DHS D40+ to Be Released in April

I have to admit, I have wondered about that possibility myself (I posted it earlier as one of my "conspiracy theories".  But I ultimately figure there is not one ball that will fit "the Chinese style" because there is no one style shared by all CNT players.  Also it doesn't look like they do worse with ABS balls than before.

42andbackpains wrote: Just ordered last week and my order came in and the date code is XHAG. Can someone kindly tell me the month they were produced. I will compare them with a earlier batch i bought early this year. Thanks

42andbackpains wrote: Thanks BigFatLoop

I just received three boxes of D40+ (1 of XGAG, 2 of XFAG), and the seams look identical to the old D40+, which were received at the beginning of this year.

Just got another 72 from TTNPP (ordered before I got the thin seamed ones).

One factory and different machineries.

The new plastic includes many excellent ingredients. Nylon and sterene.



Edited by igorponger - 10/09/2017 at 2:18pm

igorponger is correct in that in a factory making lots of balls, DHS will have several production lines for the balls. The thin/thick seam balls could be from the same factory, just batches from different lines or days.

Nittaku in their oem deal with DHS will certainly stipulate quality control metrics that may even extend into set up specs of the production equipment and raw material quality.

Could be intentional. It is 100% certain that DHS will tweak production over time to increase efficiency.

Does the thin seam ball meet all the specs? Weight, diameter, bounce, veer, etc. If so then the balls are certainly genuine DHS. That's why it is important to actually get some real data.

It might be that someone accidentally changed a machine setting and made the seam thinner, and the balls still pass all the QC tests. This means that taking apart balls and measuring the seam is not part of the normal QC process. Maybe this machine continues to produce balls today.

It could also be that DHS does measure the seam and found some thinner and changed the process back to a thicker seam but decided it's ok to sell the thin seam balls.

I am sure there are more permutations considering DHS probably has many individual lines producing balls.

BTW, I did a multiball session with the thin seam balls. They are ok for multiball. I switch back to the thick seam balls for other practice and matches.

Given the resources of DHS, they would have prototyped many raw material process and ball configurations when developing the D40+.

For comparison, Nittaku was just granted US Patent #9623288 on its ABS ball in Apr 2017. If you scan through it, it is clear they spent a lot of time in R&D.

This chart in the patent shows balls with varying wall thickness versus results for bounce, sound, and strength. There are many charts like this in the patent. DHS would have done many of the same comparisons.

Well, I really tried to like those balls but they sound sooo bad. I can play with them, it’s not thaaat bad but they sound broken. What have they done?
So far the bad ones were all NOT from TT11, correct? Did anyone buy bad ones at a legitimate dealer?

Fabian1890 wrote: Well, I really tried to like those balls but they sound sooo bad. I can play with them, it’s not thaaat bad but they sound broken. What have they done? So far the bad ones were all NOT from TT11, correct? Did anyone buy bad ones at a legitimate dealer?

Edited by Egghead - 10/10/2017 at 7:37pm

Baal wrote: LUCKYLOOP wrote: Baal wrote: I am starting to favor the "one brand but two factories" hypothesis. Is it possible the Nittaku SD 40+ which is made in China and the thin seamed DHS D40+ are made in the same factory with the same mold using different labels ? I need to check some SD40+ to check the seam widths.  It is possible.

Egghead wrote: Got the D40+ from tt11 last week, thick seamed, <span style=": rgb251, 251, 253;">heavy and very good to play with.</span>

can someone post a list od the balls that are more easy to spin someballs are like antipips

Igor, for once you have posted something pretty interesting.  Thanks for this.

This is a really nice very carefully done study with conditions carefully controlled and measured.  They could control spin and speed and see what happened throughout the whole trajectory.  A coupled things I noticed in this paper.  Both the celluloid and plastic balls where Nittaku Premiums, which means the plastic were ABS.  An interesting detail is that the plastic balls were actually LIGHTER than the celluloid, although they were about 0.6 mm greater diameter. 

Translating from physics to table tennis language, they conclude that it should be easier to serve short with plastic balls.  Plastic balls tend to decelerate more when they are in the air, but topspin loop drives are going to "leap" faster off the table more and therefore be faster after collision with the table in the case of plastic.  Of course that means that there will be less spin remaining when the ball gets to the opponent's racket (and they did not analyze how the ball interacts with the rackets, only with the air and the table).  They specifically noted that because of the trajectory and faster deceleration of the plastic ball in the air, and it's higher bounce off the table in response to topspin, defenders will actually have MORE time to bring the ball back when their opponent attacks them, and that drop shots against defenders ought to be more effective.

Played with my new batch, me and my coach found them to be of no difference from the early batches. Maybe it was the DHS factory adjusting something or they had a bad batch of balls. 

Edited by 42andbackpains - 10/11/2017 at 2:33pm