What is reverse thrust? Explained by CAPTAIN JOE

INSTAGRAM FLYWITHCAPTAINJOE: https://goo.gl/TToDlg MY WEBSITE: https://goo.gl/KGTSWK Today´s question is another favorite of mine. What is reverse thrust and when do you use it? Okay, I´ll break it down for you to the absolute basics. Reverse thrust is used to slow down the aircraft on the runway after touchdown. There are three main components which slow down the airplane on the runway: Primary Braking with disc or carbon brakes similar to your car Secondary with reverse thrust Thrid with aerodynamical braking with the ground spoilers So we have two words in reverse thrust. “Reverse” cause the turbines output is being guided into the reverse direction and as you might not know we apply "thrust" in order to increase the braking action. So let´s look at this video to see what happens at touch-down. Here you can see engine number one of a Airbus A320. At touch-down these flaps open up, so called “reverser doors”. They act as guiding vanes in the mid section of the bypass-channel of the turbine and force the accelerated air of the fan to blow into the opposite direction. Now these reverser doors don´t open automatically at touch-down, no you lift up these little levers which will activate the hydraulic system to apply pressure to the actuator which then opens the reverser doors. Keeping the levers in this position only give you “Idle reverse”, but as soon as you move the levers to the aft position, the engine will spool up creating more thrust increasing the reverse output. The engines will increase thrust up to 70% which then resembles in “Full reverse thrust”. I know it´s odd to think that you would apply thrust again just after touch-down. You can definitely hear the difference between “Idle” and “full reverse thrust”, trust me :) Using the reversers significantly decrease the landing distance, varying between aircraft, weight and environmental factors. If you look at this great video of here, showing a Boeing 747 touching down and applying full reverse thrust you can clearly see how the water on the runway gets blown forwards. I actually experienced that myself landing on a snow covered runway, we applied full reverse thrust and you could literally see the snow blowing infront of the aircraft. So when do you use reverse thrust? Using “idle reverse” at touch-down is mandatory by many aircraft manufactures and airlines. First and far most to immediately decrease the aircrafts speed and to stabilize the aircrafts roll out plus to reduce brake usage. Landing on wet or snow contaminated runways using reverse thrust is absolutely vital to decelerate the aircraft and preventing it from skidding and keeping it in a straight line. Full reverse thrust is not permitted at some airports due to noise abendement procedures or at least restricted in between hours from here to then. Nevertheless pilots can use full reverse thrust when deemed necessary, but might have to state their decision in a report. Airplanes with wing mounted engines may only use full reverse thrust until slowing down to a specified speed, cause using the reverser below that speed could blow up loose gravel on the runway which could get sucked into the engine and damage the turbine. For example in an Airbus A320 you would have to reduce "full reverse thrust to idle reverse" at 70 knots, and retract the reverser at speeds below 40 knots. There are many different reverser types out there, but all work after the basic principle by forcing the air or even the exhaust into the opposite direction. So I hope I´ve answered another aviation related question for you. If you have a question that´s been on your mind, don´t hesitate to write me, therefore subscribe my channel, check out my website and spread the word! Farewell your Captain Joe Info: Fairly often you see executive jets using reverse thrust during taxi, to reduce break usage whilst rolling down sloping taxiways. Cause of their high mounted engines pilots don´t need to worry damaging the turbine due to gravel on the asphalt. And the well know MD80 with her rear mounted engines use to have a power back procedure, where they used reverse thrust to back out of a gate position. I´m not 100% if that procedure is still around? Maybe you know? To me that looks very dangerous. Equipment I use: Camera: http://amzn.to/2nEHPDM Microphone: http://amzn.to/2nff2oF Lights: http://amzn.to/2nEPGkU

Comments

marta vieira: I "thrust" you cap.

Arcturus Sirius: Interesting fact: You can determine whether a plane was built by airbus or Boeing from afar at night by looking at the strobe lights. If they flash twice per second, the plane is an Airbus, if they flash once per second, it's a Boeing.

TomTom Tom: Never knew about reverse frust before this vid.

CLUB MED2: How does an aircraft wheels turn right n left...plz reply or make a vdo sir

Simon Turner: I always thought they did this as you hear it on landing but if you suck the air in the front and blow it out the front surely the net effect is nothing ?

sunny vadhavana: Hello sir,,
My self Sunny Vadhavana from India
My question is what is the winglets?

Sam Fu: Caption Joe why is there red paint on the pilons sticking out of the back of the wings on some planes?

lsgettier: I've seen videos of C5's and turboprops taxiing backwards. Are all jets capable of moving backwards on the ground with reverse thrust? Do any commercial jets have backup cameras? Are there any rules on this?

Angus's Kitchen: Why can't they use reverse thrust instead of pushback

SICKNICK06: Hey captain what song do you use for your outro?

naoyuki sasanami: Can you set in reverse position before touching down for an emergency case (aim at more STOL if possible etc) ?  physically restricted?

Corey WARNER: When ever a powerback is performed a marshal is always is always guiding and in charge of the aircraft until it is released.it is not dangerous it just takes skill on the part of pilot and marshal.

Kristoffer Kurtsson: Have you ever Done an Emergency Landing?

Henco Nel: I want to be a pilot, but am curious is there a height limit?

ILostMyName: Hey Captain Joe thank u for the german subtitles it helps me a lot to understand the complicate words! Good video.

Idris Dholkawala: Captain Joe can u explain what highdorlik system

Sanjay Puranik: Captain Joe... u da man! Good stuff bro...keep it coming.

ramit kaur bakshi: Hello captain Joe
I am from india 13 year old boy I am very found of aviation and I need you to make video explainimg why both the yolks are in movement if we make one in movement

Ralph Travis: Please don't use background music. For those of us with hearing impairment, it makes it almost impossible to understand Captain Joe. Thanks.

Preston Diniz: Why does engine opens when reverse thrust is applied

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