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View Full Version : BALL DENSITY

JMR15RTC
05-02-2012, 22:33
Has anyone else noticed alot of variation in the density of the balls. When we shoot with all variables the same on the shooter some of the balls shot vary a great deal in distance. Our shooter is back to full speed for each shot and nothing else has changed. We are thinking it is a difference in the density of the balls. Anyone else have any thoughts? Thanks!
BJT
05-02-2012, 22:49
The biggest issue seems to be that the new ones have a skin and almost hold air like a regular rubber ball. after some handling, the skin gets lots of little holes and the ball compresses much easier and more quickly.
NJEchoAlpha
06-02-2012, 15:58
We tested, and the balls are varying slightly in weight and the weight is not evenly balanced throughout the ball.
Nathan Pell
06-02-2012, 16:18
Yes, we measured the three from the kit and two others we got from AndyMark and they vary about 20%. It is very frustrating.
Yankeefan181
06-02-2012, 17:43
We noticed that a few of the balls compressed a lot more than others and thus it's going to be interesting to see which teams can handle that and which can't. This is all very frustrating.
Wayne Doenges
17-02-2012, 13:55
We had the same experience. We had three roughed up balls and one new one. The three shoot well but the new one launches with twice the distance :ahh:
At the regionals they will probably start out with new balls which will gradually soften until one is destroyed and they put in a new one. That will be fun........NOT
Ether
17-02-2012, 14:42
Has anyone else noticed alot of variation in the density of the balls.

What you describe is not a variation of density. The ball is still roughly the same volume and mass.

The title of the thread should be "Coefficient of Restitution"

Google it.
its da PAT!!!
17-02-2012, 20:41
This is one of the challenges of this game. The best way to get away from this is to design a shorter that takes this problem out of play. Almost everyone with a wheel shorter is going to have a problem with this.
Tom Ore
17-02-2012, 20:48
We toyed with the idea of putting in a piston to squish the ball and measure deflection and then changing wheel speed to suit each ball.