wrveres wrote:I had no Idea that anything was in them... Is there a ball inside the disk that spins or something? what makes one ball spin more vs. another?
and I guess those black balls at the Lanes don't have these disks right?
The inside of a bowling ball is solid. Manufacturers are not allowed to make a ball that is hollow inside, which means no moving parts.
What makes the ball hook, is due to the shape of the weight block, and the revolutions that a bowler puts on the ball. It's like throwing a weeble wobble, except that you can't see the odd spinning inside of the ball due to it being a perfect circle. Once the ball passes through the oil and into the dry portion of the lanes, the revolutions that a bowler puts on the ball takes over.
Take a look at the link I gave you. Look at the graph. See that the X-Factor (in purple) has a lot more hook than the Hot Wire (in grey). That's due to different weight blocks and that the covers of the balls are made of different materials.
Now lots of hook, doesn't mean high scores. It's all a matter of lining up correctly and making good shots. I've won tournaments hooking the ball across the entire lane, and I've won them playing very straight, much like the Hot Wire's graph.
The biggest factor in bowling is also the amount of oil. How heavy? How long of a pattern? What type of pattern? etc.
Did I mention that I'm a certified instructor?
No, the black balls at the bowling center do not have a disk.
Just a circular block in the center of it to give it the right weight.

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