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Is a 'slow' swimming pool impeding world records?

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Re: Is a 'slow' swimming pool impeding world records?

#181

Earlier quoted context omitted.

Could probably increase fairness by doubling the width and throwing away the last few lanes (leaving them empty). But would that incentivize the edges? I don't know.

It's not supposed to be fair (as in equal) though, lane assignment goes inside-to-out based on qualifying times. The easiest way to avoid the chop is to get out in front and stay there.

Makes sense.

Re: Is a 'slow' swimming pool impeding world records?

#182

Earlier quoted context omitted.

Yes, those on the outside will have choppier waters as the water bounces off the sides of the pools. The modern competition pools do a pretty good job of reducing this effect, but it is always there.

Could probably increase fairness by doubling the width and throwing away the last few lanes (leaving them empty). But would that incentivize the edges? I don't know.

They do throw away one lane on each side already, FYI (in addition to positioning competitors to minimize influence on results, as others discussed)

Re: Is a 'slow' swimming pool impeding world records?

#183
post #5

I was a college swimmer, qualified for Olympic Trials in 2012 and 2016. There are absolutely slow and fast pools. It basically comes down to two things: 1. The depth - which is only 7ft in Paris, unusually shallow for a competition pool. 2. The sides. Does the water spill over the sides into the gutters, or smash into a wall and bounce back, creating more chop. A trained eye can see all the swimmers in Paris struggli…

My untrained eye has noticed. But I also think it's not really a big deal. There are so few events where the conditions are exactly the same every 4 years. Just kinda the luck of the draw if you happen to be competing in the most ideal conditions for WR setting in any event

> But I also think it's not really a big deal.

the difference of the resulting turbulence from the wave bounced back from the bottom surface at 2m here and from the more traditional 3m is a big deal. The water is pushed by the swimmer's hands with the speed of something on the scale of 2 meters per second, so, as the swimmer moves forward, that turbulent movement of the water reflected by the pool bottom may as well come behind the legs in the 3m depth case while in the 2m depth case it would catch the legs decreasing the efficiency of their movement.

Re: Is a 'slow' swimming pool impeding world records?

#185

Earlier quoted context omitted.

Also, the important bit is fairness for all competitors. As the OP said, the same conditions affect everybody. I have little sympathy for the (few) swimmers complaining. They are not owed a world record and if they’re that good, they’re going to get one anyway.

Wouldn't the sides affect swimmers on the edge lanes next to them more? And is this one reason why the strongest swimmers are usually placed in the center lanes?

From the races I saw they specifically had the edge lanes (left most, right most) empty probably for this reason. I.e. 8 out of 10 lanes are used. I think one of them did have someone in one of those lanes because one of the qualifying heats was a dead heat.

Re: Is a 'slow' swimming pool impeding world records?

#186
post #96

So it's more shallow, which is a problem. Like if you trained for track on pavement vs rubber vs sand, you're going to have different results, even if "everyone has the same environment" not everyone's body will have the same relative response. I don't like that assumption that just because it's the same for everyone means the difference will affect everyone the same. Are France competition pools across the country j…

Plenty of pro sports have variation in conditions. World Cup soccer is played outdoors with rain, heat, whatever. Rain matters even more in Le Mans, where time records are being set. It doesn't really matter as long as it's cool to watch.

Re: Is a 'slow' swimming pool impeding world records?

#187
post #5

I was a college swimmer, qualified for Olympic Trials in 2012 and 2016. There are absolutely slow and fast pools. It basically comes down to two things: 1. The depth - which is only 7ft in Paris, unusually shallow for a competition pool. 2. The sides. Does the water spill over the sides into the gutters, or smash into a wall and bounce back, creating more chop. A trained eye can see all the swimmers in Paris struggli…

My untrained eye has noticed. But I also think it's not really a big deal. There are so few events where the conditions are exactly the same every 4 years. Just kinda the luck of the draw if you happen to be competing in the most ideal conditions for WR setting in any event

Additionally, anybody good enough to be prevented from setting a world record because of this pool will undoubtedly have multiple chances in other competitions with faster pools.

Re: Is a 'slow' swimming pool impeding world records?

#189

World records don’t matter in the Olympics. Medals go to those who show up and prevail.

World records matter on their own, as long as the measurement is trustworthy. The way we know this matters at the Olympics, is that world records are being tracked and discussed at the Olympics.

But you're right, they don't affect medals.

Re: Is a 'slow' swimming pool impeding world records?

#190
Slow pools absolutely exist, as wave drag is the major impediment to speed and contributes about 55% of total drag. A shallower pool has more reflected wave energy in all directions. 2m is very shallow for a competition pool.

This paper does a decent job of modelling how swimmers move through water: https://royalsocietypublishing.org/doi/epdf/10.1098/rsif.201...

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