Category Archives: String Patterns

Prince Vortex 300

The new Prince Vortex design is a new offering of an older string pattern with 14 main strings and 21 cross strings in a variable taper beam…whew!  You can see by the throat design that the main strings are longer that a conventional throat design.  The longer the main strings the more energy they can return…sort of, and in some cases!

Vortex 300

The beam starts at the grip with a strong 25mm then tapers into a 23mm at the throat and then back to 25mm at the tip.  Do not let the beam dimensions fool you!  The RDC flex of 59 after stringing is quite acceptable for most every player style.

We have been taking coefficient of friction (COF) data for years  but have not included it this review format, until now.  The 14×21 string pattern is unique enough that it is worth including.  You will see the numbers on the review specs so we won’t go into them now, however the numbers are interesting.

The 14 main strings contribute to a very “open” area right about where most extreme “spin” shots are hit according to our data of string failure positions.

The frame geometry is sort of “Aero” like.  The shaft is trapezoidal that transitions into a “reverse” trapezoid around the head.  It makes the racquet look stiffer than it is!

Take a look at the specs then pick up a demo to see what the numbers mean to you!

ManufacturerPrince
Racquet ModelPrince Vortex 300
Reference Tension56 lbs - 25.4kg
String
Victrex 7718
Machine UsedTrue Tension Professional
Static
ASPS, RDC45
ASPS, FlexFour58.5
Racquet Flex, RDC59 - After stringing
Racquet Flex, FlexFour40.0
Racquet - In Plane Stiffness526.3 lbs/Inch
Weight, Grams322
Weight, Ounces11.36
Balance, mm320
Balance, Inch12.60
Length, Cm68.6
Length, Inch27.008
Head Width9.94
Head Length12.94
Head Area, cm2652
Head Area, Sq. Inch101.1
Number of Main Strings14
Number of Cross Strings21
Ratio Cross/Mains.512
Main String Grid7.30
Cross String Grid9.50
Density (% of head filled with string).686
Average Cross String Space.452
Average Main String Space.521
Dynamic
Dynamic Tension, Kp, ERT32
Dynamic Tension, Lbs/in176.98
First Moment, Nm.790
Polar Moment336
Torsional Stability17
Swing Weight, Kg/cm2319
Swing Weight, Ounces11.25
Swing Weight Calculated329.7
Power, RDC47
Control, RDC52
Manueverability, RDC74
Power, Calculated 1921.1
Head Points7.24
Head Weight, %46.6
Center of Percussion21.7
Dwell Time, ms9.48
Efective Stiffness - lbs30.2
K, Lb/In144.23
Recoil Weight165.41
Twist Weight237.56
End Weight 134.5
Tip Weight 189.0
9 O'Clock96.2
3 O'Clock96.1
Butt Cap131.4
Coefficient of Friction: M.400
Coefficient of Friction: X.262

 

 

Prince RipStick 300

I am not saying the is not a serious tennis racquet but the first descriptor that come to mind is “fun”! And who does not want to have a little fun while playing tennis, huh?

RipStick 300


This is one of the remaining racquets with the “O” Port technology which is very large string openings instead of small grommet holes. The design allows for much more string movement and the 16×18 string bed helps!  The “O” Ports create an effective head size of 105 in a racquet that measures 100 square inches.

But, just look at those colors!  I think they are awesome!

This is a constant taper beam starting at 22.5mm going up to 27mm so if you are “thin beam” person you may hesitate to hit with this racquet, but we think you may be missing out!

If you just look at the racquet you may think it to be quite stiff.  That is not the case!  With an RDC stiffness of 62 after stringing we arrive at an effective stiffness of 30.2 with this string setup.  Not bad!

Take a look at the specs then come get the demo and see what all these numbers mean to you!

ManufacturerPrince
Racquet ModelPrince RipStick 300
Reference Tension60 lbs - 27.2kg
String
Prince Premier 16
Machine UsedTrue Tension Professional
Static
ASPS, RDC59
ASPS, FlexFour64.5
Racquet Flex, RDC62 - After stringing
Racquet Flex, FlexFour46.6
Racquet - In Plane Stiffness504.2 lbs/Inch
Weight, Grams328
Weight, Ounces11.57
Balance, mm323
Balance, Inch12.72
Length, Cm68.6
Length, Inch27.008
Head Width10.00
Head Length12.87
Head Area, cm2645
Head Area, Sq. Inch100.1
Number of Main Strings16
Number of Cross Strings18
Ratio Cross/Mains.694
Main String Grid7.56
Cross String Grid9.12
Density (% of head filled with string).679
Average Cross String Space.531
Average Main String Space.469
Dynamic
Dynamic Tension, Kp, ERT36
Dynamic Tension, Lbs/in201.35
First Moment, Nm.814
Polar Moment337
Torsional Stability17
Swing Weight, Kg/cm2320
Swing Weight, Ounces11.29
Swing Weight Calculated342.2
Power, RDC43
Control, RDC58
Manueverability, RDC73
Power, Calculated 2095.5
Head Points6.14
Head Weight, %47.2
Center of Percussion21.2
Dwell Time, ms8.28
Efective Stiffness - lbs30.2
K, Lb/In189.10
Recoil Weight159.2
Twist Weight256.05
End Weight 134.9
Tip Weight 194.5
9 O'Clock100.8
3 O'Clock97.3
Butt Cap130.2

 

 

 

Head Speed Pro Black

As you probably know by now Novak Djokovic plays with a version of the Head Speed but in black, not black and white! So it was only a matter of time until the all-black Speed Pro became available.

Until now we only had the black and white Speed Pro demo but now we have the black one!

This review will include the white and black version of the Speed and we will include a comparison to the Wilson Blade Pro!

These are each extraordinary racquets!  You will discover subtle differences in the specifications, especially the Wilson Blade Pro being a 16×19 pattern and the Head Speed Pro, in this case, is 18×20.  The geometry and frame of the 16×19 and 18×20 are the same so the numbers are meaningful!

 

ManufacturerHead
Racquet ModelHead Graphene 360 + Speed Pro Black
Reference Tension54 lbs - 24.5 kg
String
Head Reflex MLT
Machine UsedTrue Tension Professional
Static
ASPS, RDC56
ASPS, FlexFour66.5
Racquet Flex, RDC57 - After stringing
Racquet Flex, FlexFour50.5
Racquet - In Plane Stiffness325.2 lbs/Inch
Weight, Grams334
Weight, Ounces11.78

Balance, mm325
Balance, Inch12.80
Length, Cm68.6
Length, Inch27.008
Head Width9.618
Head Length13.10
Head Area, cm2636.1
Head Area, Sq. Inch98.6
Number of Main Strings18
Number of Cross Strings20
Ratio Cross/Mains.662
Main String Grid7.565
Cross String Grid10.30
Density (% of head filled with string).7735
Average Cross String Space.513
Average Main String Space.413
Dynamic
Dynamic Tension, Kp, ERT35
Dynamic Tension, Lbs/in195.7
First Moment, Nm.836
Polar Moment341
Torsional Stability15
Swing Weight, Kg/cm2326
Swing Weight, Ounces11.50
Swing Weight Calculated352.8
Power, RDC42
Control, RDC59
Manueverability, RDC69
Power, Calculated 1832.1
Head Points5.51
Head Weight, %47.0%
Center of Percussion21.016
Dwell Time, ms8.502
Efective Stiffness - lbs28.25
K, Lb/In179.49
Recoil Weight159.3
Twist Weight231.4
End Weight 134.5
Tip Weight 198.0
9 O'Clock99.0
3 O'Clock99.6
Butt Cap134.0

 

And now for the white and black version:

ManufacturerHead
Racquet ModelHead Graphene 360+ Speed Pro
Reference Tension56 lbs - 25.4 kg
String
Victrex PEEK fiber Experimental 7718
Machine UsedTrue Tension Professional
Static
ASPS, RDC55
ASPS, FlexFour66.5
Racquet Flex, RDC60 - After stringing
Racquet Flex, FlexFour43
Weight, Grams327
Weight, Ounces11.53
Balance, mm323
Balance, Inch12.72
Length, Cm68.5
Length, Inch26.97
Head Width9.69
Head Length13.06
Head Area, cm2641.2
Head Area, Sq. Inch99.4
Beam Width, mm, Shaft, Center, Tip23, 23, 23
In Plane Stiffness, Pounds/In335.2 Lbs/In.
In Plane Stiffness, Kg/cm 152.0 Kg/cm
Number of Main Strings18
Number of Cross Strings20
Ratio Cross/Mains.668
Main String Grid7.62
Cross String Grid10.37
Density (% of head filled with string).768
Average Cross String Space.513
Average Main String Space.414
Dynamic
Dynamic Tension, Kp, ERT37
Dynamic Tension, Lbs/in206.94
First Moment, Nm.812
Polar Moment336
Torsional Stability16
Swing Weight, Kg/cm2320
Swing Weight, Ounces11.29
Swing Weight Calculated341.2
Power, RDC45
Control, RDC57
Manueverability, RDC73
Power, Calculated 1908.2
Head Points6.14 (negative = head heavy
Head Weight, %47.2%
Center of Percussion21.2
Dwell Time, ms, No Swing8.58
Efective Stiffness - lbs28.7
K, Lb/In (SBS) RDC176.28
Recoil Weight159.71
Twist Weight229.85
End Weight 133.4
Tip Weight 192.8
9 O'Clock97.1
3 O'Clock97.5
Butt Cap131.0
This Wilson Blade Pro was not strung by Racquet Quest. The specifications are included as a comparison only…not a string recommendation.

And now for the Wilson Blade Pro:

ManufacturerWilson
Racquet ModelWilson Blade Pro
Reference Tension54 lbs - 23.6 k2
String
ALU Power Rough
Machine UsedUnknown
Static
ASPS, RDC35
ASPS, FlexFour53
Racquet Flex, RDC62 - After stringing
Racquet Flex, FlexFour48
Racquet - In Plane Stiffness387.1 lbs/Inch
Weight, Grams337
Weight, Ounces11.89
Balance, mm327
Balance, Inch12.87
Length, Cm68.6
Length, Inch27.008
Head Width9.6
Head Length12.80
Head Area, cm2623.3
Head Area, Sq. Inch96.6
Number of Main Strings16
Number of Cross Strings19
Ratio Cross/Mains.634
Main String Grid7.37
Cross String Grid10.40
Density (% of head filled with string).7934
Average Cross String Space.547
Average Main String Space.461
Dynamic
Dynamic Tension, Kp, ERT27
Dynamic Tension, Lbs/in151.0
First Moment, Nm.850
Polar Moment358
Torsional Stability16
Swing Weight, Kg/cm2342
Swing Weight, Ounces12.06
Swing Weight Calculated360.35
Power, RDC55
Control, RDC42
Manueverability, RDC59
Power, Calculated 2069.0
Head Points5.04
Head Weight, %47.07
Center of Percussion21.535
Dwell Time, ms10.755
Efective Stiffness - lbs22.37
K, Lb/In112.18
Recoil Weight170.8
Twist Weight234.0
End Weight 135.0
Tip Weight 202.9
9 O'Clock100.8
3 O'Clock103.7
Butt Cap132.2

Friction v Tension…what wins?

We all know what friction is.  It keeps our cars from sliding around, it keeps us from slipping and in general makes movement possible!

Friction also plays an important part in the string bed of your tennis racquet.  Friction between the strings and the ball create friction which in turn creates rotation.

What are, however, some of the downsides of friction in the string bed during, and after, the stringing process?

Friction v Tension

For more detailed information and a graph showing the forces involved go to our membership site, GASP.network, but in the meantime this image will show the frictional forces at work!

This machine tension head will pull the string (blue) in the direction of the center of the racquet support structure instead of directly out the middle of the grommet.

It is obvious that this will create considerable friction and result in lower tension inside the grommet than outside the grommet.

Our equipment and technique eliminates this friction resulting in a uniform string bed.

Head Graphene 360+ Radical S v21

From our perspective the Radical S should be one of the most used of the Radical Series!

Head Graphene 360+ Radical S

Why?  The 102 square inch head size is optimum for players looking for additional power,( and who isn’t) in a legitimate players racquet.  We say “legitimate” because this racquet can be turned into any thing you want, now or in the future!

As you will see in the specifications this is not a really stiff racquet so it will be easy for many players to customize the string bed to suit current playing style with an eye toward becoming a more aggressive player, or not!

The Radical S continues with the “control pattern” and “sound grommets”.  We are not totally certain what the “sound grommets” do but sound is frequency and frequency can be felt so maybe the grommets are damping out some of the higher frequencies?

Anyway, this Radical S model is a great step into the “performance” racquet arena with plenty of room to grow!

 

Head Graphene 360+ Radical S v21
ManufacturerHead
Racquet ModelHead Graphene 360+ Radical S v21
Reference Tension55 lbs - 24.9 k
String: Main/Cross
Victrex 7718
Machine UsedTT Professional
Static
ASPS, RDC55
ASPS, FlexFour61.5
Racquet Flex, RDC61 - After stringing
Racquet Flex, FlexFour50
Weight, Grams296
Weight, Ounces10.44
Balance, mm333
Balance, Inch13.11
Length, Cm68.5
Length, Inch26.968
Head Width9.860
Head Length13.09
Head Area, cm2653.9
Head Area, Sq. Inch101.3
Beam Width, mm, Shaft, Center, Tip22, 25, 23
In Plane Stiffness, Pounds/In370.4 Lbs/In
In Plane Stiffness, Kg/cm66.2 Kg/cm





Number of Main Strings16
Number of Cross Strings19
Ratio Cross/Mains.634
Main String Grid7.30
Cross String Grid9.75
Density (% of head filled with string).703
Average Cross String Space.513
Average Main String Space.449
Dynamic
Dynamic Tension, Kp, ERT35
Dynamic Tension, Lbs/in195.8
First Moment, Nm.764
Polar Moment320
Torsional Stability17
Swing Weight, Kg/cm2303
Swing Weight, Ounces10.69
Swing Weight Calculated328
Power, RDC42
Control, RDC60
Manueverability, RDC85
Power, Calculated 1873.1
Head Points2.99 (negative = head heavy)
Head Weight, %48.6%
Center of Percussion21.2
Dwell Time, ms, No Swing8.58
Effective Stiffness - lbs28.9
K, Lb/In (SBS) RDC176.28
Recoil Weight144.50
Twist Weight214.65
End Weight113.1
Tip Weight183.4
Total Weight296.5
9 O'Clock92.1
3 O'Clock91.8
Butt Cap112.2
Total Weight296.1