NV 3.4 - 90° rule with various cut angles
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Uploader Comments (DrDaveBilliards)
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avoiding scratch, playing position, aiming carom shots, etc.
For more info, see "90 and 30 degree rules" and "position control" in the FAQ section of my website.
Dr. Dave
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Would the best practical use for this be avoiding scratches and setting up for the next shot?
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I cover this in detail in my April '05 BD article. You can view it on my website (billiards . colostate . edu).
The exact angle really doesn't matter. What does matter is being able to judge how much speed and tip offset to use for each shot, based on distance and table conditions, to get tangent line motion. That takes practice, not physics.
Regards,
Dr. Dave
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Everyone keeps advertising 90 deg and it sure looks like 90 deg, but is it really 90 deg? Since collisions are not 100% efficient, it is actually several degrees less (~3-4 deg). Not trying to nitpick, but omission of this "slight" difference has true practical significance if the carom target is say 10 feet away.
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i have a hard time of understanding hitting a ball with say, an 7/8 cut and still have the total separation angle at 90 degrees. it seems to make sense for cuts that are less than 3/4. please shed some light dr.Dave!
FateAtYourWindow 3 weeks ago
@FateAtYourWindow
With thicker hits, even a small amount of top or bottom spin has a very noticeable effect. The 90-degree rule applies perfectly only for a perfect stun shot, where the cue ball has no top or bottom spin when it hits the object ball.
DrDaveBilliards 3 weeks ago
Awesome, thanks a lot, Dr Dave.
HummerAlphamale22 11 months ago
@HummerAlphamale22
Thanks.
Check out my recently posted videos. There's some really good stuff there.
And please help spread the word,
Dr. Dave
DrDaveBilliards 11 months ago
Dr Dave,
How are the 30 & 90 degree rules affected when using the heavier cue ball found on most bar tables?
HummerAlphamale22 11 months ago
@HummerAlphamale22
See HSV B.49, a video I just posted recently. It covers all effects related to ball weight and size differences.
Enjoy,
Dr. Dave
DrDaveBilliards 11 months ago