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dr_dave
06-09-2008, 06:47 PM
FYI, I just posted another new collection of instructional videos. Many of them include super-slow-motion high-speed camera footage. I filmed the video for these clips a couple of weeks ago with the help of Tom Ross and friends. I look forward to your comments, feedback, disagreements, suggestions for the future, and/or questions. Here are the new clips:

NV B.25 - Using draw and English to beat a scratch in a side pocket, with Tom Ross (http://billiards.colostate.edu/normal_videos/new/NVB-25.htm)

NV B.26 - Draw shots near a rail, with Tom Ross (http://billiards.colostate.edu/normal_videos/new/NVB-26.htm)

NV B.27 - Rail-first draw kick safety, with Tom Ross (http://billiards.colostate.edu/normal_videos/new/NVB-27.htm)

NV B.28 - Pocket point compression shot (http://billiards.colostate.edu/normal_videos/new/NVB-28.htm)

NV B.29 - Shortening the cue ball rebound angle with draw and reverse English, with Tom Ross (http://billiards.colostate.edu/normal_videos/new/NVB-29.htm)

HSV B.23 - cue ball path speed, spin, and cue elevation effects (http://billiards.colostate.edu/high_speed_videos/new/HSVB-23.htm)

HSV B.24 - draw shot with elevated cue and hop over an obstacle ball (http://billiards.colostate.edu/high_speed_videos/new/HSVB-24.htm)

HSV B.25 - kick rebound-angle speed, English, and spin effects (http://billiards.colostate.edu/high_speed_videos/new/HSVB-25.htm)

HSV B.26 - overspin with a follow shot (http://billiards.colostate.edu/high_speed_videos/new/HSVB-26.htm)


FYI, all of my online instructional videos (NV and HSV) can be found here:

http://billiards.colostate.edu

Enjoy,
Dave

1Time
06-09-2008, 08:49 PM
dr_dave,

I'm still waiting for your pool "basics" series of videos that will better help the vast majority of pool players and grow the sport. Thanks

dr_dave
06-10-2008, 08:04 AM
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 1Time</div><div class="ubbcode-body">dr_dave,

I'm still waiting for your pool "basics" series of videos that will better help the vast majority of pool players and grow the sport. Thanks </div></div>I think my current "chapter" videos supporting my book (http://billiards.colostate.edu/normal_videos) do a decent job of covering many pool basics, but I do plan to do a new video (or videos) on aim, stance, grip, bridge, and stroke. What else do you have in mind?

Regards,
Dave

1Time
06-10-2008, 10:25 AM
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dr_dave</div><div class="ubbcode-body">I think my current "chapter" videos supporting my book (http://billiards.colostate.edu/normal_videos) do a decent job of covering many pool basics,</div></div>
I could not easily find links to the videos to which you refer. I would like to look at them if you provide direct links.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dr_dave</div><div class="ubbcode-body">but I do plan to do a new video (or videos) on aim, stance, grip, bridge, and stroke. What else do you have in mind?</div></div>Yes, this is what I am waiting for, videos showing the fundamentals that will most help the vast majority of players and grow the sport. Thanks

Jal
06-10-2008, 02:17 PM
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dr_dave</div><div class="ubbcode-body">FYI, I just posted another new collection of instructional videos....</div></div>
Dr. Dave, great stuff as always. Thanks to you and Mr. Ross.

I think you've provided some direct evidence that immediate (off the tip) overspin does occur.

With regard to the scratch avoidance shot, it appears from the slow motion inserts that draw with outside english does the best. But I think the differences between straight draw and draw with outside english might be exaggerated. Measurements indicate that the OB was perhaps 0.1" closer to the cushion when using straight draw, and that it was driven more parallel to the cushion (ie, at a greater effective cut angle). I haven't tried to measure the cueball's speed and spin though, which are of course critical to all of this.

Thanks especially for the series of bank shots in B.25. It should be very useful for comparing model predictions at the steeper approach angles.

Good to see you back!

Jim

dr_dave
06-10-2008, 03:31 PM
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jal</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dr_dave</div><div class="ubbcode-body">FYI, I just posted another new collection of instructional videos....</div></div>
Dr. Dave, great stuff as always. Thanks to you and Mr. Ross.</div></div>Thank you, and you're welcome.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jal</div><div class="ubbcode-body">I think you've provided some direct evidence that immediate (off the tip) overspin does occur.</div></div>Agreed, and I like your "off the tip" parenthetical.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jal</div><div class="ubbcode-body">With regard to the scratch avoidance shot, it appears from the slow motion inserts that draw with outside english does the best. But I think the differences between straight draw and draw with outside english might be exaggerated. Measurements indicate that the OB was perhaps 0.1" closer to the cushion when using straight draw, and that it was driven more parallel to the cushion (ie, at a greater effective cut angle). I haven't tried to measure the cueball's speed and spin though, which are of course critical to all of this.</div></div>I'd be careful making any conclusions from NV B.25 (http://billiards.colostate.edu/normal_videos/new/NVB-25.htm) because I present only one example of each shot. The amount of speed, drag, draw, English, cut angle, throw, and pocket cheating all affect this shot. If I had 10 well-controlled and consistent examples for each shot, then conclusions might be appropriate. My instinct tells me straight draw is the most reliable approach with this shot.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jal</div><div class="ubbcode-body">Thanks especially for the series of bank shots in B.25. It should be very useful for comparing model predictions at the steeper approach angles.</div></div>I hope to do a much better job with this (with more cases and more angles) for a thorough analysis next month. Bob Jewett might be visiting to help with this.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jal</div><div class="ubbcode-body">Good to see you back!</div></div>I haven't really left. It just seems CCB traffic has been down lately.

Regards,
Dave

cushioncrawler
06-10-2008, 04:53 PM
Dr Dave -- I tend to think of "overspin" az what u get when u hit the qball very high and it initially heads off skidding with over-skid (for a very short time). Compared to hitting it lower and it heading off with some sort of under-skid. Or hitting it so that it heads off rolling, ie with zero-skid.

I havta allow for overspin when playing some shots in English Billiards. When the qball iz say 6" from the objektball, and i hit with extreme top, the qball deflexion angle iz narrower than what i get with my old familiar (rolling) deflexion angle.

The misscue iz interesting. I count the side of the shaft hitting the qball 3 times (due to vibration), not counting a possible 4th time (that iz due mostly to the player letting the cue fall). When i misscue i can sometimes find 3 marks on the qball. The first iz the chalky tip-mark, the second iz the (brass) ferrule, and the third iz the woody-gunk from the shaft.

But, when uzing a very shaped tip, i get 4 such marks on the qball -- but all of theze are chalky tip-marks, zero ferrule, and zero shaft.

I still karnt get over how little the modern qball followz-throo when (while) hitting the objektball, in fakt in the video it looks dead still (apart from the topspin). I reckon that it shood continue throo at a small speed, say 3% of pre-impakt speed, like qballz did in the oldendayz (i think), e woz about 0.85 (i think). The modern pool ball must hav an e of 0.99 or something -- but the highest figure that i can get from my tests on my krapamiths iz only about 0.93 (something fishy here). madMac.

dr_dave
06-11-2008, 09:19 AM
Re: HSV B.26 (http://billiards.colostate.edu/high_speed_videos/new/HSVB-26.htm)

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: cushioncrawler</div><div class="ubbcode-body">Dr Dave -- I tend to think of "overspin" az what u get when u hit the qball very high and it initially heads off skidding with over-skid (for a very short time). Compared to hitting it lower and it heading off with some sort of under-skid. Or hitting it so that it heads off rolling, ie with zero-skid.</div></div>That is how I am using the term also. With overspin, the CB has more topspin than with a roll shot, so it has "reverse drag" (with acceleration) briefly until full roll develops.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: cushioncrawler</div><div class="ubbcode-body">I still karnt get over how little the modern qball followz-throo when (while) hitting the objektball, in fakt in the video it looks dead still (apart from the topspin). I reckon that it shood continue throo at a small speed, say 3% of pre-impakt speed, like qballz did in the oldendayz (i think), e woz about 0.85 (i think). The modern pool ball must hav an e of 0.99 or something -- but the highest figure that i can get from my tests on my krapamiths iz only about 0.93 (something fishy here).</div></div>Excellent point! I have also measured CORs in the 0.91-0.93 range, so I agree that one would expect to see more CB push-through at impact. However, ball mass also comes into play. I just weighed both balls used in the video. The Elephant Practice ball with the black stripe (the CB) weighs in at 169 grams (5.96 oz) and the 10-ball (the OB) is 170 grams (6.00 oz). This might partially explain what you are seeing. Also, maybe the COR for this ball combo is slightly larger than our previous numbers suggest.

Regards,
Dave

Joeyjay
06-11-2008, 09:54 AM
I read all your stuff in the magazine, you do great work, we are lucky to have such a smart man helping us play better. Thanks.

dr_dave
06-11-2008, 03:15 PM
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Joeyjay</div><div class="ubbcode-body">I read all your stuff in the magazine, you do great work, we are lucky to have such a smart man helping us play better. Thanks. </div></div>Thank you for your kind words. I'm glad you like my articles.

Regards,
Dave

cushioncrawler
06-11-2008, 03:27 PM
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dr_dave</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: cushioncrawler</div><div class="ubbcode-body">I still karnt get over how little the modern qball followz-throo when (while) hitting the objektball, in fakt in the video it looks dead still (apart from the topspin). I reckon that it shood continue throo at a small speed, say 3% of pre-impakt speed, like qballz did in the oldendayz (i think), e woz about 0.85 (i think). The modern pool ball must hav an e of 0.99 or something -- but the highest figure that i can get from my tests on my krapamiths iz only about 0.93 (something fishy here).</div></div>Excellent point! I have also measured CORs in the 0.91-0.93 range, so I agree that one would expect to see more CB push-through at impact. However, ball mass also comes into play. I just weighed both balls used in the video. The Elephant Practice ball with the black stripe (the CB) weighs in at 169 grams (5.96 oz) and the 10-ball (the OB) is 170 grams (6.00 oz). This might partially explain what you are seeing. Also, maybe the COR for this ball combo is slightly larger than our previous numbers suggest.Regards, Dave</div></div>Yes -- Last night i realized that qballz tend to be light, from wear mainly. Then i thort that perhaps my pendulum tests were badly done -- but then i remembered that my anvil bounce tests gave identikal rezults -- and i had gone to great pains to faktor-in all sorts of correctionz for air drag, anvil mass, ball mass etc etc in both sets of tests. madMac.