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M: USA Curling Junior National Championships
Eau Claire, WI
Teams | Scores | Standings | Playoffs
Draw: M5 -- Wed, Mar 27 -- 7:00pm CT
Fitzgerald Final
Guentzel (10) Watch Live Curling!
Cenzalli Final
Rose (10) Watch Live Curling!
Church Final
Lannoye (10) Watch Live Curling!
Hebert Final
Brenden (9) Watch Live Curling!
W: USA Curling Junior National Championships
Eau Claire, WI
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Draw: W5 -- Thu, Mar 28 -- 8:00am CT
Giroux 4th
Schapman  Watch Live Curling!
Johnson 7th
Scheel  Watch Live Curling!
Berg 6th
Viau  Watch Live Curling!
Pekowitz 6th
Berg  Watch Live Curling!
M: Canadian Mixed Doubles Curling Championship
Fredericton, NB
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Draw: CF -- Fri, Mar 22 -- 1:00pm AT
Lott/Lott Final
Walk/Muyr (8) Watch Live Curling!
M: Swiss Junior Championships
Thun, SUI
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Draw: CF2 -- Sun, Mar 24 -- 3:00am ET
Caccivio Final
Brauchli 12  (EE)
Dryburgh Final
Ringgenberg (9)
W: Swiss Junior Championships
Thun, SUI
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Draw: CF2 -- Sun, Mar 24 -- 9:00am CET
Schwaller Final
Oberson (9)
Blackham Final
von Arx (9)
W: NWTCA Curling Club Championships
Fort Smith, NT
Teams | Scores | Standings | Playoffs
Draw: 3 -- Sat, Mar 23 -- 11:00am MT
Stroeder Final
Delorey (7)
M: NWTCA Curling Club Championships
Fort Smith, NT
Teams | Scores | Standings | Playoffs
Draw: 3 -- Sat, Mar 23 -- 1:00pm ET
Delorey Final
Lockhart (EE)
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02-28-19 11:39AM
Tony Hladun is offline Click Here to See the Profile for Tony Hladun Find more posts by Tony Hladun Add Tony Hladun to your buddy list Edit/Delete Message Reply w/Quote
Tony Hladun
Harvey Hacksmasher

 

Registered: Feb 2019
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Sweeping Suggestion

Why do we sweep rocks? The sweeping friction creates a kind of water layer that reduces friction and makes the rock slide farther. (https://phys.org/news/2018-05-slipperiness-ice.html) Then if you think about a rock curling it would suggest that sweeping a rock on one or the other side of it’s path should affect it’s curl. So sweeping on the side (rock contact ring) that is rotating forward should cause the rock to curl more and sweeping on the side that is rotating back should make the rock run straighter.

I had a friend throw several draws and I swept using the two alternatives I describe. Obviously with the large number of variables it’s hard to be definitive on a small sample, but it did seem to work. On a draw it appeared that the two methods made a difference of about one rock diameter when it stopped at the T line, but this is the difference of being open or buried.

I’d also ask you to watch for this on TV curling. Directional sweeping is the norm now but watch how the sweepers over-reach and sweep on the wrong side of the rock path. Their belief is that it’s the sweeping direction that matters while I say it’s the side you’re sweeping that matters. I’m watching for this so many misses look like bad sweeping to me, but you watch and decide for yourself.

Hope this helps your game.

Last edited by Tony Hladun on 02-28-19 at 01:51PM

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03-01-19 05:57PM
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dks
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Good observation. I believe that corner sweeping (trying to sweep one side of the running path) is not mechanically doable. It is not possible to be within the 2 inch path you would have to be to drastically affect the path of the rock. Yes you can sweep one side, but, your brush would have to be so precise that it would be next to impossible to either stop less than 1/2 of the running surface or you would be too far from the surface to affect the rock.

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03-02-19 03:45PM
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Tony Hladun
Harvey Hacksmasher

 

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quote:
Originally posted by dks
Good observation. I believe that corner sweeping (trying to sweep one side of the running path) is not mechanically doable. It is not possible to be within the 2 inch path you would have to be to drastically affect the path of the rock. Yes you can sweep one side, but, your brush would have to be so precise that it would be next to impossible to either stop less than 1/2 of the running surface or you would be too far from the surface to affect the rock.


I agree with you that it's not easy to do, but if you watch the pro's they do often sweep on one side or the other and sometimes on the wrong side.

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03-03-19 05:46AM
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On The Nose
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Corner sweeping is impossible due to the simple fact that a curling stone, being a round, or circular, object, has no corners!

A corner is defined as: "a place or angle where two or more sides or edges meet".

Similarly, 'corner guards' are mis-named, as a round House can have no corners.

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03-06-19 10:33AM
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Tony Hladun
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On the nose...what is that? Like a punch on the nose? No, everyone in curling knows what a corner guard is and what on the nose means. DKS made very clear what he was saying about "corner sweeping". Just watch the Brier.

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03-07-19 01:49AM
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On The Nose
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quote:
Originally posted by Tony Hladun
On the nose...what is that? Like a punch on the nose? No, everyone in curling knows what a corner guard is and what on the nose means. DKS made very clear what he was saying about "corner sweeping". Just watch the Brier.

Umm... yes, I'm quite familiar with curling terms, thanks (sigh...).

But what I wrote is also a fact of life - a circular object has no corners.

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"It is easy in the world to live after the world's opinion; it is easy in solitude to live after our own... but the great man is he who, in the midst of the crowd, keeps with perfect sweetness the independence of solitude." ~ Ralph Waldo Emerson

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03-20-19 01:02PM
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RockDoc
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The physical fallacy of differential frictional forces on the left or right side of the running band causing left or right motion of the rock was dismissed around 90 years ago, and repeatedly disproved since then. To cause a leftward or rightward motion of the rock physics requires a frictional component at the front or rear of the stone. Even those who disagree on the physical mechanisms of curl recognize this. This principle has, of course, implications on sweeping technique.

It is generally accepted through empirical and theoretical evidence that directional sweeping is influenced by the deposition of microscratches in the ice surface. These microscratches, if made nearly vertical, exert the necessary left-right forces to influence the "curl" of the rock by interacting most strongly at the front and rear of the running band. The empirically most effective sweeping angle was found to be about 5 degrees from vertical.

Instrumented brooms, BTW, show that sweeping does not heat the ice enough to liquefy it, but does raise the surface temperature by 2C or so, which is sufficient to dramatically change its frictional properties.

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03-20-19 02:57PM
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Tony Hladun
Harvey Hacksmasher

 

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For the benefit of those following this thread here's what I said on my other post....

Watch Carey's two shots in the 7th end against Scotland. The first was swept on the wrong side and resulted in a rub and the second was swept on the wrong side and resulted in the missed run back. Forget the theory for a moment and just look at what's happening.

Watch from 1:31:30 of this video https://www.youtube.com/watch?v=eIaVGErCw9k

Last edited by Tony Hladun on 03-20-19 at 03:04PM

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Curling Scores

M: USA Curling Junior National Championships
Eau Claire, WI
Teams | Scores | Standings | Playoffs
Draw: M5 -- Wed, Mar 27 -- 7:00pm CT
Fitzgerald Final
Guentzel (10) Watch Live Curling!
Cenzalli Final
Rose (10) Watch Live Curling!
Church Final
Lannoye (10) Watch Live Curling!
Hebert Final
Brenden (9) Watch Live Curling!
W: USA Curling Junior National Championships
Eau Claire, WI
Teams | Scores | Standings | Playoffs
Draw: W5 -- Thu, Mar 28 -- 8:00am CT
Giroux 4th
Schapman  Watch Live Curling!
Johnson 7th
Scheel  Watch Live Curling!
Berg 6th
Viau  Watch Live Curling!
Pekowitz 6th
Berg  Watch Live Curling!
M: Canadian Mixed Doubles Curling Championship
Fredericton, NB
Teams | Scores | Standings | Playoffs
Draw: CF -- Fri, Mar 22 -- 1:00pm AT
Lott/Lott Final
Walk/Muyr (8) Watch Live Curling!
M: Swiss Junior Championships
Thun, SUI
Teams | Scores | Standings | Playoffs
Draw: CF2 -- Sun, Mar 24 -- 3:00am ET
Caccivio Final
Brauchli 12  (EE)
Dryburgh Final
Ringgenberg (9)
W: Swiss Junior Championships
Thun, SUI
Teams | Scores | Standings | Playoffs
Draw: CF2 -- Sun, Mar 24 -- 9:00am CET
Schwaller Final
Oberson (9)
Blackham Final
von Arx (9)
W: NWTCA Curling Club Championships
Fort Smith, NT
Teams | Scores | Standings | Playoffs
Draw: 3 -- Sat, Mar 23 -- 11:00am MT
Stroeder Final
Delorey (7)
M: NWTCA Curling Club Championships
Fort Smith, NT
Teams | Scores | Standings | Playoffs
Draw: 3 -- Sat, Mar 23 -- 1:00pm ET
Delorey Final
Lockhart (EE)
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