MIT Monkey Ballers build a plane for Red Bull Flugtag 2016

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  • Опубликовано: 5 сен 2016
  • Red Bull Flugtag is an annual event in which competitors attempt to fly a homemade aircraft off a platform 33 feet in the air. This year, Flugtag came to Boston and the MIT Monkey Ballers entered the competition.
    Video: Melanie Gonick/MIT
    Additional time-lapse footage: MIT Monkey Ballers
    Music sampled from, "Origin I," by Scott Holmes
    freemusicarchive.org/music/Sco...
    creativecommons.org/licenses/...
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Комментарии • 451

  • @foghornleghorn8536
    @foghornleghorn8536 7 лет назад +224

    "And I think most of it is just an excuse for people to make fools out of themselves in front of tens of thousands of people"
    He nailed that part.

    • @mydogwasbrian
      @mydogwasbrian 7 лет назад +5

      Foghorn Leghorn he did. too bad he couldn't nail that control line though

    • @foghornleghorn4197
      @foghornleghorn4197 7 лет назад +1

      Say son! I like your style. I say I like your style!

  • @sirsmith6223
    @sirsmith6223 7 лет назад +150

    MIT educated and they don't know the difference between a glider and an airplane. LMAO

    • @camauedd8042
      @camauedd8042 3 года назад +1

      Makes one wonder about our future.

    • @Knightfire66
      @Knightfire66 3 года назад +1

      because a basic glider is waaay to easy and boring so you make a human powered plane?

    • @bluemystic7501
      @bluemystic7501 2 года назад +2

      Don't get it twisted, they're still smarter than you.

    • @Isopromptyl
      @Isopromptyl 2 года назад

      They aren’t smart asses though.

    • @scottlyttle5586
      @scottlyttle5586 9 месяцев назад

      well, he was a computer science major..

  • @jtuttle11
    @jtuttle11 7 лет назад +331

    WOW, a bunch of M.I.T. engineers got BEATEN by a group of Foam Board Model Airplane designers ! ! ! !

    • @TamponTea
      @TamponTea 3 года назад +23

      Goes to show book smart isn't the best. Hands on learning is the way to go.

    • @ewantheboat
      @ewantheboat 3 года назад +5

      Flite test and rotor riot absolutely crushed it , I'm not an engineer but something went very wrong with their plane

    • @thomasmcdonald5887
      @thomasmcdonald5887 3 года назад +2

      But he was humble . Not bragging like some

    • @kermitbearden7142
      @kermitbearden7142 3 года назад +4

      @@ewantheboat Elevator was full down on launch

    • @ewantheboat
      @ewantheboat 3 года назад

      @@kermitbearden7142 for extra lift perhaps ?

  • @iamthepkmaster
    @iamthepkmaster 7 лет назад +51

    "How many people can say they built their own airplane?" But it's not an airplane

    • @jimmieloop8587
      @jimmieloop8587 Год назад +1

      Just like the fools he talks about, another fool making a fool of himself

    • @truthhunterhawk3932
      @truthhunterhawk3932 11 месяцев назад

      What is it then?

    • @scottlyttle5586
      @scottlyttle5586 9 месяцев назад

      @@truthhunterhawk3932 It's technically a glider.

  • @luizfeitosa8848
    @luizfeitosa8848 3 года назад +8

    The MIT team lost because of human errors, but their glider was by far the most advanced

    • @AvishalomShalit
      @AvishalomShalit Год назад +1

      using carbon-fiber base and 3 d printing techniques to build something that looks futuristic but flies like an army boot is not "advanced" it is "art"

  • @LemberTheMember
    @LemberTheMember 7 лет назад +359

    Hehe and Flitetest won and they are RC Hobby pilots 😂

    • @johnfillups4484
      @johnfillups4484 7 лет назад +16

      They actually have been designing and building planes for years.

    • @dabooge
      @dabooge 7 лет назад +59

      The guy claims that "our team is mostly made up of aerospace engineers" That makes it even more sad that hobbyists spanked them.

    • @MrRajien2
      @MrRajien2 7 лет назад +26

      Haha the flight test guys are more than hobby pilots they live and breath the stuff daily. Plus they make a great product, im happy they won. However look at the lift that plane made on launch! If the tail stayed together they would have gone far.

    • @michaboering1092
      @michaboering1092 7 лет назад

      DJB HSI

    • @LemberTheMember
      @LemberTheMember 7 лет назад +3

      Yeah Flighttest scratchbuilds are always well done

  • @Sojourning_
    @Sojourning_ Год назад +2

    in a world full of difficulties, Red bull makes the way for the few to get out and have some real fun along with the tens of thousands taking part as the spectators, being one in heart mind and soul, all for the joy and fun of it all. Being silly at the right time can be very up lifting to the spirit : This red bull event is just one of those right times.

  • @journeyfms
    @journeyfms 7 лет назад +83

    We are MIT, and we take pride in 13th place.

  • @C-M-E
    @C-M-E 7 лет назад +2

    Twenty four foot wingspan, four foot aileron. You, sir, were doomed to fail.

  • @tztz1949
    @tztz1949 7 лет назад +43

    good experience for MIT dudes. next time more CG calculation and less talking about all your planning.

  • @chadams6242
    @chadams6242 Год назад +1

    “Everything in an airplane is pretty simple. It’s kinda surprisingly simple.”
    Plane fails.

  • @WarriorPoet01
    @WarriorPoet01 3 года назад +20

    This MIT team reminds me of an episode of Big Bang Theory.
    Leonard: “Anyone know how an internal combustion engine works?”
    Guys (in unison): “Yeah! Sure!”
    Leonard: “Anyone know how fix one?”
    All: (mumbling) “No. Nope. Nuh uhhh”
    😂

    • @jasonswiatkowski9127
      @jasonswiatkowski9127 2 года назад +1

      Nailed it! Practical experience beats theory in the real world.

    • @Paiadakine
      @Paiadakine Год назад +1

      Difference between concept and practical is an engineer who builds, tests and tweaks.

  • @TheSoundsage
    @TheSoundsage 5 лет назад +4

    It reminded me of Langley's launch of The Aerodrome from a houseboat on the Potomac in 1903. As a reporter commented, " “It fell like a ton of mortar.” (The Boston Herald suggested that Professor Langley ought to give up airplanes and try submarines”)

  • @raphaellauf7786
    @raphaellauf7786 3 года назад +1

    everybody trash talking MIT rn in the comments, these guys are gonna make it further in life then most of you.

  • @ironhornforge7970
    @ironhornforge7970 4 года назад +13

    Just watched this big lead up just to fail. Lol, MIT

  • @dannyhelms2779
    @dannyhelms2779 7 лет назад +7

    If you had found an RC pilot, you would have flown that machine. When I saw the first part of the video, I said your center of gravity was off. On the day of the actual flight, you had absolutely no airspeed. That's why it went straight down. You would think that someone from MIT would know this.

    • @jeancarton1611
      @jeancarton1611 5 лет назад +1

      im an RC pilot with 25 years experience building and flying, from the moment i saw that thing on the ramp i knew would be a failure!
      angle of attack , elevator negative, not sufficient wingspan, airfoil too thick and so on!! and im not an engineer...

    • @songbird6248
      @songbird6248 5 лет назад +2

      Jean Carton you should know more about the competition. Obviously it’s span limited. Of the problems you listed only one is relevant: the negative elevator angle. If you look up the current world record you’ll see it was basically the same design. That’s optimal for the given constraints. You should understand them before you comment.

    • @gertnood
      @gertnood 5 лет назад +3

      @ Jean Carton
      No you're not an engineer, thank goodness, because all those reasons are baloney.. except for the fact that the full flying stab was in the hard down position but you didn't catch on that the angle was too ridiculous to be intentional did you? It's not by design. Wingspan is irrelevant as long as there is enough area, esp. in these short glides esp. without turning, the airfoil isn't thick, what angle of attack are you referring to other than the elevator knocked out of whack?

  • @45035
    @45035 2 года назад

    Outstanding shipmate. Press on. CV-63 USS Kitty Hawk Jan 1980 to July 1983. Couldn`t of said it better myself.

  • @Heavywall70
    @Heavywall70 7 лет назад +4

    I've seen bathtubs fly further at Flugtag. That was awesome.

  • @sifiso5055
    @sifiso5055 3 года назад

    This is very inspirational🙌 Thank you MIT

  • @yak55x
    @yak55x 7 лет назад +48

    I think US engineers need more hands on experience just building things. Our ENG curriculum are too heavy in theory.

    • @rcrazy2625
      @rcrazy2625 6 лет назад +3

      Finally! A non-idiot post with valid constructive criticism! Not sure why everyone else with no education feels the need to chime in on the gliders aerodynamics that they know nothing about. The problem is lack of breadth in the education. Fortunately for these students, this is one way they gained some of that breadth!

    • @Pandainapandasuit
      @Pandainapandasuit 5 лет назад

      Yea, seems they had the idea down and a near solid build but of course with a FIRST build.. it didn't perform well. Just more training .. as like with an other art or project.

    • @kennethfharkin
      @kennethfharkin 3 года назад +2

      As an engineer I agree with you 100%. It is even worse now with the advent of 3D modeling and 3D printing. You have a generation of new engineers with no idea of how to actually make the things they come up with, meaning machine, mold, cast, stamp, etc. let alone how to dimension and measure anything. Every engineer needs to work with a machinist, assembler, inspector, etc. to learn the realities of how their pipe dreams are realized. Engineers are getting as bad as architects who are famous for making beautiful building designs which are structural nightmares to realize.

    • @kennethfharkin
      @kennethfharkin 3 года назад +1

      @@Pandainapandasuit They changed a critical factor, the Center of Gravity, and did not bother to look how that may impact key areas of the design other than the one item they were trying to address. That deserves a smack with a rolled up newspaper right on the snout.

    • @scottlyttle5586
      @scottlyttle5586 9 месяцев назад +1

      My degree is in "Industrial Technology".. a mix of engineering and manufacturing.. It's a major that I think was perfect for me. As a freshman, I got involved in the SAE Design challenges, and helped build a Formula-style car. Near the end of the semester, as I was taught how to use a milling machine (well, taught enough to make it work and make parts), there were senior mechanical engineers coming in and didn't know how to utilize the machinery. This freshman was teaching seniors on the use of a milling machine.. Now, granted.. I did get my initial help from other senior level engineers that taught me early in college. I later went on to know more about milling machines, CNC machines, Welding, and woodworking.. and did get a bachelors degree from the engineering college I attended. It still helps me almost every day.

  • @LoliLoveJuice
    @LoliLoveJuice 7 лет назад +6

    they said that the other ones just make fools out of themselves but theirs went short than the other ones LMAO

  • @tomasundurraga8248
    @tomasundurraga8248 7 лет назад +4

    I think the message of this video is to accept failure and step forward. To put things in practice and not stay stuck in theory. Then try to make an analysis of why the design didn't worked and how the solve the problem(s). The Wright brothers used the test-fail formula to invent the first successful airplane. Every corporation of aviation or automobile industry are constantly testing their prototypes before launching a new model to the market. For example, in formula 1 race cars engineers do computer simulations, wind tunnel tests and then try the cars in the tracks. This a fundamental part of engineering.
    PS. Sorry for my english.

  • @stanleyhipkiss4690
    @stanleyhipkiss4690 7 лет назад +5

    once in a lifetime thing to do
    he must not have got the memo about it being an annual event ....

  • @mr.k1177
    @mr.k1177 6 лет назад +13

    MIT lost to a high school in Arizona in a under water robot competition. Lol

  • @chanakarnkomthongvijit925
    @chanakarnkomthongvijit925 7 лет назад +2

    Getting in MIT is pretty much my life goal.

  • @MrHansen
    @MrHansen 10 месяцев назад

    Surprised MIT Engineers could not do better. It is not too difficult or uncommon to launch a light weight personal aircraft off a cliff and fly successfully. It is done every weekend near my house by many adventurous flyers.

  • @aravindsankaranaorist
    @aravindsankaranaorist Год назад

    Hahahaa engineers couldn't resist the sweet lure that is a broken machine you designed 😂😂😂

  • @chairmankaga2821
    @chairmankaga2821 Год назад

    I'll bet your parents are proud of your "edutainment". I went to a city college and my design worked just as well as yours.

  • @TayyarePilotuOfficial
    @TayyarePilotuOfficial Год назад

    We also were racing in this comp. We were second and our team full of undegreed boys which only made plastic model planes before

  • @iflystuff1
    @iflystuff1 7 лет назад +27

    So you didnt do well and you cheated?

  • @scottlyttle5586
    @scottlyttle5586 9 месяцев назад

    One of the lessons learned? Redundant and backup systems..

  • @leofangd8501
    @leofangd8501 3 года назад

    1:45 "Our team is mostly aerospace engineers I'm actually the only member who is not"
    shows the funniest clip of a dude swinging up before plummeting to the water. I thought that's the guy who isn't an aerospace engineer. 😂

  • @Osdrz
    @Osdrz 7 лет назад

    Man it's an event where people go out and have a good time! Fools or not it's a good time haha. They were acting like it was a life or death situation.

  • @whatthefunction9140
    @whatthefunction9140 7 лет назад +29

    what cant you get your plane back???

    • @rossclements8874
      @rossclements8874 7 лет назад +6

      red bull destroys them after the event

    • @friedchicken1
      @friedchicken1 7 лет назад +10

      red bull is a heartless monster but yet so delicious

    • @divisionst06
      @divisionst06 6 лет назад +1

      To prevent people from entering the same craft every year.

    • @laiaa9178
      @laiaa9178 5 лет назад

      @@divisionst06 the plane is already destroyed the times they hit water

    • @jean-claudefrancoisbaroudd730
      @jean-claudefrancoisbaroudd730 4 года назад +3

      Like Jared said, other idea is that people don't spend too much money using expensive materials *cough*carbon-fibre*cough* and taking the whole thing seriously. Most people come to see a not-sober dude essentially fall 10m at the wheel of a giant sombrero dressed as a cactus, and RedBull gets that !
      There are also a lot of points given for "style", you're not going to win spectators of Flugtag with a functional design..

  • @bearospaceinsider5250
    @bearospaceinsider5250 7 лет назад +3

    they used an airfoil with a huge amount of reflex, a large chord, and so obviously not enough horiz. stab area to compensate, did they really expect it to fly properly at any CG?

  • @rjj54321
    @rjj54321 7 лет назад +2

    NIce nose dive .I am surprised because According to every Hollywood movies or media in general people from MIT are like mythical beings who can more or less do anything. A simple glider built by mythical creatures from MIT takes a nose dive, i cant believe it

  • @guardianobserver6593
    @guardianobserver6593 7 лет назад +15

    Every serious airplane modeler can build better airplanes than these students.

    • @Pandainapandasuit
      @Pandainapandasuit 5 лет назад

      Doesn't even matter though everyone starts somewhere. They just proved that at least they could gain 1 second of flight and have finished a build. It's not even unfinished... Its been made.. me neither u have a plane. Or even partially built

  • @McGuire2778
    @McGuire2778 7 лет назад +6

    When I saw that plane initially take flight I thought the world record was about to get destroyed. Then the flight controls broke and it nose dived. Lol. Hope you all do it again and without incident. I've never seen any other team actually gain altitude going off the barge like you guys did.

  • @elave16
    @elave16 7 лет назад

    Single point of failure! I want to see that wing design flying!

  • @indranildey7924
    @indranildey7924 2 года назад +1

    Old saying, "whatever glitters is not gold"...

  • @KcarlMarXs
    @KcarlMarXs 7 лет назад +8

    WRECKED BY FLITETEST

  • @mjwmercer
    @mjwmercer 7 лет назад +11

    pin heads didn't know the whole thing is a joke? They built an actual aircraft and couldn't fly??? why not just build a basic hang-glider?

    • @1kalambre
      @1kalambre 3 года назад +3

      Imagine if you will a not being able to get into a school that is highly regarded and you make fun of the folks that do get in.

    • @johnray547
      @johnray547 3 года назад +2

      @@1kalambre you salty

    • @1kalambre
      @1kalambre 3 года назад +1

      @@johnray547 not at all. Just pointing out the obvious.

  • @JJBpilot
    @JJBpilot 3 года назад +8

    The fact that engineers don't understand the concept of Center of Gravity is astounding!
    That looked like a well built plane. But clearly the CG was way too far back!

  • @ccarts2567
    @ccarts2567 2 года назад

    KSP planes 1st lesson. Always make sure your center of lift is at least slightly behind the center of mass.

  • @jordanbramley9606
    @jordanbramley9606 7 лет назад +1

    This is awesome! Exactly why it's my dream to go here

  • @Lycoming320
    @Lycoming320 5 лет назад

    Did the controls to the stabilator fail? When they went off the ramp it was in the full nose down position. The plane never had a chance.

  • @shouzhengshao5687
    @shouzhengshao5687 4 года назад +1

    Have you guys learned a term called “initial velocity” before go to MIT?

  • @WazapianArmy
    @WazapianArmy 7 лет назад +8

    Chill guys it's for fun and to practice there skills

    • @DanFrederiksen
      @DanFrederiksen 7 лет назад +8

      Maybe also practice there grammar :)

  • @jlai4431
    @jlai4431 3 года назад

    cg forward!!!

  • @jacob122590
    @jacob122590 7 лет назад +6

    "Our heads were getting too big...but we're MIT, we're going to keep doing this." ~ego

  • @waynehill2746
    @waynehill2746 7 лет назад +2

    You learn more in failure than in success. Good attempt MIT.

  • @spacewad8745
    @spacewad8745 7 лет назад

    this is what i dream of!

  • @longshot7601
    @longshot7601 7 лет назад

    The FliteTest guys out built and out flew ya.

  • @naturaldivision8779
    @naturaldivision8779 7 лет назад +1

    Insane the amount of work they put into an event where you're not allowed to retrieve your aircraft afterwards, and then of course they were about as aerodynamic as the swancraft when they tried. Seems like they should have got their concepts down better before putting so much work into this, but hey guess sometimes you need to learn the hard way.

  • @rajkishore9330
    @rajkishore9330 3 года назад

    That's why sometimes we should not think too much. 😂😂

  • @sheet-son
    @sheet-son 7 лет назад

    They make that same steel pipe in aluminum. Ridgid aluminum conduit, 1.25" OD

  • @hawaiisidecar
    @hawaiisidecar 3 года назад

    Hey is the root account for Athena still root:drroot?

  • @vibrantalien430
    @vibrantalien430 3 года назад

    3:29 and Red eyes!
    Rest is history

  • @ZicajosProductions
    @ZicajosProductions 7 лет назад +2

    Wow, I wish I have the ability to design aircraft like this for school! MIT seems awesome, and it is one of my Top 3 I want to go to. Aerospace Engineering is not just my interest... it is my passion. Going to this school would really help me out in fulfilling this passion.

    • @adidas4785
      @adidas4785 7 лет назад +1

      no, hobbyist beat these guys at building planes and those guys are called flitetest and it's sad to a bunch of MIT students beat by people with a hobby

    • @Ludix147
      @Ludix147 7 лет назад +1

      The Internet Police Well, they won't be building little gliders later in their job and they aren't trained to do that. the flitetest guys have years of experience.

    • @ZicajosProductions
      @ZicajosProductions 7 лет назад +1

      The Internet Police I love Flitetest! Their Flugtag glider dominated.

  • @richardbutt7095
    @richardbutt7095 7 лет назад

    you need to make a bi wing bloop design slow flight speed with huge lift capabilities

  • @c394830
    @c394830 2 года назад

    This is why MIT is still a school.

  • @tkfore2one918
    @tkfore2one918 7 лет назад

    holy shit. I worked as an airplane mechanic with only on the job training for 3 yrs and could have told you that...

  • @TheMainsource01
    @TheMainsource01 6 лет назад +1

    One of the teachers is getting fired in MIT.

  • @nerys71
    @nerys71 4 года назад

    Why is it against the rules to retrieve your plane? what is the point of that?

  • @alexzanderarmstrong
    @alexzanderarmstrong 7 лет назад

    very good!

  • @EngineeringFun
    @EngineeringFun Год назад

    How could these knuckleheads mess the cg up? Best on what I see, this was probably one of the very best plane in the contest. They should have been given a second chance at the end.

  • @luisr320
    @luisr320 6 лет назад

    Classical error. The Elevator is rigged in the wrong direction. You can see the Elevator commanding full nose down the whole dive.

  • @bobhuston6168
    @bobhuston6168 7 лет назад

    buildim brakeim buildim brakeim. that's what makes the world go round

  • @PotentialAutist42069
    @PotentialAutist42069 5 лет назад

    "How many people do you know who can say they built an airplane from scratch?" Well personally, 3 including myself... but i know dozens more through forums such as homebuiltairplanes.com, eaaforum, wingsforum and more.

  • @JesbaamSanchez
    @JesbaamSanchez 7 лет назад

    trial and error...is the key to success

  • @baysusstudios59
    @baysusstudios59 3 года назад

    I always hate it when the people competing in flutag actually try

  • @bo2web
    @bo2web 6 лет назад

    MIT needs speed !

  • @larze9844
    @larze9844 7 лет назад

    Was that the community college version of MIT??

  • @diegoteclas
    @diegoteclas 6 лет назад

    some of them really flown ?

  • @user-vz1so5dt2t
    @user-vz1so5dt2t 3 года назад +1

    And all that dreams went 4:51

  • @mahilamaseli415
    @mahilamaseli415 7 лет назад

    4:51 is when the nose dive fail occurs FYI

  • @jacoblinks3763
    @jacoblinks3763 7 лет назад

    i found why yours dident win
    so what you did was reinforce the tail with balsa wood you should have used a more durable material

  • @Paiadakine
    @Paiadakine 7 лет назад +1

    Wow. The best and brightest engineering students in the country.

    • @Paiadakine
      @Paiadakine 6 лет назад

      Hello Caltech, can you build a better glider than the MIT entry?

  • @ralop4573
    @ralop4573 7 лет назад

    worth it

  • @humushumor6436
    @humushumor6436 6 лет назад

    This tell a lot about MIT and official "science".
    They should go splitting rocks.

  • @Frostified
    @Frostified 3 года назад

    lol, all they brought?

  • @Emirates-el7br
    @Emirates-el7br 5 лет назад

    5:52 can't stop luaphing because of the guy still hanging going the wrong side xD

  • @cthulhuchrist6289
    @cthulhuchrist6289 7 лет назад

    Parents pay for AP tutors, check. Parents pay for SAT prep, check. Parents pay for tuition, check. Parents pay the judges, oops.

  • @tailwheelflier
    @tailwheelflier 6 лет назад

    Your tail folded right before launch

  • @thegreatders344
    @thegreatders344 7 лет назад

    why aren't you allowed to retrieve the plane?

  • @zoesdada8923
    @zoesdada8923 5 лет назад +1

    It flew like a brick

  • @IvanIvoMartinetti
    @IvanIvoMartinetti 2 года назад

    M.I.T. Mildly Intelligent Techs

  • @bertsmith6272
    @bertsmith6272 6 лет назад

    Well then!

  • @michaelperrino8506
    @michaelperrino8506 7 лет назад

    Doesn't carbon fiber and aluminum coupled together lead to significant galvanic corrosion?

    • @rcrazy2625
      @rcrazy2625 6 лет назад +1

      Yes, but I don't think that would have been a huge impact in a one-time project like this. Titanium alloys would be safe in that case, but a lot more difficult to work with.

  • @ildanny80
    @ildanny80 Год назад +1

    Wow, not only MIT landed pretty short due to a failure, they also broke the rules and got disqualified.... not bad

  • @Absaalookemensch
    @Absaalookemensch 3 года назад

    It did fly 20-30'.

  • @dozer1642
    @dozer1642 7 лет назад

    The best environment to get a real education in 2017 isn't at a university. If you want to argue with me, watch the video to the end and then comment.

  • @Fl3xnyc
    @Fl3xnyc 7 лет назад

    not sure people have dreamt of flying for THOUSANDS OF YEARS..

  • @fmfamily4071
    @fmfamily4071 7 лет назад

    Everything looks good fun and dangerous, but the dynamics and netting purpose ...

  • @Smt_Glaive
    @Smt_Glaive 5 лет назад

    is nobody going to talk about the ailerons

  • @sychrovsky
    @sychrovsky 3 года назад

    MIT aero engineers - built an afroplane , look at the size of that tail , first look tells you this could not possibly fly

  • @camauedd8042
    @camauedd8042 3 года назад

    How can you say you flew your plane when you never had control of it...it just dropped!

  • @YouTubeDeletesComments
    @YouTubeDeletesComments 7 лет назад

    33 feet ion the air? Ok that confirms my suspicions. I wouldn't doubt this takes place on 9/11

  • @sphericalsphere
    @sphericalsphere 7 лет назад +1

    crazy that they even post this on an official MIT Channel. This is embarrassing as fuck

  • @southronjr1570
    @southronjr1570 3 года назад +1

    That didn't look like a weak control point, it looked like a really bad cg