TAKE-OFF Speeds V1, Vr, V2! Explained by "CAPTAIN" Joe

Dear friends and followers, welcome back to my channel today I'll be answering another very important question Joe, in many videos I can hear the pilots say this while performing a takeoff "V1" "Rotate" "V2" So what is all these ? These three speeds play a major part during takeoff roll so let's look at them in closer detail Okay first to know this again is a basic introduction about takeoff speeds The speeds we're talking about today will always follow in that order: V1 Vr or rotate and V2 and these speed apply no matter if you sit in a little twin engine Cessna or a Boeing 747 The speed definition is for either plane the same Okay let's look at V1 Imagine yourself in the cockpit of your plane and apply takeoff thrust to your engine and as you gently accelerate down the runway you come to a point where you reach V1 So by the book V1 is defined as the speed beyond which the takeoff should no longer be aborted Meaning that in case you experience any trouble with your plane before reaching V1 The classic example would be an engine failure, you would immediately abort your takeoff and would apply all necessary matters to bring the aircraft to a stop Although the use of full reverse thrust is not mandatory I'll come back to that in a second So in this video here this Airbus A319 applied takeoff thrust and due to a technical malfunction had to abort to takeoff prior reaching V1 Just listen to the sound of the engines Now the autobrake system comes active and immediately applies pressure to the brake cylinders the ground spoilers are deployed so are the reversers and the plane and crew come to a safe stop on the runway The smoke you can see here is coming from the brakes as they are the primary force slowing down the aircraft Now let's say there were to be an engine failure so one of the reverses would be inoperative and therefore full reverse thrust can't be added to the braking measures as mentioned before Because V1 needs to be calculated prior every takeoff taking into acount airplane weight, runway length wing flaps setting, engine thrust used, runway surface contamination and environmental factors and even the aircraft brakes to assure yourself that any given failure prior reaching V1 you'll have enough runway leftover to come to a complete stop Now if it's just a minor failure you can continue to takeoff but that's a whole another video about the stop or go decision making and besides that this is one of the reasons why the captain keeps his hand on the throttle until the pilot monitoring calls out V1 and then he moves his hands away from the throttle to not inadvertently abort the takeoff after V1 in case of a failure So in case you experience any serious malfunction after V1 You'll have to commit yourself to continue the takeoff otherwise a takeoff abort will lead to a runway overrun and could severely damage your plane Next speed to call out is Vr or better known as Rotate By the book, Vr is defined as the speed at which the pilot begins to apply control inputs to cause the aircraft nose to pitch up after which it will leave the ground Again Vr is also calculated prior takeoff in accordance with aircraft weight, environmental facts etc. And it's the point where the generated lift over the wings becomes higher than the aircraft weight keeping it on the ground Easiest way to memorize Vr is the point where the nose will leave the ground and vortexes are created at the wing tips which rotate behind the aircraft And the point where the main gear leaves the ground that's the point where you have reached Vlof, the liftoff speed Next speed is V2 Now some airlines still have the standard operating procedures to call out V2 Please comment below if you fly with such airline it would be great to know Okay, again, by the book V2 is defined as takeoff safety speed, the speed at which the aircraft may safely climb with one engine inoperative Okay let's go back to all engines operatives Now imagine all is normal you takeoff and someone would measure your height above ground at the end of the runway like in this picture here The height measured is the so-called screen height Now let's go back to V2 and our engine failure situation In case one engine fails you need to maintain the speed of V2 in order to leave the runway at a screen height of 35 feet or higher and maintain the climb rate at V2 to be clear of obstacles in the departure sector and you should be able to maintain that speed and climb rate until reaching one engine out acceleration altitude where you then gain speed and retract the slats and flaps and continue with the emergency procedures This video here is a great example for V2 As you can see the Boeing 757 hit a bird just after liftoff and the engine was severely damaged The pilots maintained V2 and the respective climb rate retracted the gear and performed all the necessary emergency procedures flew a traffic pattern and landed the airplane safely The reasons therefore is when local authorities design departure routes including obstacle avoidance procedures They predict that your aircraft is at least capable of maintaining V2 with one engine and the gear retracted and guarantee obstacle collision protection But trust me there's a little bit more to it so this was just a basic explanation of V2 Okay I hope you enjoyed this short little video about the takeoff speeds next week's video will be all you need to know about ram air turbines so stay tuned for that and tomorrow I will be uploading my 100,000 followers thank you video so please make sure to check that out because I need your feedback on that video you'll see why Thanks for your time, see you next Thursday and make sure to subscribe to my channel and check out my Instagram account @flywithcaptainjoe All the best your Captain Joe

Channel: Captain Joe

Views: 3,240,593

Rating: 4.9468594 out of 5

Keywords: Take-off Speeds, Airplane Take-off, V1 Vr V2, V1, Vr, Rotate, Airplane Speed, V2, Take-off safety speed, Airplane rejected take-off, rejected take-off, rejected takeoff, Engine failure takeoff, Engine failure after V1, Engine failure V2, pilot tutorials, captainjoe, flywithcaptainjoe, zfnhva, how to become a pilot, flightschool, airplane emergency procedures, engine failure

Id: 7p8Pqna4t7c

Length: 7min 18sec (438 seconds)

Published: Thu Mar 16 2017