High-speed video of cue shots.

DBK said:
Dear Dr. Dave. If you find this video interesting enough to publish it in your video library, we will not have any objection. This applies to our video which will be in the future. Consider this a formal resolution. Thank you.
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Thank you. I will add links to all of your stuff as soon as I can find some time. I'm very busy the next two weeks, but I'll get to it soon.

Regards,
Dave
 
DBK said:
This is simply an unsuccessful attempt to perform masse. Unplanned and unsuccessful experiment. Shown only for fun :). Do not take it seriously.:wink:
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Not taking it seriously. I just found the actual motion quite interesting and beautiful. I think most people wouldn't agree that the shaft and cue ball could contact each other multiple times like that on a miscue.

Thank you for the videos.
 
DGunter said:
@Jal Not gonna lie...my head just assploded a little bit.
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Sorry about the trauma, whichever end it occurred at. :) :) :) On a lighter note, though, trying to express in the vernacular what is best described succinctly with math can be a challenge, at least for some of us. You tend to get a little wordy and end up making it seem more complicated than it is.

Jim <--- has never, ever done that
 
Another couple of HS-video. Now 24,000 fps.! Cool :thumbup:. And one video for fun:). What happens with hand on V-bridge when is Miscue? Nightmare :shocked2::). Homo sapiens = more than 80% of water.:D

HS-video 24,000 fps.

Here, the central shot. The first - cue with fenolik tip. This was necessary to have a reference point of contact time of net cue, without a leather tip. Characteristically, the contact time is almost independent of the cue speed in the first case with phenol tip, and is about 0.8 milliseconds.
Contact time the cue with the usual tip depends on the speed of the cue, and the smaller, the higher the speed of the cue. The pictures show the time of contact the cue tip with the cue ball, depending on the speed of the cue.

44b89f145701.jpg


6dcb3e973406.jpg

Re.: (The inscriptions on the pictures, the vertical axis - the contact time (ms), the horizontal axis - cue speed (m / s), at the first at the top (Oleg's cue), the second top (Dmitry Komarov's cue)
 
DBK said:
Another couple of HS-video. Now 24,000 fps.! Cool :thumbup:. And one video for fun:). What happens with hand on V-bridge when is Miscue? Nightmare :shocked2::). Homo sapiens = more than 80% of water.:D

HS-video 24,000 fps.



44b89f145701.jpg


6dcb3e973406.jpg

Re.: (The inscriptions on the pictures, the vertical axis - the contact time (ms), the horizontal axis - cue speed (m / s), at the first at the top (Oleg's cue), the second top (Dmitry Komarov's cue)
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Very interesting. What is the difference between your tip and Oleg's? There seems to be a big difference in contact times at low speeds. Was it the same person using both cues?
 
DBK said:
Another couple of HS-video. Now 24,000 fps.! Cool :thumbup:. And one video for fun:). What happens with hand on V-bridge when is Miscue? Nightmare :shocked2::). Homo sapiens = more than 80% of water.:D
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That's great. I don't know if this has any bearing on the discussion but whenever I shoot with a Predator shaft and miscue then it raps my knuckles like someone hit me with a ruler. It actually hurts and even more so if I shoot with a P2 (the one with the spliced butt).

This is the only cue where that happens to me.
 
Thanks for the videos, guys.

The most interesting fact that the videos show (for me) is, that the tip of the shaft initially can bend towards the cueball. This definitely classifies the "bending" of the cue stick as a result of an impulse generating waves which travel the shaft, as opposed to some more "common" magical force interpretations. This also seconds your piezzo experiments.

What I'm interested in all the "squirt" discussion are the effects in relation to each other:

- Endmass: To which average percentage does it contribute in different material and taper situations
- transverse waves: to what degree do they tend to increase end mass, and what's the average percentage they contribute to squirt for typical cue materials and builts.
- longitudinal waves: pretty much the same.

More or less a decomposition of squirt into these factors.

Regards
Gwenn
 
Thank you all for your attention to the topic.

Siz said:
Very interesting. What is the difference between your tip and Oleg's? There seems to be a big difference in contact times at low speeds. Was it the same person using both cues?
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My friend Oleg and I have provided cues for these experiments. In the video Oleg's cue fenolik tip and on my MooriM. Cues a little different in characteristics, so the contact time is different. What parameters affect the correct play the cue is not yet clear. We still have to check. Yes, all the shots played by one person.
 
Gwenn said:
Thanks for the videos, guys.
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Welcome :)

Gwenn said:
The most interesting fact that the videos show (for me) is, that the tip of the shaft initially can bend towards the cueball.
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Here, everything is logical. Because the tip contacts the cue ball only by the one side appears the moment of force that bend the shaft towards the cue ball in the first instant of contact. This was expected, but we could see only now.


Gwenn said:
What I'm interested in all the "squirt" discussion are the effects in relation to each other:

- Endmass: To which average percentage does it contribute in different material and taper situations
- transverse waves: to what degree do they tend to increase end mass, and what's the average percentage they contribute to squirt for typical cue materials and builts.
- longitudinal waves: pretty much the same.
More or less a decomposition of squirt into these factors.
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Thank you.

We are planning several more series videos. Maybe this will be a variation with endmass and its effect on the cue ball throw. It might be an attempt to take the video full length cue to see the waves. Maybe will be a series of videos with pool cues.

Concerning the analysis of the resulting video, it's not a quick thing. Most likely for the long winter evenings:). So join us:wave3:. I will try to put every video in the as a set of individual frames. I will give this link further.
 
I can't see any ferrule in this article :o
But fyi DBK installs such a ferrule on all his shafts since 2 years afaik.
BTW it's about russian pyramid balls in this article.
 
SUPERSTAR said:
Disclaimer. This is NOT an attempt to knock the videos!!

From the video, it doesn't look like they are laying a very good stroke on the cueball.
Kind of looks like a poke stroke.

I might be way off, but it almost looks like they are bunting the ball with no follow through. Almost stopping after contact. With zero hang time for the tip on the cueball.

I only say this because of the speed at which the cueball leaves the tip, and the increasing distance between tip and cueball after the shot.
It seems like it's too much distance, too fast, especially for slow-mo.

Maybe that is a result of the slow-mo effect, but something just doesn't look right.

But either way, thank you for the videos.
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It is the effect of the slow motion. When the stick hits the ball, the cue slows down almost instantaneously to 50% of its speed just before contact. At the same time, the cue ball leaves the tip with about 130% of the speed of the stick just before contact. This effect is seen in all the high speed pool videos. I agree that it looks very strange, but that's the way that shots work. It gives you a completely different view of stroke and such.

The hardest part of these videos for some people to accept is the very short contact time. Some players think it is very important to increase the contact time, but by studying the videos you can see that it is probably neither possible nor desirable to do that.
 
First, thanks for the videos. Very nice quality.
DBK said:
...
We are planning several more series videos. Maybe this will be a variation with endmass and its effect on the cue ball throw. ...
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In American English, it is not called "throw". It is called "squirt" or "cue ball deflection". The word "throw" for most American pool players means the sideways effect of friction at the contact point between balls and has nothing to do with cue stick characteristics.

I think UK/snooker players do refer to the effects of endmass as "throw."
 
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