# Aerodynamic efficiency

A term used to describe the relationship between the downforce a car generates, and drag.
Straight line speed depend of aero efficiency. Normally, with more downforce generated by wings, more drag is generated.
Some specific parts of the F1 car can create an exception. Diffuser and undertray for example is very efficient in creating downforce with small drag penalties.

I have to say something about modern F1 cars. I doubt that there is any among all of them at the grid that has a complete correlation. A modern F1 car has so many difficult interactions between vortices, streams, wakes etc. This area is extremely sensitive, and you only need a vortex stream to move by a few centimeters and it can really change the characteristics of the car quite a lot. It is impossible to produce downforce without producing drag, but the job of the aerodynamicists is to produce as much downforce, for as little drag, as possible. At a given circuit, all the cars on the grid tend to set their drag levels to very similar values. However, at this same drag level, the front of the grid may have more than 30% extra downforce compared to those at the back of the grid.

You can often hear aerodynamicist talking about aero efficiency gain in "points". For example rear view mirrors shape can bring the gain of less than 0.005 in aero efficiency gains, downforce/drag ratio, or half "a point" in an aerodynamicist’s language, from one decent mirror design to another. However small it looks, one will still gladly take these half point gain.
For reference, 3 points of aerodynamic efficiency is around a tenth of a second in lap time.

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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.

- 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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-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.

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