High-speed video of cue shots.

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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It is very interesting to see the longitudinal vibrations. I have written a simple simulator which predicts these but was never able to see them before. The simulator predicts (obviously) that the amplitude of the vibration will be larger with a harder tip due to the shorter contact time that causes more energy to be left in the cue stick as longitudinal compression. Have you been able to extract the amplitudes and frequency of the vibrations?

In the US there was an add-on product that was for these vibrations or maybe the transverse vibrations. It was a soft material that went on the end of the butt as a damper. If you have any spare time ;) you might try an experiment with such a thing.

Thanks again for your work.
 
Bob Jewett said:
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.
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A good illustration and explanation of this effect can be found here:

Bob Jewett said:
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.
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Good point, although it can still help some people to think: "Accelerate through the ball" or "Keep the tip on the ball longer" even though these things aren't strictly possible. These "imaginary mental images" might help them avoid decelerating into the ball, which can have negative consequences.

BTW, a lot more info (and video demonstrations) dealing with cue tip contact time can be found here:

Regards,
Dave
 
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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FYI, I've added links to your excellent resources, along with some others, here:

Again, great work!!!

Show us more if possible. Feel free to duplicate some of the stuff on my high-speed-video page if you want some ideas. Your camera is much better than mine.

Regards,
Dave
 
Thanks for posting this information. For me as a science guy, it is very interesting, and adds to a more complete model of the physics of billiards.

I think though, that the typical reader will be thinking, "How does this help me be a better player?"

So...what do you think the practical benefits of this type of research will be to players?
 
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Thank you for your kind words:smile:. We will try to make a lot of interesting video. But for this, of course, need a lot of time and patience. However, success also did not interfere.;)

Bob Jewett said:
First, thanks for the videos. Very nice quality.
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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Thanks for the correction and sorry for my english.:blush:
 
Bob Callahan said:
Thanks for posting this information. For me as a science guy, it is very interesting, and adds to a more complete model of the physics of billiards.

I think though, that the typical reader will be thinking, "How does this help me be a better player?"

So...what do you think the practical benefits of this type of research will be to players?
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Interesting question. I think it is important the eternal human desire for knowledge. Humans always wants to know why this happens :smile:. However, I think that there are practical benefits now too. First of all, for cuemakers. They can see some of the processes that help or hinder the cue stick strikes, conceived by the player.
 
We plan to repeat some shooting with pool cues and balls, which have already been made for the Russian cues. I think it will be interesting.

We plan to continue filming the series with increased attention towards the working of tips. This is one of the most important moments in the structure of the cue, and an understanding of the principles of how tips work is very important.

Have an idea to hold a series of shootings with different hardness tips at the same cue. However, it takes a long time to change the tips. It would be much more convenient to have several identical cues, so as not to lose time to replace the tip. For the Russian cue it is unrealistic, they are all unique. But for a pool cue is quite possible If we would have 3 or 4 of the same shaft. For example Predator.

Here in Russia purchase such shafts is very difficult. In addition, we are very limited in funds. Therefore, I have a request.

Maybe someone from AZ members interested in this project and can send 3 or 4 partial Predator shafts for the research. For soft, medium and hard tip, plus one control is desirable. I will be able to do a stiff butt for these shootings. It can get very interesting results.

Also available a series of shootings of different stiffness shaft, from a very hard hornbeam shaft to the shaft of a soft maple species. These shafts I can make, but several of the same I can not .
 
Bob Jewett said:
... Have you been able to extract the amplitudes and frequency of the vibrations?

In the US there was an add-on product that was for these vibrations or maybe the transverse vibrations. It was a soft material that went on the end of the butt as a damper. If you have any spare time ;) you might try an experiment with such a thing. ...
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Here is a thread about that vibration-damping product that just started: http://forums.azbilliards.com/showthread.php?t=263779
 
Mr. Bond said:
Horosho Mr. Komarov

Spasibo!
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Pozhalujsta :) :welcome:

This is some videos that I promised in addition.

"Go home"
http://www.youtube.com/watch?NR=1&v=IyEFl06j6Vw&feature=endscreen

Machine gun
http://www.youtube.com/watch?v=Z24qAezJdj4

Kiss-shot
http://www.youtube.com/watch?v=Z15pr3lPFzQ


STANDARD SHOTS

Draw shot
http://www.youtube.com/watch?v=vHVukoUUaBg

Follow shot
http://www.youtube.com/watch?v=5rEarbexUYw

Foul on the close pair
http://www.youtube.com/watch?v=4grN1WoXikY

Close pair by Follow shot (legal)
http://www.youtube.com/watch?v=dDqS2fgomQs


JUMPS
Weight of the ball 280 grams (9.9 ounces)!!!!

Jump through the ball
http://www.youtube.com/watch?v=Y5WeNlz8fJE

A bad jump through the coins
http://www.youtube.com/watch?feature=endscreen&NR=1&v=7cNyGJW_lFA

Do not stand in the way
http://www.youtube.com/watch?v=sOJQbs8ZHq8


DEFORMATION OF CUSHIONS

Pushing to the middle pocket
http://www.youtube.com/watch?v=Q3fBDzgUDVI

Pushing to the corner pocket
http://www.youtube.com/watch?v=KlPAVZz7j2I

close balls we sometimes call "the hares"
http://www.youtube.com/watch?v=tlYsJSr284E

deformation of the side in profile
http://www.youtube.com/watch?v=GBCSiGlixBU


For the following shots explain that in the Russian billiards cue ball, pocketed according to the rules, is counted as legal.

In Russia jump an object ball to pocket is often called a "basketball shot".

"Basketball shot" to the corner pocket
http://www.youtube.com/watch?v=WQ1cu0zFXY8

"Basketball shot" to the middle pocket
http://www.youtube.com/watch?v=F_Gvf3qSY0w

The pair close the middle pocket, or "Open the Gate, Cue Ball came.":)
http://www.youtube.com/watch?v=932igV1wVvg

Kick shot.
http://www.youtube.com/watch?v=kuFRXBnt6tM

cue ball 1
http://www.youtube.com/watch?v=a02pHqfxRrQ

cue ball 2
http://www.youtube.com/watch?v=68EpYIsP0iI
 
Recently made some new videos. But need the time to analyze it. For example here are a couple of controversial shots at close-standing balls.

http://www.youtube.com/watch?v=EHXWfQM26vE
http://www.youtube.com/watch?v=z7a8MLOmzcg

And one more news :thumbup:. Soon machine to simulate cue shot to be completed :dance:. Here the picture.
3576e2618b97.jpg


And the first video in work.
http://www.youtube.com/watch?v=cbo3hoiNf8g

Alexander Sorokin very purposeful person :clapping:. This high speed video and this machine is mainly his work. Let's all wish him success.:thumbup2:
 
Bob Jewett said:
Thanks for the new videos. The web site http://dbkcues.ru/ seems to have gone away. I hope it is a temporary problem.
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Thanks Bob. Quite a strange situation was, not have any notice or bills, which we have not paid. Nevertheless, the service has been suspended. But now everything is normal. :smile:
 
The new article of Alexander Sorokin describing the CUE testing unit. A very interesting additions to the design of the machine.:thumbup2:
http://dbkcues.ru/articles-2/cue-testing-unit/?lang=en
When testing the cue, especially in a comparative test, the main problem is subjectively factor. Well, is not given to man to accurately reproduce the motion and force of impact cue. Each time the strike would be any different from the last. Resolve this uncertainty can only mechanical system, which every time will execute one and the same operation, quite accurately repeating the same impact parameters. I admire the enthusiasm of Alexander Sorokin, who made such apparatus. What apparatus? Judge for yourself.
In my opinion the design is rather witty and reliable.
 
Thanks for the update.

I thought the contact time vs. stick speed graph was particularly interesting. I assume that the time was measured with with the high-speed video. I don't know of any theory that predicts that shape of dependence.
 
Interesting videos and machine. Look forward to see more viddeos in the future.

PS! I look forward too visit russia and play pyramid again in the future )
 
Thank you. I conveyed to Alexander your respect. :)

Siz said:
Wow! Very impressive. :thumbup:

Do you have copies of those graphs with the legends in english?
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You mean like this? A little later, I will change them on the blog.

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