Category Archives: String

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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).

IMG_0396

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.

ManufacturerHead
Racquet ModelHead Graphene 360 + Gravity MP
Reference Tension55 lbs - 24.9 kg
String
MonoGut ZX Pro
Machine UsedTrue Tension Professional
Static
ASPS, RDC52
ASPS, FlexFour60.5
Racquet Flex, RDC59 - After stringing
Racquet Flex, FlexFour43
Racquet - In Plane Stiffness380.1 lbs/Inch
Weight, Grams312
Weight, Ounces11.01


Balance, mm342
Balance, Inch13.46
Length, Cm68.6
Length, Inch27.008
Head Width9.92
Head Length12.85
Head Area, cm2645.9
Head Area, Sq. Inch100.1
Number of Main Strings16
Number of Cross Strings20
Ratio Cross/Mains.617
Main String Grid7.62
Cross String Grid10.30
Density (% of head filled with string).798
Average Cross String Space.515
Average Main String Space.476
Dynamic
Dynamic Tension, Kp, ERT35
Dynamic Tension, Lbs/in195.7
First Moment, Nm.833
Polar Moment340
Torsional Stability16
Swing Weight, Kg/cm2324
Swing Weight, Ounces11.43
Swing Weight Calculated364.9
Power, RDC46
Control, RDC56
Manueverability, RDC71
Power, Calculated 1932.8
Head Points.31
Head Weight, %49.9%
Center of Percussion20.8
Dwell Time, ms8.82
Efective Stiffness - lbs27.6
K, Lb/In166,7
Recoil Weight143.69
Twist Weight229.04
End Weight 114.6
Tip Weight 200.3
9 O'Clock99.2
3 O'Clock99.4
Butt Cap114.9

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”

 

New Head Graphene 360 Radical! Here Now!

The new Head Graphene 360 Radical has arrived and I have already chosen the one for me!

The four (4) racquets in this series cover every possible player style and the new graphics package will appeal to most players.  This is a win-win Radical Series!

Head Graphene 360 Radical Series

Just in case you are wondering which one I have chosen it is the Radical S!   Why?  I handle a lot of racquets each day and this racquet just “feels” good when I pick it up!  Plus the 102 square inch head size fits me fine.

This series is the most impressive Radical Series I have seen in a few years.

You can read the reviews of each of these racquets on this site but you really should come by and take a look and “feel” for yourself.

My setup is going to be this racquet strung with PEEK at 52 pounds.  I am going to increase the weight to 315 grams and the swing weight to 315 kg/cm² as well.

I am anxious to start playing again and this is just the racquet to motivate me!   Motivate yourself, too!  Get one!

This is a comparison sheet of the four (4) models so you can get some idea as to which racquet may suit you!

Image 4-11-19 at 11.02 AM

Head Graphene 360 Radical Series Strung

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The Rebel Backpack and Radical 6 Racquet Combi add to the excitment of the new Radical racquets!  Complete the package with these bags!

String Bed Stiffness – A Short Video

It is raining today and it felt like a good time to talk about “string bed stiffness”…so let’s go!

This quick video will make a plea to you tennis players to demand more from your racquet technician so you are getting the most from your equipment.

Thank you for watching!

Dr. Goodman visits the World Headquarters!

We were thrilled to have Dr. Brad Goodman visit the World Headquarters to produce a session for his Doc-Talk-Live program!

Dr. Goodman is a tennis player who wants to know more about equipment in an effort to protect his body and beat his opponents.  You can catch this episode here: Doc Talk Live

In addition to the session Dr, Goodman was given the opportunity to “stretch” both a very stiff string and a very “stretchy” string, something that he, and many others, have not done.  Needless to say he was amazed at the difference.

Dr, Goodman’s visit was a great opportunity to have a real conversation about tennis equipment.  Please let me have your comments!

 

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