You may have noticed little numbers popping onto screen throughout the video. These are referring to references in the description of the video. This was inspired by my friend, Simon Clark. Specifically this video: th-cam.com/video/xYTvMWtmdnE/w-d-xo.html Props go to him for the clever technique.
You should look at Boston's Logan International Airport. It is formally one of the busiest airports but has lost popularity primarily because it defies all the things you talked about in this video.
Real Engineering I just have to say, if you buy a house next to an airport and then moan about the noise then you're an idiot, and I don't see why they don't bulldoze most of the villages around Heathrow to pride the space it needs .
That runway would actually extend from Barcelona in Spain to Moscow in Russia. That's an enormous distance, even for a straight road (or in this case runway).
I was talking more about the runway from the actual movie. The FnF Crew could've easily gotten where they wanted to go if that runway was pointed somewhere else and placed with one end on a coast. There's even a Forza game, Forza Horizon Presents Fast & Furious, that has an achievement for completing it's final mission. That achievement is titled "How long was that runway?" as a reference to the jokes about it's calculated length.
I can imagine a collab video of Wendover Productions and Real Engineering talking during 35 minutes about plane engines designs. And I would totally see that thing!!
Circular runways. 13:25 “These are the kinds of issues that come about only after engineers carefully analyze the design” I don’t think it takes much thought to shoot that one down.
When you have seen some of the crap engineers come up with.. Or have to explain to one how a siphon works... Then you'll understand why an engineer would actually design a circular runway and think it would work.
Well... The circular runway is not as crazy as it initially looks. For instance, there'd be no such thing as a crosswind, you'd always land and takeoff with a headwind. A variable wind direction would of course still be challenging. The biggest downside of course is the footprint, to make the idea realistic, you'd need a truly enormous runway, like 8-10 km diameter. So that means up to 4 times the footprint for just 2 runways. Perhaps you could make up for that by having a second inner - ring runway for domestic/shorter flights, but it would be still a crazy large airport, very wasteful of space.
I've been into aviation since roughly 2. Trying to learn as much as I can. I'm now 33 and I've never thought of all the things considered into the making of an efficient airport and it's runways. This single video puts so many pieces of the puzzle together. Outstanding. I learned So much!
None of the 3 runways at my airport have planes parked on one of them. But for a few months, 2 of the runways were going under restoration every once in a while. The primary runway got struck by lightning twice In the same month
13:30 Some four year old child designing a runway: 'This circle runway will be great! I can't see any problems at all! ' Real Engineering: 'These are the kinds of issues only found when engineers carefully analyse problems...' Real Engineering viewer: 🤔🤔🤔 seems legit.
Check your facts about the balanced field length. It simply means that TODA, Take Off Distance Available equals ASDA, Accelerate Stop Distance Available. Take Off Distance, TOD, is the distance required to accelerate, lose an engine one second before V1 and then continue the take off to a height of 35 feet above the end of the TODA. Accelerate Stop Distance, ASD, is the distance required to accelerate to V1 and then stop again.
Related to this, the amount of time to stop is not related to the amount of time to accelerate to that velocity, since the engines accelerate you, but the brakes are what stop you (plus the engines in reverse mode potentially). Those numbers have no need to be (and won't be) exactly equal.
I always love flying through Atlanta. With those five parallel runways, other airplanes taking off and landing left and right of you. It's like jet speed drag race.
it's insanely effective indeed, as a commercial pilot I always feel when the spoilers go up, especially whith a smooth landing because they're set to deploy as soon as the ground sensor ... well... senses we are on the ground (that there is pressure on the wheel) and that the wheel is spinning. It's mainly used to increase effectiveness of the brakes, otherwise the wheels would skid too easily (some runway excursions occured only because the spoilers weren't armed and deployed)
This video was really amazing! There's actually another consideration that you could include in your runway length calculation regarding the balanced field length. I've never actually heard of that term before, quite possibly because most aircraft do not require the same amount of distance to decelerate from V1 to stop as they do to accelerate from start to V1 (or possibly because I live in Canada, not Europe). This is because an aircraft uses its engines to generate the accelerating force while it uses its brakes to generate the decelerating force. In all cases I can think of, an aircraft's braking system is actually capable of generating a greater force than its engines are, meaning the distance required to stop is less than the distance required to take off. Although larger aircraft also have reverse thrust systems capable of contributing to a decelerating force, pilots are not allowed to factor reverse thrust into their V1 calculation because not all conditions will permit using reverse thrust, primarily contaminated runways (This may not be the case everywhere, as not everywhere gets as much snow as Canada, I'm only speaking from my experience). This means in the case of an uncontaminated runway there is a bit of extra margin of error and it also simplifies the calculation to determine stopping distance. For reference, I am not an engineer, I am a student pilot with approximately 200+ hours, all of which are in a C172. Assuming a standard atmosphere (29.92 in-Hg, 15 degrees Celsius, sea level, no wind (sorry for the mixed metric/imperial, blame Canada)), a C172S model has a start to wheels-off distance of 960 feet, while it has a rated wheels-down to stop distance of only 575 feet. This isn't the EXACT same as a V1 calculation, but the theory still applies. For larger aircraft, the difference between the accelerate distance and the decelerate distance is usually larger. This means you can make your V1 decision point a bit further down than half the runway, allowing airports to get away with operating larger aircraft on shorter runways. Let me just reiterate that I loved this video and I mean you no disrespect, I just know you'll find this /half as interesting/ as I do!
before v1 it is optional to RTO but after v1 It is a MUST to NOT ABORT takeoff and after 80 knots only serious issues like Engine failure Wind shears and flight control malfunctions can RTO while light issues like blown tires have to Continue with takes off
In my opinion, this channel is really underrated. All of the videos on this channel are incredibly interesting and it makes me want to watch even more. Keep up the amazing work!
As a student pilot who recently gave all his exams, I can confirm, this is the most accurate of all that contain aviation related information or equations, really impressive!
Balanced field length is NOT twice the distance to accelerate to V1. Balanced field length is, in simplified terms, the distance to accelerate to just before V1, lose an engine and stop or equally, continue the takeoff and climb to 35 feet, either option requiring the same distance because that is how V1 is defined. That distance is the balanced field length. It has nothing whatsoever to do with being twice the distance to reach V1.
Thank you!! I was looking frantically for a response like this, everyone is complaining about a380 not being the largest a/c, but nobody mentioned this... In very simple terms the balanced field has nothing to do with the distance, but with the speeds; From 0 to v1 to 0 (your stopping distance) and from 0 to v1 to “liftoff” (your go distance). When they both have the same distance, it is called balance field. For some perspective, if from 0 to v1 is like “1000m” you can expect v1 to 0 or v1 to liftoff to be “500m”, it is for sure a big amount shorter then reaching the v1, so the distances are never the same :)
I was wondering, “it doesn’t take the same distance to stop, it takes more”, but I don’t know. Seems like, even with spoilers deployed, the breaks could nowhere near top the thrust of the two, or four engines.
No it's the other way around. It takes less distance to stop than it does to accelerate. The stopping power from the brakes is more than the acceleration power from the engines. This doesn't even account for spoilers (which make the brakes more effective) or thrust reversers.
I must say, I constantly think of this video. It’s easily one of the most fascinating things I’ve ever watched. Anytime I see an airport, or am talking about airplanes/air travel, or anything like that I instantly think of this video and feel like sharing this information with people because it’s so cool. Amazing job
Istanbul New Airport also will have 5 parallel runways once all the phasses completed. Right now, there are 2 parallel runways, which are 4100 m and 3600 m along.
Pretty useless now that Turkey is turning into a radical Islamic dictatorship, it wouldn't take long before no one will go there anymore, just like 2019 Iran
Slight clarification about the effects of a headwind on takeoff: It doesn't reduce the power needed (Well, technically it does but you'll pretty much always take off at full power anyway), but rather the distance required. Take for example a Cessna 172R at sea level with an air temperature of 20 degrees celcius. In calm winds, its ground roll will be around 980 feet and will need about 1745 feet to climb enough to clear a 50 foot obstacle using short field takeoff technique (assuming perfect piloting). now factor in a 9 knot wind; If you take off using the same technique into the wind, those distances reduce to about 882 and 1570 feet, respectively, whereas if you were to take off *with* the wind the distance will increase to a whopping 1421 feet for the ground run and 2530 feet to clear a 50 foot obstacle!
Great job at boiling down the complicated world of airfield design. I will be using this for the foreseeable future to help explain exactly what my job entails!
@@bskull3232 from what I know, airplanes landing or taking off at high altitude airport will have a special setting to prevent oxygen system from activating on ground.
I am surprised Denver international airport is not mentioned here. It is a relatively young airport, and was built a long ways outside of the city in order to accommodate massive expansion. Currently it has four parallel north/south runways, all at least 3,658m long, and the longest at 4,877m. It also has two east/west parallel runways, both 3,658m in length. The airport is designed to be able to expand to six north/south runways and four east/west runways. Another very neat design feature is that it is possible to taxi between the terminal and each runway without the need to cross other runways, which makes the airport far safer as the risk of runway incursions is significantly reduced.
Paul Furey I believe the registration of the aircraft has no impact on the regulations that the airport has to comply with. FAA is the American aviation authority. In Europe we have EASA regulations to comply with.
Dublin Airport seems to have become much more efficient in recent years. It takes barely any time to get through security in comparison to many other airports I’ve been in.
Incredible video! Informative! Physics is considered the most vital of building an airport. Lacking the calculations of the temp., airplane crash. Neglect wind resistance, crash.
Commentcritic36 fly the 737-800 I prefer not to state airline. I’ve just realised that I said above v1... I was meant to say above 80 knots. What an idiot?! Haha
Just to let you know - you referred to FAA guidelines when talking about Heathrow, as Heathrow resides within territory of the United Kingdom you should refer to CAA guidelines.
Los Angelas, Miami, New York, DC. We all have those plane problems but we are grateful not complaining about have accessibility to travel 🧳 and making your city a world city!
They both play a HUGE role in day-to-day flying. The difference in performance from low altitude airports, to high altitude airports is massive. Same with cold temperatures vs hot temperatures.
Its the same in sports. Denver or other high altitude fields have massive advantages. For example, the ball can be thrown further, and in soccer, in South America, the national team of Bolivia play at 3,637 metres (11,932 ft) above sea level, making it one of the highest football stadiums in the world. Many visiting teams protest that the altitude gives Bolivia an unfair advantage against opponents. Same would apply to every other aspect, including aviation.
MrCheddahcheese correct, and to get to La Paz you need to fly to El Alto airport, which is in a neighboring city even higher than La Paz itself, at 4.061m (13.323ft). I’ve been there a couple times and always had a mild headache because of the altitude.
@@MrCheddahcheese Actually high altitude airport are at a massive disadvantage. For takeoff, the thinner air reduces both engine thrust performance as well as wing lift and control surface effectiveness. For landings, the same final approach speed is actually faster due to the change in pressure /density, known as ‘true airspeed’. So an indicated speed of 130 knots at sea level is 130 knots, at 5000’ elevation an indicated speed of 130 knots could be 150 knots or more of true airspeed. This results in longer landing distances to bleed off the speed and braking energy.
The pandemic has certainly affected the need for a Third Runway, as it has for the need for the HS2. Hopefully, movement restrictions will continue to reduce the need for interconnecting infrastructures like additional Motorways.
I was at Phoenix Sky Harbor during the runway closures in 2017 due to the excessive heat. In addition to the runway closures, aircraft were having trouble cooling the cabins of their planes in the heat. Surface temperatures (including heat reflectivity off of the tarmac) were reaching 60*C. I was able to book a flight out of Tucson to DFW and had time to make the 2 hour drive there and get through security, board and take off before the runways reopened at Sky Harbor that evening.
I remember how popular the circular runway was for a long time. People were going “it’s the future” (cnn, Fox, etc) and no one even considered how much of a pain it would be. Thanks for not siding with designers. Engineer gang for life
Headwind doesn't reduce the power needed for a proper takeoff roll, but does reduce takeoff distance. The engines still need the same power to propel the aircraft through the air. Airspeed vs groundspeed.
Kiimosabe actually, most airliners will try to use the least engine power for the runway available. When the headwind is stronger, the engine can be set to a lower power setting.
Circular runways. 13:25 “These are the kinds of issues that come about only after engineers carefully analyze the design” I don’t think it takes much thought to shoot that one down.
@@arcaipekyun4232 i think they give the fighter planes on aircarft carrier, a bonus head start speed since the runway is short there? something like pressurized hydrualics maybe
shahmeer khan yup. It uses pneumatics. Pressurized air. The aircraft is held by a piece connected to that system. The air is released and the aircraft speeds up like lightning. It actually reaches 220 kph at the end of the runway
Similar thing in Dallas, TX at their DFW airport. 5 North-South runways used daily simultaneously (2 Take-off and 3 Landing,) and 2 angled ones only used when needed for winds usually. The predominant wind in Dallas, TX is a southerly flow from either the Gulf of Mexico or "Actual" Mexico from the south. Most Gulf-Coast or nearby inland airports have an option to land N-S.
Interesting about the headwind idea. My local airports IAH and HOU have runways to operate E/W or N/S. The airports normally run E/W but when there is a large storm system in the Gulf of Mexico the wind shifts to N/S and the other runways are used!
I pass by LAX many times a week for work. Planes usually land facing west (landing over the 405), but occasionally they have to switch (taking off over the 405). It feels like Opposite Day when that happens.
DIA or Denver international, has a very unique design. I think its also the largest air by sq ft in North America but im not sure. Its also a very mysterious as its runways might look like a swastika but also a windmill. I think a vid on DIA would be interesting.
MegaMGstudios A weaponized satellite technology that shoot a projectile weapon, which it is roughly the size of a telephone pole. Thus, the projectile travel roughly 11.2 km/s towards the target within 15 minutes.
The problem with circular runways is the weather? That's why the plane can always be facing the wind? There are bigger problems than that in the concept, but not that one.
The problem is that you will always have a force acting sideways on the aircraft due to the slope and curvature of the runway. Increases airframe stress and probably accidents too
@@asdfasdgfasd I feel like another issue is getting the glide slope just right, if you are slightly too low, you have got to go around and if you are too high you have got to start circling with the runway.
Another wonderful and educational video. I've loved seeing your animation skills continue to blossom. That time on Skillshare is paying off :) Keep up the hard work!
[5] how does it make sense😂? Even though they are switching runways but the direction is still the same as before as planes as still taking off from the west and landing from the east
So residents have relief from the noise. A plan is much louder when taking off since it's engines are throttling up. Engines are quieter as it lands since it is throttling doen
I know this isn't a recent video. But I recently learned about engineered materials arresting systems. You absolutely need a video about that and how it works because it's pretty fucking amazing. I had no clue it was there.
13:17 "like this circular runway design, which would not only be a nightmare for ATCs (...), but would also only be useful in calm weather with no wind dictating takeoff direction."
Hadinos Sanosam Skipped that. But true, he mentions it. Why such a short comment about it though? Why would it be a nightmare for the controllers? Wind speed and direction is measurable. The idea is to always land and start against the wind and circular runways makes that possible. What am I missing? ADDED: Hasn't done the math but a big enough radius of the runway ===> the angle of the tilt should not be an issue
I don't get why it would be an issue for atc. Shouldnt actually be easier to control? Couldn't you just let the planes hold in two descending spirals using two different parts of the runway? From the top it would look like three circles with the airport in the middle.
a lot of people who complain about runway noise moved there knowing the airport was nearby. You'd have to be pretty dumb to buy cheap because it's under the flight path, then complain about the noise.
It's like people who buy properties in entertainment or sporting districts. Then complain about the noise form the bars or the traffic from the football games. Well duh
That assumes that they actually had a choice, but with housing costs on the rise that's less and less the case. After all, if it's the only affordable housing, than there is no real choice.
MyTech, no but it is an actual number defined by the flight regulatory body of the nation in question of which the FAA holds no sway and so our eggheads set different rules.
Those distances are certainly excessive for something dictated by physics alone. I mean, given sufficiently skilled pilots and a sufficiently wide runway, you could land two planes on the SAME runway at the same time... It would be stupidly risky, but there's nothing inherently stopping you. No, separation distances are conservative best guesses as to how far apart two parallel aircraft would need to be to not be too likely to cause an accident. That's not to say there are no physics related considerations of course - wake turbulence for one, which could be a problem if one aircraft is slightly behind another if they're too close. (Especially if one aircraft is a lot smaller than the other...) But still... It's only kind of related to the physics of flight...
better idea : a circular and INCLINED TOWARD THE CENTER runway: now the pilot doesn't have to turn, just to land with a 45° angle i am a genius, WHERE IS MAY NOBEL PRIZE ? XD
The headwind doesn´t reduce the power needed for takeoff. Pilots apply "take-off power", which is usually "full throtle". The headwind reduces the ground-speed and takeoff and landing distance.
I think another good idea to make runways in some airports better is to use porous asphalt, especially in places that flood like crazy. Just today, a flight from Dubai to Kochi Airport in India had skidded off the runway after landing and crashed due to extreme rainfall. The plane unfortunately split into two and rescue teams are still trying to see if there are any survivors. The feasibility of implementing it might be tricky, but I think it would help in the long run.
You may have noticed little numbers popping onto screen throughout the video. These are referring to references in the description of the video. This was inspired by my friend, Simon Clark. Specifically this video: th-cam.com/video/xYTvMWtmdnE/w-d-xo.html Props go to him for the clever technique.
I really like the initiative! References should be commonplace for any informative content
You should look at Boston's Logan International Airport. It is formally one of the busiest airports but has lost popularity primarily because it defies all the things you talked about in this video.
Some airports like LFSB have runoff areas which are used as taxiways but could be used as a shit-the-pants extra room.
References are essential!
Real Engineering I just have to say, if you buy a house next to an airport and then moan about the noise then you're an idiot, and I don't see why they don't bulldoze most of the villages around Heathrow to pride the space it needs .
Fast and Furious Style
30 km long runway
That runway would actually extend from Barcelona in Spain to Moscow in Russia. That's an enormous distance, even for a straight road (or in this case runway).
That Bad BLU Spy I dunno man 30km is about the distance from the statue of liberty to the sandy hook peninsula
I was talking more about the runway from the actual movie. The FnF Crew could've easily gotten where they wanted to go if that runway was pointed somewhere else and placed with one end on a coast. There's even a Forza game, Forza Horizon Presents Fast & Furious, that has an achievement for completing it's final mission. That achievement is titled "How long was that runway?" as a reference to the jokes about it's calculated length.
you could have multiple planes landing at ones at different points/ problem solves.
Where? (Seaplanes still best - Runways 50km+ long)
I can imagine a collab video of Wendover Productions and Real Engineering talking during 35 minutes about plane engines designs.
And I would totally see that thing!!
Icespoon nah 1 hour documentary
YESSSS
1) L O N G
2) F L A T
3 S M Ø Ø T H
5) butter
6) Ryanair Overshoots that long runway
7) inconsistency to add a twist
Nick Dawson 9) No Runways
10) Super expensive
This was bloody brilliant! Thanks for putting so much work into this video dude
No replies?
@@tago3860 wierd to have no replies on a verified channel xD
@@TheTeaLordRBLX ikr lol
@@tago3860 yes no replies
Circular runways. 13:25 “These are the kinds of issues that come about only after engineers carefully analyze the design”
I don’t think it takes much thought to shoot that one down.
If anything, it should be a octagonal runway or a hexogonal one
When you have seen some of the crap engineers come up with..
Or have to explain to one how a siphon works... Then you'll understand why an engineer would actually design a circular runway and think it would work.
@@thebravegallade731 it will create the same problem
Well... The circular runway is not as crazy as it initially looks.
For instance, there'd be no such thing as a crosswind, you'd always land and takeoff with a headwind. A variable wind direction would of course still be challenging.
The biggest downside of course is the footprint, to make the idea realistic, you'd need a truly enormous runway, like 8-10 km diameter. So that means up to 4 times the footprint for just 2 runways. Perhaps you could make up for that by having a second inner - ring runway for domestic/shorter flights, but it would be still a crazy large airport, very wasteful of space.
@@CocoDaPuf try a circular runway in a flight Sim. It is far too dangerous and will never happen.
Your topics always make general issues so interesting which would otherwise be something most of us would be indifferent to. Kudos
I agree
I've been into aviation since roughly 2. Trying to learn as much as I can. I'm now 33 and I've never thought of all the things considered into the making of an efficient airport and it's runways. This single video puts so many pieces of the puzzle together. Outstanding. I learned So much!
9:40 "Let's begin calculations with the world's largest plane: The Airbus A380"
*_Antonov 225 enters chat_*
I think he meant passenger plane
@IBM do U? True that. It would be cool for the Antonov 225 to be able to land at any airport though...
Antonov 225: *Am I a joke to you*
how about stratolauncher
@@amd6474 was about to say that.
2020.... designing the perfect parking lot for planes.
2021... designing the perfect airspace for planes.
Park em, bonus out the board, Chap 11, shuffle leadership, wait 10 yr, rinse and repeat
2022..designing the perfect breathable air deposit for humankind living on capsules..and oh..runways for private jets
None of the 3 runways at my airport have planes parked on one of them. But for a few months, 2 of the runways were going under restoration every once in a while. The primary runway got struck by lightning twice In the same month
Boeing is already good at doing that with their 737MAX fleet
Awesome video and well explained!!
LMAO!
The real!
Hey
Hello
yep
This video: Where Wendover and Real Engineering fans combine :)
OlittoTV too resl
OlittoTV Planes 😘❤
Not gonna lie when I clicked on the video I thought it was a Wendover video judging from the thumbnail xD
RE > > > Bendover Production
Though I watch both of them, RE delivers more.
I was thinking literally the same thing.
Just very well visualized and explained - thank you!
13:30
Some four year old child designing a runway: 'This circle runway will be great! I can't see any problems at all! '
Real Engineering: 'These are the kinds of issues only found when engineers carefully analyse problems...'
Real Engineering viewer: 🤔🤔🤔 seems legit.
Nearly fell out of my chair : "now, Heathrow Airport is a special little butterfly 🦋".. 😂 😂 😂
Maybe my favorite video of yours that you’ve made so far. Incredible job
King Andrew its borrowed
Check your facts about the balanced field length. It simply means that TODA, Take Off Distance Available equals ASDA, Accelerate Stop Distance Available.
Take Off Distance, TOD, is the distance required to accelerate, lose an engine one second before V1 and then continue the take off to a height of 35 feet above the end of the TODA.
Accelerate Stop Distance, ASD, is the distance required to accelerate to V1 and then stop again.
Yup, couple of things went oversimplified in the video.
Related to this, the amount of time to stop is not related to the amount of time to accelerate to that velocity, since the engines accelerate you, but the brakes are what stop you (plus the engines in reverse mode potentially). Those numbers have no need to be (and won't be) exactly equal.
shuldnt it be TODR = ASDR? cuz TODA does not have to equal ASDA
Correct. Also, FYI, reverse thrust is not added into the required stopping distance after a V1 abort.
@@tbmavengerstuka Since Engines could fail leaving no thrust with which to reverse...
i love your videos sooo much, i love just listening to you going through all these different engineering problems, and the animation is amazing!
Real Engineering: “Seeing a flight land beside you is a common sight at LAX”
SFO: Am I a joke to you?
Aviation Center true
Just stfu it was a single example
@@yannickgaensicke509 r/WOOOOOOOOSH
And just because you didn't understand/didn't like the joke doesn't mean you have to tell him to stfu
@@stratis722 so... u cant comment on jokes huh?
+ was a shite normie joke
Yannick Gaensicke No, it is you who are the shitty one
I always love flying through Atlanta. With those five parallel runways, other airplanes taking off and landing left and right of you. It's like jet speed drag race.
8:10 that moment when spoilers are raised how quickly aircraft lost it's lift. I know it's obvious but it's fascinating to see it.
Nice catch! It really demonstrates how much the spoilers... er.. spoil the lift of the plane and allow it to set down
Great catch, thanks for noticing that!
Especially on a plane like that (787?) where the wings flex up as the result of the lift they experience
At this point of landing procedure the spoilers are called lift-dump!
it's insanely effective indeed, as a commercial pilot I always feel when the spoilers go up, especially whith a smooth landing because they're set to deploy as soon as the ground sensor ... well... senses we are on the ground (that there is pressure on the wheel) and that the wheel is spinning. It's mainly used to increase effectiveness of the brakes, otherwise the wheels would skid too easily (some runway excursions occured only because the spoilers weren't armed and deployed)
This video was really amazing! There's actually another consideration that you could include in your runway length calculation regarding the balanced field length.
I've never actually heard of that term before, quite possibly because most aircraft do not require the same amount of distance to decelerate from V1 to stop as they do to accelerate from start to V1 (or possibly because I live in Canada, not Europe). This is because an aircraft uses its engines to generate the accelerating force while it uses its brakes to generate the decelerating force. In all cases I can think of, an aircraft's braking system is actually capable of generating a greater force than its engines are, meaning the distance required to stop is less than the distance required to take off. Although larger aircraft also have reverse thrust systems capable of contributing to a decelerating force, pilots are not allowed to factor reverse thrust into their V1 calculation because not all conditions will permit using reverse thrust, primarily contaminated runways (This may not be the case everywhere, as not everywhere gets as much snow as Canada, I'm only speaking from my experience). This means in the case of an uncontaminated runway there is a bit of extra margin of error and it also simplifies the calculation to determine stopping distance.
For reference, I am not an engineer, I am a student pilot with approximately 200+ hours, all of which are in a C172. Assuming a standard atmosphere (29.92 in-Hg, 15 degrees Celsius, sea level, no wind (sorry for the mixed metric/imperial, blame Canada)), a C172S model has a start to wheels-off distance of 960 feet, while it has a rated wheels-down to stop distance of only 575 feet. This isn't the EXACT same as a V1 calculation, but the theory still applies.
For larger aircraft, the difference between the accelerate distance and the decelerate distance is usually larger. This means you can make your V1 decision point a bit further down than half the runway, allowing airports to get away with operating larger aircraft on shorter runways.
Let me just reiterate that I loved this video and I mean you no disrespect, I just know you'll find this /half as interesting/ as I do!
before v1 it is optional to RTO but after v1 It is a MUST to NOT ABORT takeoff and after 80 knots only serious issues like Engine failure Wind shears and flight control malfunctions can RTO while light issues like blown tires have to Continue with takes off
After V1 its only a must to not abort takeoff, if the aircraft is control- and flyable.
If you lost a wing after V1, you dont have to takeoff
In my opinion, this channel is really underrated. All of the videos on this channel are incredibly interesting and it makes me want to watch even more. Keep up the amazing work!
As a student pilot who recently gave all his exams, I can confirm, this is the most accurate of all that contain aviation related information or equations, really impressive!
Thanks for using the metric system!
Yea, cause aviation does not.
would have preferred the use of knots, but hey.
This is probably the only time he should have used feet and knots...
moral of the story, runways are long and every little factor makes them even longer
Awesome video and well explained!!
Balanced field length is NOT twice the distance to accelerate to V1. Balanced field length is, in simplified terms, the distance to accelerate to just before V1, lose an engine and stop or equally, continue the takeoff and climb to 35 feet, either option requiring the same distance because that is how V1 is defined. That distance is the balanced field length. It has nothing whatsoever to do with being twice the distance to reach V1.
yeap, finally someone who recognized the mistake. well i guess for any non pilot that's a very complicated subject.
Thank you!! I was looking frantically for a response like this, everyone is complaining about a380 not being the largest a/c, but nobody mentioned this...
In very simple terms the balanced field has nothing to do with the distance, but with the speeds;
From 0 to v1 to 0 (your stopping distance) and from 0 to v1 to “liftoff” (your go distance). When they both have the same distance, it is called balance field.
For some perspective, if from 0 to v1 is like “1000m” you can expect v1 to 0 or v1 to liftoff to be “500m”, it is for sure a big amount shorter then reaching the v1, so the distances are never the same :)
I was wondering, “it doesn’t take the same distance to stop, it takes more”, but I don’t know. Seems like, even with spoilers deployed, the breaks could nowhere near top the thrust of the two, or four engines.
No it's the other way around. It takes less distance to stop than it does to accelerate. The stopping power from the brakes is more than the acceleration power from the engines. This doesn't even account for spoilers (which make the brakes more effective) or thrust reversers.
Troy Baxter some fully loaded passenger planes can do 20-100 km/h I’m 5 seconds. Can they really stop that fast?
I must say, I constantly think of this video. It’s easily one of the most fascinating things I’ve ever watched. Anytime I see an airport, or am talking about airplanes/air travel, or anything like that I instantly think of this video and feel like sharing this information with people because it’s so cool. Amazing job
Your aeronautical knowledge is incredible you even had an AC as a source. Fantastic job
6:02
What part of Tatooine is this airport?
Tunisia
Where is my blue milk?
Las Vegas.
cue the Luck Skywalker music!
Uriah Siner the last gaydi
I knew about the v1 vr and v2 speeds but I never knew about vmc, emu, vlof speeds...they are all knew to me. Thanks for telling me anyways!
VS
VSI
V1
VR
V2
VX
VY
VFE
VLO
VNO
VNE
There are so many more.
Istanbul New Airport also will have 5 parallel runways once all the phasses completed. Right now, there are 2 parallel runways, which are 4100 m and 3600 m along.
Pretty useless now that Turkey is turning into a radical Islamic dictatorship, it wouldn't take long before no one will go there anymore, just like 2019 Iran
Slight clarification about the effects of a headwind on takeoff: It doesn't reduce the power needed (Well, technically it does but you'll pretty much always take off at full power anyway), but rather the distance required. Take for example a Cessna 172R at sea level with an air temperature of 20 degrees celcius. In calm winds, its ground roll will be around 980 feet and will need about 1745 feet to climb enough to clear a 50 foot obstacle using short field takeoff technique (assuming perfect piloting). now factor in a 9 knot wind; If you take off using the same technique into the wind, those distances reduce to about 882 and 1570 feet, respectively, whereas if you were to take off *with* the wind the distance will increase to a whopping 1421 feet for the ground run and 2530 feet to clear a 50 foot obstacle!
Great job at boiling down the complicated world of airfield design. I will be using this for the foreseeable future to help explain exactly what my job entails!
Holy crap, from that Tibetan airport, you're pretty much already halfway to your cruising altitude. O_o
And at lower than cruising cabin pressure. I wonder how that will troll the pressurization system.
@@bskull3232 from what I know, airplanes landing or taking off at high altitude airport will have a special setting to prevent oxygen system from activating on ground.
Feels like wendover has infected you with that focus on airplanes
You got it in reverse.
alright then, I guess his just showed up in my recommended earlier.
Great video as always btw!
airplanes are better anyways
Also Mustard.
Nicely done, great video. PS: Love your accent
I second this sentiment. You sound sort of like my brother-in-law.
Very streamlined, suits his channel well.
I am surprised Denver international airport is not mentioned here. It is a relatively young airport, and was built a long ways outside of the city in order to accommodate massive expansion. Currently it has four parallel north/south runways, all at least 3,658m long, and the longest at 4,877m. It also has two east/west parallel runways, both 3,658m in length. The airport is designed to be able to expand to six north/south runways and four east/west runways. Another very neat design feature is that it is possible to taxi between the terminal and each runway without the need to cross other runways, which makes the airport far safer as the risk of runway incursions is significantly reduced.
I’m just stopping by to thank you for your videos. Real Engineering and Wendover are the coolest channels on TH-cam.
I don’t think the FAA has much to say about runway spacing on Heathrow ;)
Maybe for N registered aircraft?
Paul Furey I believe the registration of the aircraft has no impact on the regulations that the airport has to comply with. FAA is the American aviation authority. In Europe we have EASA regulations to comply with.
FAA sets the international standards
@@Hahlen It does not. ICAO does that.
@@Hahlen The world doesn't revolve around the US thankfully as the 737 Max has shown the FAA is corrupt and cannot be trusted.
6:30: Friggin’ Bethesda strikes again.
Dublin Airport seems to have become much more efficient in recent years. It takes barely any time to get through security in comparison to many other airports I’ve been in.
Unlike usa airports. Grass will grow to be higher than a person and the pandemic will be over before you even get through
Incredible video! Informative! Physics is considered the most vital of building an airport. Lacking the calculations of the temp., airplane crash. Neglect wind resistance, crash.
You are like my physics professor in my school years who took us out for a sports day and ended up giving lecture on physics in sports period !!
8:35 above v1, we only reject for engine fire, engine failure, predictive windshear warning, or aircraft is unsafe or unable to fly.
What crazy company/plane do you fly at? That is far from standard
Commentcritic36 fly the 737-800 I prefer not to state airline. I’ve just realised that I said above v1... I was meant to say above 80 knots. What an idiot?! Haha
@@Samjones11203 LoL. Same at my company. :)
Just to let you know - you referred to FAA guidelines when talking about Heathrow, as Heathrow resides within territory of the United Kingdom you should refer to CAA guidelines.
EASA
possibly one of the only videos in metric that I actually wanted in nautical imperial.
The blue plane at 12:29 landed sooo smoothly..its damn satisfying!
Los Angelas, Miami, New York, DC. We all have those plane problems but we are grateful not complaining about have accessibility to travel 🧳 and making your city a world city!
I'd never considered airport altitude or temperature before.
They both play a HUGE role in day-to-day flying. The difference in performance from low altitude airports, to high altitude airports is massive. Same with cold temperatures vs hot temperatures.
Its the same in sports. Denver or other high altitude fields have massive advantages. For example, the ball can be thrown further, and in soccer, in South America, the national team of Bolivia play at 3,637 metres (11,932 ft) above sea level, making it one of the highest football stadiums in the world. Many visiting teams protest that the altitude gives Bolivia an unfair advantage against opponents. Same would apply to every other aspect, including aviation.
MrCheddahcheese correct, and to get to La Paz you need to fly to El Alto airport, which is in a neighboring city even higher than La Paz itself, at 4.061m (13.323ft). I’ve been there a couple times and always had a mild headache because of the altitude.
Some (like Denver - KDEN) are considered "high and hot" airfields which is why it has five runways at 12000ft (3658m) and one at 16000ft (4877m).
@@MrCheddahcheese Actually high altitude airport are at a massive disadvantage. For takeoff, the thinner air reduces both engine thrust performance as well as wing lift and control surface effectiveness. For landings, the same final approach speed is actually faster due to the change in pressure /density, known as ‘true airspeed’. So an indicated speed of 130 knots at sea level is 130 knots, at 5000’ elevation an indicated speed of 130 knots could be 150 knots or more of true airspeed. This results in longer landing distances to bleed off the speed and braking energy.
For a moment I thought this was a video made by wendover production! Thanks for the interesting and informative video.
The pandemic has certainly affected the need for a Third Runway, as it has for the need for the HS2.
Hopefully, movement restrictions will continue to reduce the need for interconnecting infrastructures like additional Motorways.
there's certainly a need to limit aviation's contribution to the climate emergency
I was at Phoenix Sky Harbor during the runway closures in 2017 due to the excessive heat. In addition to the runway closures, aircraft were having trouble cooling the cabins of their planes in the heat. Surface temperatures (including heat reflectivity off of the tarmac) were reaching 60*C. I was able to book a flight out of Tucson to DFW and had time to make the 2 hour drive there and get through security, board and take off before the runways reopened at Sky Harbor that evening.
I remember how popular the circular runway was for a long time. People were going “it’s the future” (cnn, Fox, etc) and no one even considered how much of a pain it would be. Thanks for not siding with designers. Engineer gang for life
Headwind doesn't reduce the power needed for a proper takeoff roll, but does reduce takeoff distance. The engines still need the same power to propel the aircraft through the air. Airspeed vs groundspeed.
Kiimosabe actually, most airliners will try to use the least engine power for the runway available. When the headwind is stronger, the engine can be set to a lower power setting.
0:07
*Last year, over 90% of Ryanair flights arrived on time*
Circular runways. 13:25 “These are the kinds of issues that come about only after engineers carefully analyze the design”
I don’t think it takes much thought to shoot that one down.
The solution is clear as day, aircraft catapults!
"Hello folks, I'll be your pilot today, please wait as we load the trebuchet"
MsSomeonenew those are used in aircraft carriers
@@arcaipekyun4232 i think they give the fighter planes on aircarft carrier, a bonus head start speed since the runway is short there? something like pressurized hydrualics maybe
shahmeer khan yup. It uses pneumatics. Pressurized air. The aircraft is held by a piece connected to that system. The air is released and the aircraft speeds up like lightning. It actually reaches 220 kph at the end of the runway
Looks like rocket boosters are BACK on the table boys..!! :D
came across this video by accident and was hooked from start to finish, very interesting stuff!
Your videos keep getting better and better
Is this wendover productions? ;) Nice vid!
No
Nao
nie
Nein
A380 *Worlds largest passenger plane. Not the largest, that slot goes to the Antanov-225 ;)
Aaron Chislett the new stratosphere launch plane?
@@franchocou That's only the biggest in terms of wingspan.
How about belugaXL
Beluga XL wingspan: 60.3m, Maximum takeoff weight: 227,000kg. AN-225 wingspan: 88.4m, maximum takeoff weight: 640,000kg. Stratolaunch proposed wingspan: 117m, max estimated takeoff weight: 540,000kg.
@@franchocou The Beluga XL is no where near as big as the AN-225...
And then you have Schiphol, three runways north south and the rest all over the place
YYC is north south as well
Yes that is true, but in Calgary the dominant wind is north south, where as the Netherlands has mainly wind from the west.
Similar thing in Dallas, TX at their DFW airport. 5 North-South runways used daily simultaneously (2 Take-off and 3 Landing,) and 2 angled ones only used when needed for winds usually. The predominant wind in Dallas, TX is a southerly flow from either the Gulf of Mexico or "Actual" Mexico from the south. Most Gulf-Coast or nearby inland airports have an option to land N-S.
the far west runway takes so long to taxi from and to ....... youd think after you land you're almost off the plane but nope....
Before ORD began a 'cleanup' procedure the runways were all over the place as well
Interesting about the headwind idea. My local airports IAH and HOU have runways to operate E/W or N/S. The airports normally run E/W but when there is a large storm system in the Gulf of Mexico the wind shifts to N/S and the other runways are used!
How can someone not find this interesting? This is awesome and so interesting
2:39 my guy came outta nowhere might as well just go head first into the runway.
0:39
Me:*sees Dublin airport*
Me:well that's one way to plug your country
a380 is not the largest plane, but commercial airliner
Xeffx Antonov FTW
Good job on nitpicking.
Almost all planes fly commercially even military,though An-225 the biggest aircraft and holds hundreds of records
Sml?
nope. the old H-4 had a bigger wingspan
I pass by LAX many times a week for work. Planes usually land facing west (landing over the 405), but occasionally they have to switch (taking off over the 405). It feels like Opposite Day when that happens.
DIA or Denver international, has a very unique design. I think its also the largest air by sq ft in North America but im not sure. Its also a very mysterious as its runways might look like a swastika but also a windmill. I think a vid on DIA would be interesting.
Nice work and keep it up!!!! Could you do the impossible engineering of Rod of God or ROG?
information to learn what is the Rod of God?
MegaMGstudios A weaponized satellite technology that shoot a projectile weapon, which it is roughly the size of a telephone pole. Thus, the projectile travel roughly 11.2 km/s towards the target within 15 minutes.
information to learn so it's like a nickname/codename for a kinetic impacter?
MegaMGstudios Probably. It's specifically design, in theory, to hit underground bunkers where nuclear bombs can't penetrate.
The problem with circular runways is the weather? That's why the plane can always be facing the wind? There are bigger problems than that in the concept, but not that one.
The problem is that you will always have a force acting sideways on the aircraft due to the slope and curvature of the runway. Increases airframe stress and probably accidents too
@@asdfasdgfasd I feel like another issue is getting the glide slope just right, if you are slightly too low, you have got to go around and if you are too high you have got to start circling with the runway.
@@asdfasdgfasd Actually, you can remove ALL of the sideways stress with proper banking. What you cannot do is remove the effects of the wind.
Real Engineering: Lets take a look and the worlds largest plane.
Antonov: Am I a joke to you?
Well, yes. There's only one and it needs such a large runway that 94% of the world is unreachable to it.
Another wonderful and educational video. I've loved seeing your animation skills continue to blossom. That time on Skillshare is paying off :) Keep up the hard work!
Learning a lot here. this channel and Wendover are taking my time on youtube lately and for good reason. great content. Keep up the good work
2:33 That is a hard landing...
My favourite airport though. Really steep take-off with amazing views. Such an incredibly stupid place to put an airport though
what airport...
London City
id like to see you do better when those pilots most likely had to make their approach steep due to the location of the airport.
Planes usually land a little harder than what would be perfectly smooth to seat the wheels and start braking
I donno but recently I’ve heard the name Heathrow a lot
Its one of the biggest airports on the planet I believe.
@@Martin-yn9be busiest* not biggest
Uhm idk is it just me or did anyone think Heathrow was in Australia?no....
LHR not biggest in size but until recent years was world’s busiest international airport but no longer.😀
That might be because it's one of the most important airports on earth.....
We should just hire you to build our cities.
would take long to do that alone.
Dawn Smith Yes! 👍
But that's a lot of money and paper work for one man to do.
Void He would simply multiply himself with his engineering skills
they'd end up being the most sterile and dullest possible version of cities
That circular airport at the end is straight up nightmare fuel.
better than a mobius airstrip
0:50 That's the Flying Circus in Bealton, Virginia! I used to volunteer there. Great shows every Sunday, May-October.
TARMAC INTENSIFIES
Make a straight concrete strip. There you go.
alright, a 733 with winglets... 👏 👏 👏
I really like the soundtrack for this video!
Brilliant video, I really love the presentation and the way you make everything so simple to understand.
[5] how does it make sense😂? Even though they are switching runways but the direction is still the same as before as planes as still taking off from the west and landing from the east
So residents have relief from the noise. A plan is much louder when taking off since it's engines are throttling up. Engines are quieter as it lands since it is throttling doen
Well if you’d listen to the fuckin video you idiot he explains it literally right after
4 Critical Speed for me, 80Knots, V1, Vr, V2
Cessna?
LoganThe Llama then it would be another type of V speed
You said your stall speed was 80 knots so I was asking if you flew a Cessna by any chance.
LoganThe Llama defiantly no, I meant the CALL OUT, 80 knots, V1, Rotate, V2
My bad, I thought you were stating that as your stall speed.
Mobius loop runways!...………………………..Once we solve the Anti-Grav thing.
One of the best 'knowledge/educational' videos I have ever watched!
I know this isn't a recent video. But I recently learned about engineered materials arresting systems. You absolutely need a video about that and how it works because it's pretty fucking amazing. I had no clue it was there.
What do you think about the future of circular run ways?
To paraphrase what he implied in the video: "No."
Hadinos Sanosam Sorry, missed that. At what time?
13:17 "like this circular runway design, which would not only be a nightmare for ATCs (...), but would also only be useful in calm weather with no wind dictating takeoff direction."
Hadinos Sanosam Skipped that. But true, he mentions it. Why such a short comment about it though? Why would it be a nightmare for the controllers? Wind speed and direction is measurable. The idea is to always land and start against the wind and circular runways makes that possible. What am I missing?
ADDED: Hasn't done the math but a big enough radius of the runway ===> the angle of the tilt should not be an issue
I don't get why it would be an issue for atc. Shouldnt actually be easier to control? Couldn't you just let the planes hold in two descending spirals using two different parts of the runway? From the top it would look like three circles with the airport in the middle.
I sort of miss the days when your thumbnails where all blue and white. I am not saying your videos have gotten worse, but full blueprint was cool
2:41 "nut"
2:58 "all over the UK"
Phenomenal video. Better than TV.
Bravo. Encore.
an aviation-themed video with only 2.7% dislikes? what a time to be alive
Because he uses the metric system
a lot of people who complain about runway noise moved there knowing the airport was nearby. You'd have to be pretty dumb to buy cheap because it's under the flight path, then complain about the noise.
It's like people who buy properties in entertainment or sporting districts. Then complain about the noise form the bars or the traffic from the football games. Well duh
You can complain, you just can’t get mad about it.
That assumes that they actually had a choice, but with housing costs on the rise that's less and less the case. After all, if it's the only affordable housing, than there is no real choice.
London Heathrow is not under FAA rules.
That doesn't change the physics of flight. Runway separation is not some arbitrary bureaucratic mandate.
MyTech, no but it is an actual number defined by the flight regulatory body of the nation in question of which the FAA holds no sway and so our eggheads set different rules.
ICAO right? Glad somebody said something!
Those distances are certainly excessive for something dictated by physics alone.
I mean, given sufficiently skilled pilots and a sufficiently wide runway, you could land two planes on the SAME runway at the same time...
It would be stupidly risky, but there's nothing inherently stopping you.
No, separation distances are conservative best guesses as to how far apart two parallel aircraft would need to be to not be too likely to cause an accident.
That's not to say there are no physics related considerations of course - wake turbulence for one, which could be a problem if one aircraft is slightly behind another if they're too close.
(Especially if one aircraft is a lot smaller than the other...)
But still... It's only kind of related to the physics of flight...
But I do believe the ICAO has similar enough rules to warrant using EGLL as an example.
I'm not even an engineer and I can think of several reasons why a circular runway would probably be a bad idea.....
better idea : a circular and INCLINED TOWARD THE CENTER runway: now the pilot doesn't have to turn, just to land with a 45° angle
i am a genius, WHERE IS MAY NOBEL PRIZE ? XD
The headwind doesn´t reduce the power needed for takeoff. Pilots apply "take-off power", which is usually "full throtle". The headwind reduces the ground-speed and takeoff and landing distance.
I think another good idea to make runways in some airports better is to use porous asphalt, especially in places that flood like crazy. Just today, a flight from Dubai to Kochi Airport in India had skidded off the runway after landing and crashed due to extreme rainfall. The plane unfortunately split into two and rescue teams are still trying to see if there are any survivors. The feasibility of implementing it might be tricky, but I think it would help in the long run.
It's not kochi , it's kozhikode dude
Kochi has India's 8th longest runways and is 7th largest airport.