Author Topic: MB / PSA what is it.. how does it work? (Read 1534 times)

J_w73 · « **on:** December 16, 2008, 05:32:25 AM »

Learning about ball dynamics and what makes a ball do what it does.
I understand pin placement and why putting a pin in a certain place changes what the ball does.
What I know or think I know about the MB /PSA.. just found out the spot that is marked on the ball is not where the mass actually is. It marks the high RG axis. So basically the weight or mass is closest to the cover on a plane 90deg from this spot. The ball will spin to the MB/PSA when there is constant or added force .. ie a determinator. From the USBC axis migration study the ball's axis will not migrate to an axis of higher rg. So on the lane the ball will not migrate to the MB/PSA. Question is.. then how does the MB/PSA position make the ball do what it does. I am not looking for "it does this if you put it here or there".. I know what it does or is supposed to do. I am looking for why.

thanks in advance

Edited on 12/16/2008 2:48 PM

dizzyfugu · « **Reply #1 on:** December 17, 2008, 08:10:02 AM »

The MB marks a secondary force that comes into play when the ball rotates and moves - it marks the axis 90Â° to the pin axis which has the highest RG and upon rotation the biggest influence. While you can say the pin axis is a vertical axis through the ball that the core tends to stabilize towards, the mass bias defines the PSA, the preferred spin axis, aroudn which the core will stabilize horizontally while rolling forward. Or, as adiffernt idea, when you look from the top down the pin axis, the ball could stabilize while rotating in any 360Â° direction. The mass bias (as well as the CG in a milder degree) position tells the core into which direction it "wants" to roll. Sound complicated, sorry... a diagram would make it easier.

Balls with a considerable mass bias force the core and therewith the ball into a certain direction when it rotates. It is an additional force to exploit when you set up a ball.
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J_w73 · « **Reply #2 on:** December 17, 2008, 09:52:58 AM »

that is a pretty good explanation. Do you agree with my statement and the USBC migration study that shows on a lane the ball will not seek the PSA or rotate on its high rg axis. If the ball starts out on a lower RG it is not physically possible for the ball to move to a higher RG. This is because the ball would have to have added energy to get to a higher RG and the ball is not getting energy it only loses it as it goes down the lane.

So I am trying to find out.. since it doesn't go to the PSA what does the PSA make the ball do and why.

Edited on 12/17/2008 10:53 AM

Author Topic: MB / PSA what is it.. how does it work? (Read 1534 times)

J_w73

MB / PSA what is it.. how does it work?

dizzyfugu

Re: MB / PSA what is it.. how does it work?

J_w73

Re: MB / PSA what is it.. how does it work?