| Manufacturer | Head |
|---|---|
| Racquet Model | Head Squared |
| Reference Tension | 54 |
| String | Victrex 7718 PEEK |
| Machine Used | True Tension Pro |
| String Bed Stiffness - RDC | 47 |
| String Bed Stiffness -FlexFour | 55 |
| Strig Bed Stiffness - SBS | 46 |
| String Bed Stiffness - ERT | 32 |
| Racquet Flex, RDC | 59 |
| Racquet Flex, FlexFour | 46 |
| Racquet - In Plane Stiffness | 391.1 |
| Weight, Grams | 318 |
| Weight, Ounces | 11.22 |
| Balance, mm | 306 |
| Balance, Inch | 12.05 |
| Length, Cm | 68.7 |
| Length, Inch | 27.047 |
| Head Width | 9.94 |
| Head Length | 12.85 |
| Head Area, cm2 | 647.1 |
| Head Area, Sq. Inch | 100.3 |
| Beam Height @ Grip, mm | 22.5 |
| Beam Height @ Mid, mm | 25 |
| Beam Height @ Tip | 23 |
| Beam Width @ Grip, mm | 10.5 |
| Beam Width @ Throat, mm | 12.5 |
| Beam Width @ Mid, mm | 10.2 |
| Beam Width @ Tip, mm | 12.1 |
| Number of Main Strings | 16 |
| Number of Cross Strings | 18 |
| Ratio | .687 |
| Main String Grid Inch/mm | 7.63/193.8 |
| Cross String Grid Inch/mm | 10.40/264.2 |
| Density (% of head filled with string) | .791 |
| Average Cross String Space | .578 |
| Average Main String Space | .477 |
| Dynamic Tension, Kp, ERT | 32 |
| Dynamic Tension, Lbs/in | 178.9 |
| First Moment, Nm | .736 |
| Polar Moment | 303.0 |
| Torsional Stability | 13 |
| Swing Weight, Kg/cm2 | 290 |
| Swing Weight, Ounces | 10.23 |
| Swing Weight Calculated | 345,6 |
| Power, RDC | 41 |
| Control, RDC | 58 |
| Manueverability, RDC | 93 |
| Power, Calculated | 1733.3 |
| Head Points | 11.81 |
| Head Weight, % | 44.5% |
| Center of Percussion | 21.4 |
| Dwell Time, ms | 6.83 |
| Efective Stiffness - lbs | 26.2 |
| K, Lb/In | 150.6 |
| Recoil Weight | 157.1 |
| Twist Weight | 234.4 |
| End Weight | 142.2 |
| Tip Weight | 175.6 |
| 9 O'Clock | 85.4 |
| 3 O'Clock | 85.2 |
| Butt End | 148.1 |
| COF, Main | .323 |
| COF, Cross | .346 |
Big 10 Tennis Player of the Week.
Jack Anthrop has been playing extraordinary tennis for a long time and was recently named Big 10 Tennis Player of the Week after an impressive outing in Dallas!
The link below will take you to the Ohio State post; however, I want to share some of the things Jack has done to secure the game he has.
Jack uses a Head Speed SMU racquet. The head size is 96 square inches and has a swing weight of 333 kg/cm^. This inertia couples with the overall weight of 352 grams (12.4 oz) to create stability and power.
Jack uses MonoGut ZX Pro natural at a reference tension of 56 pounds and string bed stiffness of 60 pounds. This creates a dynamic stiffness of 393.6 PPI.
Jack has been using Ashaway MonoGut ZX Pro since the age of 9! Yep, that’s right, age 9! MonoGut ZX and ZX Pro material is PEEK, a unique string that offers outstanding comfort, feel, and power with better durability than some other materials.
It is our position that more players of any level should consider MonoGut ZX or ZX Pro (thinner). It really just makes sense…just ask Jack, Big 10 Men’s Tennis Player of the Week!
Let us know if you have questions about Jack’s racquet or string. We have been working with Jack since age 9, and we would like to share what we can to help achieve your tennis goal(s).
Thank you, Head and Ashaway, for your continued support!
mens-tennis-anthrop-earns-big-ten-player-of-the-week
Congratulations, Jack, your new Head Speed SMU’s are on the way.
Head Speed SMU
Head Speed SMU
More Face Time?
We have found a good format for our video content creation and presentation.
After trying several highly rated and pricey options, we have settled on QuickTime, iMovie, and YouTube.
- Quick Time for recording the video
- iMovie for editing (which we want to keep to a minimum)
- YouTube for presentation
Now there is an “RQ on YouTube” button on the home page menubar! Right now, this is at the very right side of the menu, so please use it to get to our YouTube channel easily.
Thank yo for joining us for “more face time”!
Racquet Quest, LLC
