WING LIFT THEORY SHAKEN – LA THÉORIE DE LA PORTANCE DE L’AILE ÉBRANLÉE

I had already written about that in my book UNE AUTRE HISTOIRE DE L’AVIATION, on pages 12; 13; 71; and others – Bernoulli’s principle does not explain everything. We know that aircraft fly. Strange as it may seem, Bernoulli’s principle has often been taught for decades as the explanation of the phenomenon.

Je l’avais déjà évoqué dans mon livre « Une autre histoire de l’aviation » aux pages 12, 13, 71, et d’autres: Le théorème de Bernoulli n’explique pas tout. Nous savons que les avions volent. Depuis des décennies, aussi bizarre que cela puisse paraître, on enseigne souvent le théorème de Bernoulli comme l’explication principale au phénomène.

This explanation would make sense if the air particles split at the leading edge of the wing and come together at the trailing edge. However, Cambridge researchers had debunked this flying myth in 2012, and have recently confirmed that Bernoulli’s principle cannot explain everything in wing lift. As you can see on the video above, the upper wing air stream travels much faster than the lower wing one. Last but not least, these air streams do not come together at the trailing edge since the upper wing air stream reaches the trailing edge well before the lower wing airflow. Isn’t this amazing?

Cette explication tiendrait si les particules d’air se séparaient au bord d’attaque de l’aile et se rejoignaient au bord de fuite. Cependant, des chercheurs de Cambridge avaient démonté ce mythe du vol en 2012 et viennent de confirmer que le principe de de Bernoulli ne peut pas tout expliquer dans la portance de l’aile. Comme vous pouvez le voir sur la vidéo ci-dessus, le flux d’air en extrados voyage beaucoup plus vite que celui d’intrados. Enfin et surtout, ces flux d’air ne se rejoignent pas au bord de fuite puisque le flux d’air d’extrados atteint le bord de fuite bien avant le flux d’intrados. Étonnant, n’est-ce pas?

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RED BULL AIR RACE – ABU DHABI 2017

Czech Pilot Wins First Race

The 2017 opener has been full of surprises. A victory of Mathias Dolderer was expected in Abu Dhabi today but the Czech Martin Sonka and his Zivko Edge 540 V3 had the last word thanks to his first victory in this competition. The German champion finished fourth. Two French pilots – Nicolas Ivanoff and François Le Vot – reached the Final 8 but failed to go through. Master Class results: Sonka (CZE) 15 points, Velarde (ESP) 12 pts, McLeod (CAN) 9 pts, Dolderer (GER) 7 pts, Ivanoff (FRA) 6 pts, Goulian (USA) 5 pts, Bolton (CHI) 4 pts, Le Vot (FRA) 3 pts, Brageot (FRA) 2 pts, Hall (AUS) 1 pt. The next race is to be hold in San Diego on April 15 & 16.

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LONDON AIRPORTS

Have you ever wondered how many Londonian airports have been built since the 1900s? Here is one of the best videos I have seen about this topic. It is one of a series produced by the comedian Jay Foreman. Thanks to this great source of information, you can have the answer as well as some fun.

Another interesting video tells us the train options to connect the six London airports to the City of London:

As you can see, it may cost an arm and a leg to travel to London. However, London airport system is the busiest one in the world. It demands a lot of concentration from its air traffic controllers as shown in this previous post: http://airforces.fr/2016/06/25/london-air-traffic-well-explained/

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