How do Gurney Flaps Work?
HTML-код
- Опубликовано: 8 июл 2015
- Today, we look at gurney flaps, a simple yet effective aerodynamic device for wings. The gurney flap is a small spoiler like device, typically 2% of the length of the wing chord in height, that improves the aerodynamics characteristics (downforce/lift and drag) of a wing.
Check out the original video from Grays Garage if you have time!
• auto aerodynamics : th... 
Авто/Мото
I would love an explanation of laminar flow airfoils vs traditional airfoils. I've heard the phrases a lot, but I've never been able to find specific definitions and how the airflow specifically behaves for them. Either way, thanks for the videos and welcome back.
Laminar flow describes the fluid dynamics. A laminar flow is when the air particles follow closely to the airfoil with out mixing or turbulence. An airfoil that creates burbles and swirls would be an airfoil that produces less laminar flow.
@@jamesdellaneve9005 I mean I know that much. But no airfoil works without mixing or turbulence, and there doesn't seem to be a huge difference in laminar flow airfoils in that regard anyway.
I have since read a few papers and taken what seems to be the description of a laminar flow airfoil from them. It would seem laminar flow airfoils are designed to create a progressive reduction in air pressure along the top surface. Ie the further towards the rear of the airfoil the lower the pressure. That would be in stark contrast to the conventional airfoil design which has the lowest pressure in the front third of the airfoil. The idea was that would help suck the air through the wing rather than creating a resistance to flow and thus introducing turbulence. It seems that concept didn't actually bear fruit and conventional wings could perform just as well, but a very similar design is beneficial in increasing the critical mach number and so the terminology often just overlaps.
Thanks for your suggestion anyway, though.
Olivia Lambert I am not sure if the actual airfoils are termed that way. Plus, it depends on that the goal or purpose of the airfoil is for. I work in aerospace but am not a CFD guy. I like some of the new dynamic airfoil technology. The new Bugatti track car has dynamic bubbles to create turbulence and I like Gordon Murray’s fan concept that increases laminar flow on the underside of the chassis which creates more downforce (lift).
@@jamesdellaneve9005 Laminar flow airfoil is definitely a very common term in the right areas. I really dislike the Burgatti turbulence concept, personally. My take is that a properly designed supercar shouldn't need maintenance heavy moving components and heavy materials simply to reduce the turbulence produced from the rear window. The take of this channel is that if they benefit both downforce and drag (as claimed) they shouldn't be moving and would always be deployed. One is reminded of the basic static vortex generators used in a few other cars for the same reason - it seems to me they would perform significantly better than merely producing turbulence regarding the flow attachment. And clearly they aren't all too concerned with the effect on the rear wing if that were their reasoning for avoiding them.
When it comes to the fan car, in terms of a race car its great. But when it comes to a car driven on the road it doesn't seem ideal, and from their releases they are avoiding all of the unique benefits such as downforce at slow speeds by turning the fan off at slow speeds or other odd choices. Ultimately it seems again a lot of weight, a waste of space, and frankly a gimmick, and the downforce numbers compared to some other cars seem to confirm that. It sounded like this channel seemed critical of that too, but when I last checked the video wasn't yet out (it might be now, though?)
You might find this video interesting. Greg's Airplanes and Automobiles ruclips.net/video/OqiG9VHuBbM/видео.html
Brilliant Video... keep up the great work buddy!
There should really be a no rules racing class for cars. I want to see technology, physical design/layout, and aerodynamics taken to their absolute fullest.
BTW, could you/did you do a series on the Nissan Deltawing? Wouldn't something like that dominate such a lawless race class?
Drunken Hamster people would die that's why there's regulations. Unfortunately it'll never happen
Drunken Hamster The organizations doing that will have the insurance up your ass.
You always need compromise...
Drunken Hamster
But, you might be able to get closer if it was some extreme solo thing where there's always only one car on the track.
true
but can-am did really well until McLaren then Porsche left
There is in Sweden! Time Attack Unlimited only has rules regarding safety and that the car needs to have a body, everything else is unregulated. They are not doing close contact racing though, more like qualifying.
timeattacknu.se/rulebook/
Yeah I was all up in Gray garage last year, only found yours now.
Kyle, your videos and explanations are incredible, thank you. One question, when measuring the AOA of my car's wing i use a flat plane across the top leading and trailing wing edges to get my angle. With a gurney flap on now, does this increase my angle considering it would raise the rear section of the level, or should i still be measuring only to the top on the wing surface and not take the gurney height into account?
More information on the DRS system in F-1. Detailed mechanics, performance comparisons, And development. Thanx
At first AAR put the flap on the rear wing but it stuck the rear down so much better that it caused bad push/ under steer. They added it to the front wings and got an extra 13 mph @ Indy. They had to hide it somehow for 6 months until then.
Easily one of my favorite aero devices
I really like your classical musics in the end, do you have a playlist?
Awesome; thanks, guys.
I understood everything you said. But how about adding a gurney flap on the top edge? Also, with an addition of a vortice generator on the leading edge (top part).
Thanks for this video
Really helpful video Sir. However, may I ask Sir about the reference wherein you said that the Gurney flap cannot be good to be applied on an airfoil with a flat lower surface. I badly need it for my thesis Sir. Thank you very much and have a nice day
Typically, what should the thickness of a Gurney Flap be? I know the height is 2% of chord length, but what about thickness?
Hey Kyle, thanks for the insight on gurney flaps. Do you think a gurney flap would be beneficial on the TRD ducktail of the 86?
***** It would improve the downforce slightly, but also increase the drag slightly. Either way I don't think you would really notice the difference.
Being a pilot and familiar with airfoil profiles and high lift devices I was wondering for years about why I never saw "Gurney flaps" on airplanes. I finally have an answer. Thank You
Now to see if anyone has tried "blown flaps" using exhaust gas to aid the flow on the wing surface and keep it more laminar. Of course if your using gurney flaps you don't care about laminar flow too much but maybe you could use an introduced flow from the exhaust gas to change the wing's performance at critical times?
Okay so, if my car wing is basically flat at the top and have curvature only at bottom there is no way, gurney flap will improve it, right?
what do you mean when you say "drive the air hotter"?
Aussie accent - he's saying "drive the air harder"
This may be nitpicky but how come you left out the part that you can take one off or put one one in seconds. Then drive a couple of laps and figure out if you made an improvement or not. The beauty in its simplicity
Can Anyone suggest a good book for understanding design of wings ?
Sai Shridhar competition car aerodynamics by Simon mcbeath. Volume 3
I’d start by looking at aeronautical papers and apply the results in 180 degrees 👌🏼 more research has gone into plane wings than car wings anyway! A lot more!
Magic is the correct answer
Smoke and mirrors is the real answer lol
Sooooo...a lip spoiler is basically just a glorified gurney flap?
How F1 gearbox works ??
+mrcds like other sequential gearboxes
Aerodynamics...
Felipe Gacitua ?
I should have said he mainly focuses on Aerodynamics. I hope he answears you, but i think someone like engineering explained will probably answear your question.. no hate . just saying
True story about 6 months ago a guy got a F1 gearbox sent to his house by FedEx lol
Intro to this video? No, do not like the hard pan right on audio and text at extremes of the video frame. Everything more centered would be less disorienting.
Future video topics: Details auto makers are using to make cars with less drag like; large flat features found on sides the chev volt, Prius, euro civic and so on (more boxy less curvy); how the new German sedans like the CLA are reaching a Cd of the first gen Honda insight coupe; thoughts on BMW's air curtain; aero mods of fuel economy (less drag)
Hamazing vids you've posted btw.
difflocktwo Good to know, I'd like if more people commented with their honest opinions. I have been considering dropping the intro for a while now but not sure how the videos would feel without it.
I've added all those topics to my request list, and thanks for the compliments!
KYLE.DRIVES Intro looks like dicks.
Nah it looks fine, I wouldn't think people give 2 shits about it. 90% of the time I play the video on a different tab because I can't stand looking at your face.
Does popping the collar of your superfluous jacket increase its effective chord? Because it's more of a drag than a lift.
prostwest 😂