that sketch clearly displays the most efficient Diffuser-to-rear-wheel-size Ratio
@LeeePowers4 жыл бұрын
Drawn to scale,of course.
@christmasisawesome934811 ай бұрын
My team is designing a diffuser. This is a great help. Thank you.
@kaktotak82678 жыл бұрын
Could you make a video on the blown diffuser please?
@danielrance40082 жыл бұрын
“Talked to and ex f1 person”. Little did we know he had cracked time travel and actually just talked to his future self
@cloudk20888 жыл бұрын
Thank you for your videos, I'm in aviation and I find motorsports aerodynamics fascinating especially Formula 1. Your channel was created for me haha!
@gregw67486 жыл бұрын
You haven't mentioned separation of the air flow so when the diffuser stalls, it doesn't entirely stall. This enables to have the diffuser with different angles of attack, so it can work effectively on different speeds.
@peter555peter17 ай бұрын
Spend hours planning his lesson. Didn't take 2 seconds to think how a fine tipped marker will show up on video. 😅 Great lesson though. Keep them coming.
@huntos837 жыл бұрын
Kyle - near the end of this video you mention the use of L shaped strakes in older diffuser designs to move the vortices closer to the ground.I understand how this would work, but my question is why is this an old design that is no longer used if it is better?
@Planktarded5 жыл бұрын
huntos83 he was saying in another video, modern f1 cars are built to meet class racing specifications, so I cannot pull up and race in the batmobile. It must built according to the rules.
@xavierrodriguez24633 жыл бұрын
dangerous probably
@sepg50843 жыл бұрын
@@Planktarded do the new rules specify that diffuser strakes cannot be L-shaped?
@chetansingh32192 жыл бұрын
It has sharp edges so prolly something to do with car laws not allowing them bc they are too dangerous
@jasonsand23552 жыл бұрын
Is there any specific examples of cars with these? I’ve been looking and can’t seem to find any
@paulshepherd58706 жыл бұрын
Brilliant, you explain in such a way that it becomes easier to understand. A great help with my studies.
@AndZzo1017 жыл бұрын
a beautiful example of the L- or S shapes of the strakes , is the F2004! thx for mind blowing !
@nickanderson83055 жыл бұрын
Super helpful. I'm currently designing a diffuser for my car and this has given me some info to help make a couple changes that should improve it
@countblah70995 жыл бұрын
Hello, I'll be doing the same soon also, what material do you plan on using?
@nickanderson83055 жыл бұрын
@@countblah7099 I actually 3d printed it for a one time use shell, then covered it in fiberglass
@kittyhawk5019 жыл бұрын
So happy I found your channel! Makes me more excited I decided to major in engineering!
@jameswright47328 жыл бұрын
Question for near the end of the video. You talk about vorticies created by the strakes helping to "block" the tire squirt from coming over. Also, in your diffuser video you talk about how the actual turning direction of the vortex has a lot to do with "blocking" side flow (this is specific to the part of the video where you discuss how canard's vortex actually rotates the wrong way to actually provide the sealing affect). With the rotation of the vorticies on the strake in the diffuser, aren't they rotating in the wrong direction for them to be blocking the tire squirt (or any incoming side flow)? Or does the vortex absorb the tire squirt and lessen it's affect that way?
@KYLEENGINEERS8 жыл бұрын
Well, for the canards case because the vortex is high, it's the rotation direction at the floor that we are concerned with. I.e. you want the vortex pushing the air out from the floor, not pulling it in. For the strake vortices, they are actually spanning the gap between the ground and the strake, so the vortex itself is entraining the flow into its centre. That way the core is acting almost like a physical wall, and the direction of the vortex is largely irrelevant. It would actually be preferable to have them spinning the other way, but there is no way I can think of doing this that doesn't adversely affect diffuser performance. Make sense?
@jameswright47328 жыл бұрын
Yep, that makes perfect sense. Thanks for the clarification!
@888berg9 жыл бұрын
Most enjoy your aero knowledge. I was watching an old tour de France doco, and in the 90's many teams had wheels entirely covered up in perhaps plastic covers - much like time trial riders (rear wheels especially). Any how - I'm interested to hear your insight - especially that 10 years later - wheels are certainly not covered. Whats the deal?
@KYLEENGINEERS9 жыл бұрын
888berg I'm not hugely up on bike aeros, but my understanding was that the full covers give less drag, however have significantly higher sensitivity to crosswind. I believe it was largely a rules change which removed them, although they also are heavier so for rides with hills etc the aero benefit is probably negated by the extra weight. The fact that time trial riders (who are generally less restricted by rules on their bike aeros) still run discs on the rears shows to me that they are still superior for drag.
@888berg9 жыл бұрын
KYLE.DRIVES Cheers for the reply - that makes sense :)
@93ariebombarie4 жыл бұрын
Awesome explanation! How does one block tyre squirt at the front wheels though?
@randomtoyotadude89522 жыл бұрын
How fast do u need drive for a splitter or/and defuser to have any value except from cool looks???
@DoggysStyle9 жыл бұрын
how does this explanation help in the case of the RedBull diffuser which cuts off half way
@lucywucyyy7 жыл бұрын
i expect its to only catch the end of the tire squirt coming into the diffuser
@Tarex_5 жыл бұрын
So with the high pressure area in front of the tire that comes from being squished by the wheel, mostly applying to slick tires, would it make sense to reduce that with a kind of arrow that would deflect the air left and right minimizing the full stream of air from hitting the tire head on? more referring to full body cars not open wheel < O===~~~
@jasaircraft4 жыл бұрын
Could you do a vid on what would be the general aero shapes a drag racing car should look for, from the mild to the wild depending of the vehicle's speed of course.
@EliteSniperTV7 жыл бұрын
Channel is called Kyle drives, yet I've seen him drive once lol
@peterb83879 жыл бұрын
Since the vortices rotate clockwise on the right side and counterclockwise on the left side looking from behind the car ahead, does that encourage an "inwash" ? Does the direction of spin matter for how good and air skirt the vortex is ? Would the opposite spin on both respective sides be better by encouraging and "outwash" ? What do you think Kyle ?
@KYLEENGINEERS9 жыл бұрын
Peter B The "inwash" is actually the thing the at is causing the vortices if you think about it that way. The strakes are essentially fighting the inwash from both the tyre jet and outside air being drawn into the diffuser, and the direction of the vortices is decided by the crossflow over them. To get opposite spin, the strakes would actually have to be oriented to draw the air inwards, which would be the opposite effect. Think of it as the strakes help stop the crossflow and section off problematic parts of the diffuser, and the vortices (which can entrain flow) act as further barriers near the ground that can stop undesirable flow features migrating across (such as tyre squirt).
@kanavmohanmarwaha2432 Жыл бұрын
Just a question sir, at the end of the video you were saying the use of L shape diffuser as it pushes the vortices much closer to ground, then shouldn't be a inverse T shaped diffuser even better than straight edge and L shape. If yes then why don't are they used in F1 and other motorsports?
@MyLonewolf258 жыл бұрын
Also On those l kicks Is it correct to presume that those vortices are on the leading edge as well?
@Brennan.P7 жыл бұрын
I love your drawings! keep up the good work
@hsieh8119 жыл бұрын
7:34 Sorry but what decides the vortexs' direction?
@365hillclimb9 жыл бұрын
hsieh811 I was just going to ask that. Do they always form clockwise?
@KYLEENGINEERS9 жыл бұрын
Jesse O'Brien Vortex direction is decided by the direction of flow across the geometry, think of it as flow spilling over the ends. As the diffuser/undertray is a region of low pressure compared to the atmosphere, it will naturally 'suck' the air towards the centre of the car. This creates a flow across the strakes, which will cause the vortices to rotate in the directions I have shown. Does that help?
@365hillclimb9 жыл бұрын
That makes perfect sense. Sometimes I'm surprised by how simple things are, while other times I'm surprised by how complex these concepts can be. This is one of the simpler times.
@gavinzheng14866 жыл бұрын
Hi, I saw there are small fins in rear bumper in most the car. Are those small fins useful or just for good look?
@GeeeEm614 жыл бұрын
I am no aero expert, but I know that the "diffusers" you see on most road cars are fake, and they're just decorative, ie, to give it a sporty look. Their diffusers are barely 5cm long. The best I've seen on a road car is the diffuser on a Renault Clio Mk IV RS. If you look at an under body shot on the net you'll see it extends from the rear axle to the back of the car. I don't know how effective it is, but it looks the most effective of all I've seen.
@petermuniz92963 жыл бұрын
What will happen if I put it underneath the bumper I don’t want to put on top of my roof
@lukeparsons5839 жыл бұрын
And just one more question, if you're able to answer this as well: Why do LMP1 cars have such a different style rear diffuser and different strakes than F1 cars and other sports cars?
@KYLEENGINEERS9 жыл бұрын
Luke Parsons Mainly when you see diffuser differences , it's due to rules. Don't trust most of what you see on an F1 car, as it's usually just a device to get around a very specific set of rules. In saying that F1 cars have far more rigorous aerodynamics analysis than many LMP cars, so you would expect more complicated flow devices around the diffuser area. Also, the influence of body shape etc should not be underestimated. As such you would expect a large difference between a time attack car, and LMP and an open wheel car.
@EdWard-uh5me9 жыл бұрын
I need some advice on a rear diffuser i have for my clubsport which is used for club sprints. how can I contact you and send some pics to you?
@KYLEENGINEERS9 жыл бұрын
+Ed Ward For consulting work, you can contact me at www.jkfaero.com or use the business contact email on my channel page. Cheers, Kyle
@colinterry72619 жыл бұрын
Hey Kyle, I saw ford doing some ducting on their new F-150 where they routed air coming at the front into the wheel wells. Can you explain if this is a benefit or detriment?
@KYLEENGINEERS9 жыл бұрын
Colin Terry I honestly can't see how that would be of benefit, unless it is for brake and shock cooling. Thinking about it, that is probably the reason as they are quite heavy so downforce isn't exactly going to matter, and the drag is so terrible on the thing already that that wouldn't matter, but a big truck could always do with cooler brakes and shocks...
@colinterry72619 жыл бұрын
Thanks, I guess I never considered that as a possibility. It does make sense now that I think about it. Thanks so much for the insight!
@jubuttib8 жыл бұрын
Looking into it, Ford has explained that the system (which they call "The Air Curtain") is supposed to create an airflow that goes in through the front and exits from the wheel well, with the intention that this helps keep outside air from diving into the wheel well and interacting with the wheel, reducing turbulence and drag. Essentially it tries to smooth out the airflow across the side of the car. They can't use the "optimal solution" (fully enclose wheels in skirts) due to practicality reasons, so they're trying to use this ducting as a way to get a similar effect.
@GoldenSim275 жыл бұрын
i personaly think its not about ''vortex'' but about air flow , if the exit is wider than the entrance , its gonna create suction/downforce at entrance of air , and also drag at the rear to help stabilise the car , and making it go twards the exterior may also help diminish the turbulances coming from the sides .. thats my opignion , i dont really understand the vortex thingy
@dandingerat5 жыл бұрын
he's not explaining what the function of a diffuser is, he's explaining the function of strakes ON the diffuser. I think you have it mixed up.
@jamiekwong57713 жыл бұрын
did you not see what the title of the video is?
@edwarnett289 жыл бұрын
so why are there multiple strakes across the entirety of the diffuser and not just one on either side to stop the flow from around the tyre?
@KYLEENGINEERS9 жыл бұрын
One fence along will be fairly ineffective in controlling tyre squirt, as the vortex is not being shared and the squirt cannot be trapped, so you need more than one. In saying that, I often see diffusers with waaaay too many strakes in them and that's largely from people who either don't properly understand their function or are doing it for looks. I am currently doing some consulting for a car that I am putting a strakeless diffuser on as the tyres are a long way from the diffuser so tyre squirt is not an issue. Thanks for watching!
@KYLEENGINEERS9 жыл бұрын
KYLE.DRIVES sorry *alone not along
@1320crusier9 жыл бұрын
KYLE.DRIVES This would explain the C7.R's strakeless diffuser. Though.. that makes me wonder why it looks more like a reversed splitter..
@texis3007 жыл бұрын
@kyle.drives What is the height from the ground that the diffuser/strakes/fins need to be at in order to provide best effect?
@dubtechbrotherstv57442 жыл бұрын
I love your videos so much ♥️
@svriderpokey8 жыл бұрын
Does undercar down force negatively affect drag, or fuel economy?
@MyLonewolf258 жыл бұрын
svriderpokey down force does not necessarily equal drag
@KB4QAA6 жыл бұрын
To both, yes it may, however fuel economy is seldom a factor in racing. The drag is a 'maybe" depending on the design, but may actually improve. In any case the entire purpose of the down force is to improve road grip, improving handling which then allows higher speed maneuvering through corners which then wins the race. Higher overall speed is more important that minor increases in drag or fuel consumption.
@chrisedwards38666 жыл бұрын
In the video kzbin.info/www/bejne/pom8e6OOgLKjlac he shows that a simple flat underbody can actually reduce drag, which should improve fuel economy. That does make sense intuitively, as a standard roadcar's inefficient underbody has many areas that interfere with the airflow. If the underbody has a more advanced design - so that it's not flat and is intended to add more downforce than a simple flat one would - I would expect that there is some tradeoff from an increase in drag compared to the flat. But as with all things aero, that depends greatly on how that interacts with other components. And if there is a way to get 4 pounds of downforce for 1 pound of drag (or whatever the accepted ratio is), then a team would certainly take that option.
@alphonseraynaud9764 жыл бұрын
it's funny how often the things we see are not the most important aerodynamic piece: I used to think that diffusers where the strakes but now I realise that the essential part is the slope
@SaddMCB Жыл бұрын
I have always seen them as tools to soften the laminar flow transition from smooth flowing to swirly behind the car. If you leave flow to go it's way after the flat belly/tunnel, it's going to swirl violently and pretty close to the bodywork. Strakes brake the laminar flow up into sections, creating smaller vortices than transition into high pressure area more easily. I am not making any claims. This was just my layman's thinking. Is there any merit to this theory?
@lukeparsons5839 жыл бұрын
Why do some diffusers have more strakes than others? Is there a certain "best" number to have?
@lukeparsons5839 жыл бұрын
Luke Parsons Also, is it better if the strakes are straight (as in go back and up at a 90 degree angle) or rounded? I'm sorry for asking so many questions. haha
@KYLEENGINEERS9 жыл бұрын
Luke Parsons Strake number will vary depending on tyre inflence, ride heigh, flow around the body etc. There is no "best" number to have. I recently designed a full custom undertray for a client where we were running 8 strakes and two horizontal deflectors to control the tyre squirt and ensure extremely high floor efficiency, however the centre 80% of the diffuser only had 2 strakes in it. Normally we try to aim the strakes away from the centre to counter flow ingress, and this results in somewhat of a rounded profile. Thanks for watching!
@MIMCKMedia5 жыл бұрын
Thank you. So now the question is where to position them at best
@g3user1usa8 жыл бұрын
It appears the Chaparral 2J eliminated all that random airflow. Jim Hall didn't mess around.
@Isegawa20018 жыл бұрын
Any fan car eliminates this airflow, especially the 2J, since it has that 'Box' format.
@thomaslamothe32637 жыл бұрын
Fantastic video!
@sausagemaan90972 жыл бұрын
the ex f1 person was yourself lmaooo i can't
@Yorie12342 жыл бұрын
Look at the upload date.
@Eric-ue5mm9 жыл бұрын
Great explanation!
@InYourDreams-Andia Жыл бұрын
So frkn cool. You rock. ✊
@III504III7 жыл бұрын
excellent video!
@dylanbourget93985 жыл бұрын
Love your videos! So does this mean that if rules permit ideally you should run the side skirts absolutely as low as possible?
@daytonm68095 жыл бұрын
Yes, some older f1 cars actually had sliding side skirts!
@TaylorPhase2 жыл бұрын
why dont high end EVs use strakes or fins then? tesla, porsche taycan, the new mercedez eqxx insane flat smooth long diffuser, and so on?
@Rueda8888 жыл бұрын
So, if you can block the airjet generated by the tyres with one or two strakes, why cars like the ford gt lm gte use up to 8 strakes? Yesterday, Willem Toet came to my university to explain tha nature of the diffusers and strakes, and clarified the use of them as vortex generators, to take the high energy air from the ground up to the boundary layer...your explanation makes sense though...so I'm a little bit confused right now hahaha For further information: www.linkedin.com/pulse/how-do-motorsport-ground-effect-diffusers-work-willem-toet By the way, really liked your videos about aerodynamics. Keep going! Cheers.
@MARKELKNIGHT8 жыл бұрын
Not relevant at all but you remind me of the chap out of Ted that tries to steal him (the teddy), great video!
@VesselFitterguy3 жыл бұрын
Wow just learning about air drag spoilers actual uses besides lookn bad ass.
@JuiceBlack9 жыл бұрын
Good stuff!
@clementezamudio16539 жыл бұрын
Fantastic!
@sabercruiser.70534 жыл бұрын
THANK YOU MAN.
@kavemanbites8 жыл бұрын
that makes sense.
@KuostA9 жыл бұрын
TLDR?
@KYLEENGINEERS9 жыл бұрын
Shame, you're missing out =P
@hu51163 ай бұрын
Good video, but please do invest in a new marker pen. It’s hard to follow “air pictures”. Thanks
@countblah70995 жыл бұрын
Paddy Lowe lol that's whom he spoke to lol (JOKING)
@paigeeubanks10019 жыл бұрын
As for their rings , they were so high that they were dreadful ; and their rings were full of eyes round about them four . 😀
@mohittandel54414 жыл бұрын
Tnx bro
@TomisaLami Жыл бұрын
Why do you spend so much time telling us what they don't do and what they aren't for? I don't even know what the point is you spent so much time explaining extra stuff I don't even know what the lesson to learn here is.
@hanynowsky3 ай бұрын
This video is ruined by useless explanations that do not make sense without clear and intelligible illustrations and drawings. It s just like you are talking to.yourself.
@DaveMcIroy7 жыл бұрын
Good video. Sad that the title question isn't answered.
@lucywucyyy7 жыл бұрын
yes it was
@DaveMcIroy7 жыл бұрын
antsolja Where?
@lucywucyyy7 жыл бұрын
maybe if you watch the video all the way through you will see yourself litterally the entire video is answering the question
@DaveMcIroy7 жыл бұрын
I watched the whole thing. What do you think why I say it? You will now say bla bla. So tell me a point in the video, where it's answered!
@lucywucyyy7 жыл бұрын
so you just cant be bothered to watch the whole video. just to shut your adhd ass up il give you the short version: the strakes are there to create small vortexes near the ground to stop air being bushed into the diffuser by the tires and ruining the airflow.