Vous êtes-vous déjà demandé ce qui se passe vraiment avec les avions ? Dans cette vidéo, nous plongeons dans des faits incroyablement cools sur les avions, y compris le TikTok viral expliquant pourquoi votre siège d'avion affiche 80°F—même lorsque la cabine ressemble à un congélateur. Des secrets des coulisses sur la pression de l'air aux raisons pour lesquelles la nourriture d'avion a un goût si différent, nous avons tous les détails croustillants. Vous apprendrez quelques éléments qui pourraient même rendre votre prochain vol un peu plus intéressant (ou au moins vous donner matière à réflexion pendant que vous attendez le décollage). Que vous soyez un passager fréquent ou que vous aimiez simplement un bon fait, cette vidéo a quelque chose pour vous. Alors attachez votre ceinture et appuyez sur lecture—vous ne voudrez pas manquer ce vol de connaissances ! Animation créée par Sympa.
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Musique par Epidemic Sound https://www.epidemicsound.com
Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna
----------------------------------------------------------------------------------------
Nos réseaux sociaux :
Facebook: https://www.facebook.com/sympasympacom/
Instagram: https://www.instagram.com/sympa.officiel/
Stock de fichiers (photos, vidéos et autres):
https://www.depositphotos.com
https://www.shutterstock.com
https://www.eastnews.ru
----------------------------------------------------------------------------------------
Si tu en veux encore plus, fais un tour ici:
http://sympa-sympa.com
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FunTranscript
00:00A TikTok user was returning from New York to Toronto, Canada, late at night when she noticed something strange, and her video went viral.
00:09She took a look at her neighbor's screen, which displayed 27C, or 27 degrees Celsius, in one of the corners.
00:16She then noticed that the screen in front of her displayed 26C.
00:21Like the rest of the screen displaying the image of a tropical landscape, she thought it must be the temperature of their destination in degrees Celsius.
00:29But they were all going to Toronto, and it was the end of October, so we were far from the tropics.
00:34So, what was this temperature like, and why the hell was it slightly different from one seat to another?
00:41It took her some time to understand that the numbers and letters actually corresponded to the location of the passengers' seats.
00:48Many TikTok users supported the young woman and indicated that they had to read the comments to understand what was really going on.
00:57A plane is generally divided into several zones. Each of them has its own air conditioning controller.
01:04These gadgets look like the thermostat boxes that most people have at home.
01:08Except that each box in each zone of a plane's cabin has a distinct setting.
01:13So, the temperatures can be slightly different depending on where you are sitting.
01:18But the crew members usually set the temperature between 21 and 24 degrees Celsius so that you feel at home.
01:25It is the temperature that you set most often on your thermostat at home, isn't it?
01:30And since the body temperatures vary from one person to another, the crew of the plane most often aims for the bottom of this fork,
01:36especially in summer, during morning or afternoon flights.
01:40It is preferable to be a little cold rather than to sweat, because it is more difficult to breathe when it is too hot.
01:47And those who have trouble with transport can feel even worse if the temperature is high and if there are turbulences.
01:54The air conditioning of the cabin also extends to the suit, below the passenger cabin.
01:59It is much colder in this part of the plane. In addition, the suit is less well insulated than the cabin.
02:05It is about 6.5 degrees Celsius in the suit of a Boeing 767.
02:10But in the area where domestic animals travel, it is basically about 20 degrees Celsius.
02:15Depending on the position of the plane, the heat comes from three main sources.
02:20When a plane is parked at the boarding gate, it usually uses a source of air from the ground.
02:26This air, called pre-conditioned air, APC, comes from a voluminous air conditioning device located on the ground.
02:34You may notice a large yellow tube connected to your plane.
02:37It is thanks to it that the pre-conditioned air enters the cabin.
02:41Sometimes, a gas truck can be used instead.
02:45Pre-conditioned air is generally treated with electricity.
02:49Which is cheaper, cleaner and quieter than running the plane's engines.
02:54But it is not always enough to cool the cabin.
02:56Especially when it is hot, or when the tube has folds.
03:00Cities like Las Vegas and Phoenix, where it is very hot, have some of the best pre-conditioned air systems in the United States.
03:07The second source of air on board is the GAP, or auxiliary power group.
03:12It is a mini-motor located in the tail of the plane.
03:15It is the second option used to cool or heat a cabin.
03:18Especially if the air on the ground is not available.
03:21The GAP can work even when it is extremely hot.
03:24During a quick stop, the GAP can stay running to keep the ambient air at a comfortable level.
03:30If the plane is preparing to leave the boarding gate, the GAP starts running just before the pre-conditioned air is disconnected.
03:37The main engines in the plane can also supply air to the cabin.
03:41This happens when the engines are running, usually during flight.
03:45The engines can keep the cabin cool or warm while ensuring the pressurization of the plane.
03:51If the cabin is too hot or too cold, the pilots can remedy it by starting the engines earlier.
03:57Otherwise, they can use other sources of air.
04:00This does not always work, especially when temperatures rise and planes overheat on the take-off runway.
04:07An air hostess says that because of the heat, suffering from dizziness,
04:11she one day felt disoriented and even fainted on board her plane.
04:16Another flight in Florida was delayed by an hour because it was 34 ° C inside the cabin.
04:23The boarding agent told the passengers that they had to wait for the temperature to drop to at least 29 ° C to board safely.
04:31The sun was not yet up at that time.
04:34Unfortunately, external air conditioners and auxiliary cooling systems
04:39do not always work properly due to maintenance problems.
04:42You will feel more or less comfortable on board a plane depending on the type of aircraft used.
04:47The most recent aircraft are equipped with more advanced technology.
04:51Some even have a temperature regulation system per row.
04:55You will therefore have to agree with your neighbors to get the temperature you prefer.
05:00But there is also the problem of cost control.
05:03Some airlines force their pilots to save on fuel and maintenance
05:08and do not allow them to use the auxiliary power group and other engines
05:12when the plane is at the boarding gate or on the runway.
05:15If they use too much fuel for the auxiliary engine on the ground,
05:19they may have to refill it a little later.
05:22Another important problem related to heat is the impact on take-off.
05:26Planes are very heavy and gravity attracts them to the ground.
05:29To rise in the sky, they appeal to the lift,
05:32that is to say to the force that opposes the weight of the plane and maintains it in the air.
05:37When the air is warmer, it expands,
05:39which means that there are fewer air molecules to push the plane up.
05:43A plane loses about 1% of its lift every time the temperature rises by about 15 degrees.
05:49By very hot weather, it can therefore be much more difficult for planes to take off
05:53and it can sometimes even be impossible.
05:56This problem is particularly delicate in airports located at altitude,
06:00where the air is already less dense, and in airports with short runways,
06:04which leave less time for planes to accelerate.
06:07For example, at 20 degrees Celsius,
06:09a plane may need a runway of nearly 2,000 meters long to take off.
06:14But if it is 40 degrees, the same plane will need a runway of 2,500 meters.
06:18In 2018, because of a heat wave in London,
06:2114 flights had to land some of their passengers.
06:24The incident occurred at London City Airport,
06:27whose runways are shorter than those of other airports in the region,
06:31which forces the planes to take off at a more pronounced angle.
06:34It would have been impossible if the plane had been fully loaded.
06:38And it would have been necessary to use a lot more fuel during the flight.
06:42During another flight, the airline had to ask 20 passengers to take the next flight.
06:47As no one was volunteering, the plane was going to Ibiza,
06:50the managers had to select passengers at random.
06:54This lightened the plane and allowed it to take off safely.
06:57Scientists have also noticed that the headwinds that help the plane take off
07:02slow down by about 2 or 3 knots per decade.
07:05This reduces the maximum weight of the planes when taking off.
07:08If you are more concerned about the cold than the heat,
07:11we have good news for you.
07:13Flying planes at nearly 8,000 meters in altitude,
07:15they are quite capable of withstanding temperatures of about minus 56 degrees.
07:20The fuel is preheated to the ground and, once the plane is in flight,
07:24its engine heats it up so that the temperatures are no problem.
07:28Cold air helps planes to fly better because it is denser than hot air.
07:32Thus, they take off faster and fly more easily.
07:36But the cold weather also has its drawbacks.
07:39For example, ice and snow.
07:41If ice comes to stick to, say, the wings of the plane,
07:44it can disrupt the passage of air and cause difficulties for the pilot.
07:49To remedy this problem,
07:50ground staff usually spray an antifreeze liquid on the wings
07:54to melt the snow and ice.
07:57Once the plane is in flight, the wings are protected from the ice
08:00because the engines heat them up
08:02and the speed of the plane prevents the snow from adhering to the fuselage.