Do PLANES have ANTI-SKID??? How to PREVENT SKIDDING? Explained by CAPTAIN JOE

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Dear friends and followers, welcome back to my channel!

To be able to fly, an airplane has to accelerate to high speeds, in order to generate the necessary lift via its wings. This puts huge amounts of kinetic energy in the whole system. Now while being airborne, speed reduction is achieved solely by aerodynamic drag. Once the tires make contact with the runway, other devices such as thrust reversers and brakes mounted on the wheels, help decelerating the aircraft. To put the huge amounts of energy in
perspective, imagine my 747-8 Freighter with an almost maxed out landing weight of 340t moving at around 155 knots or approximately 290 kph at the moment of touchdown. That’s over 1.1 billion Joule of energy within this moving system! Hard to imagine? That’s the amount of kinetic energy an average car has if it would be travelling at around 4300 kph. Well, good luck handling that one! But back to topic, this energy has then to be converted to
achieve a speed reduction. The brakes are doing that in form of thermal energy simply known as heat. Modern brakes are packages containing multiple disc brakes made out of carbon fiber. They are mounted at the bottom of the main landing gear suspension. Every wheel has its own set of brakes. Some aircrafts have additional nose wheel braking. To
activate the breaks, the pilot pushes the rudder pedals with his toes resulting in this tilt movement. The pilot’s input is then transmitted to hydraulic pumps, powering the brakes. The harder you push, the harder you’ll brake. The pedals themselves can tilt independently, allowing the so-called differential braking, which enables better
steering and maneuvering. The whole process of braking after the touchdown can also be done fully automatic with no initial brake input by the pilot, but more about that in a future video. Let´s have a closer look on the wheel behavior while braking. The brake discs are separated by so called stator plates. While braking the whole assembly is hydraulically compressed, causing friction between the discs and the stators, resulting in a reduction of the wheels rotational speed. In theory, to minimize the braking distance, brake pressure is constantly increased while in return, the wheel speed decreases. In reality it doesn’t quite work like that. Wheel braking in general works in a way that incorporates slip in our
movement. 10% slip for example means that while the airplane covers 10 meters, the wheels only roll off a distance of 9 meters. This result is braking action. When the brake pressure reaches its maximum the slip reaches 100%, causing the wheels to lock. The locked wheels don’t slip anymore, they start skidding. Because the tire isn’t spinning, braking is
purely achieved by sliding friction between the runway surface and the rubber tire. This condition can lead to serious tire blow-outs which can then on the other hand lead to structural damage by hurled tire debris, sparks resulting in a possible fire or even a loss of control. To prevent this from happening, engineers came up with a system called the anti- skid system. It basically works just like your car´s ABS, the Antilock Braking System ...
Thank you very much for your time! I hope you enjoy this video!
Wishing you all the best!

Your "Captain" Joe

Big thank you to all other youtubers who provided me with the video material to create this video. Your content is highly appreciated. Please follow their channels:
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[kamaranskie]

JOE can you do a video about all tests/exams you need to take during you career after flightschool? That would be realy interesting!!

[pexpressairline]

3:00
Right hand side Captain Joe: speaking
Left hand side Captain Joe: am I a joke to you

[ZK-APA]

7:04 fun fact: the aircraft involved ( C-GITS) was able to be repaired, and returned in service

[orhunaltug]

BREAKING NEWS:Captain Joe to replace Lewis Hamilton at Mercedes F1. Can he win the title?

[GeFlixes]

Aircraft on an aircraft carrier switch the Anti-Skid off during carrier operations. There is a few reasons for this: The Carrier is coated in a no-slip material, and taxi is slow enough that skidding is a no-factor. Takeoffs via catapult and landings via trap are not dependent on braking action at all. Lastly, if the anti-skid system fails, in can take the normal braking system with it, leading to an aircraft rolling over the deck, potentially bumping into something or disappearing over the edge into the sea.
That last point is the reason why on an aircraft carrier, pilots arm the ejection seat immediately when the tie-down chains are removed from the aircraft, instead of just prior to taking the active runway for take-off, which is typical in land-based operations.

[whoyoulookingatabs]

The 60Hz Flicker next to Joe is killing me

[bryantsteury]

"They came up with the Anti-Skid-System or..."

THE ASS?!

"protection"

[raulpanotes]

Although I am a graduate of aeronautical engineering I am learning a lot more just watching Captain Joe's channel. Congratulations and thank you Captain Joe !

[Crckwood]

7:10 Commandant Piché : A national hero here in Québec, Canada.

Thanks for honoring him Capt'n!

[MVPever]

I like the fact that Joe explained that braking incorporates slippage.
Usually in high school they just tell you that static friction is greater than sliding friction and that, since the instantaneous speed of a rolling wheel relative to the ground is zero in the contact point, ABS will keep the wheels spinning so that they can transmit the maximum amount of power to the ground. Whereas, using more than one reliable source I've found out that the peak of the coefficient of friction happens when there is a certain amount of slippage. Surely the motion of the tyre in that condition will be closer to a rolling tyre than to a sliding one, but still it will be sliding; actually, when the slippage is zero, so will be the friction coefficient.

[hassana]

Captain Joe, I have watched a few take-off and landing videos from cockpit and notice that the pilots constantly are pulling the rudder back and forth. I think you should do another awesome video about why that's done. Thanks. Stay awesome

[nxncy]

I really enjoyed the graphics and editing and the overall knowledge I received from your video!
Thanks Joe! ❤

[ilovetotri]

You are so awesome! I never thought a video about ANTI-SKID, would lead to a reference about the AirTransat landing in the Azores! Glider pilot yes! Hero, still in question.

[milk-it]

It's wonderful to see your employer, Cargolux, supporting your videos. I really appreciate their cooperation, and of course your videos!

[davecrupel]

4:49 when he says "blowouts" he is being serious.
He is standing next to 4 bombs. 4 _very powerfull_ bombs.
Each of those tires are inflated to around ~250 p.s.i.
2 of them probably have enough air crammed in them to fill the entire interior of the plane to nearly 1 atmosphere. That includes the wing fuel tanks, fuselage and the hellhole.
Imagine that much air escaping the tire instantaneously.
Yeah. It can blow a car apart.

EDIT: I forgot to add, that pressure is when the tire is cool. Say, 60°F at sea level.
You all know that heat affects air pressure. Which is why you add somr to your car tires in the winter and release some in the summer. The same thing applies to aircraft tires. But the effect is greater because the tire pressures are _much_ higher.
If that tire lands in a hot middle eastern airport, when the black paved ramp is 150°F and the air is ~130°F, that tire pressure might pass 300 p.s.i.
And, more importantly, if that tire suddenly skids and burns rubber, or when the brakes are applied, that tire may suddenly be a few hundred degrees hotter. And that quickly heats the pressurized air inside.
And then...well...use your imagination.

[georgeb]

Great video! I really like the clever editing too✌

[dylaviation]

EXCELLENT video today Joe, thank you so much. I have always wondered why the plane jerks with more stopping force upon landing, so thank you for answering my unasked question!

[glx]

Hey cap! Just wanted to say we all appreciate the effort you put into these videos! I know you are too busy to respond to most comments, but if you see this, we all love your work!

[gabrielecossettini]

Same system of lock and release valves is used in locomotives and passengers cars to prevent wheel locking.

Thanks for the explanation and greetings from Italy

[LivingAviation]

Great video ! i am sure this is explained well! Why don't you make a 747 walk around video! 😜