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Patrick Johnson
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07-18-2019, 02:39 PM

Quote:
Originally Posted by goettlicher View Post
Great answers.
So if I can move my cue stick at 10mph into contact. How fast in mph does the cue ball leave, assuming a fairly loose grip?
13-15 mph with any grip or none.

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vinay
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07-18-2019, 02:42 PM

Quote:
Originally Posted by goettlicher View Post
Great answers.
So if I can move my cue stick at 10mph into contact. How fast in mph does the cue ball leave, assuming a fairly loose grip?
Assuming a hard leather tip and an 18oz cue, about 13mph. Maybe about 14mph with a phenolic tip.

It might be possible to verify this with one of those apps that measures break speed along with some careful video analysis to figure out what speed the cue is moving at before impact, or some custom timing hardware I wish I had access to a real high speed camera, but those things are incredibly expensive.

I am actually curious about what's driving your interest here. Just curiosity or something else?
  
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07-18-2019, 02:45 PM

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Originally Posted by Patrick Johnson View Post
I think Bob and Dave and Mike are saying the soft skin of the hand effectively isolates the cue from your hand/arm during the millisecond of contact.
And any force that the grip hand might be exerting on the cue during contact would be too small to have any meaningful effect anyway compared to the extremely large force between the cue tip and CB. And many (if not most people) are exerting very little force with the grip right before contact anyway since the cue has already reached the desired speed at contact with the ball. That is clear in the acceleration plots in the various resources on the stroke acceleration resource page.

For those interested, here are some other resources that help back up some of these claims:

effects of light vs. tight grip

cue tip contact time

TP B.22 – How peak tip contact force and contact patch size vary with shot speed, and drop tests

There is some good discussion in this thread,
Dave
  
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07-19-2019, 05:12 AM

What’s a firm stroke?

What’s a medium stroke?

What’s a soft stroke?

This is a major issue for a lot of your test scenario..... Subjectivity on stroke speed. Not everyone will have the same opinion on what those speeds actually are.

Plus, why use a mph scale on the graph? In pool, we don’t deal in miles or hours, but in inches and seconds. Why not use inches per second?

Plus......does anyone know what range of speeds they stroke at? How can you gage if you are stroking at 1 mph or rather 17.6 inches per second.

I play a lot of 14.1, which requires a lot of slow rolling the balls. My firm stroke in playing 14.1 might be considered medium stroke for others playing 8 ball.

Last edited by duckie; 07-19-2019 at 05:17 AM.
  
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07-19-2019, 06:12 AM

Quote:
Originally Posted by duckie View Post
What’s a firm stroke?

What’s a medium stroke?

What’s a soft stroke?

This is a major issue for a lot of your test scenario..... Subjectivity on stroke speed. Not everyone will have the same opinion on what those speeds actually are.

Plus, why use a mph scale on the graph? In pool, we don’t deal in miles or hours, but in inches and seconds. Why not use inches per second?

Plus......does anyone know what range of speeds they stroke at? How can you gage if you are stroking at 1 mph or rather 17.6 inches per second.

I play a lot of 14.1, which requires a lot of slow rolling the balls. My firm stroke in playing 14.1 might be considered medium stroke for others playing 8 ball.
Feel free to post your research results.

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goettlicher
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07-19-2019, 06:19 AM

Vinay:
I was presented with this question in Pool School this weekend.
I was not prepared to give them an answer. I needed to know the real truth of the matter.
Now I am better armed because of this discussion board.
  
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