How is this swingweight scenario even possible?

Discussion in 'Racquets' started by pmata814, Feb 20, 2014.

  1. pmata814

    pmata814 Professional

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    I have an IG Radical Pro that weighs 11.5 oz and is 6 points HL. I also have a Rebel 98 that weighs 11.5 oz but is only 2 points HL; however, the IGRP seems to have a much higher swingweight. I haven't measured it but it is very obvious when I play witht them side by side. The Rebel swings so much faster that it takes me a while to adjust to the lighter swingweight when I switch.

    So what has me confused is: Isn't swingweight simply a product of static weight and balance? If both racquets weigh the same and the IGRP is 4 points more head light, shouldn't it swing lighter as well? :confused: What am I missing?
     
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  2. Lukhas

    Lukhas Legend

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  3. corners

    corners Legend

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    No! Swingweight is a product of how much mass is in the head of the racquet. Where and how much mass is in the throat and handle determine the static weight and balance point. This is an oversimplification, but should help you understand.
     
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  4. ls206

    ls206 Professional

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  5. robbo1970

    robbo1970 Hall of Fame

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    But I do know what the OP means. If the static weight is the same but you are swinging a head that is lighter, then surely the swingweight is lower, but it doesn't work like that, it's weird.
     
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  6. TimothyO

    TimothyO Hall of Fame

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    The key to understanding the situation is that there a multiple ways of achieving any given balance or SW and while mass in a SW calculation has a direct relationship between the SW and its location along the length of the frame mass in balance measurement is always relative to mass elsewhere on the frame.

    In other words, adding mass at the tip/12 will ALWAYS increase SW. But if you also add mass at the butt then balance won't change.

    The way SW is calculated also effects the situation. It's calculated from a point on the handle resulting in this bizarre situation:

    Go to the Tennis Warehouse University customization worksheet found here:

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

    Add 16,000 ounces (yes, 16,000 ounces or 1,000 pounds) at a point 10cm up the handle. According to the SW calculation YOUR SWINGWEIGHT WON'T BUDGE.

    That's right. According to the SW formula there's no difference between swinging a 12 ounce frame with a SW of, say, 320, and a freakin' 1,000 POUND frame with a SW of 320. According to reference SW, a 12 ounce frame and a 1,000 pound frame are equally difficult to swing and generate the same power.

    Some in the industry and many TT members put a lot of stock in SW and use it as a common reference point. But the fact that it can't distinguish between a 12 ounce frame and one weighing about 1,000 pounds tells you everything you need to know about the value of SW. It's ok when trying to match two frames of the exact same model and nearly identical weight/balance off the shelf. And that's about it. And because it can't accurately describe the effect of mass you can have two frames with the same SW, balance, mass, flex, head size, string pattern, etc. and they can still feel completely different.*

    *Technically you can shift the SW reference point from 10cm to something like -30cm or more and you get something closer to the court situation.
     
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