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

Michael O'Quin: I am elderly, and the music interferes too greatly. Sorry. If I want music, I'll get music.

pratik kumar samantaray: can i start the APU 39,000 feet ?

Amogh Wadhonkar: why don't the engine just spin in opposite direction ? sorry if it was a dumb question 😅

Michael Godwin: Question Jean Captain Joe.. where are you stationed at or where do you fly out of all the time and do you ever take anybody hear you have a small plane did you take people up in because I would love to learn how jets work I fly but I only fly Cessna and I've only flown a glider and a Cessna but I'm very fast picking up I wish you could take me up and teach me about jets and planes I can fly I just don't have a license 😞🤣😞because I'm not smart in math that's why I don't have my pilots license but I live near several airports in the pilot used to take me up. Thank you captain Joe keep up the informative videos

Michael Godwin: I'm 38 and as long as I live in an airplane was always wondered I thought that the propellers well I'm sorry the blades inside the engines slow down like super fast and then went into reverse that's what I've always thought and I wondered how could that happen so many times about the something then breaking because it has a stop and go backwards all of a sudden but I guess in reverse thrust the flaps open up and shoot the air backwards..☝🏻☝🏻😁😁🤙🏻🤙🏻 thank you captain Jo for 30 some odd years I've wondered I thought you know if the propellers well the engines and the blades if they had to stop and go backwards within a split second I knew something would break and I I just cannot fathom how that worked thank you captain 👩‍✈️ joe

Josh Fujii: reverse thrust is beautiful

Racky Wacky: Sir plz explain the simantanius use of aeronols and radar. To steer the plane

Michael Talbot: Hay captain Joe could you please explain how you use anti skid

RAGHAV JHA: While landing, does combustion take place inside combustion chamber of engine??

ishzi: Is it possible to reverse a plane with reverse thrust?

praveen theking: how do you keep a flight in line

Luke Dawson: You use it to push-back! Hahaha JK 🤣

Bob Brown: I heard they use reversers for push back in Russia. Is that true?

prakash reddy: thanks captain Joe. thank u. for guidance. it was really complex mechanisms for the control system of the aircraft

Asim Ali: on what time do they have to get up and go to the airport.

Theodoros Kefalopoulos: Yesterday I landed at LCY and i was sitting on top of the wing. I suddenly saw the turbine side retract and the result was immidiate, like being pulled from behind. The Bombarider came to a hault faster than i ever recall. Thrilling stuff!

Wild Card Placement: What is reverse frust?

ApexPredator_: The background music reminds me of Mass Effect 2.

Rajwardhan Sagare: hey Joe why don't
the they reverse the motion
of turbines in the opposite way after touchdown
#captainjoe

WildRover1964: Hello Joe. I'm hoping one day that you can explain those little fins on the engine nacelle - I know that it's something to do with diverting air over the top of the wing to improve lift but I'm hoping you can go into a bit more detail like how much extra lift in Newtons and so on. Love your channel and your work :-)

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