Science of Golf: Why Golf Balls Have Dimples
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- čas přidán 10. 09. 2024
- NBC Learn, in partnership with the United States Golf Association, explores the Science of Golf. Here, Steve Quintavella, USGA equipment standards operations manager, illustrates why golf balls have dimples and what they do for distance. Visit www.NBCLearn.com for more.
For daily updates from the United States Golf Association, visit us at www.usga.org, on Twitter ( / usga; / usopengolf ) and on Facebook ( / usga; / usopen .
Nice, now I am gonna use this information in my Fluid Dynamics final
mine is for a physics project lol
Haha same lol
You an me both haha
Mmh.. maybe not a good idea.
According with this (more clear and convincing) professor, the deflection is due to the Magnus effect, wich is a particular case of the third Newton's Law of Dynamics. And some videos overtly say that Bernoulli has nothing to do with that.
czcams.com/video/23f1jvGUWJs/video.html
Same professor on the role of seams on balls:
czcams.com/video/t-3jnOIJg4k/video.html
I tried to look up why rival darts have dimples but that didn't work.
Awesome. But this still doesn't explain why my ball always ends up in the woods...
Haha probably because you’re bad. Sounds like my mate William 😂
@@Tom-om9bg Why do you have to step on his silly joke by commenting my guy? Let him have his funny comment. He was obviously just making a joke and you stepped all over it like bit killer jones.
@@iwatchyoutube6539 jeez was only a cheeky joke calm down, no need to get mad me and doug sholly are mates
@@Tom-om9bg You still stepped on his joke lol. He already made a joke saying he was bad and you basically made the same joke in the reply lol
Rotational inertia?
Just a correction at 2:00, low pressure does not “suck” the ball, its the high pressure area around the side of the ball thats “pushing backwards” the ball because its trying to go with the low pressure because of the pressure difference
That’s so interesting. All this physics stuff is so new to me (as I never took a class on any of this). I find it fascinating. I know I asked this elsewhere, but why don’t they make the surfaces of planes and rocket ships dimpled? Would this help them go faster? What if they did this to cars? Would it make them more fuel efficient?
@@Phony-baloney8 Dimples work on a golf ball because it could be spinning in any orientation so you can just cover the whole thing. In the case of planes and rockets and cars there are more efficient ways to achieve the same effect. Google "vortex generator" to get an idea.
The best summary for why we don't just dimple everything though would be, you have to consider all the possible trade offs, cost, weight, complexity, manufacturing time, on and on and on. For a golf ball it works super well and isn't hard to do. For a car or plane or rocket it's easier to find other ways to reduce drag than trying to dimple the whole thing.
I think the mythbusters did an episode with a dimple car though, you can find that on CZcams.
Makes sense. A friend of my father's had an airplane that went through a hail storm. He swore the airplane flew 3 - 4 kts faster after the hail storm.
I often wonder what it would like to fly an airplane with dimpled surface or at least with some areas being dimpled and others smooth.
@@pinklady7184 Dimples cause higher friction. With a golf ball, the decrease in wake drag makes up for it ... but in the case of a plane they are already aerodynamic, so the percentage you decrease wake drag is much lower and probably wouldn't compensate enough for the increase in friction (If it did I'd assume people would be doing it already).
@@pinklady7184 A similar concept is actually already used. "Vortex generator" is the key word. But @8bitpineapple is also correct. These are not typically used on airliners. If I remember correctly then the vortex generators improve low-speed flight characteristics while in cruise it would add slightly more drag - at higher velocities the skin friction drag dominates, rather than the pressure drag (which the dimples intend to reduce). By the way, I'd imagine that in theory a teardrop shaped (or something cross-sectionally similar to an airfoil) golf ball would fly the furthest...of course hitting and having it maintain the attitude would be difficult.
Can we all just stop and appreciate how smooth that bunker shot at the end was...
Some years ago, Boeing used a redundant early 737 to 'golfball dimple' the fuselage. They did not touch wing tail or other lift surfaces. Just by 'dimpling' the fuselage, Boeing noted 3 per cent less drag resulting in a big fuel saving. [ps. This was never implemented on operational aircraft due long parking near maritime and other industrial toxics and related issues.]
I was jusr going to say why doesnt are cars or airplanes have this surface.
Would this same principle apply to a smaller ball, for example one that is .6840" (17.37mm) with dimples relative to its size moving at 300 to 400fps? Or does it even matter at this size whether it has dimples or not? Thank you for any advice you can share!
will this help me keeping the ball on the fairway? and reducing my 20yd slice:)
Very interesting video. Thanks
I don't know anything about golf but my physics prof said we're gonna get questions about this in our test so thanks guys:)
Mmh..
According with this (more clear and convincing) professor, the deflection is due to the Magnus effect, wich is a particular case of the third Newton's Law of Dynamics. And some videos overtly say that Bernoulli has nothing to do with that.
czcams.com/video/23f1jvGUWJs/video.html
Same professor on the role of seams on balls:
czcams.com/video/t-3jnOIJg4k/video.html
Why car body doesn't have these dimples than?
It works, mythbusters did a car with dimples.
MountainTech that’s sick, what episode?
Imagine dimples on bodies of airplanes and space rockets.
Tomasz Sz I know that the Corbin Sparrow - a 3 wheeled microcar - actually did.
Cosmetics
This is good golf information. Like taking a science class in school
Would dimples help the flow of air in a motors exhaust system?
most of the exhaust is flowing through the middle of the tube not touching the sides. you may see the exhaust on the sides move faster, but that would be an undetectable change in performance.
There are sections of the tubing that are not straight, i.e. bends and mufflers, so it is not all attached flow
If the air moves faster at the sides, even if only a small width, the volume of air moving faster would be great due to the radius squared factor, so it’s possible it may be detectable. In Motorsport, races are won by seconds from seemingly undetectable advantages 🤷
hardest intro in history 😭😭😭😭
This helped me to learn my test question "Why do golf balls have dimples"? thanks I learnt while watching
if you increase your overal leanth of serfice to 60ft by 14ft what would the size of dimple and spaced apart at 15mph what would be like
lol "put my pink panther ball in there"
Might sound weird but I only watched this video trying to do research into combustion chamber efficiency on an engine.
if spin
If this is so , then it makes one think and wonder why all the wings in modern aircraft as the Boeing 777 and the 707 and the Airbus 380 are not all covered with dimples?
Fluid dynamics are so very complex indeed. I would say that it all has to do with two type of vortexes. Those type of vortexes that are long and stretched and their axis is parallel with the motion of the item in question and occur on wing tips and and intentional vortex generators, they seem to move back with respect to the flying object in question and grow in size till they break down. And there are the others, whose axis is at right angle with the velocity of the item , they are short stubby no bigger than the flying item itself and rotate in some location on the flying object and they seem to be carried and move with the flying object at the back and sometimes at the front end, where they rotate in some localised corner till due to turbulence they oscillate and are replaced by similar vortexes.
In a golf ball there are so many different conditions to consider. Behind a smooth golf ball, the latter ones could be like those ring vortexes which are circles and curl on themselves and with which dolphin and whales like to create and play about with. turbulence and irregularities do disturb such beautiful ring vortexes.
1.There is a situation where the ball just travels and does not spin in any direction. The dimples on the circumference behind the front compression zone create long stretched elongated vortexes of ever growing radius, rotating helix which due to viscous and momentum force, will pump in air to fill the space behind the ball, presumably increasing the pressure behind the golf ball and lowering the drag.
2. There is a situation where the ball spins in some direction where the axis of the spin could be existing in a flat plane at right angle to the motion of the ball. In this case the ball will be subjected to a force known as Magnus effect which will cause the ball to swing in one preferred direction and this is a situation where footballers shooting a ball use it to score a goal from the corner point. In case of a golf ball swinging and curving in the upper direction, this would cause the golf ball to fly for a longer time , hence to improve range. Please note that I prefer to call the lifting due to a rotating ball as it travels forward , the Magnus effect rather than the Bernoulli effect.
3, There is a situation where the the axis of the spin could be parallel with the direction of flight of the ball, but due to the nature of the club hitting the ball, this latter state never really occur in a golf ball. In guns however, when bullets and missiles are shot, it is desirable to spin them around the axis parallel to the flight as this cause it to behave like a gyro and will not cause the bullet to tumble over itself as it makes its way to the target. In a golf ball due to the fact that it is a sphere, the latter is not of concern.
i stopped reading when you said "vortexes".... see the red line under that word bro. VORTICES
TLDR
The cross section of a wing is tear drop shaped not spherical... There is little to no vacuumm affect on the taillong esge of a wing so the golf ball efgect does not apply... If golf balls were tear drop shaped. They would not need dimples, but they would be hard to hit
Carmel Pule' do you study or work in engineering? If so, what softwares do you use at work?
@@mordyfisher4269 True, copying my another answer: "A similar concept is actually already used. "Vortex generator" is the key word. But these are not typically used on airliners. If I remember correctly then the vortex generators improve low-speed flight characteristics while in cruise it would add slightly more drag - at higher velocities the skin friction drag dominates, rather than the pressure drag (which the dimples intend to reduce). "
What would happen if they put dimples on planes and rocket ships? Would this make them go faster? I’m new to all this physics stuff . . . So if anyone know, feel free to share! Thanks!
Turbulent boundary layers vs laminar boundary layers. Turbulent boundary layers can sustain adverse pressure gradient better than it’s counterparts. Turbulent or vortex generated by this rough surface transport kinetic energy for the edge of boundary layers to a low momentum flow at the surface. This will greatly reduce flow separation or reverse flow that will cause drag. Of course you need energy to bend the fluid to create vortex thus creating drag but the result of total drag reduction generated via vortex generator far outweight it’s disadvantages.
USGA doesn’t regulate dimples?
Looking to learn more on behalf of NP Power Golf.
Titleist are the best 👍🏻
Best explanation..
i remember having a baseball-sized foam-ball with dimples. it really fell to the ground fast, without spin. with back-spin, it floated forward.
the dimples catch air, and let the ball ride.
a golfer puts back-spin on the ball. in summary, i find the current understanding of dimples on a golf ball to be seriously flawed...
Dimples are created to make the flow turbulent because turbulence have high energy and delays floe seperation.
Correct me if iam wrong.
why not mini dimples inside the big dimples ?
No matter how hard I try wind physics and air flow never make sense like how air even cause lift it’s magic
Why not add more dimples then? All of my golf balls have the same number of dimples I’ve checked.
What if the golf ball isn't rotating, still these dimples would work?
I don't think the dimples are 1,500th of a millimeter.
he said 15 100th of a millimeter. so 0,15mm
Number 1000 in the likes. Satisfying
According with the professor in the video linked below, the deflection is due to the Magnus effect, wich is a particular case of the third Newton's Law of Dynamics, not to the Bernoulli Principle. And some videos overtly say that Bernoulli has nothing to do with that.
czcams.com/video/23f1jvGUWJs/video.html
Same professor on the role of seams on balls:
czcams.com/video/t-3jnOIJg4k/video.html
make a suit with golf ball texture
I wonder if that can be done to a cannonball just for fun 🤔 lol
Dimples work but not for the stated reason. The spinning dimples feed air into the low-pressure zone behind the traveling ball. This puts a flow into the low-pressure zone allowing it to flow away in a stable cone shape, streamlining the ball.
sassyblondel "Feed air into the low pressure zone". Is that your way of saying the dimples delays boundary layer separation due to better transport of bulk momentum in turbulent boundary layers compared to laminar? Because I don't believe spin has to do with this effect.
yep. only thing spin affects is lift. backspin=more lift upward (magnus effect/kutta-joukowski). topspin=downward lift (same physics just opposite direction). looks like sassyblondel went to purdue or something for aerospace engineering LOL
@@rightyourwrong Magnus (in cooperation with Newton), NOT "Bernouli". Thank you.
@@rsteeb Exactly! Bernouli's principle is for inviscid flow, which would be an ok approximation for motion through air but only a low velocity....the golf ball travels at high velocity and there is significant viscous effects (aka Newton's Law of viscosity), so one can't apply Bernouli's principle.
I usually take pictures of golf balls I buy as it's probably the last time I'm going to see it...
This still does not explain it in depth, its cool surface level stuff(no pun intended), but seeing more of the actuall physics and math would've been cool
would that work on a plane too?
it works on cars, it was tested on mythbusters and the dimpled car saved 14% more fuel than the undimpled car when going the same distance
So, what do you do all day?
I put golf balls in a machine and press a button.
Anything else?
What else is there to do? I put golf balls in a machine and press a button.
2:10 , 2:54
These nerds make it happen.
Why can't we have this tech in bullets and disc golf
So that's why rival darts have dimples.
So why aren't airplanes dimple?
p b Airplane aren’t spinning object like a golf ball or tyres and also its not a sphere ball instead airplane utilise a tear drop aero style design and this pretty much reduce or eliminate the aerodynamic hole and reduce the chance of flow separation which induce the low pressure region at back end of the system.
p b A lot of aircraft wings do utilize vortex generators to accomplish essentially the same thing.
Really I don't need mindless muzac on my videos. Its annoying
Golf... what a joke.
Marek Sumguy worst sport ever
But here you are watching vids about it.P.S Its always people who can't play the Game don't like it,Wasters.
Marek_Sumgay
As a golf player, the real challenge is to keep your cool when your shot was really bad. I don’t know how this reply contributed to your comment but yeah.
@@fredschwarz3334 Marek Sumguy is one of those people that downvotes puppy videos. He is just an ass because he can be.
Gay!🤯