Category Archives: Technology
Head Graphene 360 + Gravity S
Here is where it gets interesting! This racquet, the Gravity S, is a realtivley thin beam 104 square inch racquet!
It has been a while since Head has presented this head size in a player oriented racquet! This 296 gram (10.44 ounce) racquet fills a serious need, in my opinion, for a “players” 104! The 24mm beam allows the stiffness to reflect the new “Spiral Tech” fiber placement.
I believe this racquet will appeal to serious adults seeking a comfortable racquet (RDC 56 strung) that can elevate their game.
This racquet has plenty of “cutomization” potential which makes it great choice for quickly advancing players.
Stop by and feel this combination for yourself, and take the demo for a real test on the court!
| Manufacturer | Head |
|---|---|
| Racquet Model | Head Graphene 360 + Gravity S |
| Reference Tension | 55 lbs - 24.9 kg |
| String | Head Velocity MLT Black |
| Machine Used | True Tension Professional |
| ASPS, RDC | 56 |
| ASPS, FlexFour | 64.0 |
| Racquet Flex, RDC | 55 - After stringing |
| Racquet Flex, FlexFour | 45 |
| Racquet - In Plane Stiffness | 304.6 lbs/Inch |
| Weight, Grams | 296.0 |
| Weight, Ounces | 10.44 |
| Balance, mm | 329 |
| Balance, Inch | 12.95 |
| Length, Cm | 68.6 |
| Length, Inch | 27.008 |
| Head Width | 10.15 |
| Head Length | 13.19 |
| Head Area, cm2 | 678.4 |
| Head Area, Sq. Inch | 105.2 |
| Number of Main Strings | 16 |
| Number of Cross Strings | 20 |
| Ratio Cross/Mains | .616 |
| Main String Grid | 7.25 |
| Cross String Grid | 9.87 |
| Density (% of head filled with string) | .680 |
| Average Cross String Space | .495 |
| Average Main String Space | .453 |
| Dynamic Tension, Kp, ERT | 37 |
| Dynamic Tension, Lbs/in | 206.9 |
| First Moment, Nm | .752 |
| Polar Moment | 306 |
| Torsional Stability | 14 |
| Swing Weight, Kg/cm2 | 292 |
| Swing Weight, Ounces | 10.30 |
| Swing Weight Calculated | 320.4 |
| Power, RDC | 35 |
| Control, RDC | 68 |
| Manueverability, RDC | 92 |
| Power, Calculated | 1705.7 |
| Head Points | 4.41 |
| Head Weight, % | 48.0% |
| Center of Percussion | 20.9 |
| Dwell Time, ms | 8.50 |
| Efective Stiffness - lbs | 27.7 |
| K, Lb/In | 179.4 |
| Recoil Weight | 138.9 |
| Twist Weight | 227.0 |
| End Weight | 117.8 |
| Tip Weight | 180.8 |
| 9 O'Clock | 91.3 |
| 3 O'Clock | 91.2 |
| Butt Cap | 114.8 |
Head Graphene 360 + Gravity MP Lite
The Gravity MP Lite as you would expect is lighter than the MP by about a ½ ounce with a corresponding reduction in swing weight. This can be easily remedied by increasing the swing weight while not effecting the ovefrall weight very much.
The MP LIte is a great example of a “customizable” racquet and deserves great consideration by any player seeking a performance racquet that will stay with them for a long time.
The head size of 100 square inches is consistent with the Pro and MP models.
Head Graphene 360 + Gravity MP Lite
These are not the same racquet but the entire series uses the two color graphics package with Lava on one side and Miami Green (my words) on the other. Sort of a fun point!
Take a look at the specifications that follow.
| Manufacturer | Head |
|---|---|
| Racquet Model | Head Graphene 360 + Gravity MP Lite |
| Reference Tension | 55 lbs - 24.9 kg |
| String | Head Velocity MLT Black |
| Machine Used | True Tension Professional |
| ASPS, RDC | 53 |
| ASPS, FlexFour | 60.0 |
| Racquet Flex, RDC | 59 - After stringing |
| Racquet Flex, FlexFour | 45 |
| Racquet - In Plane Stiffness | 331.5 lbs/Inch |
| Weight, Grams | 292.0 |
| Weight, Ounces | 10.3 |
| Balance, mm | 333 |
| Balance, Inch | 13.11 |
| Length, Cm | 68.6 |
| Length, Inch | 27.008 |
| Head Width | 9.94 |
| Head Length | 12.85 |
| Head Area, cm2 | 647.1 |
| Head Area, Sq. Inch | 100.3 |
| Number of Main Strings | 16 |
| Number of Cross Strings | 20 |
| Ratio Cross/Mains | .619 |
| Main String Grid | 7.70 |
| Cross String Grid | 10.30 |
| Density (% of head filled with string) | .791 |
| Average Cross String Space | .515 |
| Average Main String Space | .481 |
| Dynamic Tension, Kp, ERT | 35 |
| Dynamic Tension, Lbs/in | 195.7 |
| First Moment, Nm | .753 |
| Polar Moment | 308 |
| Torsional Stability | 14 |
| Swing Weight, Kg/cm2 | 294 |
| Swing Weight, Ounces | 10.37 |
| Swing Weight Calculated | 323.8 |
| Power, RDC | 41 |
| Control, RDC | 62 |
| Manueverability, RDC | 91 |
| Power, Calculated | 1757.3 |
| Head Points | 3.15 |
| Head Weight, % | 48.5% |
| Center of Percussion | 20.9 |
| Dwell Time, ms | 8.74 |
| Efective Stiffness - lbs | 27.9 |
| K, Lb/In | 169.8 |
| Recoil Weight | 137.6 |
| Twist Weight | 215.2 |
| End Weight | 114.4 |
| Tip Weight | 181.1 |
| 9 O'Clock | 88.8 |
| 3 O'Clock | 90.9 |
| Butt Cap | 113.8 |
Head Graphene 360 + Gravity Pro
The Gravity Pro is the racquet all 18×20 players have been waiting for!
Why? Great weight, and excellent swing weight right out of the box! For players that think the Prestige models are too stiff, (they are not), this model will provide feed-back that the Prestige damps out through the cap system.
Big hitters will benefit from the 18 x 20 string pattern when going for the “flat, down the line” shot.
You will see all the specifications later on but now let’s talk about the reaction to the binary graphics package that is used on all the Gravity models. One side is Lava, and the other side is Miami Green ( my description) which makes for an exciting pickup reaction!
Head Graphene 360 + Gravity Pro
The excellent stiffness of RDC 60 combines with the dense string pattern to yield an effective stiffness of 30.7.
Now for some fun!
| Manufacturer | Head |
|---|---|
| Racquet Model | Head Graphene 360 + Gravity Pro |
| Reference Tension | 57 lbs - 25.9 kg |
| String | Head Velocity MLT 17 Black |
| Machine Used | True Tension Professional |
| ASPS, RDC | 63 |
| ASPS, FlexFour | 68.5 |
| Racquet Flex, RDC | 60 - After stringing |
| Racquet Flex, FlexFour | 46 |
| Racquet - In Plane Stiffness | 428.6 lbs/Inch |
| Weight, Grams | 328 |
| Weight, Ounces | 11.57 |
| Balance, mm | 326 |
| Balance, Inch | 12.83 |
| Length, Cm | 68.6 |
| Length, Inch | 27.008 |
| Head Width | 9.91 |
| Head Length | 12.85 |
| Head Area, cm2 | 645.2 |
| Head Area, Sq. Inch | 100.0 |
| Number of Main Strings | 18 |
| Number of Cross Strings | 20 |
| Ratio Cross/Mains | .694 |
| Main String Grid | 7.75 |
| Cross String Grid | 10.25 |
| Density (% of head filled with string) | .794 |
| Average Cross String Space | .513 |
| Average Main String Space | .431 |
| Dynamic Tension, Kp, ERT | 40 |
| Dynamic Tension, Lbs/in | 233.7 |
| First Moment, Nm | .824 |
| Polar Moment | 348 |
| Torsional Stability | 17 |
| Swing Weight, Kg/cm2 | 331 |
| Swing Weight, Ounces | 11.68 |
| Swing Weight Calculated | 348.6 |
| Power, RDC | 39 |
| Control, RDC | 62 |
| Manueverability, RDC | 66 |
| Power, Calculated | 2006.0 |
| Head Points | 5.35 |
| Head Weight, % | 47.5 |
| Center of Percussion | 21.5 |
| Dwell Time, ms | 8.02 |
| Efective Stiffness - lbs | 30.7 |
| K, Lb/In | 201.9 |
| Recoil Weight | 165.8 |
| Twist Weight | 240.4 |
| End Weight | 132.7 |
| Tip Weight | 197.4 |
| 9 O'Clock | 98.6 |
| 3 O'Clock | 99.5 |
| Butt Cap | 131.1 |
Head Graphene 360 + Gravity MP
The new Head Gravity MP seemed like the perfect place to start with this new series of racquets so that is what we did!
We believe this racquet falls between the Prestige and Radical series and will appeal to more players than either of those. Plus, there are two (2) 104 square inch models, the Lite, and S. These are relativley “thin” beam, (Lite and S = 24.4mm) racquets that Head has been missing, in my opinion, for a while.
It has a “flip” color scheme…one side is lava and the other is Miami Green (my word).
Head Graphene 360 + Gravity MP Lava Side
The head shape is a little more round. The weight is 312 grams (11.01 oz) which I think is a little light. The swing weight is 324 kg/cm² ( a good starting point).
The unique fiber layup is designed to “uncoil” at impact contributing to a new kind of power, and hopefully comfort.
The unique fiber layup is designed to “uncoil” at impact contributing to a new kind of power, and hopefully comfort.
The Series consists of a “Pro”, “MP”. “MP Lite”, “S”, and”Lite”. There is a Model Comparison post where you can see all of the racquets in one place.
| Manufacturer | Head |
|---|---|
| Racquet Model | Head Graphene 360 + Gravity MP |
| Reference Tension | 55 lbs - 24.9 kg |
| String | MonoGut ZX Pro |
| Machine Used | True Tension Professional |
| ASPS, RDC | 52 |
| ASPS, FlexFour | 60.5 |
| Racquet Flex, RDC | 59 - After stringing |
| Racquet Flex, FlexFour | 43 |
| Racquet - In Plane Stiffness | 380.1 lbs/Inch |
| Weight, Grams | 312 |
| Weight, Ounces | 11.01 |
| Balance, mm | 342 |
| Balance, Inch | 13.46 |
| Length, Cm | 68.6 |
| Length, Inch | 27.008 |
| Head Width | 9.92 |
| Head Length | 12.85 |
| Head Area, cm2 | 645.9 |
| Head Area, Sq. Inch | 100.1 |
| Number of Main Strings | 16 |
| Number of Cross Strings | 20 |
| Ratio Cross/Mains | .617 |
| Main String Grid | 7.62 |
| Cross String Grid | 10.30 |
| Density (% of head filled with string) | .798 |
| Average Cross String Space | .515 |
| Average Main String Space | .476 |
| Dynamic Tension, Kp, ERT | 35 |
| Dynamic Tension, Lbs/in | 195.7 |
| First Moment, Nm | .833 |
| Polar Moment | 340 |
| Torsional Stability | 16 |
| Swing Weight, Kg/cm2 | 324 |
| Swing Weight, Ounces | 11.43 |
| Swing Weight Calculated | 364.9 |
| Power, RDC | 46 |
| Control, RDC | 56 |
| Manueverability, RDC | 71 |
| Power, Calculated | 1932.8 |
| Head Points | .31 |
| Head Weight, % | 49.9% |
| Center of Percussion | 20.8 |
| Dwell Time, ms | 8.82 |
| Efective Stiffness - lbs | 27.6 |
| K, Lb/In | 166,7 |
| Recoil Weight | 143.69 |
| Twist Weight | 229.04 |
| End Weight | 114.6 |
| Tip Weight | 200.3 |
| 9 O'Clock | 99.2 |
| 3 O'Clock | 99.4 |
| Butt Cap | 114.9 |
Head Graphene 360 + Gravity Series Lineup
In addition to individual model specifications we like to do a consolidated series comparison so we can glance at the differences between racquets. Following is that comparison. All the data is taken with strung racquets with a vibration damper but no overgrip.
See the Five Models Compared Here
See Larger Images of Each Model Here
So, what is important in this data? Well, to us, everything or we wouldn’t include it but we like to explain some of the not so obvious numbers.
End Weight: the weight of the butt end of the racquet when using two (2) electronic scales
Tip Weight: the weight of the top end of the racquet when usisng two (2) electronic scales
Why important: this accurately calculates static balance and allows easy maching of multiple racquets
Swing Weight: the higher the swing weight the higher the energy colliding with the ball.
Why important: this is the most meaningful number in terms of momentum into the ball.
InPlane Stiffness: this tell us how stiff the racquet is when a load is apllied to the 3 and 9 o’clock positions.
Why important: a higher number means the racquet is stiff in that direction affecting string bed stiffness.
Stability: this tell us how the racquet reacts to ball impact.
Why important: the higher the number the more power and control that can be contributed to the racquet.
Position 1, 2, and 3: three (3) electronic scales are used to weigh the racquet.
Why important: we can match the rotational inertia of each racquet.
Peak Load: this tells us the peak force of the ball impact on your body. Higher loads contribute to injury.
Why important: we can make adjustments to the string bed stiffness to keep the peak loads safe.
Everything else should be clear but if you have questions please “Ask John”
Racquet Quest, LLC
