kudos to whoever's in charge of sound! it's gotta be a pain in the butt to record sound in an active windtunnel

@robertpalin5878

Жыл бұрын

Audi's tunnel is also aeroacoustic, so you can do measurements of noise generated by wind around the car. I've tested cars in there myself, and it's pretty much silent, even with the wind doing 140kph - until you put some big bluff thing in there to disturb the wind!

@H4n583

Жыл бұрын

Came here to write exactly that. Well done 🙏👌

@johnbb99

Жыл бұрын

@@robertpalin5878 It's the way that a microphone capsule itself responds to the wind that is the problem. I'd guess that the reason it's quiet in there is that the tunnel itself is carefully made to be aerodynamic, to be efficient.

Great tag team by the presenters, Imogen and Jack. Another fun and informative episode.

Great episode, cannot believe this stuff is freely available on youtube. Amazing.

@ayebrow

Жыл бұрын

That’s because there are many many people who choose to pay for it through Patreon, so Robert Llewellyn has been able to grow from a one-man band 11 years ago to a whole team of professional people working on the channel, and it will hopefully reach 1m subscribers this year or early next. I’ve been watching since the beginning, but only signed up as a patron this year. I even sit through the shorter ads to make sure the channel gains a bit more revenue (the 3 min spammy ones I usually skip, although sometimes just let them play through while I read the comments) The debut video and early videos are always worth a re-watch, because Robert is a fantastic presenter and knows his stuff.

0:40 JACK: “What IS drag?” RuPAUL: “Sit down, child, this might take some time to explain…” 😂 💄 👗 👠

@shhhyouknowhoo3753

Жыл бұрын

😂😂😂 very good 👏👏👏

@marklonguet-higgins6041

Жыл бұрын

Drag Force = Fᴅ = ½𝜌𝜐² 𝙲ᴅ𝙰 (in Newtons ISO, kg⋅m/s²) 𝜌 = Density of the air (1.204 kg/m³ at 20℃) 𝜐² = Speed squared (in ms⁻¹) 𝙲ᴅ = Drag coefficient (Audi GT = 0.24) 𝙰 = Frontal Area (in m²)

Looking at Jack standing next to another human (other than Robert) and especially next to an old sedan, you realise just how massive he is. A tower of a man. Really puts his back seat legroom comparisons into perspective. Thanks guys. 😊

@903lew

Жыл бұрын

I love that he’s properly sized. If he fits I fit.

@johnsmith-cw3wo

Жыл бұрын

She is shorter than average, that make Jack even bigger.

@PassportToPimlico

Жыл бұрын

Although when he's sitting in the back seats, he's driving.

Imogen just occasionally using terminology that gives away her background as an actual aerodynamics engineer 🙂 making her the perfect choice to present this!

Great to see that you continue to emphasize the importance of aerodynamics - and great to see that it is finally coming back. I hate that something as shallow as fashion could be seen as more important than the laws of physics. Also - that classic Audi 100 was always a big favorite of mine - I was 10 years old when it was released - and the aerodynamics of it was always the key reason for me liking it. More stuff like this please!

@ahaveland

Жыл бұрын

Well said about shallow fashion - physics is far more beautiful.

@rp9674

Жыл бұрын

True, they're not called suggestions of physics

@Finnv893

Жыл бұрын

It has never left.

@niklaswejedal463

Жыл бұрын

@@Finnv893 - then why do we see all these brick-shaped SUVs everywhere?

@John.0z

Жыл бұрын

@@niklaswejedal463 SUVs also have a big "A" in the drag equation. So they are a doubly bad choice for those who do not absolutely *have* to have one.

Imogen's awesome - I appreciate how she explains and summarizes these concepts.

@timsmith5339

Жыл бұрын

She is clearly a great presenter but the way she was throwing the correct terminology around suggest she has a background in this area too.

@tamagine

Жыл бұрын

Yeah she's awesome and so smart! I think she studied engineering at Oxford.

A very informative video, thank you especially to Imogen for such a clear explanation of a very complex process. More please.

0:56 Hummer EV: hold my beer.

This is one of the best videos you guys have done recently. Super entertaining and all really informative!!

Fantastic episode. The sort of science-education content that we used to get from the BBC shows like Tomorrow's World. Keep it up!

The 10 year old me fell in love with slippery aero design when the 1983 Audi 100 was introduced, not only by the cool futurist looks, but also the plain rationality of it - make the car aerodynamic and save fuel - what´s not to like? Therefore, I have been quite upset over the last 25 years as big boxy energy gulping SUV:s suddenly was the norm and aero efficiency was forgotten about. Good to finally see good old aerodynamics getting a well earned comeback! Great episode!

JACK AND IMOGEN TOGETHER?? 🤯

Interesting stuff. I'm guessing since vehicle speed plays such a large part you don't really have to focus on aerodynamics so much for a delivery truck with it's neighborhood speeds and stop and go driving. Those vehicles probably benefit more from regenerative breaking, lighter construction materials, maybe solar on their relatively large roofs.

@poplaurentiu4148

Жыл бұрын

Well yeah GM EV1 was build back in 1996-1999 and also had low drag coefficient of cd=0,186.. VW XL1 (2013-2016) had a cd =0,191.. The thing is Tesla also proved with the Tesla Semi that are a lot of areas that can be aerodynamically improved to get a more efficient range on the 18 wheeler, like cover for all wheels, slicker shape of the head-cabin, different wings under the trailer to channel & flow of the air etc..

Such a great video - many thanks to all involved!

The Fully Charged videos are always well put together and presented. This one no exception and gives excellent coverage of a topic too often ignored. Thank you Imogen and Jack for making it easy to understand.

Great video guys, really informative! Please keep them coming :)

Brilliant video, nicely presented and really interesting to see where the future is heading. Cracking car as well, look forward to collecting mine soon once production delays are sorted.

Absolutely loved it, particularly Jack and Imogen presenting as a team. Their joint, “this is Fully Charged” intro was perfect 😀

A really great episode. Please, more informational videos like this. Thank you.

A well done exposition of a technical subject. Fun too.

Very enjoyable and informative team ( just wanted to see them stand back to back 😁) . Interesting to see just how crucial the aerodynamics are in vehicle design now, just imagine how much gasoline could have been saved over the years if it was always applied🤔

@ecoworrier

Жыл бұрын

Exactly my thoughts

The Aptera getting 10 miles per kilowatt hour is a perfect example of how critical aerodynamics can be. (Most EVs get 5 or less, with upper 3's being the average)

@muffty1337

Жыл бұрын

You can count this Audi in the "or less category" ^^

@Sam-gf1eb

Жыл бұрын

It's a perfect example of how critical all things related to efficiency is. The Aptera is more aerodynamic, lightweight and has in wheel motors. It was designed from scratch with the idea of efficiency, not focusing on how cool it looked or making sure it had 4 or 5 seats.

@flannel2699

Жыл бұрын

..and a clear reminder that, relatively speaking and despite progress, aerodynamic efficiency at Audi (and almost everywhere) is still an afterthought.

@kenmcclow8963

Жыл бұрын

I am really interested in the second car Aptera does which will have 4-5 seats and 4 wheels, and probably still be more efficient than the others. Rumor says they may be able to add a third seat in the smallest battery configuration of the initial car which help break it out of the niche of two seaters.

@MDP1702

Жыл бұрын

@@flannel2699 More like one important factor, next to everything else (looks, comfort, performance). Aptera can get away with their so high focus on aero efficiency because they are essentially aiming for that pretty niche market of people who are fully focused on range and low fuel costs. If Audi or other established car manufacturers would switch to aptera like designs, they'd see their sale rate plummet quite quickly. They really need to thread the needle and find the right balance between all those factors.

I worked as an undergrad in a wind tunnel at the NPL at Teddington. Enjoyed it so much. The smoke only comes out when the client’s on site. It’s pretty much just because it looks cool. It serves no qualitative purpose.

@deus_ex_machina_

Жыл бұрын

But then how _do_ they visualise the flow to analyse the results? Lasers?

@armadillito

Жыл бұрын

@@deus_ex_machina_ primarily you measure the force exerted on the test object I think. Flow visualisation is useful when you want to know WHY something has an effect though.

Excellent reporting, thank you

Lucid Air: 0.20 Mercedes EQS: 0.20 Tesla Model S: 0.208 NIO ET7: 0.208 Porsche Taycan: 0.22 So, Audi's still got work to do.

@eskanderx1027

Жыл бұрын

You should check on Aptera...

@deus_ex_machina_

Жыл бұрын

But the e-Tron GT has better design than the cars you mentioned, IMO.

@evolv.e

Жыл бұрын

Aptera: 0.13 🏆

@Cloxxki

Жыл бұрын

@@eskanderx1027 Aptera is not something an Audi SUV customer will cross-shop, though. They care a bit more about staying out of hospital than being THAT greenwashey.

@craigspender1710

Жыл бұрын

@@Cloxxki Composite monocoques are incredibly strong and since Aptera are yet to do physical crash-tests (simulations only to this point) your "staying out of hospital" comment is pure supposition. Let's wait until we have some facts on which we can base opinions, before making uninformed judgements.

Imogen did a fantastic job interviewing!

Packed with great information leading into the upcoming generations of vehicles.

Glad to see the photo of a 1960 Ford Thunderbird. The 1958-60 T-birds were nicknamed “squarebirds.”

Quality geek TV - Great combo with two presenters who have a genuine passion for the subject. I feel like there's been another move forward of late, keep it going 👍

You guys do such a good job. This was a very fun and informative video. Thank you.

I've been a convert to the benefits of reduced drag when I built my MkIII Midas Gold. Initially I drove the completed car without the under-trays fitted. When passing juggernauts there was a definite twitch felt twitch felt at the steering wheel. Access to a friend's pit allowed me to fit the under-trays. The difference was immediately noticeable, no twitch when overtaking juggernauts and the car felt much smoother. You had to watch out as it was too easy to exceed the speed limit without realising it. Thank you, Gordon Murray for you input to the design! All this was in 1986.

Another great episode guys! Imogen explains the concepts so well.

Fantastic episode. Really interesting. Loved it.

It should be noted that CFD requires multiple dimensions of approximation to work at all. So the volume around the car is divided into millions of tiny cubes in the model, and likewise the airflow, and most critically the differential equations governing the conservation of momentum are made up of an infinite series of terms, so a perfect solution for any step is impossible to achieve, even if you could somehow start with 100% accurate initial conditions. So the models work only with a “close enough” approach, and have dramatically improved as computers can handle smaller cubes, finer time steps, and more terms in the equations, but can never resolve everything. Which is why engineers always end by building physical models and testing them in “real” conditions. All the same applies to weather and climate forecasting, btw - computers are incredible, but they cannot work miracles.

@simondehaas8784

Жыл бұрын

CFD has a lot of limitations; witness the huge expense on simulations in Formula 1 design that still result in huge variation in car design and performance each time the rules are changed a bit. They rely hugely on testing and opex to refine things

@andymccabe6712

Жыл бұрын

Surely, it critically comes down to a battle between maximising aerodynamics and DESIGN! You don't want your Audi to look-and be, completely preposterous - and, crucially, you want it to look like an AUDI!!!

@ayebrow

Жыл бұрын

@Simon de Haas - absolutely, but my point was that those limitations can only be mitigated a little with more advanced computing, because of the nature of the non-linear equations within the model. And I didn’t even go into the issues with establishing the initial conditions in terms of pressure, air density, humidity, temperature and direction. Many people have a naive belief that we can just keep throwing computing resource at a problem and we can get “more accurate” results, but whilst we can improve the models we will never remove the need for physical models and real world testing. Formula 1 presents orders of magnitude more difficulty to aero designers than ordinary road vehicles of course, with speeds, accelerations, decelerations and interactions with other cars all presenting huge challenges. And I won’t say anything about the fact that some teams stretch the definition of what is allowed within the regulations 😀

Thank you, very informative.

@ 4:40, A single cheek slide certainly minimises any friction. Even less if you clench. Look at the distance that Imogen pulled on Jack. She can really hold a slide! This was an extremely interesting topic. Very informative. I'd like a Sono Sion, but can't go past the aerodynamic efficiency of the Aptera!

Imogen & Jack make an incredible team for presenting this sort of scientific knowledge & artistic awesomeness, great episode 😄🙏🏼 Aerodynamics is cooler than I previously imagined 💚

Great content - keep it coming

Nice informative vid. Car looks pretty nice

Just a killer video, well done.

I used to run an environmental test chamber for Esso at Abingdon, so I really enjoyed this video.

Excellent insight into an aspect of car manufacturing that we rarely get to see.

Just a pity the etron is so electrically inefficient, and has very poor range for the battery size.

@NeilBlanchard

Жыл бұрын

Yes - the drivetrain efficiency is THE most important factor - and then comes aerodynamic drag.

@Sam-gf1eb

Жыл бұрын

Take a look at the Hummer EV

@FreekHoekstra

Жыл бұрын

@@NeilBlanchard actually thats inverted, the aerodynamic drag is by far the biggest drain on the battery. The drivetrain efficiency is over 90% in most electric cars already.

@NeilBlanchard

Жыл бұрын

@@FreekHoekstra I am talking about the overall efficiency - if you compare EVs with ICEs, the largest improvement comes from the drivetrain, and once that is "solved", then the next biggest gain comes from aero drag. And as was commented on, if the EV drivetrain is NOT at peak efficiency, then even the best aero drag can't salvage the efficiency.

@YounesLayachi

Жыл бұрын

"electrically" 🤣

Wonderfully informative. Fab video.

Excellent episode, very informative and great to see these facilities in action! Also, the team-up between Imogen and Jack works really well 🙂 Small gripe though: OK to use "handwritten" text in the graphics, but is it necessary to keep them wiggling all the time?

@incognitotorpedo42

Жыл бұрын

Wiggles are all the rage these days...

@fullychargedshow

Жыл бұрын

We have a very nervous animator

So if Audi is so good with Aero, why is the Audi e-tron GT only rated at 82 mpge compared to 132 mpge for the Tesla model 3?

@slimbarry6438

Жыл бұрын

Spot on. Looks like Fully Charged were on a corporate jolly.

@patreekotime4578

Жыл бұрын

Maybe because Cd is only a one in a dozen different factors that ultimately contribute to range? Frontal area is a huge factor and he eluded to the fact that the design team wont make adjustments for the sake of aero. So corporate branding concerns outweigh efficifiency for some marques.

@andymccabe6712

Жыл бұрын

Maybe Audi don't want their cars to look like Tezzlers.......!! ......and who can blame them!!

@Vlican

Жыл бұрын

The real reason is no one else bothered to give them an interview and tour, only Audi did

@johnbriggs7514

Жыл бұрын

@@andymccabe6712 From the side, the Audi e-tron GT and Tesla Model 3 look remarkably similar.

Those big 4x4 travelling at speed on the outside lane make excellent aerodynamic wedges to follow. I regularly achieve 5.1MKwH behind them. Coaches are also good. A lot depends on how you drive. As a pilot I know all about drag and how to exploit the effects of air resistance. The difference between 65mph and 70 is noticeable. It’s about finding the sweet spot.

Best explanatory video! Nice

Worth pointing out (given all the comments below about efficiency of the Audis) that the Teslas are particularly good in their AWD versions because of their "hybrid" motor setup. They use permanent-magnet motors on the rear wheels to do most of the work, where the running efficiency of the permanent-magnet motor outweighs its relatively high running drag (when coasting, you can't prevent inducing some waste current in the coils since the magnet is always "on"). In front, they use induction motors, which are not as efficient, but have quite low running drag, since you can turn off the current that induces a magnetic field in the rotor. Then you use the permanent magnet motor in the rear to do most of the drive and regen braking (catering to its strengths) and turn on the induction motor in the front when you need AWD traction or brief acceleration (again suiting the motor to the task). Very clever, and resulting in a car like the Model Y which is AWD, but still gets hwy eMPG of 117...compared to the e-tron quattro which gets (gulp) 77 eMPG on the highway (and in the real world, highway eMPG is what most affects range for the vast majority of drivers). Design matters!

2:02 source of the graphic should be indicated. It was taking from Wikipedia, but there is a source for that to mention.

@GregHassler

Жыл бұрын

The image is licensed as public domain, free to use for any purpose without attribution.

@dercncplaner

Жыл бұрын

@@GregHassler This content is owned by the Author "TheOtherJesse". If you read: "Content in the public domain may not have a strict legal requirement of attribution (depending on the jurisdiction of content reuse), but attribution is recommended to give correct provenance." This means it depends on the Author to ask for provenance or not. No, public domain is not automatically as you said. But here the Author said clearly: "I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law." So, it should be fine. Always look for the source guys.

Really great lesson in car design from 2 excellent presenters. If only I could afford that Audi...

Great episode. Please don’t forget the Hyundai Ioniq. A very slippery car. Drag Coefficient .24 Not the greatest looking car but very efficient.

Back in the late 80s, I worked at a Subaru dealer for a while. The XT was the closest thing they had to a sports car. I can't remember what the coefficient of drag was, but I remember they were quite proud of it at the time.

Great work guys - Really interesting piece. I wonder how the same challenge looks for the world of vans, that are a way behind in the aerodynamics department... I think the Brick was most appropriate!

@bikeaddictbp

Жыл бұрын

Details matter. For example, Fiat Ducato (sold as Ram Promaster in North America) Cd = 0.31, which is rather surprising for a vehicle of such a shape. Obviously someone paid attention when designing that one. The problem, of course, is the frontal area. A great big box that someone can stand up inside, there's only so much that can be done.

I suggest you produce a short with Jack (and potentially Imogen, if she was in the same position) addressing his perspective as he was operating the smoke gun and visualizing aerodynamics concepts, how it impacted his perspective. What's missing is the consideration of the conflict between shaping the vehicle to optimize the aero and optimizing the footprint, the inner volume. The noise treatment for the wing is brilliant, whether through the mic covers or post-prod.

Nice one peeps, and Jack if Imogen wants to go for a beer, you say yes ma'am!!

Glad to see a focus on efficiency on this channel, Its the fastest way to get more range for less cost and is more interesting and useful than how fast a car gets from 0 to 60. I want to know how fast Ev's can get from 500km of range to a 1000km for under 30 grand, now that is a metric worth knowing about.

@Monaleenian

19 күн бұрын

They probably get there by having gigantic batteries. Big, heavy EVs like that are not a good idea in my opinion. They’re much heavier than their ICE counterparts that have similar or greater range, which is worse for the road infrastructure and worse for pedestrians and other road users in the case of accidents. A small, light EV with a small battery that provides modest range along with a larger ICE car for longer journeys would be a better combination for most families.

Great episode, Jack and Imogen make a great team. More of this please. Comparing your gait on sprinting back up the slope, Imogen clearly has a much lower Cd (not to mention CofG) than Jack. 😊

@johnsmith-cw3wo

Жыл бұрын

also Imogen's leggings have great drag coefficient. 😀😀

@TWOKDOK1

Жыл бұрын

@@johnsmith-cw3wo I doubt that they’d fit Jack ?

What I want to know is to quantify what a reduction in drag does to the range, so what’s the difference in range between a car with a drag coefficient of 0.3 and 0.24

Ok, I'll be the weirdo: Slippery when designed well... And I loved the design.

Question regarding your drag coefficient data. What is the A (area) used in the formula to calculate the drag coefficient? After all, we ar interessed in the lowest force being created when comparing cars :)

@bikeaddictbp

Жыл бұрын

"A" = frontal area measured in square metres. If the front were rectangular when viewed from directly ahead (disregard the visual-perspective aspect of it), it's the width x height. With an irregular shape (which is more commonly the case), you have to do the math but it amounts to the same.

@ChrisBigBad

Жыл бұрын

Cd gets multiplied with A. Which is why I always find it funny, when people congratulate HUGE cars with record-breaking Cd-values, when a small, less aerodynamic car will run circles around the big one, just because the frontal area of the whole box is half of the big car. Squeezing the last 0.01 Cd out of a car is nice and all, but buying a car which is 20cm slimmer will fix that manyfold.

As a student of computational science master program , I find it fascinating

BRILLIANT!

It still amazes me to see the wheels looking like big fans and most all vehicles don't cover the rear wheels all the way to the lower rim. Maybe they are saving some improvements for the next model? We know they can do better than 0.20.

7:25 I guess the rain was always teaching us what the most aerodynamic shape was

I am a Tesla guy, but boy is that e-tron GT good looking! 😍

the answer to why you need a wind tunnel is to ensure that the computer flow simulation is accurate. Most flow simulation software uses particle emission simulation and a series of complex predictive algorithms to try to determine how the forces will load on a surface, and thus help to determine what the coefficient of friction and, thus, drag should be for a vehicle. But, because the sample size is somewhat low due to processing constraints and the algorithms can't perfectly represent reality, it is still necessary to build a model and chuck it in a wind tunnel to validate their predictions from the 3D computer model. So, it isn't that we can't simulate it, because we can. It's just good to acknowledge that our simulations still aren't quite up to the high bar that is reality.

I've been driving for a number of years, and my four favourite owned cars from yesteryear were a Citroen GS, an Audi 100, and my absolute favourites, my two Saab 900s. One an Injection, one a Turbo 16. All the cars had aerodynamics high on their list of priorities. All through those times I had been waiting for battery technology to catch up to the electric motor. These days, it's a VW ID.3. Maybe the next one is a Tesla. I love not having that unnecessary front grille that causes drag.

@andymccabe6712

Жыл бұрын

Such a pity that cars look so utterly ridiculous without a grill! Kinda like Lord Voldemort........!!! If you stare at the 'nose' of a Tezzler for any length of time it gradually morphs into something really quite scary.......

@ramblerandy2397

Жыл бұрын

@@andymccabe6712 But they look even worse when they have one but don't need one. And I've never heard any adverse comments of Porsches and VWs with rear engines and no grilles. You get used to these things.

Great video !! Hope SUV's owners see it ! What's the use of electrifying 2 to 3 tons-heavy bricks ? ( do you hear me BMW/ Hummer/ GM etc etc ...of course you don't ahaha !) ??? Also hope the trend will change and people understand that our cars will need to look as much as possible like the APTERA or the Mercedes EQXX ;). Thanks for your videos !!! Bonne journée !

I had an Audi 100 avant, even the car jack was aluminium. I had the 1.8 carb model and could get 42mpg fully loaded for camping

Really good video

18:07 Logitech mouse from the early 2000s, I love how Audi are using bleeding-edge tech. ;)

I remember a Dinky toy model of a land speed record car called the speed of the wind. If you look at many of the current designs they still show the same principles.

@herrunsinn774

Жыл бұрын

Wow... I hadn't thought about Dinky Toys since I was a kid. I used to love them. I think I still have a few in a box in the basement. They were made of metal with real rubber tires, so that last just about forever. Thanks for the memory! ☺

great info

Thanks team, we need more videos like this. The etron is not an efficient vehicle and has poor range.Mass and electric efficiency carry as much "weight" as CD. 2 examples; Aptera /mass 800 kg CD 0.13 700-1600km range (solar) Ford F150 Lightning/mass 3tons CD 0.56 range up to 500km /towing 200-250km (estimates). PS; this episode reminds me of Beyond 2000 and Tomorrows World.

Excellent presentation Jack & Imogen. I didn’t realise Jack was such a heavy smoker. I sincerely hope that aerodynamics (and other disciplines) continue to improve the efficiency of our vehicles, and that cheap fuel never again compromises car design.

Thanks Audi for showing us. Thanks FC for making the movie. Please reduce the squigglyness of the crayon font.

It's funny considering the Audi e-tron GT is objectively bad in efficiency (202Wh/km) compared to a lot of electric cars. Hyundai, Tesla, Renault, Peugeot, Cupra, MG... All achieved 160-170Wh/km on similar sized cars. It goes to show how much the industries values this kind of testing, it's really one of the keys to making great electric cars.

Very entertaining and informative. Jack and Imogen are a great presenting team

@richardnedbalek1968

Жыл бұрын

Yes! More of them together, please. Imogen plays the straight, and Jack goofs off a little now and then. Classic!

Equations! Thanks!

Jack has a very interesting way of saying 'slippery', and he seems to like using the word too!

I remember speaking to someone in the late 80's who had been involved in some sort of auto racing. This man had absolutely no concept of drag or the drag coefficient formula. He adamantly believed that the only thing limiting a car's top speed was the gear box and the amount of straight track available. I was appalled.

It's great to see someone as informed as Imogen do the presenting...you can tell from the way she seamlessly talks about nice laminar flow and separation she knows her stuff. So ironic that the company willing to host was Audi, whose EVs are utterly at the bottom of the pack when it comes to efficiency (eMPG). Perhaps they were hoping to use this forum to distract from that fact?

Flat bottomed cars, you make the rocking world go round

I t's about time that aerodynamics has risen to the forefront. It is also interesting, that it's AUDI that you chose to show the development of cd. Thanks

@MrAdopado

Жыл бұрын

Do you mean because Audi make some of the most inefficient EVs? Or do you suspect that Audi are using this for some free advertising?

Good explanation and graphics!

The same tricks work for ice cars just as well for more mpg.

QUESTION: Is gloss paint any slipperier aerodynamically than matte paint?

@thewheelieguy

Жыл бұрын

Speaking as an engineer, the difference in surface roughness is probably much less than 5 microns or .0002 inches. At the scale of air moving along a 5m/16ft car at 120kph/75mph any drag difference is not really measurable.

@O-cDxA

Жыл бұрын

According to A2 wind tunnel, it does not. You would have to be travelling over 200 mph ( or perhaps it was 300 ) for it to have any effect. Also, it is better to have a long pointy tail than a pointed front end, because the front will have attached flow, whereas the rear does not, and so you want to wake as small as possible.

Great looking car

Citroen we’re obsessed with aero since the 1950s. Cars like the GS had, for the time, excellent figures as low as 0.30 CD…

Music at 2:54? :)

The sweetspot is a EV w/ 25-40kwh battery that gets 150-200 mile range but only costs $15-20K USD. No autonomous driving, no amazing 0-60 times just simple & reliable & efficient. Basically a model 3 without the tesla brand & gadgets

Like your phone. The most important part is battery degradation. Nio does battery swapping stations so you constantly have a new full battery within minutes

I got to say “well, we are in Germany, it would be rude not to” for almost 17 years on and off, living in Hannover, Bergen, Bielefeld and Gütersloh. If certain obstacles were removed I would do my best to go back.

It's amazing how aerodynamic features like wheel covers, undertrays, flush door handles and camera mirrors aren't more common on ICE cars. They would benefit*more* in terms of energy costs and emissions reductions in absolute terms than EVs do.

@ayebrow

Жыл бұрын

Possibly true, but the auto industry has grown fat on historically very low fuel prices, and people have got used to driving hulking great bricks around without giving a feck about it. That has changed only recently, but any car maker investing in new ICEVs is going to waste a lot of money, when their sales are dropping exponentially.

There's no way the cost of designing that spoiler actually benefit the driver

"sedan" < hatchback < "wagon" so this is a win-win :)

12:06 0.24 right around (15-year-old) gen2 Prius cD.