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

Himanshu Rava: hi captain....can you please make a video about the black box.

IZ 9: Captain joe why does the cabin crew say all seat belts must be kept until the the aircraft has completely stopped?

Mr Sax Guy: What’s the largest heavy metal you’ve ever flown?

Pritam Misra: Great video. Explains the concept really well.

Panini Tom: The only reason this is your most popular video is because of the clickbait arrows in the thumbnail

64maxpower: after watching these videos I just need one of those cool uniforms and I can get a job flying an Airbus. I'll need a clean haircut too so I can look important like Capt Joe

Ahmed Awad: Dear captain.
Thanks for all video.
I' like travel all the world that's why I want to be a pilot. But the question I'm 50 years old I can pilot.

Tal Naor: I have a question for you. What is the flare before touchdown onto the runway?

Tal Naor: I like all your videos.

Tal Naor: Hey Captain Joe that video about the reverse thrust was very interesting. Now that I watch all your videos, it pushes me to learn more about Aviation.

member2126: Excellent video, I have a few questions.

1) If only the bypass air is directed in the forward direction what happens to the air passing through the engine core?

2) I have seen videos of aircraft engaging reverse thrust ( or at least opening the reverse thrust flaps) just before the airplane touches down is this recommended during certain conditions?

Soham Roy: Hello Captain,
Would you please tell me whether can I become a pilot with 125cm of Height?

ThexBorg: QANTAS

HiLal SaLeh: So that's why I see the jet engines go full thrust just after landing...
Very informative, even though I'm just a passenger

Sean van Heerden: It's Thrust Capt. Joe, not Frust!

Tim's scale model building: Where does he get the models

Yourtube User: Full Reverse Frust.

Andron MacBeton: To much bla bla bla. Shorter!

Flynmc: Captain Joe, in a future video can you explain the call outs prior to departure on the Airbus, for example, what is flex, trt? Thank you

tbugher62: Joe Looks like a F.O too me with 3 stripes.

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