Physics Question about Throw

Dan White said:
OK, you've covered ob throw, but what is the cue ball doing? Does maximum ob throw also cause maximum cue ball drift in the opposite direction? In short, can you manipulate cb movement with english, or is it only possible to manipulate ob direction with english?
Click to expand...


No you really will not effect the CB with throw since sidespin has little or no effect on the bed cloth.

Yes you can use throw to cut down the angle that the CB contacts the OB at.You can also use throw with inside english to increase the angle of the shot and change the path of the CB.
 
smoooothstroke said:
No you really will not effect the CB with throw since sidespin has little or no effect on the bed cloth.

Yes you can use throw to cut down the angle that the CB contacts the OB at.You can also use throw with inside english to increase the angle of the shot and change the path of the CB.
Click to expand...

I could be wrong, but..

Using only side, the max transfer results in more side on the OB. Combining that with the above, about side having little effect on the cloth, the throw is actually less. I use side on banks that I want more rail action on, but less angle. I believe that I only get more angle on a light hit, when the CB gains a little forward roll with the side, spins off track a little and then glances off of the OB.

Using a little draw helps to transfer directional spin onto the OB to get it rolling foward with the angle of spin.

For example, if you were to swipe your finger sideways across a ball, it bumps forward with side spin. If you were to swipe it upwards a little(while going to the side), it creates diagonal spin that is given more direction with the friction of the felt. Viewed another way, spinning a ball sideways on the felt does nothing, a little forward to the side and it gets moving in that direction.

That's the way I understand it anyhow..
 
This my friend is a very, very good question

I have tested this theory on numerous occasions, and I have found that
1) YES, throw can definitely reduce CB drift down the tangent line after impact.
However,
2)the BIGGEST FACTOR in determining this tangential drift is SPEED at contact, and the best way to do this obviously is to kill the cue ball (This can be done with extreme low allowing the cue ball to almost start a normal roll at impact, i.e. no longer spinning backwards or rolling (Note: This method has also been known to cause skid with extremely dirty balls if and when the CB "turns over" at contact with the OB.)

TLDR;

In short, the best way to control cue ball drift after contact with the object ball would be to kill the cue ball speed as much as possible AND to throw the object ball. (If and only if it can be performed without losing the killing effect of the low). The best case scenario would be both maximum cue ball speed reduction using draw, AND side spin causing object ball throw.
A very effective way to reduce cue ball drift as much as possible without side spin, and to ensure shot-making percentage is still very high would be to just kill the cue ball.

If a player can use both low and outside without affecting the OB path too much, it would be ideal I believe.

You'll have to look at percentages and adjust according to YOUR game. The maximum amount of throw that can be achieved is about 3 - 5% as previously stated. If your shot-making percentage does not decrease this much by using it, then you should try to use this if needed. If you think your accuracy will go down down dramatically by using side spin, then just use low on the cue ball for almost the same effect.

I hope I did not confuse you with this post ;-)
 
Banks said:
I could be wrong, but..


For example, if you were to swipe your finger sideways across a ball, it bumps forward with side spin. If you were to swipe it upwards a little(while going to the side), it creates diagonal spin that is given more direction with the friction of the felt. Viewed another way, spinning a ball sideways on the felt does nothing, a little forward to the side and it gets moving in that direction.

That's the way I understand it anyhow..
Click to expand...

I'm sure many will argue that that is not 'technically' correct but it is a fairly good 'visual' explanation. Side with top or bottom creates diagonal & that moves the ball, a mini masse.
 
Williebetmore said:
Dr. D,
I have professional friends who swear they think INSIDE English will limit drift on cut shots more than a fuller hit with outside English. What say you? Has it been studied? Thanks.
Click to expand...
As CJ Wiley mentioned above, if you really want to kill the sideways movement, elevation and inside english is the way to go. In fact, you can get the cue ball to move the other way.
 
Williebetmore said:
Dr. D,
I have professional friends who swear they think INSIDE English will limit drift on cut shots more than a fuller hit with outside English. What say you? Has it been studied? Thanks.
Click to expand...
Check out these videos, where Tom Ross and I studied this for a particular type of shot:

And, as always, I agree with what Bob wrote. Extreme examples of using elevated inside can be found on the after-collision-masse resource page.

Enjoy,
Dave
 
Last edited:
I will often skid the cueball for similiar results. it seems to create a natural throw, so-to-speak. this also is useful when backcutting when the object ball and cueball are close to the pocket and its troublesome to go around the table caroming off rails. hope my descriptions are clear.

john
 
You must log in or register to reply here.
Back
Top