Aerodynamics for Mark Rober's Record Egg Drop

This eggcellent project did not get over easy and although we cooked up some cool simulations, most of these vehicles ended up scrambled.
Mark's Video: • Egg Drop From Space
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[@eddiebooth9795]

I know he didnt talk about how the guidence system works but we all know that the missile knows where it is because it knows where it isnt

[@Codebreakerblue]

Of course we can't forget the subtraction of where it is from where it isn't, or vice versa

[@1224chrisng]

@@Codebreakerblue whichever's greater god forbid "where it is" be greater than "where it isn't"

[@Agnemons]

And when the missile gets to where it wasn't, it isn't anymore.

[@SilentGloves]

I came here to post it!! :D kzbin.info/www/bejne/mIvIZn1uiLt2j7M

[@jaxonwright5447]

good fun

[@enerconfan9138]

First a silo launched rocket and now terminal guidance? This is getting interesting...

[@-coolerlegothings-9784]

Next video: Pranking package thief’s with a nuclear intercontinental ballistic missile

[@paradoxninja469]

@@-coolerlegothings-9784 Very good idea! Lets do it! 🤣🤣

[@ukaszlampart5316]

@@-coolerlegothings-9784 Maybe cooperation with GM Vikhram Rahul Abishek Pranav Rajesh is in order he is an expert in utilising ICBM in chess games.

[@dmacpher]

“You’re trying to achieve terminal guidance 😳” ITAR has entered the chat

[@Bill_N_ATX]

Not a knock on your door you want to answer. Of course, it’s kind of ludicrous since it’s not that hard for a good sized company and dead simple for a nation state. This has been solved for decades. On the other hand, I guess you don’t want a “My first guided missile” kit on sale on the internet.

[@LewisRawlinson30]

@@Bill_N_ATX think of quadcopter/drones. The tech has been around for decades, anyone COULD do it but nobody knew how. All of a sudden the hardware and knowledge is much more common and every man and his dog has a fucking drone. To conclude, I agree, you absolutely don't want that with terminal guidance.

[@rogerrabbit80]

@@LewisRawlinson30 I beg to differ! My dog does NOT have a drone! We're getting her one for Christmas.

[@UnlikelyToRemember]

I am reminded of when I was in college back in the early 80's our IEEE student chapter (at least the American citizens therein who got cleared) were invited to visit a defense contractor. At one point in the visit we were watching a simulation of the terminal guidance of a missile and it did {something interesting} and so I asked "why did it do {something interesting}?" at which point that part of the visit was quite promptly concluded.

[@spamcan9208]

@@LewisRawlinson30 I think battery tech is what allowed the drone to become so ubiquitous that consumer off-the-shelf models are now dropping grenades and spotting for artillery.

[@iamthestog]

I started watching Mark's video and thought "he needs to do this with BPS" just seconds before Mark introduced you! Awesome work.

[@_-ALASKA-_]

Same!

[@_-ALASKA-_]

Same!

[@abutalha2902]

Same

[@Luba_z_mesta]

I had the same thought! Haha!

[@CptFUBAR]

As soon as Mark mentioned "stabilizing fins" on a rocket, I thought, "hey, isn't that one BPS doing something like that? HEY! it's HIM!" 😂

[@illuminatustm]

5:30 The phrase „This is a decision I regret deeply and I think about often“ cracked me up way more than it should have 😂

[@drummeruptheirons]

I can't believe you didn't call it HARVEY. High Altitude Recovery Vehicle for Egg Yeeting

[@NonLethalGhost]

BAHAHAHAHA!

[@mohamadabdulrahim5869]

LMAO

[@Agnemons]

You play way too much Stationeers.

[@fox3missilevr965]

Is still classified as yeeting if your just dropping some thing

[@dillonvandergriff4124]

I love how you say Mark "validated" the egg could survive terminal velocity. Makes it sound much more technical than a slingshot and a radar gun lol!

[@redpug5042]

next up: how to guide a powered, high velocity vehicle towards a point on the ground with 1 meter of precision

[@fish_cylinder]

the missile knows where it is...

[@1224chrisng]

@@fish_cylinder ...from whichever's greater

[@apogeemc2555]

I don't have anything to say I just want to support Joe's channel by commenting

[@MaxTheBest97]

Hey man, aerodynamics engineer here! I strongly suggest you to repeat the test but placing the test model over the roof in the most central position. The position you chose here has a big problem: the airflow does not arrive on the winglets parallel to the ground as you were supposing. The air is in fact following the shape of the car and therefore it was arriving from underneath the axis of your assembly. You were basically simulating what would happen during a turn or a very strong lateral shear.

[@a.p.2356]

He could also come up with a way to mount the whole test assembly out into the undisturbed airflow in front of the car. Probably would want something sticking out a good couple feet in front of and above the bumper.

[@MaxTheBest97]

@@a.p.2356 yeah it would definitely be even better, but more expensive.

[@Lekosa1000]

That was the first thing I noticed.

[@texasyojimbo]

The egg knows where it is, because it knows where it isn't.

[@bradnarraway9141]

More than anything with this experiment, I cannot tell you how much I loved when you all realized you were making guided missiles.

[@sympak]

Me watching Mark's video: Mark wants to do what with a rocket? That sounds like something Joe would do. Oh there he is!

[@BodeBoi-dt3hg]

This is literally my favorite thing. I’m 15 and I had always dreamed of breaking some really mundane record and about a year ago I started working on a weather ballon egg drop I have already built the whole capsule and I themed it like an Apollo capsule. I have yet to get the balloon or helium but it is so incredible to see that it’s possible. I just wanted to say thank you for being an inspiration and your channel is what made me have the goal of becoming an aerospace engineer!

[@tvre0]

Even if you're not breaking the record, it's still an incredible accomplishment for you to do it. Best of luck!

[@maxv9464]

That's badass! Best of luck to you, you should definitely post some videos when you start testing.

[@ansleylobo8917]

Best of luck for the drop I hope you post a video of it when it happens

[@BlueOriginSFS]

The capsule idea is cool but how will it be stable during free fall, A capsule that small would probably go choatic

[@Xplicid]

Throw a video up when you launch. I subscribed 👊🏽

[@haph2087]

Yay, backyard guided ballistic missiles!

[@kevinmccallister7647]

Man I can't express how much of an inspiration you are

[@Chezburger8]

As soon as he mentioned this idea in the video I thought “wait, isn’t that just a guided bomb?”

[@garyduscha2579]

Hi Burgermister your probley right

[@CorwinPatrick]

Define "Egg"...

[@rogerrabbit80]

@@CorwinPatrick IIRC, during WWII American bomber crews referred to their bombs as "eggs."

[@spieker131]

Mark's video was a GEM! You did a great job with the design. Hope to see you succeed with all your projects in the future mate! Greetings from The Netherlands 👌

[@garyduscha2579]

Mark is so smart he should be working for space Xxxx

[@aarav1648]

I never thought I would get to watch two of my favorite personalities work together. It was a pleasant surprise for me and others. I hope you continue to intrigue us with you crazy future endeavors🙏.

[@gednebulizer8810]

Man... to be asked by a NASA engineer to essentially be the technical lead on ANY project, would be such an incredible life achievement. Props to you, BPS, you dedicated intern.

[@Brixxter]

Always nice to see you helping out some smaller youtubers! I would have loved to see the system working in practice, a shame authorities wouldn't have liked it

[@zacharyduncan854]

Long time follower of this channel. Love seeing your talent recognized around the KZbin community. Excellent stuff Joe!

[@z31drifterlf]

12:15 I thought you were going to troll us with the "rocket knows where it is" meme

[@RafiLerman]

Two videos in two days? Thanks for the thanksgiving treat Joe!

[@just_another_fan418]

As a longtime fan of your channel, I was super excited to see that Mark collaborated with you on his latest project! I hope this helps get you a lot more exposure and brings more attention to your awesome projects!!

[@wxmanthunder]

Really great team-up. I thoroughly enjoyed both your and Mark's videos.

[@internalerror00]

Dude, it makes me so happy to see you collaborate with Mark. I hope this is a boon to your channel. You deserve way more recognition than you current receive.

[@corncrasy]

This was the big thing you’ve been hinting about for so long! So awesome! Love your videos and Marks!

[@nathanel1313]

Joe, you are such an inspiration. Great work, as always.

[@paulmaynard408]

Another wonderful explanation Joe. Thanks very much and Merry Christmas 👍😊

[@edoardocostantini2930]

the egg knows where it is because it knows where it isn't.

[@velocitylaunchsystems]

Great collab Joe! Congratulations on achieving 500k subs!

[@henrywit6147]

Great video, and great work, Sir. Loved the outtake / video at the end. Came here after watching Mark's egg-drop video. Now a new subscriber!

[@kekblob]

This video is a great compliment to Mark's video for a more technical dive into the mission.

[@n8dawg640]

I was really happy when i saw mark’s video earlier and realized you were in it, love it when two people i follow collab out of the blue

[@AlexBrugh]

Really glad to see this collaboration finally happen. Been wondering if/when we'd see the result since that first tweet of mark's.

[@xxxdiresaintxxx]

Great stuff Joe! We finally have an answer to the question of what you were working on all that time in the background!

[@Kimballgoss]

Forget about any of the failures, I absolutely loved both of your videos. The engineering depth you go into is just absolute gold. Great work Joe, keep it up!

[@antiLGTBQ]

Honestly I think you could pull off throwing together a self-landing rocket with an egg and just drop that, a few hurdles but the work is mostly already done. Fantastic work man!

[@atts_other_at]

That would be sick

[@Inspirement]

So this is the video where we don't learn how to make a guided missile?

[@jamescollier3]

they won't let you use The GPS system for high or fast objects

[@cassgraham7058]

This is one of the most awesome videos you've done! Joe as consultant makes your strengths shine, and as someone who deals with the limits of where reporting ends and federal agents knock on your door (sometimes for the nth time), you did a great job on toeing the line. One quick side note: body wake (as you put it) is called a "deep stall" in aerodynamics. It originally was a problem when turbulent wake from wings made a t- tail empennage on an aircraft go from a recoverable to an unrecoverable stall... and also why lifting bodies as aerodynamic structures became a thing. Congrats on y'all doing the world's highest egg drop! That's phenomenal! (I'm gonna fan girl and say you did the hard work here, js!)

[@T_Mo271]

Loved the closing few seconds. Now that's rocketry.

[@nputman]

Great explanation on how you approached the fins! Your channel is entertaining and full of great information. Thank you for including the video at the end...🤣 The gurgling is hilarious!

[@NickCombs]

I can't help but think of an egg drop I did in college. It wasn't very robust because we were limited to 30 3x5 inch cards and some scotch tape, but design worked very well. It was like a spinning seed, except with 4 helicopter blades. We tested from three stories up, but it stopped accelerating downward almost immediately as most of the force of gravity was being converted into rotation and creating lift. It landed on concrete as softly as if we'd set it down by hand. Since you ended up eschewing the landing pad, a similar design instead made out of carbon fiber could have worked here. It does wander in the wind, but the gyroscopic force keeps it upright. Wherever it does land, it can't become a danger to anyone because it's terminal velocity is so low.

[@MikesTropicalTech]

I just watched Mark's video and I'm glad you had the technical followup.

[@lamma3282]

Joe Joe Joe I am frucking surprised when you cooperated with Mark

[@madeintexas3d442]

I love your James Webb mirror. I had some of those tiles show up this week to make the same thing.

[@ScottayH29]

Hi! Im here from Mark Rober's latest video! The stuff you do looks really cool! Cant wait to see what kind of things you come up with!

[@dallasstroud8061]

Great video as always!

[@patrickkamm04]

I was not expecting to see you at all in Mark’s video, this was really cool!!

[@marilenalatifi1600]

Dude your channel is huge now. Proud of you.

[@jasonlockhart4647]

So glad you got over that thing you were going through I love your videos keep up the great work thank you for putting videos out

[@chrissugg968]

Two Bepis Space videos in two days? You are spoiling us!

[@IAteYourCookiez]

just watched Marks video and was happy to see u in it :)

[@Billybobble1]

Hi I'm new here off the back of seeing a clip of the controlled landing, which was simply stunning work. I saw your last vid and now this one, I'll be here for a long time (and catching up on some vids), excellent work friend.

[@MrKozeljko]

Holy shit Joe. I was watching Mark's video and thought you looked familiar. Then I remembered (after some scrolling) that MXL 990/991 video you posted all those years ago. Talk about a blast from the past, wow

[@shreckmoonman]

just watched it XD awesome video….. thanks to your years of hard work millions had an enjoyable video

[@bobjoatmon1993]

I think your collaboration is so cool, your a giant walking with other giants!

[@tec4303]

Those are the most incredible KZbinrs that could have collaborated

[@MrHichammohsen1]

Just arrived from Mark's channel! Cool project.

[@jacekkono5484]

I just happened to see his video first and your cameo made for the best cross over on KZbin.

[@OpreanMircea]

it's hard to talk about something you failed at, I appreciate you

[@alexpatrick8670]

Joe your awesome! I love your videos

[@secondengineer9814]

Wow! That 90 degree turn was awesome!

[@shufflerp3868]

Very interesting.... and intertaining all at the same time.

[@qewbe]

I remember seeing that tweet, very happy it finally happened

[@william2chao]

Thank you for keeping the world in peace.

[@DReam-mn4mj]

Love when u talk meter wise ❤️

[@andymuzzo8568]

Awesome work. I love the sound after it splashed down in the water. I sounded like the Predator

[@Beltonius]

On the plus side, those parachutes didn't tear. So the bungie did its job.

[@raymondhogea826]

That last clip at the end was like a spaceship landing on a unknown planet. Very cool project

[@DesignedbyWill2084]

I assume you haven't watched Mark's video yet...

[@needleonthevinyl]

I love the JWST mirror display you have

[@CameronMakesRockets]

The collab I didn’t know I needed!

[@Heinickens]

I love your mirrors in the background the first thing I thought about wast the JWST.

[@jasonrubik]

10:00 Joe is getting good at salvaging data from broken rockets: "The entire vehicle is the loss ... and although the data from AVA was recovered (because I'm really getting good at doing that ) the rest of the vehicle was a write off"

[@thenoobsays]

it was funny to hear you talk about how hard active fin stabilization is in your last video and then immediately see you do active fin stuff in marks video

[@philippe9625]

And that's why unit testing was invented. Great video :)

[@kitsandham7001]

The Wright brothers tested their propellor blades using a bicycle as a wind tunnel. They measured efficiency using a sprung pivot.

[@colinberg3342]

Sick collab!

[@connecticutaggie]

Great partnership - you guys rock!!! (et)

[@matrick1356]

The moment i saw a rocket steering thing in mark's video, i know you had to be in there, and i was not disappointed

[@bernardli9514]

I'm genuinely surprised you didn't get ITARed. Well done!!!

[@greenmonster4486]

hey! congrats on 100k

[@willtheelectrician8184]

Congrats. I hope your channel blows up from the Rober collab.

[@timaidley7801]

I enjoyed the sound of the water leaking in to the rocket at the end.👍

[@xSiliconKnightx]

I am surprised you didn't mention center of gravity or aerodynamic center of pressure in your stability explanations. Getting those 2 things working together would pretty much make the rocket stable.

[@adrianescamillacaballero252]

I think you are a great maker

[@fhmconsulting4982]

From a laymans perspective I guess the lesson is that if you stick your hand out the window of a moving car it is easier to control air flow palm flat, like grid fins, versus fingers forward, like surfboard? Great collaboration with Mark and hopefully this gets you lot more recognition.

[@evanbarnes9984]

I'd love to get a 20 minute video on dynamic stability!

[@hu5116]

Hi Joe, great vid! My only critique, is not to be TOO proud of your work (although definitely be proud). What I mean by that is rest assured, there is nothing you did, nor anything you could have or might have done from a security perspective that is not already reviewed in thousands of papers, theses, reports, books and other media for anyone to find and learn. How to guide a vehicle to a target has been out of the bag for a really long time, and any concern that you guys might be revealing some deep secret is completely unfounded, and might even border on hubris (and I say that as a practicing defense engineer). Although you might not want to give out the recipe for nitro glycerin, lest some young kid tries to make it and blows themselves up, making a working interceptor is going to challenge even the best, to actually get it to work. But thanks for the vid and congratulations!

[@kalebbruwer]

14:00 You can replace this with: input = fmin(input, constrainLimit) input = fmax(input, -constrainLimit) It's a nice little trick to reduce branching and complexity

[@SpaceMace31]

Props for using "egg-centric" un-ironically

[@KatR264]

Just found this channel after watching the Mark Rober vid 🙂

[@rexmundi8154]

It’s interesting how our experience guides our imagination. Since this was going to be a ballon dropped device, there was no reason to make the apparatus rocket shaped. Since it doesn’t have to move effectively thru the atmosphere to get to altitude. In fact, the rocket shape actually returns to earth too fast for the goal. It would be cool to do it with some type of space plane / glider design with a cargo door.

[@ultima3345]

The fact that I lived less than an hour from you for so long and never realized is criminal 😫

[@Leo99929]

You could have put a air speed sensor on the rig to check what the wind speed actually was near the device.

[@fish_cylinder]

the egg knows where it is at all times. it knows this, because it knows where it isn't...

[@nathandeleeuw281]

“The missile knows where it is at all times. It knows this because it knows where it isn't.”

[@JMuks]

This guy's made me fall in love with physics 🤩, and he's self taught 😭

[@Leo99929]

It's standard practice to run the tests in opposite directions in quick succession, then average the two, in order to compensate for environmental wind direction bias.