Does energy return correlate to string power?

Discussion in 'Strings' started by Falloutjr, Sep 3, 2010.

  1. Falloutjr

    Falloutjr Banned

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    I was looking at Tennis Warehouse University numbers, specifically energy return, and I was wondering does this correlate directly to how powerful a string is?
     
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  2. Centered

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    Energy Return, what is it:

    "The percent of energy returned to the impact hammer by the string after impact compared to the hammer energy before impact."

    What it is is how much energy the string puts back into the ball.

    What you'll find if you sort the TW tested strings by energy return is that slow swings yield the most efficiency. The top 51 results are with slow swings.

    The first result with a medium swing is Pacific Tough Gut 16L at a 52 ranking, followed by Pacific Prime Natural Gut 16L at 58, Xcel 16 at 61, Legend 16 Uncoated at 63, and Pacific Classic 16 at 64.

    For fast swings, the first result is Pacific Tough Gut at high tension with a ranking of 175 and an efficiency of 97.8%. The next fast swing result is Kirschbaum Touch Multifibre 16 at medium tension with a ranking of 256 and an efficiency of 97.2%. I'm not sure what the margin of error is in these tests, but obviously a difference of .5% is negligible.
     
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    Top high tension fast swing results (greater than 96%):

    Wilson Natural Gut 17, 97.8
    Pacific Tough Gut 16, 97.8
    Babolat Tonic + 16, 97.0
    Pacific Tough Gut 16L, 96.8
    Wilson Natural Gut 16, 96.6
    Pacific Prime Natural Gut 16L, 96.6
    Klip Armour Pro 16/1.30, 96.6
    Gamma Asterisk Spin 16, 96.4
    Babolat VS Touch 16, 96.2

    Worst high tension fast swing results (lower than 87%):

    Luxilon Monotec Zolo 125/16, 86.7
    Yonex PolyTour 130/16, 86.7
    Luxilon M2 Plus 130/16, 86.7
    Boris Becker Bomber 17, 86.7
    Signum Pro Hyperion 16, 86.7
    Polyfibre Viper 17/1.20, 86.7
    Gamma Zo Power 16L, 86.7
    IsoSpeed Pulse 16, 86.7
    MSV Co.-Focus 16L, 86.7
    Prince Tournament Poly 16, 86.7
    Signum Pro Poly-Plasma Pure 17, 86.5
    Wilson Enduro Gold 16, 86.5
    Polyfibre TCS 17, 86.5
    Prince Poly EXP 17, 86.3
    Signum Pro Plasma HEXtreme 16L/1.25, 86.3
    Signum Pro Plasma Pure 16L/1.28, 86.3
    Polyfibre TCS Rapid 16L/1.25, 86.1
    Weiss Cannon Silverstring 120, 86.1
    Babolat Ballistic Polymono 16, 86.1
    Prince Tournament Poly 17, 86.1
    Polyfibre Poly Hightec 17, 86.1
    Polyfibre Cobra 17/1.20, 86.1
    IsoSpeed Pulse 17, 86.1
    Head Sonic Pro 16, 86.1
    Tourna Tourna Big Hitter Silver 17, 85.9
    Gosen Polylon 16, 85.9
    IsoSpeed Pyramid 16, 85.7
    Polyfibre TCS 16L, 85.7
    Kirschbaum Touch Turbo 1.30, 85.7
    Polyfibre Poly Hightec 16L, 85.7
    Wilson Enduro Tour 17, 85.6
    Polyfibre Viper 16L/1.25, 85.4
    Polyfibre Hightec Premium 17, 84.8
    Polyfibre Hightec Premium 16L, 84.3
    Polyfibre Hightec Premium 16/1.30, 84.1
    Polyfibre Poly Hightec 16/1.30, 81.2
    Polyfibre TCS 16/1.30, 80.8
     
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  4. Centered

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    Top high tension medium swing results (greater than 97.5%):

    Pacific Prime Natural Gut 16L, 98.8
    Babolat Xcel 16, 98.6
    Klip Legend 16 Uncoated, 98.6
    Pacific Classic Natural Gut 16, 98.4
    Babolat Super Fine Play 16, 98.4
    Gamma Revelation 16, 98.2
    Gosen Nanosilver 17, 98.2
    Gosen Powermaster II 16, 98.0
    Gamma Live Wire XP 16, 98.0
    Wilson Natural Gut 16, 97.8
    Tecnifibre X-One Biphase 16, 97.8
    Pacific Tough Gut 16, 97.8
    Pacific Tough Gut 16L, 97.6

    worst results at high tension, medium swing (less than 90.5%) – all are polys:

    Tourna Big Hitter Silver 17, 90.4
    Polyfibre Viper 17/1.20, 90.4
    Polyfibre Poly Hightec 17, 90.4
    Polyfibre Poly Hightec 16L, 90.2
    Gamma Zo Tour 16, 90.2
    Polyfibre Cobra 17/1.20, 90.2
    Prince Poly Spin 3D, 90.1
    Polyfibre TCS 16L, 90.1
    Polyfibre Hightec Premium 16/1.30, 90.1
    Klip Hardcore 16/1.30, 90.1
    Wilson Enduro Tour 17, 89.9
    Polyfibre Viper 16L/1.25, 89.7
    Polyfibre Hightec Premium 16L, 89.3
    Polyfibre Poly Hightec 16/1.30, 89.3
    Weiss Cannon Silverstring 120, 89.1
    Polyfibre TCS 16/1.30, 88.9
    Weiss Cannon Scorpion 1.22, 87.2

    worst non-poly: Gosen Nanocubic 16, 92.7
     
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  5. Centered

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    best results, high tension slow swing speed (greater than 99%)

    Kirschbaum Touch Multifibre 16, Nylon, 99.8
    Wilson Natural Gut 16, Gut, 99.8
    IsoSpeed Axon Multi 16L, Nylon/Polyolefin, 99.6
    Gosen AK Pro 16, Nylon, 99.4
    Tecnifibre XR3 16, Nylon/Polyurethane, 99.4
    Tecnifibre E-Matrix 17, Nylon, 99.2
    Gosen OG Sheep Micro Super 16L, Nylon, 99.2
    Gamma TNT2 16, Nylon, 99.2
    Gosen TecGut Remplir 16, Nylon/Polyurethane, 99.2
    Gamma Professional Spin 16, Nylon/Zyex, 99.2
    Klip Kicker 16, Nylon, 99.2
    IsoSpeed Pulse 17, Polyester, 99.2

    worst results, high tension slow swing speed:

    Signum Pro Hyperion 17 (1.24), 93.9
    Wilson Hollow Core 16, 93.9
    Luxilon Monotec Super Poly 1.25/16L, 93.9
    Signum Pro Poly Speed Spin 1.28 , 93.9
    Signum Pro Poly Megaforce 17 (1.19), 93.9
    Polyfibre TCS 16/1.30, 93.7
    Polyfibre Hightec Premium 16/1.30, 93.7
    Polyfibre Poly Hightec 16/1.30, 93.7
    Polyfibre Poly Hightec 18, 93.5
    IsoSpeed Pyramid 16, 93.5
    Gamma Zo Twist 16, 93.3
    Polyfibre Hightec Premium 17, 93.3
    Topspin Cyber Flash 16, 93.3
    Luxilon Adrenaline 16, 92.9
    Tecnifibre Polyspin 16L, 92.9
    Weiss Cannon Scorpion 1.33, 92.9
    Dunlop Comfort Poly 17, 92.7
    Polyfibre Poly Hightec 16L, 92.7
    Signum Pro Poly-Plasma Pure 17L, 92.4
    Polyfibre Viper 17/1.20, 91.2
     
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  6. Centered

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    Best results, medium tension, fast swing (95% or more):

    Kirschbaum Touch Multifibre 16, Nylon, 97.2
    Pacific Tough Gut 16L, Gut, 97.0
    Pacific Classic Natural Gut 16, Gut, 96.8
    Head FXP Power 16, Nylon, 96.2
    Pacific Prime Natural Gut 16L, Gut, 96.2
    Babolat Tonic + 16, Gut, 96.0
    Klip Legend 16 Uncoated, Gut, 95.8
    Klip Armour Pro 16/1.30, Gut, 95.8
    Babolat VS Natural Team Gut 17, Gut, 95.6
    Babolat VS Touch 16, Gut, 95.5
    Wilson Natural Gut 17, Gut, 95.3
    Wilson Natural Gut 16, Gut, 95.3
    Prince Premier W/ Softflex 17, Nylon, 95.3
    Head ETS 16, Nylon, 95.3
    Gosen Nanosilver 17, Nylon, 95.3

    Medium tension fast swing worst results (85% or less) – all are polys:

    Luxilon Big Banger ALU Power 125/16L, 85.0
    Ashaway MonoGut 16L, 85.0
    Leopard Plus Control 16, 85.0
    Luxilon Monotec Zolo 125/16, 85.0
    Boris Becker Bomber 16, 85.0
    Signum Pro Poly-Plasma Pure 17L, 85.0
    Prince Twisted 16L, 85.0
    Weiss Cannon Turbotwist 17 (1.24), 85.0
    Solinco Tour Bite 16, 85.0
    Signum Pro Hyperion 17 (1.24), 84.8
    Babolat Duralast 17, 84.8
    Signum Pro Poly Speed Spin 1.28, 84.8
    MSV Focus Evo 16, 84.8
    Kirschbaum Competition 16/1.30, 84.6
    Luxilon Big Banger XP 125/16L, 84.6
    Babolat Pro Hurricane 17, 84.6
    Pacific Poly Force Xtreme 16L, 84.3
    Solinco Revolution 16, 84.3
    Kirschbaum Pro Line I 1.30, 84.3
    Weiss Cannon Scorpion 1.33, 84.3
    Babolat Pro Hurricane Tour 17, 84.1
    Weiss Cannon Turbotwist 17L, 84.1
    Signum Pro Poly-Plasma Pure 17 (1.23), 84.1
    Luxilon Big Banger Rough 130/16, 84.1
    Luxilon Monotec Zolo 15L, 84.1
    Solinco Outlast 17, 83.9
    Babolat Pro Hurricane Tour 16, 83.9
    Prince Poly EXP 17, 83.7
    Yonex PolyTour 130/16, 83.7
    Kirschbaum Super Smash Spiky 1.20, 83.7
    Pacific ATP Poly Power Pro 16L, 83.7
    Babolat Duralast 16, 83.5
    Ashaway MonoGut 17, 83.5
    Boris Becker Bomber 17, 83.5
    IsoSpeed Pyramid 16, 83.5
    Volkl Cyclone 16 , 83.5
    Kirschbaum Spiky Shark 17, 83.5
    Solinco Revolution 17, 83.4
    Prince Tournament Poly 16, 83.2
    Klip Hardcore 16/1.30, 83.2
    Wilson Enduro Gold 16, 83.2
    Luxilon M2 Pro 125/16, 83.2
    Gosen Polylon Comfort 16, 83.2
    IsoSpeed Pulse 17, 83.0
    Kirschbaum Helix 16, 83.0
    Signum Pro Plasma Pure 16L/1.28, 83.0
    Babolat Ballistic Polymono 16, 83.0
    Kirschbaum Touch Turbo 1.30, 82.8
    Gamma Zo Tour 16, 82.8
    Luxilon M2 Plus 130/16, 82.6
    Weiss Cannon Silverstring 120, 82.6
    Gosen Polylon 16, 81.9
    Prince Tournament Poly 17, 81.9
    Prince Tour 17, 81.7
    Gamma Zo Power 16L, 81.7
    IsoSpeed Pulse 16, 81.5
    Prince Tour 16, 81.4
    Head Sonic Pro 16, 81.2
    Wilson Enduro Tour 18, 81.2
    Polyfibre Poly Hightec 18, 81.0
    Kirschbaum Super Smash 16/1.30, 80.8
    Babolat Revenge 17, 80.6
    Kirschbaum Super Smash Spiky 16/1.30, 80.6
    Polyfibre Poly Hightec 17, 80.5
    Kirschbaum Long Life 15, 80.3
    Prince Poly Spin 3D, 80.3
    Polyfibre Hightec Premium 17, 79.7
    Wilson Enduro Tour 17, 79.7
    Polyfibre Cobra 17/1.20, 79.6
    Polyfibre TCS 16L, 79.2
    Polyfibre Hightec Premium, 79.0
    Polyfibre Poly Hightec 16L, 79.0
    Polyfibre Viper 16L/1.25, 78.9
    Polyfibre TCS Rapid 16L/1.25, 78.7
    Polyfibre TCS 17, 78.7
    Polyfibre Poly Hightec 16/1.30, 78.7
    Polyfibre Hightec Premium 16L, 78.5
    Polyfibre TCS 16/1.30, 78.3
    Polyfibre Viper 17/1.20, 78.0

    worst non-poly results:

    Wilson Hollow Core 16, Nylon, 89.9
    IsoSpeed Energetic 17, Nylon/Polyolefin, 89.9
    Tecnifibre TGV 16, Nylon/Polyurethane, 89.7
    Head Fibergel Power 16, Nylon, 88.9
    Dunlop M-Fil Tour 16, Nylon, 88.9
     
    Last edited: Sep 3, 2010
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  7. Falloutjr

    Falloutjr Banned

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    Thank you, this is the list of results I'm most interested in. I'm still not quite sure I understand how you measure the power of a string in this matter then. Do these results imply that if you were to hit a racquet's stringbed with a ball traveling at 100mph, assuming the racquet is stable, that the ball would come off at 78 with Viper strings (the lowest energy return) and 85 mph with Lux BB Alu Power (the highest energy return)?
     
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  8. Centered

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    best results medium tension medium swing (greater than 97%):

    Pacific Tough Gut 16L, Gut, 98.8
    Pacific Classic Natural Gut 16, Gut, 98.6
    Wilson Natural Gut 17, Gut, 98.0
    Wilson NXT 17, Nylon, 98.0
    Babolat Addiction 16, Nylon, 97.8
    Klip Legend 16 Uncoated, Gut, 97.8
    Babolat VS Touch 16, Gut, 97.4
    Babolat VS Natural Team Gut 17, Gut, 97.4
    Babolat Xcel Power 16, Nylon, 97.2
    Klip Armour Pro 16/1.30, Gut, 97.2

    worst results medium tension medium swing (less than 87%):

    IsoSpeed Pulse 17, 86.9
    Head Sonic Pro 16, 86.9
    IsoSpeed Pyramid 16, 86.9
    Pacific ATP Poly Power Pro 16L, 86.9
    Prince Tournament Poly 17, 86.7
    Kirschbaum Super Smash Spiky 16/1.30, 86.7
    Klip Hardcore 16/1.30 , 86.5
    Polyfibre Poly Hightec 18, 86.5
    Gosen Polylon 16, 86.5
    IsoSpeed Pulse 16, 86.5
    Polyfibre Hightec Premium 16L, 85.9
    Polyfibre Viper 16L/1.25, 85.9
    Polyfibre Poly Hightec 16/1.30, 85.9
    Wilson Enduro Tour 17, 85.7
    Polyfibre TCS Rapid 16L/1.25, 85.6
    Polyfibre Hightec Premium 17, 85.6
    Prince Poly Spin 3D, 85.6
    Polyfibre Hightec Premium 16/1.30, 85.6
    Wilson Enduro Tour 18, 85.2
    Polyfibre TCS 16L, 85.2
    Polyfibre TCS 16/1.30, 84.8
    Polyfibre TCS 17, 84.8
    Polyfibre Poly Hightec 16L, 84.6
    Polyfibre Viper 17/1.20, 84.5
    Polyfibre Cobra 17/1.20, 84.5
    Polyfibre Poly Hightec 17, 84.1
    Pacific Poly Force 16L, 78.0

    worst non-poly results:

    Head Fibergel Power 16, Nylon, 92.7
    IsoSpeed Energetic 17, Nylon/Polyolefin, 92.2
    Tecnifibre Pro Mix 17, Nylon/Polyester, 92.0
     
    Last edited: Sep 3, 2010
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  9. Centered

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    Here are the best poly results for medium tension fast swing:

    (Note the nylon/poly blends)

    Dunlop Explosive Poly Max 16, Nylon/Polyester, 90.4
    IsoSpeed Energetic Plus 16, Nylon/Polyester, 90.4
    Gamma Zo Magic 16, Polyester, 89.3
    Tecnifibre Pro Mix 17, Nylon/Polyester, 89.3
    Tecnifibre Pro Mix 16, Nylon/Polyester, 88.9
    IsoSpeed Axon Mono 16L, Polyester, 88.7
    Pacific Poly Force 17, Polyester, 88.5
    Tecnifibre Pro Red Code 18, Polyester, 88.2
    Tecnifibre Pro Red Code 17, Polyester, 88.0
    Tecnifibre Black Code 18, Polyester, 87.4
    Tecnifibre Black Code 16, Polyester, 87.4
    Tourna Big Hitter Blue 17, Polyester, 87.2
    Klip K-Boom 16/1.30, Polyester, 87.2
    Weiss Cannon Silverstring 1.25, Polyester, 87.0
    Dunlop Comfort Poly 17, Polyester, 87.0
    Tecnifibre Black Code 17, Polyester, 87.0
    Luxilon Big Banger ALU Power Fluoro 17, Polyester, 87.0
    Babolat Pro Hurricane 18, Polyester, 87.0
    Gamma Monoblast 16, Polyester, 86.9
    Weiss Cannon Scorpion 1.22, Polyester, 86.9
    Tecnifibre Pro Red Code 16, Polyester, 86.9
    Signum Pro Poly Megaforce 16, Polyester, 86.9
    Wilson Enduro Tour 16, Polyester, 86.9
     
    #9
  10. Falloutjr

    Falloutjr Banned

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    I'm just looking for low-powered polys to try out, since I swing fast, Polyfibre is probably my best bet? I'll look at some of the reviews of those and look at how arm-friendly they are and how much access to spin they give.
     
    #10
  11. Centered

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    Everyone looking at these results should also keep in mind that there are quite a few strings that are missing from the Tennis Warehouse database. Here are just a few examples:

    Ashaway Dynamite Soft 17
    Ashaway Dynamite Soft 18
    Ashaway Dynamite 17
    Klip Zyex
    Gamma Professional 18

    The only data we have for a Zyex string is for one string, Ashaway's Dynamite WB 16, which is a very thick string at 1.41mm.

    Here are the numbers for it:

    Dynamite WB 16, Low tension, Slow swing, 124.0 stiffness, 95.3%
    Dynamite WB 16, Low tension, Medium swing, 109.7 stiffness, 89.3%
    Dynamite WB 16, Low tension, Fast swing, 104.6 stiffness, 85.0%

    Dynamite WB 16, Medium tension, Slow swing, 153.2 stiffness, 98.4%
    Dynamite WB 16, Medium tension, Medium swing, 137.2 stiffness, 92.9%
    Dynamite WB 16, Medium tension, Fast swing, 125.2 stiffness, 91.0%

    Dynamite WB 16, High tension, Slow swing, 172.0 stiffness, 96.6%
    Dynamite WB 16, High tension, Medium swing 153.2 stiffness, 95.1%
    Dynamite WB 16, High tension, Fast swing, 142.3 stiffness, 92.5%
    Dynamite WB 16, High tension, Fast swing, pre-stretched, 149.7 stiffness, 91.8%
     
    Last edited: Sep 3, 2010
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  12. Centered

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    These are the least efficient polys (low power) that also have low stiffness (arm-friendly):

    Polyfibre Cobra 17/1.20, Medium tension 51 lbs, Fast swing, no pre-stretch, 1.24mm, 154.3 stiffness, 32.2 total tension loss, 79.6% efficiency

    Polyfibre TCS 17, Medium tension 51 lbs, Fast swing, no pre-stretch, 1.21mm, 158.9 stiffness, 32.2 total tension loss, 78.7% efficiency

    Polyfibre Viper 17/1.20, Medium tension 51 lbs, Fast swing, no pre-stretch, 1.23mm, 157.7 stiffness, 32.6 total tension loss, 78.0% efficiency

    The closest non-Polyfibre string in terms of low efficiency and softness is this one:

    Wilson Enduro Tour 17, Medium tension 51 lbs, Fast swing, no pre-stretch, 1.25mm, 169.7 stiffness, 31.8 total tension loss, 79.7% efficiency

    Polyfibre Viper 17/1.20 fits your criteria the most.
     
    #12
  13. Falloutjr

    Falloutjr Banned

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    Yeah, it does, but with tension maintenance that poor, I'm not enthusiastic about how much I would have to restring (I tend to restring every 2 weeks or so). If I'm gonna have to restring every week or so, I'd rather go with the Wilson strings, those look like exactly what I'm looking for at a very good price :D thank you very much.
     
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  14. Centered

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    That Wilson string has a tension loss that's the same.

    The best you can do if you want a poly with fairly low tension loss and not too much stiffness is:

    Babolat Pro Hurricane 18, 185.2 stiffness, 19.0 lbs lost, 87.0%
    Boris Becker Bomber 17, 182.3 stiffness, 24.5 lbs lost, 83.5%
    Gamma Zo Tour Rough 16, 186.9 stiffness, 24.7 lbs lost, 85.9%
    Solinco Tour Bite 17, 181.2 stiffness, 24.7 lbs lost, 85.2%
    MSV Co.-Focus 16L, 184.6 stiffness, 25.1 lbs lost, 85.2%
    Solinco Revolution 17, 188.6 stiffness, 83.4%
    Solinco Outlast 17, 182.9 stiffness, 25.6 lbs lost, 83.9%

    There are no Wilson strings in this list. And, as for polys, there is no such thing as arm-friendly and durable. Arm-friendly polys lose tension. There is no free lunch with polyester. You have to go very thin (Pro Hurricane) to get some softness with decent tension retention.
     
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  15. Centered

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    For medium tension and a fast swing, you may want to check out Isospeed Axon Mono 16L:

    1.28mm, 199.5 stiffness, 17.4 lbs lost, 88.7% efficiency
     
    #15
  16. Falloutjr

    Falloutjr Banned

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    I actually an pretty familiar with PH18, I played with it a lot. Once I get my own stringing machine, I won't have qualms about having to restring every few days, especially with a string that's only 3 dollars a set, So the Wilson strings should be fine for me.
     
    #16
  17. DELPO

    DELPO Banned

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    LMAO, Centered flooding the thread with data *goes googly-eyed*
     
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  18. Centered

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    What Wilson strings?

    I don't see any Wilson strings that match your criteria better than the strings I highlighted.
     
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  19. Centered

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    Best results low tension fast swing:

    Pacific Prime Natural Gut 16, 94.3
    Pacific Tough Gut 16L, 94.1
    Klip Armour Pro 16/1.30, 93.7
    Pacific Classic Natural Gut 16, 93.7
    Babolat VS Natural Team Gut 17, 93.7
    Wilson Natural Gut 17, 93.7
    Wilson Natural Gut 16 , 93.7
    Dunlop X-Life Synthetic 15L, 93.3
    Babolat Tonic + 16, 93.3
    Klip Legend 16 Uncoated, 93.3
    Babolat Xcel Power 17, 93.1
    Babolat Xcel 16, 93.1
    Babolat VS Touch 16, 93.1
    Pacific Prime Natural Gut 16L, 92.7

    The Dunlop is a surprise, as it's the only synthetic string in the group and only costs $5.99. However, its stiffness is 145.2, while Pacific Prime 16 gut is only 81.2.

    Best "poly group" results—starting with the most efficient poly, low tension fast swing:

    IsoSpeed Axon Mono 16L, Polyester, 175.5, 87.2
    Pacific PMX 16L, Nylon, 121.7, 86.9
    Wilson Hollow Core 16, Nylon, 120.0, 86.9
    IsoSpeed Energetic 17, Nylon/Polyolefin, 144.6, 86.7
    Tecnifibre Pro Red Code 18, Polyester, 204.6, 85.9
    Tourna Big Hitter Blue 17, Polyester, 208.0, 85.9
    Babolat Pro Hurricane 18, Polyester, 171.5, 85.9
    Head Fibergel Power 16, Nylon, 125.7, 85.9
    Wilson Hollow Core Pro 17, Nylon , 122.3, 85.6
    Tecnifibre Pro Mix 17, Nylon/Polyester, 129.2, 85.6
    Tecnifibre Black Code 16, Polyester, 221.2, 85.4
    Tecnifibre Pro Red Code 17, Polyester, 214.3, 85.2
    Gamma Zo Magic 16, Polyester, 229.2, 85.2
    Signum Pro Poly Megaforce 16, Polyester, 85.2
    Ashaway Dynamite WB 16 1.41, Nylon/Zyex, 104.6, 85.0
    Tecnifibre Pro Red Code 16, Polyester, 218.3, 84.8
    Pacific X Force 17, Polyester, 212.0, 84.6
    Ashaway MonoGut 16L, Polyester , 181.2, 84.5

    Notice that Dynamite WB 16 1.41mm is less than half the stiffness of a poly with around the same energy return, making it a possible choice for big hitting players who want to save their elbows.

    Worst results in terms of efficiency at low tension fast swing speed, all are polys:

    Polyfibre Viper 16L/1.25, 142.3, 75.9
    Polyfibre TCS 16L, 137.2, 75.7
    Polyfibre Poly Hightec 16L, Polyester, 75.3
    Polyfibre Viper 17/1.20, 128.0, 75.2
    Polyfibre Hightec Premium, 154.3, 75.2
    Kirschbaum Spiky Shark 17, 153.2, 75.0
    Polyfibre Hightec Premium 16L, 150.3, 74.6
    Wilson Enduro Tour 17, 137.2, 74.5
    Polyfibre TCS 17, 126.3, 74.3
    Head Sonic Pro 16, 125.2, 74.1
    Polyfibre TCS 16/1.30, 149.2, 74.1
    Polyfibre Hightec Premium 17, 126.9, 74.1
    Polyfibre Poly Hightec 16/1.30, 153.7, 74.0
    Polyfibre Cobra 17/1.20, 125.2, 74.0
    Prince Poly Spin 3D, 138.3, 73.8
    Polyfibre TCS Rapid 16L/1.25, 125.7, 73.3
    Gosen Polylon Comfort 16, 137.2, 72.9
    Polyfibre Poly Hightec 17, 125.2, 72.8
    Wilson Enduro Tour 18, 124.6, 72.6
    Kirschbaum Helix 16, 149.2, 72.6
    IsoSpeed Pulse 16, 128.0, 72.2
    Polyfibre Poly Hightec 18 1.10, 109.2, 72.1

    This Polyfibre 1.10mm string is very soft and is the lowest in power of the tested strings. I have to wonder about the durability.
     
    Last edited: Sep 3, 2010
    #19
  20. DrpShot!

    DrpShot! Semi-Pro

    Joined:
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    How does this translate to reality? Is energy return an accurate guage of the power of a string?
     
    #20
  21. jmnk

    jmnk Professional

    Joined:
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    Messages:
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    that's the hard part. To make sense of any measurable experiment the numbers are derived when you hit a string with a metal hammer - meaning that the hammer is almost infinitely harder than the string. Which means that it does not deform, only the string does. There's a good book on it, I believe it's 'science of tennis' (or 'technology of tennis'). In that case, with the hammer, indeed almost all strings return about 90-95% of the energy.
    However when the ball hits the strings the ball itself deforms quite substantially, and the ball returns only about 25% of its energy. Which means the more the ball deforms the more energy will be lost, the less the rebound speed will be. The more the string stretches on impact the less the ball deforms, and therefore the more rebound speed will be. Which is really the reason why gut is considered more powerful (because it stretches a lot meaning the ball will deform less) while poly is less powerful (because it stretches the less and therefore the ball deforms more) - even though pure numbers of 'returned energy' are not that far off between gut and poly.
    The truth is that there are so many factors involved that it is hard to make an exact science out of it. You can try to measure one aspect at a time - but practice may 'feel' quite different.
     
    #21
  22. DE19702

    DE19702 Rookie

    Joined:
    Aug 17, 2006
    Messages:
    194
    This is a great thread and everyone should permanently bookmark it. I just tried Klippermate Zyex just to see what it would do and I believe it matches up with the data for the other zyex strings. I strung my Diablo mid at 46. I have a relatively fast swing. My first few returns of serve were short and landed in the net. It seemed the harder I swung the less powerful it got. It took a little getting used to and I had to reduce my swing speed - the opposite of what you would think. At the net on volleys where I didn't swing it went back with quite a bit of power. Once I got used to it, I did well with it. Slices went back with a lot of power. Spin potential was good and I don't think I hit a long ball all day. First serves were not as powerful as I am used to. Second serves were average. I think it would be a great string for an average player strung below 50. I would try it at 54 the next time. They recommend stringing 10-20 percent lower because it holds tension well.
     
    #22
  23. taurussable

    taurussable Professional

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    Oct 2, 2012
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    did we have a yes or no answer to this question?
     
    #23
  24. ricardo

    ricardo Professional

    Joined:
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    Messages:
    827
    I will give you a definitive answer: YES

    I will give you a definitive answer: YES.
    energy return correlate to string power.

    We all know from actual hitting experience that NG is the most powerful string and poly the least powerful string. Multi/syn gut are in between.

    Your next question then would be,
    Will the most powerful string produce a shot with the most ball pace?

    Not necessarily.
     
    #24
  25. taurussable

    taurussable Professional

    Joined:
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    without the need control the ball, I would assume the most powerful string produces the fastest ball. If you need to consistently get the ball in AND produce the most pace, then it is not necessarily the case as you stated.
     
    Last edited: Jul 3, 2013
    #25
  26. ChicagoJack

    ChicagoJack Hall of Fame

    Joined:
    Aug 11, 2005
    Messages:
    2,268
    Ricardo - It's no biggie, just FYI, Poly is not the least powerful string. Kevlar has that distinction by a wide margin. Kevlar is 3X (300%) stiffer than the stiffest poly, and 9X (900%) stiffer than gut.

    Tarussable - No need to resurrect this wacky old thread for that answer. The answer is yes, and everything you could ever want to know about string power, ACOR, and energy return can be found in the links provided below. The key thing to understand about string power is ball compression. Ball compression is wasted energy. Softer strings allow the string bed to deflect and stretch on impact, so the ball squashes less, which results in higher ball velocity. That is a way too short, travesty of an explanation, but the links can sort you out from there.

    http://twu.tennis-warehouse.com/learning_center/articles.php#string

    http://twu.tennis-warehouse.com/learning_center/stringsandpower1.php

    http://twu.tennis-warehouse.com/learning_center/stringstiffness.php

    http://twu.tennis-warehouse.com/learning_center/howstringworks.php

    -Jack
     
    Last edited: Jul 4, 2013
    #26

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