Speed holes?

"PartyPooper2012" (PartyPooper2012) 09/08/2020 at 14:04 • Filed to: None

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I was browsing the interwebs and a stupid video popped up - 6 facts about random shit you didn’t know.

So I watched it. And for the millionth time, they showed why golf ball has dimples.

So I watched yet another video on it...

So, tell me oppo. If I put dimples all over a car, will it be faster? I think it might. But I don’t know if I want to commit my car to this experiment.

Need a running and driving beater to test theory.

PartyPooper2012 > PartyPooper2012 09/08/2020 at 14:09

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EDIT: OK OK. I FOUND IT

https://www.myscorecard.com/blog/?p=1278#:~:text=The%20theory%20or%20the%20improvement,same%20speed%20using%20less%20fuel.&text=So%2C%20in%20a%20difficult%20economy,well%20save%20you%20some%20cash.

onlytwowheels > PartyPooper2012 09/08/2020 at 14:11

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Corbin Sparrow has dimples.

PartyPooper2012 > onlytwowheels 09/08/2020 at 14:13

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fascinating...

If we said tomorrow all cars get dimples to save fuel, least efficient space on car becomes glass. Remove glass for dimpled surface and replace with camera/screen... OY. What I hole i dug

VincentMalamute-Kim > PartyPooper2012 09/08/2020 at 14:15

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Improved mileage by l eaving your car outside in a hailstorm!

WRXforScience > PartyPooper2012 09/08/2020 at 14:20

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Mythbusters did this and it worked. You can do better than uniform circles though and make parabolic indentations since cars always go forwards (well, at any significant speed).

onlytwowheels > PartyPooper2012 09/08/2020 at 14:20

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Corbin, with even more dimples .......

https://www.rideapart.com/articles/246764/the-return-flight-of-the-sparrow/

PartyPooper2012 > WRXforScience 09/08/2020 at 14:28

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I am simplifying it a bit, but I am guessing that the dimple creates a vortex of air that acts like a wheel. Wheel allows air to ride over it reducing air friction.

Maybe some trucks should get dimples... maybe amazon delivery trucks need dimples. I sell dimples. 10 for a dollar. 20 dimples for 3 dollars

PartyPooper2012 > onlytwowheels 09/08/2020 at 14:29

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why use a weird car? Why not beige camry like everyone else drives? 

415s30 W123TSXWaggoIIIIIIo ( •_•))°) > PartyPooper2012 09/08/2020 at 14:34

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The Aptera did the most for aero efficiency, doing this gets you some serious range, they were going to make a four door at some point too, according to an interview I read.

PartyPooper2012 > 415s30 W123TSXWaggoIIIIIIo ( •_•))°) 09/08/2020 at 14:49

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I am guessing in this day and age, Tesla would benefit the most from this. 

415s30 W123TSXWaggoIIIIIIo ( •_•))°) > PartyPooper2012 09/08/2020 at 14:51

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I was actually surprised they didn’t pick it up and make a small four door. The highway range on this thing could be pretty impressive now, things have progressed since then.  

TheRealBicycleBuck > PartyPooper2012 09/08/2020 at 14:57

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“... creates a vortex of air that acts like a wheel.”

“ Maybe some trucks should get dimples...”

I believe t his is why most pickup trucks get better mileage with the tailgate up.

PartyPooper2012 > 415s30 W123TSXWaggoIIIIIIo ( •_•))°) 09/08/2020 at 14:57

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One thing I did notice tho... those cars mythbusters and other experimented with - the dimples are pretty far apart. Unlike golf balls. Those have dimples right next to each other. I wonder if there is a big portion being overlooked. 

PartyPooper2012 > TheRealBicycleBuck 09/08/2020 at 15:04

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I was thinking bigger - 18 wheelers etc. 

415s30 W123TSXWaggoIIIIIIo ( •_•))°) > PartyPooper2012 09/08/2020 at 15:05

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They have done the dimples on the flat floors of race cars, I’m not sure if it’s worth it. I haven’t seen it lately. 

PartyPooper2012 > 415s30 W123TSXWaggoIIIIIIo ( •_•))°) 09/08/2020 at 15:14

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I am guessing dimples are worth more on curved surface so attacking air rides on air wheels.

On straight surface, there isn’t much resistance

BaconSandwich is tasty. > 415s30 W123TSXWaggoIIIIIIo ( •_•))°) 09/08/2020 at 15:33

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I wish they wouldn’t have gone under. :(

WRXforScience > PartyPooper2012 09/08/2020 at 16:08

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That’s not too far off, it’s all about getting the air to change from laminar flow to turbulent flow which helps to separate the air from the object and keep the air from “sticking” to the ball.

There are lots of aerodynamic tricks  that can work, and you don’t necessarily get the biggest benefit from dimples. Fluid dynamics is mostly a dark art full of secret techniques and befuddling conclusions.

BoxerFanatic, troublesome iconoclast. > PartyPooper2012 09/08/2020 at 16:13

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Vortex generators to reduce trailing drag, and modify or detach laminar flow.

A sphere that can present any aspect forward is a bit different than a vehicle that pretty much always presents a specific forward aspect.

Streamlining and a few strategic laminar flow spoilers... maybe a couple of tricks like a KAMM tail, or flowing air around or through the bodywork from a high-pressure area to a low pressure area, like a diffuser.

T he ultimate speed holes... like Ford GT and Lotus Evija... through the bodywork like swiss cheese.

PartyPooper2012 > WRXforScience 09/08/2020 at 16:30

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I want some... can I get my c5 wrapped in dimples and see how much faster I can go?

Who makes custom wraps? And I don’t mean make my car look rusty type wraps. 

onlytwowheels > PartyPooper2012 09/08/2020 at 19:02

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Camry bumper dimples???

PartyPooper2012 > onlytwowheels 09/09/2020 at 06:07

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Lower it a tad... and it’s grounded to the ground! Sports Car!