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03-13-2013, 12:30 AM #103
sure! try it tmr and provide your feed back
btw ever considered dividing the method into to types of grip, the short grip and the long grip?
i use the short grip more often as i play doubles almost all the time now, this is when the effect of a weight on the buttcap is the most significant, in affecting the agility of the swing/head
03-13-2013, 01:49 AM #104
Last edited by visor; 03-13-2013 at 01:54 AM.
03-13-2013, 02:20 AM #105
The moment of a (point load) is naturally affected by the distance from the point you where want to sum moments.
The only complication is that the racket weight is not evenly distributed along its length. Nonetheless, any distributed load can be replaced by an equal point load...
see if what your doing relates to the principles in the link: http://www.engin.brown.edu/courses/e...ts/moments.htm
Borbor liked this post
03-13-2013, 02:53 AM #106
Actually, this equation/relationship was only accidentally noted when I first started this thread. But despited being aware that my approach is overly simplistic in assuming the racket as a uniform beam, the equation still works very well to 3 significant digits.
Except for certain rackets like Voltrics with those head heavy "Tri-Voltage" bulges at the top skewing weight distribution to the top.
03-13-2013, 07:37 AM #107
2x Carbonex 880 Tour Pro with additional string and grip.
Length: Both 665 mm (I thought all rackets are 675 mm)
1. Weight: 100 g. Bp 280 mm. Head weight: 280/665*100= 42.1 grams
2. Weight: 102 g. Bp 286 mm. Head weight: 286/665*102= 43.9 grams
03-13-2013, 08:31 AM #108
Regarding the adding weight to the bottom thing: it might feel quicker/lighter because you're handling a higher overall weight and thus the head wt doesn't feel as heavy in comparison. That feel is just that though - a subjective feeling. Your muscles won't be any stronger or quicker than without that added weight, so they'll move the racket just as quickly as before, if not a little slower (as the weight added at the bottom will increase the moment of inertia if you grip the racket high).
If you're interested in testing that, take an adjustable dumbbell (those metal ones where you put on weight plates) and swing it around without any weights on the grip. Then add a weight below your hand (important that you grip at the same spot both times) and swing it again - are you really faster now?
03-13-2013, 09:45 PM #109
03-13-2013, 10:14 PM #110
4.1 The racket shall be a frame not exceeding 680 mm in overall length and 230 mm in overall width consisting of the main parts described in Laws 4.1.1 to 4.1.5 as illustrated in Diagram C.
Looks like it's 680mm max length.
03-14-2013, 06:38 AM #111
Nanospeed 200 with string and grip:
Weight 98 grams. BP 294 mm. Length 675mm
Head weight: 294/675*98 = 42.7 grams
Bravesword 12 with string and factory grip:
Weight 91 grams. BP 295 mm. Length 675 mm.
295/675*91 = 39.8 grams
I'm still not sure what this all means
03-14-2013, 07:31 AM #112
03-14-2013, 11:43 PM #113
03-15-2013, 03:10 PM #114
Can anyone here tell me the significance of head weight and swing weight? I currently interpret headweight as an estimate for ease of use, however I have a feeling that this is incorrect.
For example. I measured the specs on three different rackets with a karakal PU super grip + strings.
Vapor Trail Tour: 88.9g playing weight, 40.6g head weight, 310mm BP
4U Victor artery tec Ti-99: 89.7g playing weight, 40.1g head weight, 301mm BP (modded to this with 1g lead tape at 1' and 11' positions)
Lethal 70: 98.8g playing weight, 43.6g head weight, 297mm BP.
The VTT and AT Ti-99 have very similar head weight and are only off by 1g in overall weight, however the victor artery tec feels significantly more head heavy.
The Lethal 70 is only about 3g heavier in headweight, but it feels tremendously more difficult to use than either the VTT or At ti-99.
How should i interpret the above data?
03-15-2013, 04:20 PM #115
First off, 3g more head wt is a lot!
It can mean the difference
between a bs12 and a vztf!
I can already feel a difference in about 0.3g, so no wonder 10x that is much more noticeable.
Your ti- 99 head wt, is that measured with the lead tapes on?
Last edited by visor; 03-15-2013 at 04:22 PM.
03-15-2013, 05:30 PM #116
Hi Visor, thanks for the input!
Yes, the Ti-99 weight is with lead tape on. Just an experiment to increase the headweight to equal that of the VTT. I was surprised when it felt a lot more head heavy even when it had 0.5g less headweight.
Could headweight be used as a generalization of racket ease of use (Independent of frame shape/shaft stiffness/etc)?
03-15-2013, 06:09 PM #117
03-15-2013, 06:11 PM #118
03-15-2013, 07:59 PM #119