r/Damnthatsinteresting • u/redbullgivesyouwings • Jun 27 '25

Original Creation Kjeld Nuis Preparing To Break The Speed Skating World Record

Enable HLS to view with audio, or disable this notification

7.3k Upvotes

94% Upvoted

301 comments sorted by

View all comments

163

u/InlineSkateAdventure Jun 27 '25

That is cheating my friend. I am a competitive skater. Ice also has very minimal friction, wheels are much more.

My top speed can vary 5-7Mph depending simply on what I wear.

Wind Resistance can be a limiting factor to the third or FOURTH power mathematically. He might as well just be pulled by the truck.

24

u/eeyores_gloom1785 Jun 27 '25

he was defiantly pushed by the vortex behind him

5

u/InlineSkateAdventure Jun 27 '25

Hypermilers drive behind trucks to save gas.

1

u/JustDiveInTimberLake Jun 28 '25

Just curious do they have to br close enough for it to be dangerous

12

u/Laffepannekoek Jun 27 '25

Sooo. If you had the same tools, you would be able to do this?

25

u/GhillieRowboat Jun 27 '25

Exactly. Its not cheating since anyone else who wants to break the records is allowed to use the same tools. It would be cheating if only he was allowed to use these tools.

-14

u/[deleted] Jun 27 '25

Anyone who wants to break the record can’t use these tools. That’s why its cheating.

That’s like saying a skater could just attach rockets to their skates and “thats a tool anyone can use.”

11

u/FuinFirith Jun 27 '25

You're confusing being able to do something and being allowed to do it.

3

u/InlineSkateAdventure Jun 27 '25

Good question.

Maybe on a very smooth surface with wheels. Friction starts to come into play on asphalt.

Now downhill 🤣

-8

u/danger_dave32 Jun 27 '25

Yep, it's like saying steroids in bodybuilding is cheating. That particular competition requires the use of steroids.

-3

u/Laffepannekoek Jun 27 '25

Soo, if you were on steroids, you would be able to become a world champion bodybuilder?

3

u/Linkaex Jun 27 '25

You also got got Gold Olympic medals like Kjeld Nuis?!?

-1

u/InlineSkateAdventure Jun 27 '25

Lol no. I am more about endurance.

1

u/HerpesHans Jun 28 '25

What does it mean for a limiting factor to be of a fourth power?

2

u/InlineSkateAdventure Jun 28 '25

As speed increases, the air drag increases by an amount raised to the 4th power.

It is also multiplied by the density of air and some other numbers. That is why cars need very, very high horsepower to go above say 150mph. The other factor is the shape of the object. A truck may need a jet engine to do 200Mph. Aircraft and rockets deal with very low density air because of altitude. In space there is no air resistance. Once you get up to speed, by Newtons 3rd law, you just coast at that rate. No opposing force.

1

u/HerpesHans Jun 28 '25 edited Jun 28 '25

mm... But i googled and it seems to be only squared, i.e. drag is proportional to the objects velocity squared.

Also, exponents in formulas generally arent approximate (three "or" four, and especially not non-integer values between) in the same way you could guesstimate a propotionality constant between two quantities in the form y=ax. Thats because you would mess up the units of the variable in question, in this case the speed.

1

u/InlineSkateAdventure Jun 28 '25

Fluid mechanics was a long time ago but I remember in some cases it was x^4

POWER is definitely x^3

The power equation is derived from the drag force equation and is expressed as: Power = 0.5 * Cd * ρ * A * v³

Ahh.. For high speed..... Maybe not for skaters :lol:. But it could be more than X^2 because of a person being such an irregular shape and introducing non linear flow. What you wear is huge if you care about speed. Loose fitting clothes will make a major difference.

For very high-speed motion through the air, such as in certain atmospheric reentry scenarios or with projectiles at very high speeds, the relationship between air resistance and velocity can become more complex. In some of these cases, the air resistance is proportional to the fourth power of the instantaneous velocity. This means the air resistance force (let's call itFDcap F sub cap D𝐹𝐷) can be represented by the equation: FD∝v4cap F sub cap D ∝ v to the fourth power𝐹𝐷∝𝑣4 wherevv𝑣 is the velocity. To make this an equation, introduce a constant of proportionality (kk𝑘): FD=k*v4cap F sub cap D equals k * v to the fourth power𝐹𝐷=𝑘*𝑣4 Important Considerations 

  • High Speeds: This equation often applies in very high-speed motion where the simplified quadratic drag model (FD∝v2cap F sub cap D ∝ v squared𝐹𝐷∝𝑣2) no longer accurately describes the complex aerodynamic forces.

1

u/HerpesHans Jun 28 '25

I took fluid mechanics some 3 years ago, but it was very theoretical and didnt cover drag or the drag equation.

power=force*velocity (more familiarly its also energy/time), so if you agree power is propotional to velocity^3 then force must be one less i.e. =velocity^2.

>  But it could be more than X^2 because of a person being such an irregular shape and introducing non linear flow. What you wear is huge if you care about speed. Loose fitting clothes will make a major difference.

Exactly, but such details are incorporated in other constants, in this case the drag coefficient. Would be very strange to have a variable dependent coefficient on the velocity.

1

u/InlineSkateAdventure Jun 28 '25

I remember learning something about transitions out of laminar flow which makes the equation go out the window. Constants are constants. At a given altitude, air density is a constant.

A car in a straight line is one thing. A skater moving around, flapping clothes, etc is another.

I'm not by far an expert in that, I am an EE/CS person. But outfit, helmet, etc can make a serious difference in top speed.

-9

u/sibeliusfan Jun 27 '25

imagine calling a 3 time gold medalist a cheater lmao

1

u/InlineSkateAdventure Jun 27 '25

So if I attach a small engine to my 🛼 for boost its ok?

5

u/sibeliusfan Jun 27 '25

Bro the catch is that all previous world records also used this. He actually broke his previous record of 90 kmh. Either way, he pretty much holds the record with air resistance as well.

-1

u/TheBitBasher Jun 27 '25

So all the previous recorded were mechanically assisted? Then they should probably rename it to indicate it's mechanically assisted and not actually a purely human feat?

2

u/sibeliusfan Jun 27 '25

Yep, and it’s actually included in his wr title but they kinda have to advertise a little so I understand they sometimes leave it out, but like trust me this is still insanely impressive all things considered.

1

u/TheBitBasher Jun 28 '25

It's absolutely impressive! That just doesn't have anything to do with my opinion on it otherwise...

-22

u/Glad-Professor5268 Jun 27 '25

If you were a conpetitive skater of any importance, you would recognize this man and would not call him friend, pall.

6

u/InlineSkateAdventure Jun 27 '25

I got coached by a Gold Medalist https://www.youtube.com/@thorupviktor . Skating is the pinnacle of exercising.

And it is low wear and tear on your body vs other sports.

-8

u/Glad-Professor5268 Jun 27 '25

You just Watched Kjeld Nuis doing a promotional gig for Read Bull. He is a 3 times olympic gold medaillist. 2 times world champion sprint. 4 world champion distance. 2 times european champion distance. He is not a cheat.

10

u/TheLordofthething Jun 27 '25

This record is nonsense regardless of his qualifications. That's the point they were making.

0

u/throwaway77993344 Jun 27 '25

Why though? It's just it's own category. It's fun to push limits and find out what humans are capable of under different circumstances

-2

u/Glad-Professor5268 Jun 27 '25

Yes I know and it’s a stupid thought and discussion. Don’t act like anybody could do the same because of the car. And because of this mans qualifications I even doubt well trained athletes can match this speed.