Thread: 2014 Yonex New Racket (Voltric Z-Force II / VT-ZF2)

1. Originally Posted by sFrog
Since F=m x a and m is fixed due to defined shuttle mass, a is crucial.
Kinetic energy is= 1/2x m x v^2

so for a shuttle to result in a higher force it has to be faster as well if the same shuttles are used (thus about the same mass). If 19kg is the benchmark then the shuttle speed must be greatest as well.

Z-Speed... with v= 493km/h and m= 0,005kg
Kinetic energy= 1,2325J

Dunno how u see it but it's a lot. Still I don't know how Yonex compares it to the claimed 19kg.

I wonder how much force the 493km/h shuttle might have generated.
Actually its ~47 J.

0.5*m*v^2
= 0.5 * (0.005 [kg]) * ( (493 [km/h] * (1[h] / 3600[s]) * (1000[m] / 1[km]) )^2 = 46.88 [kg-m^2/s^2] = 46.88 [Nm] = 46.88 [J]

2. Originally Posted by sFrog
Since F=m x a and m is fixed due to defined shuttle mass, a is crucial.
Kinetic energy is= 1/2x m x v^2

so for a shuttle to result in a higher force it has to be faster as well if the same shuttles are used (thus about the same mass). If 19kg is the benchmark then the shuttle speed must be greatest as well.

Z-Speed... with v= 493km/h and m= 0,005kg
Kinetic energy= 1,2325J

Dunno how u see it but it's a lot. Still I don't know how Yonex compares it to the claimed 19kg.

I wonder how much force the 493km/h shuttle might have generated.
That's a good thought. Maybe they can consider doing the "smash the melon" act.

3. I am so tempted to get one, if nothing else because it looks so good.

Swung one around in a shop recently, feels agile enough, but no way to tell for sure until you actually bring one on to the courts.

4. ^ the racket is actually quick. As said before, 3U vtzf2 is faster than 4U vtzf1. I can back this up for I have experienced it. Not much quicker but noticeable! Smashing will be pure pleasure. No problem with me switching from 4U vtzf1 to 3U vtzf2. You cant go wrong with this one!

5. My 3U G5 came in the post finally. Freshly strung and all, just waiting for some overgrip tape while the string relaxes a bit in the meantime. Using BG66Ultimax @26lb in Black.

6. Also, not sure if people have talked about it, but, is it just me or the graphics near the T looks like stickers?

7. All of the graphics are stickers.

8. Cheers for the confirmation, didn't seem the ones at the top were but not that it really matters...
figured painted were the norm.

9. Actually its ~47 J.

0.5*m*v^2
= 0.5 * (0.005 [kg]) * ( (493 [km/h] * (1[h] / 3600[s]) * (1000[m] / 1[km]) )^2 = 46.88 [kg-m^2/s^2] = 46.88 [Nm] = 46.88 [J]

looks like I forgot to transform km/h into m/s and something else I don't recalculate yours. Thanks for the correction.

10. Does anyone have any advice or recommended techniques for stringing this racket?

I usually go 23lbs / 25lbs with ZM62. Given that this racket seems to be less isometrically shaped, and rounder compared to my others, should I stick with the 2lb difference between mains and crosses or change it?

11. got my 4u zf2 today, 28lbs bg66um.
sweetspot is almost the same as zsp.
zf2 is much more user friendly than zsp.
maybe zsp can perfome better in extrem condition, i think zf2 can do better in most cases for regular people. zf2 generate power easily if small sweetspot is not an issue. therefore, i would recommand advanced players try zf2.
i am pretty much impressed by zf2.

12. I went with 24 lbs mains and 25 lbs crosses. The head frame looks like some sort of cross between isometric and oval so I thought I'd just go with a 1 lb difference in tension this time. No idea if it's better or worse for the racket mind.

13. I did 10% on crosses and still came out the same so no worries

14. Ive tried both 24lbx26lb and 27lbx29lb on a 3UG5, for me it feels like you have to string at a higher tension to really bring out the power of the racket, although it does depend on the user if he/she has enough strength to put into the shot... thats what i think anyway different for everyone (all the same string, BG80Power with 10% prestretch)

Actually may consider increasing the tension by another 1lb or so from my usual 27x29lb

15. Originally Posted by Naim.F.C
I went with 24 lbs mains and 25 lbs crosses. The head frame looks like some sort of cross between isometric and oval so I thought I'd just go with a 1 lb difference in tension this time. No idea if it's better or worse for the racket mind.
The design has been devised so that the top of the head is larger than normal and the lower portion is smaller, so I think 1lb difference on the cross probably makes sense.

Has anyone ever done an actual calculation on this, or is it mostly anecdotal, from stringers trial and error?

16. Originally Posted by Deity
^ the racket is actually quick. As said before, 3U vtzf2 is faster than 4U vtzf1. I can back this up for I have experienced it. Not much quicker but noticeable! Smashing will be pure pleasure. No problem with me switching from 4U vtzf1 to 3U vtzf2. You cant go wrong with this one!
Deity, I have a 4u Zforce LTD. I am unsure of any differences between the standard ZForce and the LTD (if any) but am tinkering with the idea of getting a Z-force II for doubles...am I correct an assuming that the transition between the two is minimal?

17. Can anyone comment on the difference between 3U and 4U? How to choose between these two?

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