The Aerodynamics of Flight

The creator of this video allows full use of its contents for educational purposes.
geardownfs.com/
/ geardownfs
This video covers the basic aerodynamics that allow for all different types of aircraft to fly.
Everything in this video should only be applied in theory flight simulation. I am not a real world pilot, and therefore cannot testify on behalf of the actual processes of real world aviation.
Produced by Garth, with GearDownFS

[@CPS747-8]

I remember seeing this video in my 6th grade science class. I haven't seen this in ages! I know I was really interested in airplanes way back then and I still am now. Hopefully, I graduate next year with my BS in Aerospace Engineering. I'm glad this was a part of my life.

[@Xshado2]

Ever try to put your hand out the window of a fast moving car? Ever try to make a horizontal shape? Notice how depending on the angle of your index finger, your hand gets pushed up or down, or difficultly, not at all? That's how the wing works.

[@kambakktishq]

do not waste ur 7 minutes and 13 seconds on this video ..here is what you were looking for !!

[@ButterCookie1984]

Omigosh! This is a GREAT point! Yep, when hanging an arm out of the window of a moving car, the air seems to "lift" it no matter how much I try to push it down, as long as the car is moving forward at a great speed.

[@DreamersTouch]

+Amr rayyis Awesome explanation! Studying aviation and it sure is tricky! Thanks for this tip

[@ljukyguitar]

hahah i do that all the time during summer :)

[@YellowKurt]

My hand Is a dolphin!

[@Thetheobaudry]

We have thrust, Lift, weight, and Dreg

[@anniefeng1868]

oh I have lift drag gravity and thrust.....

[@elzbietaczerw9294]

@@saltyrice0 at least he can listen to the narator thats saying dreg not drag idiot

[@VerusAnimus]

That camera example though!

[@liangchristina7919]

Verus Animus 😂

[@paigeh8582]

Am I the only one commenting in 2020? Lmao

[@titaniadong9613]

dont worry sis im here too stuck in quarantine and doing online work 😢😢

[@alvaroakatico9188]

Is it me, or do the people commenting SAME are children with nothing to do?

[@chickennuggetdoctor5689]

nope lol

[@rhajibasadil7674]

no

[@AhHyn]

No you're not

[@tariqali3223]

a) Draw a typical aerofoil shape. b) On your diagram mark the chord line. Also draw the relative airflow on the aerofoil shape diagram as if the aircraft was descending. Label the angle of attack on your diagram. c) Draw the lift force and weight on your diagram. Question 2 a) Define the lift Equation. b) With respect to the lift equation describe how if an aircraft wants to maintain altitude yet increase and decrease its speed what properties must change, also describe how the aircraft may appear to an observer at slow speed and at high speed. c) With the use of diagrams explain how the angle of attack changes on an aerofoil section with the deployment of high lift devices (flaps). d) Describe again with respect to the lift equation what properties change to give increased lift with the deployment of FOWLER flaps. Question 3 a)Draw on a series of three diagrams how the airflow changes around an aerofoil section as it goes from zero angle of attack to the critical angle of attack. Also mark on each diagram the likely position of the centre of pressure. b)Explain washout on a wing and how it is helpful for aircraft control near the stall. c) Explain briefly how winglets improve fuel efficiency in the modern jet aircraft.

[@mazedurrahman3213]

very nice expression,suggegtions. Constructive. Thanks a lot.

[@nikolinechristiansen2743]

i'm in 8'th grade and this really helped out my project now i finally understand what all the websites didn't tell me

[@1makes1]

Do I have to say how much this helped me? Amazing my friend!

[@fetchanimations7109]

Thanks! I’m thirteen and I want to be a pilot someday and this gave me a clear bit of basic information to fill up my mind (:

[@domigrin4886]

Go for it!

[@munizam2613]

Eyy, Goodluck mate!!

[@shadoww7301]

@Sadie Stewart Do you still wanna become a pilot?

[@suspense_comix3237]

You can literally get a pilots license when you are 13. Don’t believe me? There’s this 13 year old girl who is trying to become the world’s youngest pilot to fly around the entire world.

[@ectoplasmic5789]

It's 5 years later now. Did we get a new pilot yet?

[@Cipher71]

4:23 I don't think I've ever laughed at an educational video before. xD

[@sashagawley5148]

4:23

[@Buzzlybee]

ur so immature it's just a word

[@mrlol9021]

@RL - 06MR - Great Lakes PS (1476) thats was 8yrs ago xD

[@DurosModz]

@@Buzzlybee it isnt about the word, it was the contradiction

[@giantfishy8249]

@@Buzzlybee it beep what word did it say?

[@neoskyflyer]

one of the best videos out there. from nil knowledge of aircraft aerodynamics to a general understanding right now. thank you.

[@mrs.healer1776]

Used this video for my first grader, big hit! Thanks for the hard work on the video and putting out this content!

[@TranspennineExp185]

Very Helpful, Thanks

[@MrAndreocity]

DREG

[@jueraljy9263]

DRREEEEGGGG

[@JackAD]

DREEEGGGGGGGGGGGGG!!!

[@Cinnabun]

DREEEGGGGGGGGGGGGGGGGGGGG!!!!

[@maryamqureshi6597]

DREEEGGGGGGGGGGGGGGGGGGGGGGGGGGGG!!!!!!

[@IsaacWolfOfficial]

Da Effect of DREG

[@evva1974]

Keep them coming, we are never too old to learn.

[@henriettegoldwater5447]

This video is amazing, the aerodynamics is explained in a very simple way. Thanks to it I finally understood much better what the aerodynamics of flight is.

[@nickislearning]

I agree with you!

[@suleshangodoyin548]

As part of Learning Engineering process, I really appreciate for the introduction of this topics with a big thank. It's me, Sule Shangodoyin.

[@WarrenGarabrandt]

Bernoulli's Principle does not fully explain how a wing generates lift; the physics of how lift is generated is complex, and involves the relative air speeds above and below the wing, the angle of attack of the wing, and the deflection of air streams. If it was only Bernoulli's Principle, then airplanes wouldn't be able to fly upside down.

[@Completeaerogeek]

The relative 'speed' of air above and below the wing is only relevant as an after effect of the passage of the wing. With an effective AOA, the Lower surface of the wing pushes the static air forwards and downwards creating a Newtonian upwards and slightly rearwards reaction (2nd and 3rd Laws). The Upper surface of the wing bends the air downwards while dragging it slightly forwards due to skin friction (form/induced drag) , This change of velocity causes a resultant force Upwards and slightly rearwards. .(F=MA) The upper surface air does not require any special effect to follow the downward slope of a conventional cambered upper surface wing. it has no choice-there are no vacuums in normal space. As the air turns the corner of the leading edge and changes direction its density drops. This combined with the change of direction and the fact the upper surface is on the leeward side of the moving wing creates a pressure differential. Voila, you have lift...No magic required. The test of any so-called lift explanation is whether it works with a flat plate aerofoil- if it doesn't it is wrong. No exceptions...

[@danutarozek4872]

Nobody cares

[@liamobrien9004]

@@danutarozek4872 you replied to a comment that was made 6 years ago

[@brilat222]

Liam O'Brien oh haha

[@riteshguleria8102]

Coanda effect

[@sci-clops5307]

Great short video! Keep up the great work!

[@shehimaliyah3816]

Super clear and concise, automatically subscribed. 😌👌🏽

[@FSXMovies]

Lol at the part with the camera xD Cool tutorial :D

[@SouthNorwichNews]

soooo helpful thank you so much

[@akajay6365]

Your thumbnail helped me get my flight license on bitlife

[@AV8907]

That was a really good explanation. Nice job!

[@beeschurgercom]

Thanks for the lesson ☺ I'll be using what I learned for my aerodynamics project

[@NataliesImperfectJourney]

So, I have decided to try to learn about stuff I had no clue about and today's topic was how a plane flies. So, thank you for giving me the "how planes fly" for dummies! It was great and super understandable!!!

[@navishkotwal]

hey you are learning aeronautical engineering or flying?? or just like that for fun ?

[@footsy420]

It's really pseudo information. There is some ttruthiness in there but the main hting that makes planes fly is how they are balanced to enable onctrol and the angle of the main wing to force air down. The shape improves efficiency but is not the reason planes fly.

[@NataliesImperfectJourney]

Well, I was really just looking to glean a little something on a subject I knew almost nothing about...

[@rebekahstayskal3736]

Thank you so much for explaining this so well!!! It was very helpful!!!

[@suleshangodoyin]

It's an interesting lesson to learn about this subject with appreciation and always like the production-show at all time. Sule Shangodoyin.

[@DK-mc9cn]

Oh god the Cc is hilarious. "Wat in Drake."

[@footsy420]

The description of lift is a bit off. First of all, it doesn't mention that the wing is so the front of the wing is higher the the rear. There is some lift from the lower pressure on top of the wing but its main function is to direct air downwards efficiently. By forcing the air down, there is an equal and opposite force pushing the wing up. In fact flight does not require an airfoil. Just a slightly angled straight wing directing air down will work albeit with less efficiency. The real secret to flight is proper balance, not the airfoil.

[@navishkotwal]

then tell me how an aircraft takes off from the ground?? if it is running parallel to the ground and aircrafts you see today have no inclined wings so why do they take off??

[@TvehX]

navish kotwal There are flaps on the wing that rotate downward and the wing is not parallel to the fuselage.

[@navishkotwal]

***** this is the thing which i wanted to check ...Dude don't just guess and post it on the youtube.You know nothing about the flight dynamics. .. All the aircrafts that you see today have Wings fixed to the fuselage and are not movable not even 1%.The movable part is the flap that is infact provided to change the relative angle of attack. .....Movable wings are still in resarch ...You can see the prototype in videos at youtube Scorpion is the name of the aircraft developed in early 90's which have movable wings to increase the lift and avoid stalling ...

[@TvehX]

navish kotwal not sure if you're an idiot or a troll. Go to college.

[@navishkotwal]

***** haha dude you can not fool an aeronautical engineer..I think you need to go to school and learn physics...!!

[@santi101090]

The drag is the force produced by 2 phenoms added: 1)The viscous friction between the air and the aircraft (Parasit drag) 2)The energy absorved by the vortex, generated by the wing lift. (Induced drag)

[@adamatraore2286]

This video is amazing! Thanks so much for educating me!

[@stuffedpigz4942]

The way lift is explain in this video is partly untrue. Wind tunnel experiments have shown that air does move across the top section of the airfoil faster. Instead, due to the shape of the wing, air is directed downwards. This, according to Newton's third law of motion, creates a equal reaction towards to aircraft from the air. Your explaination is not entirely correct as Bernouli's Principle suggests that the air passing the airfoil must join back together at the trailing edge. Studies at Cambridge Univercity has concluded that air does not rejoin. The theory also ingores Newton's third law of motion, it does not contain a description of the opposite reaction caused by the air directed back by the airfoil.

[@davidkrowa4153]

+StuffedPigz can you please cite these experiment? Id like to look into this more. So in essence a wing is the same as a fan? And Bernoulli principle is nothing more than a covered up 3rd law of motion?

[@stuffedpigz4942]

The*

[@kchrisc]

+StuffedPigz You hit the nail on the head. Now take it a step forward. Lift in aircraft is generated by accelerating air downward, much like a rocket. Therefore aircraft are sustained in flight in accordance with a Newtonian Third Law exchange of force/energy downwards. Rockets also utilize the Newtonian Third Law to fly by directing force/energy downwards. However, with rockets it is quite clear that massive amounts of energy must, and are, consumed in sustaining flight. What of the energy consumption of aircraft? How do they sustain themselves in the air for so long with less energy consumption rates than rockets? What is the primary source of energy utilized by aircraft to generate lift, and to sustain flight? That would be gravity--Gravity provides two-thirds to three-quarters of the energy utilized in generating lift on an aircraft's wings. Essentially a plane is always being pulled downwards by gravity. That pulling force causes air to flow over an aircraft's wings, accelerating the air downwards, generating lift. Additional energy then is required to overcome drag, and to generate the additional lift required for level or climbing flight. That energy comes from the conversion of chemical fuel energy to thrust in the engines. Aircraft are then sustained in flight by air accelerated downwards by the wings with energy derived simultaneously from both gravity and chemical fuel energy induced thrust. This fact is lost on most, the vast majority, due to the use of Bernoulli, and/or "faster transit" in the teaching of aerodynamics and the nature of lift and flight. If one doubts this, be reminded that planes have the ability to fly/glide if thrust is lost--The glide-ratio. That is, without thrust the plane's/wing's conversion of gravitational energy becomes apparent. The above fact is also why mankind can fly multi ton aircraft for thousands of miles, but are unable to create a viable jetpack that a single man can fly for more a few minutes. The jetpack has no gravitational energy conversion mechanism, and therefor is solely reliant upon its carried energy in sustaining it in flight.

[@antoniolucena7304]

+kchrisc thats the readon why you shouldn't believe in everything on the internet

[@antoniolucena7304]

The wings were not 100% parallel to the ground. They had some degree of inclination.This way they were able to create some air acceleration downwards. Eventhough the drag was awfull

[@unfiltered577]

Wait, but if mg=lift, it wouldn't take off.

[@fredydelamora9301]

weight equals lift only at steady flight

[@capplething]

Im in love with the sky, and had dreamed of being on an airplane and becoming a pilot. Obviously to become a pilot, I’d have to study the basics and controls of the plane and how it works. This video helped me understand aerodynamics more. I’m 15 and I’m hoping that the things I learn about aviation at this age will help pay off.

[@GearDownFS]

We're going to cover the subject of general aviation. In the sim of course. We won't be doing any major tutorials or guides on PMDG or Level-D until we cover the absolute necessity. We plan on shifting to the default commercial jets after *finishing* with the props. No idea when that will be. As well, a lot of people don't have these payware add-ons. Those who don't even still enjoy watching videos about them. We won't leave them out.

[@johnhammond7202]

Why is he pronouncing it "dreg" sometimes instead of drag... ISH TOO MUCH DREG, WE CANNOTS FLY!

[@williamparker543]

IDK, but it says Drake in the Closed Captions

[@crimsonassassin5828]

@@williamparker543 yeees

[@crazycraftyeshwanth1322]

Who watching this in 2024 vote here 👇👇

[@vigneshgk5334]

Excellent Definition of Aerodynamics working method in flights.very useful

[@DannyOvox3]

Thank you for the video. This was easy to understand.

[@mia_bentzen]

dreg... dreg..... DREG. DDDRRREEEEGGG... it's drag buddy

[@gergthewerg]

mate its his accent

[@minecraftiscool6066]

best anime 2017

[@JulianAvalos]

Enjoyed your video. Keep producing!

[@kasimsaleem9238]

oh my friend' ..it is really a great help for me i am satisfied by and now feeling that i now actually know how all forces act...thanks for this really helpful video

[@karinawagner3374]

neat... i needed this vid for school...

[@footsy420]

this vid teaches some misconceptions.

[@thefarah7751]

Chris Foote Could you please tell me what is the misconceptions about? Cuhs I am a bit confuse about your post up there ^ about the wing and so on. M not that educational tho, thank you (:

[@giantfishy8249]

O:

[@breezybz]

Hi my sister.

[@giantfishy8249]

@@breezybz hii bri

[@breezybz]

@@giantfishy8249 :D

[@kunaljadav625]

Awesome explanation. like the way you used the example of the 737 to start and end the video.

[@elisemuhammad3624]

I love the way he explained it.!

[@becz2cool4u3]

2021 anyone?? here for school.

[@j.chenmuas]

Me becoming an A&P mechanic!

[@dirkhoekstra727]

Now if you want to know the real truth about how lift works on any wing and not this old, archaic, poorly researched Bernoulli theory, read Jim Davis' PPL training book.

[@dirkhoekstra727]

Bernoulli's Principle applies to fluid dynamics in venturi systems and cannot be applied to aircraft wings! Lift is generate not with pressure difference between the bottom and top of a wing, but mainly because it deflects air downwards. Because of Newton's Third Law that states that for every action there is an equal and opposite reaction, this means that as the air is deflected down, the wing is deflected upwards. Take a completely flat wooden plank and stick it out of a moving car's window at a slight angle (angle of attack). The plank will deflect air down and as reaction will lift upwards/backwards. This is how the BOTTOM of the wing creates lift and surprisingly it creates only 1/3 of the total lift! 2/3 of the total lift is created by the TOP of the wing. Because of the shape of the wing, the top of the wing also deflects air down. It does this by means of the Coanda Principle and Newton's Principle. Coanda proved that a stream of fluid or air moving closely over the surface of anything it passes over, will tend to cling to that surface. To proof this at home, hold the rounded end of a spoon so that it just touches the downward stream of water from a flowing tap. Water will cling to the surface and deflects to one side. The spoon will be deflected in the opposite direction. So the top of the wing (because of the airfoil shape) also deflects the air down and result in the wing lifting up. Obviously if the angle of attack becomes to large (angle between relative wind and wing cord line) air over the top will not cling to surface anymore and become turbulent. Downward air deflection will stop at top of wing and the wing will stall.

[@PeterRumanRumo]

Dirk Hoekstra I think the basic point was well made - it's the shape of the wing. cheers.

[@LiquidSasha]

Peter Ruman LOOOL

[@lizandroalarconcarrasco4873]

that book you mentioned is just a booklet... your knowledge in aeronautics does not seem accurate.. your opinion is worthless, trust me.

[@dirkhoekstra727]

Lizandro Alarcon Carrasco Jim Davis has over 10000 hours of training civil and military pilots, 4000 hours of corporate flying, charter work, aerial photography and surveying. He has performed in aerobatics and pylon racing. He pioneered flight training in South Africa with his first full time flight school which he started in 1989. Called 43 Air School, the school gained world wide reputation for quality training and attracts customers from all over the world. First off all, I own the book. And I know the difference between a booklet and a 504 page book. Secondly, I couldn't really give a fuck what you think of my opinion, but to question the opinion of Jim Davis is a little concerning.

[@sohailbarishams5574]

Explained so many informations. Very nice

[@Dougie24282428]

Excellent way to explain!

[@PupperzP]

i don't like to learn

[@assassinwizardxd3643]

learning is good because you have more knoledgement to know how and why we are living. if theres something interesting that you want to learn you'll need tosearch and study and practice. one thing is learning something that you like and another thing is obligating you to learn

[@glaceonlove8272]

but i think you need to learn how to spell

[@FarklePlaysGames]

My teacher showed me this just now

[@user-eq1wk1cy5u]

Hue hue hue

[@crimsonassassin5828]

mine only now

[@user-fh8hv6ve7p]

this was such a funny video that explained all the principles simply and effectively. Good job!

[@yacoubkalander19]

One of the great video regarding the Aerodynamics of Flight

[@BeepBoy]

bruh, why is this guy so emotionless? he sounds like technoblade but less funny lmao,,

[@justin.c09]

hes just trying to be clear

[@justin.c09]

but im not disAgreeing

[@chrisgreening2194]

dreg

[@oslosecurity]

My 8 year old is doing a science fair project in elementary school and this video was great for explaining the basics. So wanted to say thanks for uploading!

[@xh2015]

Thanks this video helped a lot with learning aerodynamics

[@Observ45er]

Why, oh why do so many people insist on making video after video with poor explanations of things such as lift...?? and that they don't understand how to securely mount a camera.... Yea! that makes *ME* want to believe the rest of what this guy says...That's the ticket! ... sigh. ... "The wing itself doesn't generate lift." Wha? I guess the wing has nothing to do with it, eh? Oh. I get it. The shape of the wing is not part of the wing itself. Where do these people get this stuff?? ... The pressure difference does not produce lift. The pressure difference produces ONE of the effects that contributes to the total force called lift. .... Somehow not being a pilot (or technically educated) somehow makes this author qualified to give instruction on aerodynamics...got it! ... and Yea; the *best* way to demonstrate DREG is to show that we don't know how to securely attach a camera in the slipstream...Cute! ... "This video covers the basic aerodynamics that allow for all different types of aircraft to fly." Except for lift and how to pronounce Drag.

[@TomokoAoi]

Thanks for the video. Very easy to understand.

[@mechanismsandparts2724]

The video is very good! Thank you for uploading!

[@stefankozma]

It depends. If you go fast enough (if relative airflow is great enough) most aircraft will rise by themselves at some point, with no pilot input. Most aircraft have their wings set at an angle greater than the body (the riggers angle, usually 4 degrees) so they produce flying lift without much pitch up.

[@Blackdragon1998ful]

I would like to thank you, I will be needing to study this soon. And a friend showed this to me, I can do some pre studying now thank you.

[@GregMunning]

Good video, great sense of humor!

[@TRiiKzZ1CoD]

thank you so much great video Gareth !

[@LadyLaurenBaywatch]

That was really useful. Thank you!

[@kalebketchum7289]

Holds up in 2024 for the private pilot in training thank you

[@blees123]

Thank you for the explanation.

[@Taidanaoineko]

studying atm and this might help me improve during our ground school classes

[@Waadee101]

Hey Nice Video. Very Educational. I had one Question. How did you shoot the footage? Did you use a video game?

[@kevinthomsons]

Awesome video. And I liked the camera part. How did do that?

[@adidoingthing1832]

Great job. keep up the great work

[@donedrivingschool]

thanks for the info. very helpful

[@stefankozma]

Yeah that is correct. Getting kinda technical, but there are 2 main types of drag affecting an aircraft. Parasite drag is the general drag we usually talk about due to friction from the air. So when thrust is greater than drag, the aircraft will accelerate, but not for ever. As the aircraft's airspeed increases, so does the parasite drag, until the Drag is again equal to the thrust, and the aircraft is stabilised at this new airspeed : )

[@robeval13]

wow, amazing job!

[@DoubleOneZero1010]

great video! thank you and the camera falling off made me laugh haha

[@newfiebullet6804]

This really help me with me quiz that is tomorrow and it's all about what this video is talking about like drag and lift

[@nhadley88]

Induced drag occurs in three dimensional flow. Because the wings have a finite span, the flow spills over the tips of the wing (down wash). Down wash causes the wing to see the flow at a different angle of attack. This difference in flow angle causes the lift created by the wing to have a drag component. Essentially, the lift is pushing backwards and upwards at the same time. The backwards component of lift is called "lift induced drag"

[@openworld1566]

How did he do the camera - thing? I've never seen the option 'attach camera and let it drop' on Flight Simulator

[@samacumen]

Great video.. Hats off !!

[@elnica0941]

Great video. You are the man.

[@meller7303]

Would it be important to say that the y component of lift must > weight? Because with a high angle of attack, lift is not parallel to the force of gravity, and therefore some of the lift force is in the x axis, causing induced drag. As angle of attack lowers, and lift force becomes close to parallel, induced drag lowers.

[@abhiutd92]

awesome explanantion.HATS OFF!

[@TheEpicNik_]

Best video to understand this topic

[@nathancosta7155]

Bernouli's principle is only applicable to straight streamlines, not curved streamlines which is the case when speaking of lift forces on an airfoil. It is the flow curvature over the upper and lower surfaces of the airfoil that generates lift. Hypothetically, if you were to walk downwards toward the upper surface of the airfoil from the space far above it, you would experience a negative pressure gradient. You will continue to pass curved streamlines with lower pressure than the ones previous. The lowest pressure will be reached once you reach the upper surface of the airfoil. The pressure just above the upper surface of the wing would be lower than atmospheric pressure. Conversely, if you were walk upwards toward the lower surface of the airfoil from the space far below it, you would experience a positive pressure gradient. You will continue to pass curved streamlines with pressures greater than the ones previous. Thus, the pressure just below the lower surface of the airfoil would be greater than atmospheric pressure. The resulting pressure difference between the upper and lower surfaces of the airfoil (p_lower > p_upper) generates upward lift forces on the airfoil. This is the proper way to think about lift.

[@maxspeed1628]

EXCELLENT VIDEO !!!

[@ricp]

the book "Stick and Rudder" by Wolfgang Langewiesche explains LIFT in much more simple terms,.. the Wings push the air down (given it has positive Angle of attack) , and with the proper speed, having pushed enough volume of air down - the airplane takes off. it's a fascinating read

[@mur3na11]

Nice video for beginners in the field!

[@flightsimy]

super, love the bit with the camera =¬D defaintly 5/5*

[@lukesun7241]

Helped me with my science fair project, thank you.

[@kristinnjonbaldursson6535]

great video in all places

[@bethmoritz1346]

I was looking for a video show a group of 5-9 year old kids in our homeschool co-op group. This may not be the one for that but I thought it was a great video on explaining flight to me so that I can better explain it to kids. Thanks!

[@MasboyRC]

Nice explain and presentations, it's make easily to understand. Thanks for sharing

[@auachiuaua]

nice explanation, thank you!

[@irishroker02301]

Super helpful, great video. Thanks

[@ktihagen6652]

Thanks man. Really helpful

[@sohail1855]

Hello Pilots, Do I understand it right that, Stall will happen when you have a large angle of attack at relative low speed? But if, with the Same Angle of Attack, the speed is much higher, then stall won't happen. Right? And the plane will climb up of course. Right? If not right, Then how come that fighter jets and other acrobatic planes can climb strait vertically? I suppose this is because of their high speed, which provides enough lift, no matter in what direction or angle they move. So why can't normal plans in a critical angle of attack give full thrust to gain more lift? The air is the same everywhere in the sky. Why behaves the air different if we want to fly in an angle which is not parallel to the horizon?

[@nhadley88]

Depending on the naming convention this can vary. However, when studying aircraft performance, typically "V1" denotes the velocity of the aircraft just before take-off. "Rotate" (or "Vr") is the rotation velocity of the aircraft. Rotation velocity is the velocity where the aircraft is rotating on the rear landing gear. Since lift is proportional to velocity, at Vr the aircraft is not quite producing enough lift to completely take-off -- lift is less than weight. When L > W the a/c takesoff