Why Fighter Jets Can Be Too Unstable

Real Engineering
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Writer/Narrator: Brian McManus
Editor: Stephanie Sammann (www.stephanie-sammann.com/)
Animator: Mike Ridolfi (www.moboxgraphics.com/)
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Thumbnail: Simon Buckmaster twitter.com/forgottentowel


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Real Engineering
Real Engineering महीने पहले
Notebooks are available here. Feels cool to create merch that is actually useful. standard.tv/re-notebook
Zbigniew Modrzejewski
Zbigniew Modrzejewski 17 दिन पहले
The Future of Flight : quantumantigravity.wordpress.com/
015A 18 दिन पहले
hi i'm in my freshman year of high school now i would have bought and contributed to the sale of the note books but unfortunately i only use and need binder paper but i'm gonna buy it because i'm taking industry technology classes and auto cad and solid works sucks for making a simple idea drawing of something that might not work so i'm gonna beg my parents to get me another note book and only this one so i can make simple drawings to just get the basics of what i want to use
James Metz
James Metz 21 दिन पहले
Thanks so much for these notebooks, I needed some for school this semester but was disappointed by similar versions, if you keep these in stock that would be amazing
Nxdav 22 दिन पहले
Literally bought one the second I saw it.. this is gonna be really helpful! Thank you!!
Seimen Veldt
Seimen Veldt 24 दिन पहले
What kind of grid is it? We EU students need 1cm grid notebooks..
Phillip Keane
Phillip Keane 2 दिन पहले
They're not "too unstable". You're talking like this is an accident of design. They're exactly as unstable as they need to be.
lr21643 2 दिन पहले
Pretty sure the c.g. of that Cessna at around 3:20 would actually be much further aft. If memory and the internet serve, the datum on a C-172 is the firewall, and the c.g. is supposed to be between 3 and 4 feet behind that. Furthermore, the term center of lift can be misleading, at least as usually used. It's probably ok if you're just taking off or cruising around. However, consider a plane in a vertical dive. The wing, in most cases, is still trying to pitch the aircraft "down". For the center of lift to do that, it would have to be infinitely far away. The horizontal stabilizer doesn't actually have to push down, depending on how the airplane is loaded, the size of the horizontal stab, and how far back it is. On certain indoor model airplanes, like EZB's, you can sometimes see the lift of the tail bend the tailboom up. If you don't know what an EZB is, check this out: in-vid.net/video/%E0%A4%B5%E0%A5%80%E0%A4%A1%E0%A4%BF%E0%A4%AF%E0%A5%8B-3cLJQz10bNk.html Notice how large and far back the horizontal stabilizer is. The c.g. on a model like this may be behind the trailing edge of the wing.
lr21643 2 दिन पहले
BTW, downwash effects on the tail REDUCE pitch stability. Consider that, in level flight, the plane has to have lift equal to the weight. At high speeds, a lot of air is going past the wing, so, in order to get enough lift, it only has to direct that air down a little bit. At lower speeds, that air has to be directed down at a greater angle and velocity. So the downwash varies oppositely to what you'd like. Fortunately, the dominant effect is the changing angles of attack of the horizontal stab and the wing. But I don't really have the energy to explain that now. Probably most aircraft aerodynamics textbooks would explain it.
FPV Stealth rc
FPV Stealth rc 4 दिन पहले
Thank you very much for your sharing I have subscribed excellent videos sub 2M
Chris Sanchez
Chris Sanchez 6 दिन पहले
After finding out you made notebooks, I immediately bought one and I love it! It’s a perfect size for travel and made exceptionally! The moleskin, bookmark, and the elastic band are good touches too.
Daniel Kron
Daniel Kron 9 दिन पहले
Apparently there is no planes in the world. Only in US
Damion Richter
Damion Richter 9 दिन पहले
Rzr2ffe 9 दिन पहले
Your center of gravity for the Cessna is too far forward
Meister Kaos
Meister Kaos 11 दिन पहले
It's because fighter jets don't talk about their emotional problems with their peers until it's too late, and one day they just drop out of the sky.
Zemani 11 दिन पहले
Future engineers where u at?
Anders Backman
Anders Backman 12 दिन पहले
Are the graph paper millimeter / 5 mm / 1 cm or some weird US / British grid?
shubham temak
shubham temak 12 दिन पहले
I'm doing aircraft maintenance engineering and I cleared aerodynamics exam ur vid helped thx
Tanner Denny
Tanner Denny 12 दिन पहले
Knocked up by a gust of wind... isn’t that how Jesus got made borned?
David Niegowski
David Niegowski 13 दिन पहले
Hey Brian, I’m making a jet engine for one of my engineering classes and I realized I might be a bit overambitious, but I’m committed. Would it be possible to DM you some simple questions on twitter occasionally?
Kate Russell
Kate Russell 13 दिन पहले
So is this why the new 737 aircraft pitch differently because the engines are located more up and forward?
Real Engineering
Real Engineering 13 दिन पहले
Kingdom of Osea
Kingdom of Osea 15 दिन पहले
Yoda Yoda
Yoda Yoda 16 दिन पहले
Funny fact. I learned all of this via kerbal space program
Jayakrishna Balaji
Jayakrishna Balaji 16 दिन पहले
Can you please take time explain about the #B737-Max8 air crash in light with MCAS?
Zbigniew Modrzejewski
Zbigniew Modrzejewski 17 दिन पहले
The Future of Flight : quantumantigravity.wordpress.com/
Julio 18 दिन पहले
Cameron Harper
Cameron Harper 19 दिन पहले
Can you stop posting porn for Wendover Production???
MrManiac3 20 दिन पहले
Below. Oh. Oh.
Miami Kasabian
Miami Kasabian 20 दिन पहले
Best you've done yet, you should be lecturing stability! It only took me three months of flight mechanics to still not really get it ...
Jordan Teo
Jordan Teo 21 दिन पहले
sorry, this may be too much from me to ask but could you go over the superbottle and electric motors from tesla? or how electric aircraft may happen in the future
Jordan Teo
Jordan Teo 20 दिन पहले
love the dedication and simple animations w/ explanations
Jordan Teo
Jordan Teo 20 दिन पहले
also, how can tesla shink the amount of wiring needed from a couple thousand meters of wiring to couple hundred?
Jordan Teo
Jordan Teo 20 दिन पहले
there was a recent discussion with Sandy Munro from Munro & associates inc. (in-vid.net/video/%E0%A4%B5%E0%A5%80%E0%A4%A1%E0%A4%BF%E0%A4%AF%E0%A5%8B-i93VJ1PEp6o.html 47:50) he shares some things many being important when considering tesla's future, one of them was the superbottle. I was very intrigued by how one small thing can be a substitute (or combining. I'm not how it fits in the whole system) three major (cooling and heating) systems
Dev Shah
Dev Shah 21 दिन पहले
Make a video on the future of NANO MATERIALS
Luis 21 दिन पहले
Very interesting explanation about horizontal stabilizers. What about a delta wing? How does that works? Could you make a video about it?
Real Engineering
Real Engineering 21 दिन पहले
Yeap, I plan to!
Frank Nakamo
Frank Nakamo 22 दिन पहले
Airplanes can not scientifically fly, they using telekinesis to make airplanes lift, airplanes all are too heavy and not capable of self sustaining in air.
Yves Cartieaux
Yves Cartieaux 22 दिन पहले
Nice pictures but too many inaccuracies, it is not relevant to speak about stability without speaking of neutral point. Stability is not directly linked to the empennage type : aircraft with canard could be stable or unstable…. and what about tailless configuration (F-106, Mirage 2000...) ? This documentary is definitely not something to show for stability explanation.
Andrew Egan
Andrew Egan 22 दिन पहले
Congrats on two mil
Colin Woodall
Colin Woodall 22 दिन पहले
I didn't like what was available so I made my own - engineer's motto? lol
Mark Zaikov
Mark Zaikov 22 दिन पहले
5:00 AM binge watching science.
SillieWous 22 दिन पहले
Something is either stable or unstable. It may be difficult to control, but it is either of the two not in between.
InDieTasten Development
InDieTasten Development 22 दिन पहले
I have a question regarding 5:50. Angle of attack is the angle of the surface against the current direction of travel. If the plane pitches down, it will also descend, so the direction of travel goes down as well. In the animation, the angle the wing surface against an arbitrary horizontal line. So how does this work exactly? In the previous example of downwash, it was explained, that the difference is caused by speed of travel, which makes sense for the same reason, that the second example with the wing outside the wash doesn't make sense. What part am I missing?
burningSHADOW42 22 दिन पहले
How does the Eurofighter fit into all of this. To my knowledge it is designed to be extremely unstable. I heard at some point that the aerodynamically stable position for a Eurofighter is upside down.
Karel Kédl
Karel Kédl 23 दिन पहले
I think you should break this topic down to elements and explain all about stability and mention both static and dynamic stability. Because you are mixing these two together here.
DFX2KX 23 दिन पहले
Anyone who thinks 'the more unstable the better needs to get X-plane (any version), and try making a dynamically unstable aircraft that's actually flyable. getting the control curves dialed in right is hard enough when the plane is only *mildly* fidgety. There's a demo aircraft in version 10 called 'Deathtrap' it's a flying wing with forward sweep. How the hell it flies as good as it does, I don't know, but it'll end up going backwards if you so much as look at it funny.
DFX2KX 23 दिन पहले
I say X-plane because the tool to do this comes with the game/sim. Plane Maker
K G 23 दिन पहले
I like turtles
DumbledoreMcCracken 23 दिन पहले
I don't like these videos. If the audience is lay, then I think they don't really know what the words mean. The audience of authorities wouldn't be informed?
anka 098
anka 098 23 दिन पहले
that channel made me realize that I love engineering, my collage did the opposite.
anka 098
anka 098 21 दिन पहले
@X-ray Scott they dont give us answers for our basic simple questions .. most doctors treat thier students like these stupids will never understand im just gonna give them some exams and they should memorise whatever is written in the note.. so that students study for the exam and delete evry thing they studied after exams.. also the practical side is ignored in my college and that is the sadiest thing .. that was in my first and seconed year .. after that i realized that its all about self teaching ..
X-ray Scott
X-ray Scott 21 दिन पहले
What did you make a collage of that made you hate engineering?
anka 098
anka 098 23 दिन पहले
watching this for enhancing my planes in KSP :^
Fully_Retractable 23 दिन पहले
Came here for the educational value, and left with a notebook, as soon as you said it was graph paper, I was sold!
Ocotillodavid 23 दिन पहले
Too many self-certified experts. The post is a big YAWN!
Y Tho
Y Tho 23 दिन पहले
2/5 of those comments were pretty obviously jokes. like, "involuntary hypermobility" clearly isn't a good thing, because it's "involuntary", and the first one read like a joke as well. you should use skillshare to learn how to pick examples that better support your argument using their course on writing an effective essay.
Isaac L-L
Isaac L-L 23 दिन पहले
Important note about why the cG is so far back for the X-29. Jets have a lot of weight in the back because of where the engine is (same reason that your C172 has its cG far up), and therefore you can get the wings further back.
DexMaster881 24 दिन पहले
Meanwhile In Soviet Russia: Physics.exe has been paused on demand by Commrade Stalin
Ty White
Ty White 24 दिन पहले
The lines at 3:40 gave me a big "AHHA" moment. I have wondered before how the relatively small elevators in the back could be able to adjust the pitch of the wings, when the wings are so much larger. It seems the larger wings would deflect more air than the smaller elevator, and over power the elevator. I see now the elevators can control the pitch because of greater leverage in relation to the center of gravity :) hope everything I said is logical.
KerazyJoe 24 दिन पहले
If the The Den was still on, you would have done a feature.
Ben Knisley
Ben Knisley 24 दिन पहले
Yo selling moleskine style notebook for your channel is brilliant!
deldote 24 दिन पहले
I'm sorry dude, but you got this one wrong, or at least you oversimplified the explanation to the point where it does not give the right message. I am both a physicist and a glider pilot, and I spent a lot of time trying to make sense of the stability of airplanes, since the way I was taught it in flight school (which was sort of similar to what you say in this video) did not make sense to me. In your explanation, you give the impression that the instability comes from the canards being in front of the CoM. This is not the case, as one can make perfectly stable planes with canards. One can even make planes with two 'main' wings. The 'standard' explanation about the changing AoA on the tailplane does not really work, since changes in pitch affect the AoA of both the tailplane and the main wing equally. If the torques are balanced in level flight and we double the AoA so that lift of both the tailplane and the wing will double, the torques will remain perfectly balanced. There is gonna be no restoring torque to provide stability. What makes a plane stable is the difference in AoA between the tailplane and the main wing, this is called 'decalage'. If the back wing has a lower AoA than the front wing in level flight, a change in pitch will relatively affect the back wing more than the front one, so that a net restoring torque is generated. This can be done with canards to. It does not matter if both wings are behind the CoM or if one is in front of it, all that matters is that the back wing has less AoA than the front one. Read chapter 6.1 of this book for a more detailed analysis, for me it was really enlightening www.av8n.com/how/. I hope i don't sound too critical, I just write this because i got stuck with the same problem some time ago and finally managed to get a clear picture. I love your channel, and thank you for making great content!
Gulfam Anjum
Gulfam Anjum 24 दिन पहले
Is not the area of Plan design belongs to the Civil Engineering? I felt in the video some thing mine [architectural].
Gulfam Anjum
Gulfam Anjum 24 दिन पहले
You are blessed with truly clear spoken English style; selection of the words was so simple that I could not feel that the English is not my native language. Thank you very much.
Sotos 25 दिन पहले
Am I the only one who noticed Thessaloniki at 3:50? Happy to see my hometown in one of your videos!
Daniel Bd
Daniel Bd 25 दिन पहले
Can you make a video about Von Braun space station and if now is the right time to build it?
Flikz 25 दिन पहले
Alessandro Esposito
Alessandro Esposito 25 दिन पहले
Love the video. One little note: while talking about the Embraer EMB 120 Hor. Stabilizer it is technically wrong to say that it has a negative “AoA” since AoA is defined with respect to wind flow. But yes, it has a negative geometric angle with respect to it’s body horizontal axis.
4G12 25 दिन पहले
This actually relates very well to automotive handling stability as well. The fastest possible setup in terms of qualifying laptimes is one of mild oversteer overall, but it is more cognitively expensive for most drivers to control and perform consistently than a setup with mild understeer overall which although slower over a single lap, is much easier to perform consistently over the entire length of the race distance. That said, some of the best drivers are so skilled at car control they prefer neutral to mild understeer setups, since their car control is no longer conscious but instead, as instinctive as walking and running.
Nighthawk 25 दिन पहले
"Handles like a dream..." _ssshwooooosh!_ *_cue epic guitar solo_*
Maverick 25 दिन पहले
Great explanation
Rushank Sarade
Rushank Sarade 25 दिन पहले
What would happen if we lose AMAZON RAINFOREST? Can we rebuild the forest again?
Rocketry 1000
Rocketry 1000 25 दिन पहले
I don’t enjoy how Static Stability was used in the place of Positive Stability or the fact that downforce was not explained properly, the camber of the horizontal stability creates downforce in the same manner as a wing creates lift. Side note the CF-18 crash in this video was caused by asymmetric thrust due to the loss of the starboard engine not due to the instability of the aircraft.
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