Tang Peng

Visualizza: http://www.youtube.com/watch?v=TEp-gX4gFGM

Visualizza: http://www.youtube.com/watch?v=sse7QNfetNw

Visualizza: http://www.youtube.com/watch?v=bz2TPe5o3Lg

Visualizza: http://www.youtube.com/watch?v=COH815sav1Q

Visualizza: http://www.youtube.com/watch?v=VcghsUtnqu0

Visualizza: http://www.youtube.com/watch?v=JkeVJejncU4&feature=fvwrel


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Inoltre su questo sito How to Use Short Pips Table Tennis Rubber Successfully
non ho capito questi termini inglesi che ho colorato, soprattutto il primo e il secondo, qualcuno me li potrebbe spiegare

 

uuuh anche a me affasciana molto il puntino corto! grazie per i bei video!
Soft block credo sia semplicemente un block molto "ammortizzato" assecondi il moviemento della palla andando indietro con la racchetta, credo ne esca un block moscio, che probabilmente infastidisce, perchè è corto e ti spezza il tempo, il contrario di un block spinto insomma (prendi con le pinze tutto ciò, potrei dirti una gran cavolata, il mio allenatore mi ha consigliato di imparare anche a fare questo tipo di colpo, ma non gli ha dato un nome specifico, quindi magari potrebbe essere tutt'altra cosa )

il knuckle ball block è un mistero qua c'è un tizio che lo definisce in linea generale


In reference to your article on what makes a ball wobble I would have to say that your explanation is lacking - moving air (stray breezes) doesn't cause it. The answer lies in an understanding of fluid mechanics - in this case the fluid in question being air. (my Mechanical Engineering degree comes in handy here)

When a ball is spinning the flow of air around the ball is laminar. When the balls is moving through the air without spinning - or very little spinning - the flow is called turbulent. (picture the smooth flow over an airplane wing in a wind tunnel - that's laminar)

The ball transitions from one to the other unevenly - one side or part of the ball will lose its laminar flow and start to become turbulent - this is called "boundary layer separation." This separation on one side of the ball can create the effect of the "bottom dropping out" where the ball drops down suddenly towards the table - shorter than expected. In effect the spin on the ball has "stalled". A normally struck ball never spins down enough to do this within the length of the table.

The second effect in play here is that a ball with no spin at all will "buffet" in the air - oscillating from side to side as well as up and down, as it moves - you can see this effect clearly with knuckle ball pitchers in baseball. (Tim Wakefield being the best modern day example) In a slow motion replay the ball can be seen to "dance" left and right as it moves towards the plate. The turbulent motion with no boundary layer - will cause alternating low pressure areas on the sides of the ball (perpedicular to its motion) causing the ball to be drawn quickly to the side as it flies. The effect is identical to that of table tennis "wobble", and a baseball is clearly too heavy to be blown around by stray breezes.

Sorry about the explanation being pretty technical - but the real answers for things like this usually are.

Sempre quel Gregg che ha creato la discussione che hai letto, scrive di seguito come farlo:

I can only get a knuckle ball or Zig Zag ball ( as my coach calls it ) by backing off the block or chop block. I lift off the hit stroke as I hit the ball and try to just make contact with ball, then it will wobble like a fish on a line. But as I use sponge 1.2mm it is not a shot I can do offen normally only against lower level players and I do it for fun, Most top players just close their blade angle down and wack the ball, with good effect.

Cedo a qualche esperto del campo perchè a dire il vero anche da sta spiegazione in inglese ciò capito molto poco ma magari a te può servire ^^

 

cosa significa no comment??

 

Mi sembra ovvio... No comment !!! Troppo bello !!!

 

ah........ok