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PostPosted: 05 Dec 2021, 08:00 
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THE SLOW AND THE SPEEDY.
As being an inquisitive engineer geek, I picked up a dozen of broken balls and measured the thickness on the outer shell. Balls with a thinner shell proved to rotate faster, as is expected.
Attachment:
Broken shell jpg.jpg
Broken shell jpg.jpg [ 15.62 KiB | Viewed 2035 times ]


WHY DO ABS BALLS SPINNING AT LOW RATE.
The most apparent dissimilarity between balls of celluloid material and the ABS material is the rotation speed, and the celluloid is more spinny by general notion of players/ Why so?
The two materials are known to differ in density significantly. 1.1 g/cm³ ABS plastic vs 1.45 g/cm³ nitrozo celluloid. This is the very factor to cause the balls having different shell thickness. The celluloid balls will get much thinner shell compared to ABS, which can be verified by a simple household instrument.

According to the general laws of Mechanics, a sphere with a thick outer shell (=ABS material) will have a low spin rate.

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Last edited by igorponger on 04 Dec 2022, 03:34, edited 1 time in total.

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PostPosted: 10 Dec 2021, 15:39 
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Speedy.

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PostPosted: 04 Feb 2022, 00:09 
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Aan de oppervlakte lijkt het misschien alsof alle tennisballen gelijk zijn, maar als je wat beter kijkt, zie je dat er meer is dan je op het eerste gezicht zou denken.

Naast het complexe fabricageproces zijn er verschillende soorten tennisballen met verschillende materialen en constructies, ontworpen om aan de steeds groeiende vraag van spelers te voldoen. Hoe kies ik de juiste tennisbal?
Je hebt ballen nodig die duurzaam zijn en gemakkelijk om mee te spelen. Ze moeten een stuit hebben die bij je speelvaardigheid past en een beetje langzamer zijn (niet samengedrukt). U zult op zoek zijn naar een bal die langer meegaat. Hij moet een goede stuit hebben en je moet het gevoel hebben dat je hem onder controle hebt als je hem slaat.


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