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Unexpected result in speed comparison

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mjamja View Drop Down
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    Posted: 05/17/2019 at 5:18pm
Just glued a new sheet of Spectol Red (short pips) on my Clipper.  Doing a ball bounce test the new Spectol seemed significantly faster than the Tenergy 25 on the other side.  I did use rubber cement so maybe it is just glue effect.  T25 sheet is about 3 months old.

Mark


Edited by mjamja - 05/17/2019 at 5:18pm
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mhnh007 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mhnh007 Quote  Post ReplyReply Direct Link To This Post Posted: 05/17/2019 at 5:23pm
The PIPs are harder on SP, so on bounce test SP will appear faster.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mjamja Quote  Post ReplyReply Direct Link To This Post Posted: 05/17/2019 at 6:20pm
Originally posted by mhnh007 mhnh007 wrote:

The PIPs are harder on SP, so on bounce test SP will appear faster.

Good to know.  The first time I put on the Spectol I must not have done the bounce thing (or my senile senior mind has no memory of it).

Mark
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pingpungpeng Quote  Post ReplyReply Direct Link To This Post Posted: 05/17/2019 at 6:52pm
also tenergy 25 is not so fast.
it's the slowest tenergy.
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igorponger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 05/17/2019 at 8:35pm
   PRICEY EXPERIMENT ....   

Dynamic tests needed.   Ball impact speed on the rubber ought to be of minimum 20 m/sec.
Machine to project ball at so high speed will cost you a fortune of 200 000 USD.
The speed, spin and angle of the reflected ball are measured automatically and the friction - and other properties - computed.    Unfortunately, the only such device we know of is owned by its developer, Butterfly Tamasu researh group, Tokyo, Japan .

Be happy/

Edited by igorponger - 05/17/2019 at 8:38pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote haggisv Quote  Post ReplyReply Direct Link To This Post Posted: 05/17/2019 at 10:51pm
I would expect the Spectol Red to be faster than T25. For pure speed, short pimple are often faster because all your energy goes into speed and much less into spin.
Smart; VS>401, Dtecs OX
Tenergy Alternatives | My TT Articles
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ericd937 Quote  Post ReplyReply Direct Link To This Post Posted: 05/17/2019 at 11:48pm
Spectol Red in max sponge? 
Current Setup:
Sittiho Hinoki ALC, Baracuda(max), Dignics 05(max)
Official USATT Rating 1815
Current estimated level: Bad Day ~ 1900 Good Day ~ 2100 (In Asia since 2015, no USATT events here)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mjamja Quote  Post ReplyReply Direct Link To This Post Posted: 05/17/2019 at 11:57pm
Originally posted by ericd937 ericd937 wrote:

Spectol Red in max sponge? 

Yes, max sponge
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mykonos96 Quote  Post ReplyReply Direct Link To This Post Posted: 05/18/2019 at 2:08am
Originally posted by mjamja mjamja wrote:

Originally posted by ericd937 ericd937 wrote:

Spectol Red in max sponge? 

Yes, max sponge

Spectol blue is faster
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Lula View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lula Quote  Post ReplyReply Direct Link To This Post Posted: 05/18/2019 at 3:08am
In my experience short pimples is almost always much slower than inverted. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote zeio Quote  Post ReplyReply Direct Link To This Post Posted: 05/18/2019 at 3:30am
Raw pips for attacking like Spectol and its variants are actually among the fastest rubbers you could get. Generally speaking, they have the highest COR.

Typical non-inverted rubbers are closer to inverted in terms of speed.

Inverted has the best balance b/w speed and spin.

Edited by zeio - 05/18/2019 at 3:31am
Viscaria FL - 91g
+ Neo H3 2.15 Blk - 44.5g(55.3g uncut bare)
+ Hexer HD 2.1 Red - 49.3g(68.5g 〃 〃)
= 184.8g
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aerial View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote aerial Quote  Post ReplyReply Direct Link To This Post Posted: 05/18/2019 at 3:10pm
COR = ???
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Skyline Quote  Post ReplyReply Direct Link To This Post Posted: 05/18/2019 at 3:24pm
I have to agree with Lula here, short pips are slower compared to inverted. Even the fastest short pips slow the ball down and make it dead. You will notice this when you start flat hitting hard. At first it's reallly fast and then the ball slows down significantly after it has bounced on the opponents side.
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