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# Stall of the wing

The Coefficient of Lift and the Coefficient of Drag represent the changes in lift and drag as the angle of attack changes. CL and CD are not expressed by any physical unit, they are rather absolute numbers obtained from either wind tunnel tests or derived mathematically.
Initially both CL and CD increase as the angle of attack increases. At a certain point, the lift (or downforce) begins to drop while the drag increases sharply. This point is defined as the Critical Angle of Attack. If the angle of attack increases passed the Critical Angle of Attack, at one point all lift will be lost while the drag continues to increase.
Beyond this angle airflow can no longer follow the contour of the airfoil's upper surface. After the burble point, when airflow start to separate from airfoil, the airfoil goes full stall (video of aerofoil stall and CFD of same thing).

Stall can happen with all aero profiles and any other object used to produce some lift (or downforce). It can happen with airplane propeller, ship propeller, pump impeller, sails, fans and all kind of wings.

In F1 car design, stall can happen on all wings, venturis, flipups or diffuser.
Aero devices can be subjected to stall all the time, no meter what speed of the air across profile is, or stall can happened only on certain speed or certain situation.
For example, diffuser can work perfectly on strait line on smooth surface, but during cornering or on the bumps it can stall. Wing aerofoil can work perfectly until certain speed, and then suddenly stall.
It is job of aerodynamicist to solve this problem using experience, CFD, and wind tunnel.

January 14, 2018 at noon, aged 86, died Daniel Dan Sextorn Gurney, a racer, a team owner, a car manufacturer and a sage, American racing legend, a man who won four F1 grands prix in his 86 starts, the 24 Hours of Le Mans in 1967 and five NASCAR races. He also won races in CanAm and TransAm. He won 1967 Belgian Grand Prix driving an Eagle-Weslake, a car of his own creation, for me most beautiful F1 car ever (on my banner). In F1 circles, there was only one Dan. The American is also credited with the spraying of champagne on podiums and creating the "Gurney flap" aerodynamic device. In 1968, he became the first driver to use a full-face helmet in a grand prix. He is survived by his second wife, Evi Butz, sons Justin, Alex, Daniel Jr, John and James, and a daughter, Lyndee and by eight grandchildren. RIP Dan and thank you for everything. Godspeed.

Some useful links:

- f1technical.net, a great site with a lot of technical information’s and explanations. Site is updated daily with news from F1 word.

- autosport.com, This site is a legend. A bible for racing lovers. News from all around the word. Unfortunately, to get access to all news, interviews and to open the site completely you should be subscribed to Autosport magazine. Anyway, great read.

- JA.F1 site (or blog) ovned by ITV Sport’s lead commentator on Formula 1 James Allen

- joesaward is the Joe Saward official blog about Formula 1 world. Joe is an journalist, who write primarily about politics in and around motorsport, specifically on the FIA Formula 1 World Championship

- vitalf1.com/ is another great site for Motor Sports fan’s like me. Site is relatively new, but great fun, with great discussion forum, Formula 1 news and forum.

- f1.gpupdate.net, Site with fresh news from Formula 1

- planetf1, another site with many different articles, news and statistics. Biased toward British teams, but anyway good read.

- gurneyflap.com, Great history site. You can learn a lot from this site. Pictures, cars and many many more. Great.

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4ormula1 is a database of Formula 1 history and statistics of drivers, teams, grand prix, and all results since 1950.

Enjoy range of Podcasts and Articles on Motorsport. Every week a Formula one chat on Missed Apex F1 Podcast with F1 journalist Joe Saward and tech Analyst Matthew Somerfield as guests. Also the exciting all electric racing series formula E on eRadio Show and Bike Show Lean Angle Podcast.

-Racecar Engineering, an online magazine with a lot to learn from, a lot of technical information’s and explanations

- fia.com, La Fédération Internationale de l'Automobile, representing the interests of motoring organisations and motor car users. Head organisation and ruler in auto sport.

- wikipedia.org, I don’t believe that I have to tell you anything about this site. It’s not about Formula 1 technology, but you can learn a lot about that too.

- carbibles.com, a great site for normal car users. Here you can find explanations of almost everything about your car and how it works. Technical reviews and explanations of some in-car gadgets.

- Daretobedifferent.org Susie Wolff and UK governing body of UK motorsport have joined forces to launch Dare To Be Different, a high-profile new initiative which is about increasing female participation, not just on the track but in all aspects of the sport.