O'Neill Cylinder Space Habitat - actual size

[@isaacarthurSFIA]

I like the towers for helping show scale

[@codmortel2821]

Hey it’s isaac😮

[@isaacarthurSFIA]

@@codmortel2821 :)

[@pooiuish]

Its just like Gundam

[@HeIsAnAli]

@@pooiuish Hence the plot line behind Operation British.

[@zaurenstoates7306]

Found a wild Isaac!

[@facedeer]

Something else you might consider to give this a more intuitive sense of scale would be to add a bit of atmospheric haze, that's something humans expect when looking at things a very long distance away. Perhaps also give an indicator showing what velocity the camera is moving at.

[@Voshchronos]

This! Also using a less uniform texture tiling in the inner cylinder. Adding trees, roads, other variations, etc. Helps with the aliasing too.

[@alexandretorres5087]

Perhaps do both, first show this as a skeleton structure, then show the cylinder with atmosphere and humidity levels. Cumulus clouds float at 2km, sou you could actually simulate a hidden center by the rainy day.

[@highlorddarkstar]

The camera appears to be moving at 100m/s based on the distance from entrance numbers… so super car speeds of 220mph?

[@adamlytle2615]

Yes for sure, atmospheric haze and even clouds to give a sense of what it would actually look like. I'd love to see that - for an O'Neill cylinder and also the larger McKendree Cylinder or Bishop Ring.

[@ccib00]

Consider that this could be built with steel and it already looks big and impressive. There is a carbon nanotube version of this called the McKendree cylinder that is even far more massive. I cannot imagine the scale of that thing. Thank you for this showcase!

[@user-tp9gy8kt2q]

Ccib, bring on the Mckendree cylinder..! I can barely imagine something of that magnitude myself. But I do look forward to the conceptualizations of these genius visual artists. This is how we move forward - with newer and newer conceptualizations, each carrying another advancement of thought. What would Gerard K. Oneill think of today's renditions of his amazing concept?

[@mordinvan]

That one I like folding a continent into a taco.

[@lavenderlilacproductions]

Can steel do 8Km diameter? I had in my head it was only a KM or so

[@spvillano]

Steel might be a bit too massive. While it'd lend strength and toughness, mass is king when making any structure - especially something that's to spin to provide pseudogravity. Aluminum and graphene would be doable and should still be tough enough to withstand stresses of a small sea for water balance. Although, collision avoidance with meteors would still be desirable. Wow, just thinking of a Whipple shield for that thing *really* boggles the mind!

[@kayakMike1000]

​@@spvillano angular momentum would pull the hull outward, so some cables across the diameter could be used for structural support.

[@cuddlebuff]

As a longtime Gundam fan, this is so awesome.

[@ydvisual5530]

Thanks - I will try to drop in some Gundams next time :)

[@1VAHNFANEL]

THIS IS PROBABLY THE BEST BET that will allow us to live beyond EARTH!!!

[@user-tp9gy8kt2q]

Thanks for your amazing and thought provoking video. Your introduction to scale really helps visualizing the overall effect. I am a big fan of Oneill cylinder concepts and I look forward to your continuing efforts with this topic because I consume Oneill cylinder content with a voracious appetite. It is one of my favorite topics to ponder. You even got Isaac Arthur to comment on your work - that's awesome.

[@ydvisual5530]

Hey thanks for the nice comment Mr. 00000000 000000000 - It was fun to make and great to see it full size with my own eyes!

[@Maytrx]

I first saw this on Facebook about a year ago. And I finally came across this on KZbin. To the creators, you did a great job.

[@ydvisual5530]

Hey Maytrx - thanks for the nice comment! It just me one guy who did this - it took awhile lol

[@Maytrx]

@@ydvisual5530 If we ever get to building these, I hope that it will be a rare thing for someone to try building an entire O'Neill Cylinder on their own. Might take millennia for one person. FISL(Float In Space Laughing).

[@SubtleHawk]

I love this. Definitely subscribing. I've always seen pictures of megastructures online but being able to get a sense of perspective is awesome. Makes me excited for the future of humanity.

[@ydvisual5530]

Thanks! It was really fun to make !

[@JFrazer4303]

spincalc says .4728 RPM, 198 meters/sec tangential or rim rotation speed. The NASA Ames / Stanford studies in the '70s said that the largest pressure vessel which we could build to rotate for 1G and hold shielding and everything inside was ≈30km diameter, by maybe as long. (no longer or it's unstable. No 4mile by 20 mile cylinders because they'd want to spin end over end. Yes you can counter the instability, but it's not good to engineer in defiance of the laws of physics and then apply complexity to overcome the design flaws.) Concrete and steel. No hand-waving about sentient AI nanotech self-assemblers or industrial amounts of graphene needed. If we use Titanium (which isn't particularly rare out there) maybe twice as big (again, known practiced engineering).

[@Contrarian-ol2bc]

Great insights, I agree. Especially about graphene, that stuff is extremely toxic as it cuts open cell membranes. Another alternate material is basalt fiber, it is chemically inert and stronger than kevlar, yet has a high melting point and is not subject to breakdown from UV or x-rays. Stony asteroids are full of the ingredients needed to make the stuff by the gigaton. This is becoming more popular as a construction material as it has an expansion coefficient very very close to that of concrete (replacing steel rebar). It is also made into cloth for fireproof clothing and heat shields in automotive applications.

[@persacom99]

Great job. Love the sense of scale. Nice to see the real thing instead of some of the paintings and art that don't quite get the perspective perfect.

[@ydvisual5530]

Thanks - yeah thats why I really wanted to make it finally in full scale !

[@Jorjgasm]

This is amazing. Imagine that its interior surface area is around 800 sq km, so it is just two thirds of Los Angeles or of New York

[@ydvisual5530]

yeah huge !

[@abelardlindsey7579]

Somehow, trance music goes well with these kind of videos.

[@ydvisual5530]

Haha yeah

[@mmo4754]

That O'neall sure like's his cylinders

[@ydvisual5530]

agreed*

[@HawkGTboy]

Imagine if all the money we’ve spent on wars for the past 22 years had gone to this instead. We’d be very far along.

[@ydvisual5530]

INDEED !

[@JFrazer4303]

The '70s NASA studies assumed Lunar materials, lifting all the water and process chemicals from down here. If they'd started then, the first O'Neill "Island 1" 800 meter diameter sphere (or "Stanford Torus" 1900meter diameter torus) along with all the ground, launch, and in-space infrastructure to reproduce it and build Solar power satellites would have been done by 2005. Cost would have been like many other large infrastructure or industrial developments down here. Like the Interstate Highway System, or 3 or 4 of our CVNs and their air wings and escorts and the logistics infrastructure to deploy them to fight over oil. Much less than the bailouts we've seen or a small oil war. For comparison, during the entire timescale of the Apollo program, the US spent as much on cosmetics, and large States spent more on liquor, than we spent on Apollo. The US easily spends more on each: fast foods, illegal drugs, sports gambling, and lotteries than on NASA. Today our _annual_ DoD budget is greater than the entire historic running grand total NASA expense. Counting Apollo, the Shuttles, the ISS, and everything else NASA does. Not counting "black" military items or ongoing military operational costs, which aren't in that voted DoD budget.

[@gabuge2928]

To long didn't read

[@JFrazer4303]

@@gabuge2928 Then you don't care about facts or the subject. The content creator still tanks you for the comment which goes into the algorithm.

[@BlazeMakesGames]

Man I really wanna make/play a game that takes place on a fully explorable O'Neil Cylinder like this. For extra spice it'd be funny if it was a fantasy game

[@ydvisual5530]

Hey BlazeMakesGames - thanks buddy! Actually I have considered this very idea! Perhaps I will make a prototype single player version and then later multiplayer!

[@jonathangavin7560]

You would love Gene Wolfe's Book of the Long Sun, it's exactly what you are describing.

[@eddielopez350]

This Digital rendering put everything in the right perspective i even can feel the Dimension of the massive space station in this video

[@reasonforlife214]

Exceptional work ! I hope you will do a McKendree cylinder next

[@ydvisual5530]

Thank you sir :) - OK McKendree it shall be :)

[@MichaelSkinner-e9j]

O’Neill cylinders can literally be the new refuge that people look toward. They can be a source of hope, where people go to leave war behind

[@ydvisual5530]

true!

[@sanguiniusonvacation1803]

I know your being serious, but all I can think about is a sci-fi setting where that same idea lead to giant mechs and someone throwing a couple of these at the Earth

[@pooiuish]

No people? Zeon must have gassed this colony

[@ydvisual5530]

LOL

[@mso82]

Now I want to play a video game based in an O'Neil cylinder

[@ydvisual5530]

OK I will make one!

[@mso82]

@@ydvisual5530 I imagine it as a mix between CyberPunk2077 and Space Mechanic Simulator

[@tedsmith6137]

I guess O'Neill read "Rendevous with Rama" by Arthur Clarke.

[@mxmike123]

The Rama series was one of the best stories I've ever read. The last words of the 1st book..."the Raman's do everything in three's" gave me chills.

[@islandpalm148]

Rendezvous with Rama was published in 1973. O'Neill was working on these concepts since 1969 when he asked his physics students at Princeton, "Is the surface of a planet the right place for an expanding technological civilization?" The answer was "no". The best place, they found, was "on the surface of the plateau of free space".

[@JFrazer4303]

O'Neill put real hard engineering numbers behind it, not just S.F.

[@MichaelSkinner-e9j]

There are so many ways you can make a Cylinder. You Should be able to make one to be able to withstand the heat of the sun and solar flares

[@kairon156]

Super cool. though meters mean little to me vs feet but the plane and tower really helped.

[@Kira22558]

Beautiful .

[@ydvisual5530]

Thanks, it was fun to make :)

[@kemmerer]

Very impressive model, giving an excellent sense of scale. Note that the actual rotation speed would be 0.467 rotations per minute.

[@pikachu5188]

Wrong !! 2.8°per min /360° = 0.00778 rotations per min. or 1/128.57 rotations per min = 0.00778 rpm

[@jeremygoodall7799]

​@@pikachu5188 the rotation rate for the stated gravity should be 2.8°/second... which is more in keeping with what is shown in the animation.

[@pikachu5188]

@jeremygoodall, I was given the value of 2.8°per min. which I found low. This would take 128.57 minutes per rotation. Then I used a centrifugal gravity calculator and 2.8°per second is correct which will take exactly 2 minutes 8.6 seconds per rotation. Then I notice the graphics are exact but the gravity indicator (g) is completely wrong.

[@hectorrubio7141]

it is amazing, May be draw an stadium to compare

[@thomaskline5164]

Love the Camera work and perspective been trying this in blender for years. Great Job

[@ydvisual5530]

Thanks it was fun to make! Some of the parts of this animation I actually made with Blender.

[@MichaelSkinner-e9j]

You could literally use the size and scale of an O’Neill cylinder like the gear ratios in a car. Trying to move between five and 50,000,000 tons of mass is hard for any kind of chemical rocket. Bordering on impossible. All you really need to do is get it moving just a bit in the right direction for a little boost. You don’t need much, but moving it That Little Bit is a Herculean task that you have to use the size, scale, and mass in order to do it After that, you can use nuclear drives or plasma/fusion drives and throw salt or heavier metal out the back

[@r0sal3sr]

This looks detailed enough that you should be able to simulate the automous robotic construction process and get other inital construction cost, time, and energy efforts! Can you get a rough bill of materials in terms of the basic hull and other structural units you selected?

[@ydvisual5530]

I was thinking about making a simulation/game that can calculate all that on the fly!

[@Skyler827]

Great let's build one

[@Voshchronos]

Woah, this is really impressive to show scale. Nice work.

[@ydvisual5530]

Thanks! It was fun to make :)

[@richardpoynton4026]

We could have all this, if some country/organisation would build the machines………. that would then build the machines that make the machines that will construct these stations. And if you can build and populate one, you can build a thousand, then a million

[@MichaelSkinner-e9j]

You need a lot of liquid nitrogen and dry ice to start with. However it is done, you could start building in sections, put up walls, and once you start rotating with a H Bar, you should be able to start with an atmosphere immediately

[@MichaelSkinner-e9j]

What we need is an open O’Neill cylinder design that anyone can tweak and add to it, like Linux. Any and all options need to be on the table. The Cylinder Needs To Be For All People.

[@ydvisual5530]

Hi user-um9sl1kj6u - I am thinking about making a full PC Desktop game where you can wonder around the entire cylinder!

[@lewismassie]

I've seriously wanted something like this for years. And you get the scale across so well 4:25 I don't properly register the spinning until this part here. So cool

[@ydvisual5530]

Yeah me too, i was even impressed when I finally got it working haha!

[@AGPMandavel]

Highway at scale really helps, include travel speed of the cam next time

[@ydvisual5530]

ok! good idea!

[@sanguiniusonvacation1803]

Should have used a city for scale too...maybe Sydney!

[@ydvisual5530]

YOU GOT IT BUDDY :)

[@maj.d.sasterhikes9884]

Seems like it would require an established infrastructure in place for mining and processing the asteroids just because of the huge volume of materials needed.

[@MichaelSkinner-e9j]

I would love to see one constructed Up Close, before any work has been done. Just to marvel at everything! I would love to be present when work starts for putting the atmosphere, The concrete, the ground, the grass, trees, the bodies of water, everything... Especially when the atmosphere is being brought in.... I would like to see most of it is dry ice, sublimating, and then you bring in water to evaporate, let the grass and the plants do their thing, and if you need more oxygen then you could bring more... ...think, just like Genesis. - Star Trek, anyway...

[@tonyv8925]

Actually, you could harvest ice from the asteroid belt. Breakdown molecules, hydrogen for reactors, oxygen for the atmosphere.

[@Hamdad]

"Now, how do we get all the soil up here"

[@MichaelSkinner-e9j]

It would be nice if it were a little longer, and had stabilization cables (thicker than the Golden Gate Bridge and made out of either stainless steel or graphene carbon fiber) and had “elevator pods” (between the 4 Huge Cables about 8 feet thick each) that went to the central spine.

[@MichaelSkinner-e9j]

I would imagine for the central spine, that would be more like a tube (Think of the geometry of a fusion reactor, but long) The iris would open to allow either light or just craft/asteroids in. There’s also a way to design a Cylinder with ”Windows,” it just requires most of the mass to be able to be uninstalled, leaving the skeleton and mesh.

[@stcredzero]

Here's what I'd love to see: Some weather simulations for O'Neill cylinders! Is there such a thing?

[@ydvisual5530]

Yeah some of us were talking about that the other day, it would be a cool physics simulation! Hey also - this video just a surge of viewers, may I ask how you found this video ?

[@stcredzero]

@@ydvisual5530 It somehow came up on the right side after I watched an Issac Arthur video. Or maybe it was under Home. Not sure.

[@ydvisual5530]

@@stcredzero- ok cool thanks for reply !

[@unarmored9973]

I was thinking how interesting it would be to "sky dive" off the core until I realized that the surface speed of what you'd be "landing on" is traveling hundreds of miles an hour, I bet you could still do it since the "wind" would have graduated velocity relative to the distance to the hull (I think).

[@ydvisual5530]

Yeah , I was thinking about that too! haha not sure what would happen lol

[@melissarainchild]

Basically: Rama. Love it. Of course...not viable as humanity is not united enough to do this...

[@michaelwilliams2593]

Great video. I love how well a communicates scale of the project. But why highways? Private cars take up so much room and are so inefficient at moving people. Trains, a version of trains uniquely configured for a. Cylindrical setting, or some type of cable cars would be a much better fit for this type of settlement.

[@ydvisual5530]

hi thanks :) Well, I at the time I just ran out of 3d models to put in the giant thing and I had some highway models laying around haha.

[@MichaelSkinner-e9j]

Imagine what a city in an O’Neill cylinder would look like if it was orbiting Saturn! On one end, they could look towards the sun or the earth, and the other end they’re looking at Saturn’s rings up close, catching asteroids as they go!

[@ydvisual5530]

Good idea! I will try to make an animation of that !

[@MichaelSkinner-e9j]

@@ydvisual5530 look up how whales and other large predators catch fish in their mouth (like a whale shark) One one end, you can open it up like an iris, and asteroids could literally just float in, and you could just pull them to the side, and once they touch the wall, you just mine it like normal! Imagine someone taking a road trip from one city to another, go to school, have restaurants and businesses and look just like Earth, and then they all watch Huge Asteroids get engulfed and launching spacecraft to and from! -it could literally be just like earth, and then you look to the side and it would be incredible!

[@ydvisual5530]

@@MichaelSkinner-e9j thanks good idea!

[@MichaelSkinner-e9j]

Technically, the spine would be a little thicker to accommodate a tram for civilians/workers and you could have inner rings/islands attached to struts that would also reinforce everything (besides being trams/elevators)

[@DoddyIshamel]

Imagine, all those stairs in the tower but it actually gets easier as you climb them

[@ydvisual5530]

haha good point! Could make for some interesting sports/olympics in the structure lol

[@nosuchthingasshould4175]

The first habitats would most likely be much smaller, the minimum size to allow 1g at comfortable spin rate is about 500 meters so comparable to the towers shown.

[@ydvisual5530]

I am thinking about making a simulation of exactly that ! thanks for input!

[@nosuchthingasshould4175]

@@ydvisual5530 Great! How about placing the small habitat inside the big one for comparison, next to the tower and perhaps a few other megastructures such as a Golden Gate Bridge and a supertanker, to visualise how close we really are to being able to do this.

[@billmilosz]

People won't pay enough in taxes to decently educate their own children or care for their elderly parents - what makes anyone think they would pony up for something like this?

[@MichaelSkinner-e9j]

If we are going to make something that large, you have to be in a much higher orbit. Just so you don’t leave a huge shadow on the earth.

[@spvillano]

Wait, where's the cylindrical sea and biobots? ;)

[@DrMedos]

rendezvous with rama vibes

[@ydvisual5530]

indeed

[@shanerooney7288]

Love having more visuals for space megastructures. However, the camera work could be smoother.

[@ydvisual5530]

Fair enough - I guess I should stick to special effects and hire a director haha.

[@shanerooney7288]

@@ydvisual5530 Can you code the camera to follow a set path? Or code it to slowly accelerate/ decelerate on key press? Eg: you want to pan left, you press left, the camera slowly accelerates left, until top speed. Release the key and it decelerates, takes ½ second to stop.

[@ydvisual5530]

@@shanerooney7288 yeah there are a lot of ways to do it properly - I just ran out of time

[@kahlzun]

Wouldnt it need struts partway along? Otherwise the steel in the middle is trying to hold up 16km of steel against ~1g, which sounds difficult..

[@jhwheuer]

I’d love to know what the air flows, currents and winds are in this drum.

[@ydvisual5530]

Yeah would make a great physics simulation!

[@vaakdemandante8772]

It could've been 5x shorter video and would be even more awesome that way. BTW a Burj Khalifa model would give even better sense of scale. The 2.8 deg/min makes no sense - the light ray moves waay faster than that.

[@ydvisual5530]

Yeah sorry - i corrected that in the description - my bad.

[@brandonbowerstx]

Is that 2.8 degrees / min or per second? Great visual and video

[@ydvisual5530]

Yeah per second - sorry about that haha

[@Khannea]

Can you add a sun and surface activity?

[@ydvisual5530]

OK!

[@MichaelSkinner-e9j]

That’s Literally millions of metric tons of metal. Never mind any other design mass considerations

[@FourthRoot]

You need to make another correction in the description. It doesn't rotate at 2.14 RPM, that would work out to about 12.84 degrees per second and about 20 Gs. I think you meant one rotation every 2.14 minutes (2.115 MPR or 0.473 RPM by my calculations for exactly 1 G at a 4 km radius).

[@ydvisual5530]

Ah, well spotted nice catch. I just updated the description. Thanks!

[@RobertDeloyd]

It would be really cool to have it populated with houses, farms, towns... stuff like that and make it so you can explore the "Space Habitat" using Google Maps! Yes, that would be really cool!!! 🪐

[@ydvisual5530]

AGREED* Good idea! I am thinking about making a simulation you can download and play as a game - and customize the terrain, lighting, architecture, etc!

[@RobertDeloyd]

@@ydvisual5530 I'll keep a lookout for it! Pretty amazing as it is, 🚀and that would be fascinating

[@ydvisual5530]

Also, thank you very much for subscribing @RobertDeloyd

[@ronaldwhite1730]

Thank - you . ( 2023 / Dec / 14 )

[@ydvisual5530]

YOU ARE WELCOME (2023 / Dec / 16)

[@bigdopamine9343]

Flying a 747 around in there would be interesting.

[@ydvisual5530]

haha yeah that would be cool, a flight simulator in an o'neill cyclinder ! haha. Hey also - this video just a surge of viewers, may I ask how you found this video ?

[@bigdopamine9343]

@@ydvisual5530 it popped up on my feed. I watch a lot of similar science stuff. It’s a really well done animation.

[@ydvisual5530]

@@bigdopamine9343 thanks! it took a long time to make haha

[@joelcarson4602]

In the low gee center you could have pedal powered skycycles, so instead of Icarus flying too high and melting his wings it would be flying too low that would cause you to crash.

[@JFrazer4303]

an ultralight though...

[@mpbroadcast]

Something looks off. The distance to the center looks much more than 8x the height of the 500m building.

[@ydvisual5530]

I know what you mean - it's hard to see. When building it though, one time I stacked up 8x of them and it did reach the mid haha

[@cobbler3376]

Wouldn’t there need to be a number of large supporting columns like bicycle spokes? By the way, this is fantastic. Best scale rendering I’ve seen.

[@ydvisual5530]

Hey Zach thanks for nice comment! Yeah maybe spokes, not sure - Let's ask some engineers for opinions. There are tons of factors. I am just a graphics/software guy haha

[@Cyberwar101]

No you wouldn't, they would be useful for carrying cargo and passengers to various parts of the hab, but would actually be detrimental to structural stability. This is because the stability comes from the centrifugal force. This pulls on all sides pretty well equally. Adding columns on that would be adding a bunch of mass to a small part of the structure, which is bad since you want mass to be mostly ste same along the entire curve. Essentially the pull happens at the circumference, not the radius.

[@BlackEpyon]

It's like a suspension bridge that just keeps going around in a circle. Because it's curved in a cylinder, it's tension across the material that maintains it's form. No one spot along the surface can sag due to induced spin-gravity without tugging on the adjoining sections, and in that way, it acts like a suspension bridge. Your only limit to diameter is the strength of the material.

[@SeanSoraghan]

What rpm will it have too spin at to get 1G

[@kahlzun]

@@SeanSoraghan as per the video, its about 2.8 degrees per second, or 168 degrees per minute. Thats about 0.47 RPM

[@pazsion]

It’s possible and we can make it deflect 90% of the asteroids in near orbit too… at the scales possible it could deflect things 30% of its mass if it bypasses planetary defenses scalar and directed energy…

[@randallross420]

Is it big enough in there to have its own weather

[@ydvisual5530]

We were thinking about creating a weather simulator for it... Not sure how to do it though, maybe CFD software?

[@randallross420]

@@ydvisual5530 idk, I was wondering how centrifugal force would affect rain and clouds, if it is indeed big enough to have its own weather

[@ydvisual5530]

@@randallross420I will try to make a simulation soon!

[@ydvisual5530]

@@randallross420Also, hey! thank you for subscribing !

[@randallross420]

@@ydvisual5530 for sure, i like this kind of stuff.

[@m0rjc]

If you're standing on a spinning object and move, do you experience Coriollis Effect and how much?

[@ydvisual5530]

Yeah i think somewhat - depends on the radius i think

[@JFrazer4303]

Hardly any at all for this size.

[@MichaelSkinner-e9j]

If you wanted to launch a Cylinder, You Could Just launch one from another with Oxygen Expansion, then pouring Hydrogen inside to Ignite it, pushing off from the other.

[@MaximusCaesar632]

When can we build this?

[@ydvisual5530]

Everybody down for meeting this weekend and getting a start on this? Who's in ???

[@MaximusCaesar632]

@@ydvisual5530 as long we have the money and the get a lease for launch site for launching rocket and get the blessing from the government, I’m in.

[@k.a.p.x3642]

500 years from now

[@MaximusCaesar632]

@@k.a.p.x3642 too long. 😅😅

[@k.a.p.x3642]

@@MaximusCaesar632 Untill we finally make room temperature superconductor, graphene and carbon nanotubes and find a way mass produce them, this will be too difficult to make. We can make smaller versions of this though.

[@Astromath]

It's a great visualisation! I'm wondering how you arrived at 2.8°/min though. Shouldn't it be -0.91°/sec- 2.8°/sec

[@ydvisual5530]

Thanks! Yeah, sorry about that - I corrected that in the description and set to 2.8 deg/sec (I thinks that the right math - I gotta check again, i forgot the numbers lol)

[@Astromath]

@@ydvisual5530 Oh yeah I didn't check the description But acceleration should be a = ω²r So ω = sqrt(a/r) = sqrt(9.81m/s² / 4000m) = 0.0495 rad/s 0.0495 rad/s = 2.84°/s Apparently I also made a mistake

[@ydvisual5530]

@@Astromathcool thanks for checking that; I just vaguely remember 1.0g at the outside radius haha

[@CodyvBrown]

let's build it

[@ydvisual5530]

OK! I will go to home depot tomorrow and prepare haha. Hey - this video just a surge of viewers, may I ask how you found this video ?

[@centaur1a]

After awhile. This world can become boring. No sky or stars to look at differently. O’Neill colony there be three giant glass / mirrors that who let in some lights from outside, but at night the cylinders would be closed. This kind of reminds me of “Roundevous with Rama”

[@ydvisual5530]

true!

[@JFrazer4303]

Windows looking out into space are not possible, because they'd be straight paths in for cosmic rays, which the 1.6meter concrete hull is needed to stop. A few miles of atmosphere is nothing to galactic cosmic rays which can be nuclei of iron atoms stripped of electrons, at 90% of light speed. O'Neill did not suggest his huge cylinders as real prospects, and they were sketched out before the really detailed studies had been done. See his later 800 meter diameter "Island One" sphere (incorrectly called a Bernal sphere), or the NASA Ames "Stanford Torus" with mirrored baffling to allow sunlight in but block cosmic rays. Sunlight can be concentrated into small apertures, so you'd see very bright light emitters overhead. It's not clear how all this would be done to have real warm bright Sunlight, but it's not clear how artificial light could be anywhere near as effective as just managing Sunlight directly. Today, reflected Sunlight piped into big buildings allow warming filtered Sunlight to rooms inside.

[@MrRolnicek]

Your video says 2.8 degrees per minute which is very wrong. It SHOWS the correct speed of rotation (it seems) but the text says 2.8 degrees per minute. At least the description says 2.14 revolutions per minute. Strange that the mistake wasn't just replacing degrees with revolutions though.

[@kemmerer]

For a cylinder with a radius of 3.98km and a centrifugal gravity of 0.97g, the spin rate is 2.801 degrees per second.

[@MrRolnicek]

@@kemmerer ok, was wondering ... then the animation is wrong (or not clear enough that it's sped up a LOT) AND the video description is ALSO wrong. Was wondering if I should do the math and see which of the 3 values in this video are correct if any but decided meh, saying something and getting corrected is the easierr way to do it.

[@kemmerer]

@@MrRolnicek Ken York has accidentally replaced 2.8 degrees per second with 2.8 degrees per minute in the caption. An easy mistake to make.

[@ydvisual5530]

Yes, my bad - it should say: "2.8 deg/sec" NOT "2.8 deg/min" - sorry!

[@jhwheuer]

Huge, and still tiny compared to an O of the Culture…

[@therearenoshortcuts9868]

how many people can it hold? assuming regular farming community

[@ydvisual5530]

Only eight people. If there are nine, number 4 will kill number nine, which will cause number 3 to have doubts about the whole thing.

[@islandpalm148]

On the upper end, 8-10 million theoretically. I doubt anyone would want a single habitat that large though, since you can have as many as you want with lower, more manageable populations. These habitats would be built in pairs, counter-rotating to prevent a wobble that would lead to incorrect orientation to the sun.

[@joelcarson4602]

Giant agricultural cylinders with farmers. Amish in Space! I think it was National Lampoon had a comic strip about that in their "Science Fiction" issue back in the 1970s. The issue's cover painting was by Frank Frazetta of a four armed kind of reptilian alien being crucified on an "X" shaped cross. Great issue.

[@patrickunderwood5662]

Did you mean 2.8 degrees per second?

[@patrickunderwood5662]

p.s. love the video, just asking the question.

[@patrickunderwood5662]

OH DUH I JUST SAW THE TEXT

[@ydvisual5530]

Yeah sorry about that - I should have double checked before posting it haha

[@clpfox470]

Hypothetically speaking, how much damage would this do if say you..... i dunno dropped it from orbit. Again Hypothetically say on Brazil, no reason, im just you know asking for a friend

[@ydvisual5530]

hahaha - when I read this comment I laughed coffee out my nose - now it hurts lol

[@michaelt1775]

Good luck sourcing all the material to build it😂

[@krystiansieminski8060]

So this dimensions with 1full rotation per 1 minute would give on the edges surface a stable .97% of 1G force. We have things that in fiber strength could take abuse to 11km so 8km in D is doable , we could build it now, so why wait?...... ah we have no need for it. TH

[@dsm3759703]

How long did it take to build the Sears Tower? How many people worked on building the Sears Tower? How Much did it cost to build the Sears Tower? (3 years. ~2,000. ~1,000,000,000 USD.) Now multiply this by say....10,000? Oh, and do it in space. Wanna run the numbers for what it takes to launch even 3 people plus maybe a couple tons of cargo into LEO? (google answer: $10-400M USD.) Good luck. This never gets built outside of a sci-fi scripts. It's cool though. And fun to dream.

[@GAMEMASTERTHX]

No Gundams?

[@ydvisual5530]

OK I will add Gundams next time!

[@seththebeatmxchine]

I feel this would take up so much of Earth's resources it would speed the Earth's rotation up or something. Like idk if it would even be possible. I guess that's what galactic mining will be for 🤷‍♂️

[@nuclearnuclear8101]

Imagine dropping this baby into earth

[@ydvisual5530]

OH YEAH haha

[@JFrazer4303]

A silly carton idea, when there are plenty of rocks which would be easier and more effective.

[@Infinityfields]

Not to be negative, but this design seems a bit too far fetched. There is no support in the middle of this structure and the spinning could cause the stress on the middle to bulge outward or even fail. If this is to be built then it needs to have structure and support and the best way to do this is making sections that are joined together. 32km long should be broken down into 6 sections that are say 5km long and two end sections that are 1km long each. In each section you will have structural tubes that support the main body but also give access to the center tube where weightless production jobs can be performed. Also this video has not shown this yet but i feel all living units should be below the surface and each unit will have a video wall showing a view of outside or of a location on earth. Last thing is something this massive will need a different material to be built out of other than steel. Carbon nano tubes yes but we need to really advance for that to be done. Oh yeah, these could be Arks for humanity to spread to the rest of the solar system and then ultimately to the Stars ✨

[@stevewilson5546]

Calculate the pressure on the cylinder at 10.2 psi. It is beyond the capability of any metal. Your idea is fantasy.

[@zoltanmeksz7625]

This is not a good concept. A single meteor impact would endanger the existence of the entire colony. We need a structure that is cylindrical for the sake of artificial gravity, but it is not an entire air space, but a cell-like structure, 100% airtightly isolated from each other and there is a loose, easily separable connection between the cells. Thus, if a meteor hits or any kind of explosion occurs, it endangers only those cells that are affected by the disaster. The other cells escape with earthquake-like oscillations. It is important that the connection between the cells is loose, so that the mechanical energy is absorbed by the loose connection.

[@peeperleviathan2839]

Put some armor around it and lasers for deflecting/vaporizing dangerous objects

[@addhoardingprocrastinator]

I'm guessing if they really want to build this, they are going to have to go to the asteroid belt and find the materials they need there. Cause removing this much material from earth is certainly going to change something of geodynamics of the planet.

[@ydvisual5530]

It is indeed a lot of stuff haha

[@craigcorson3036]

Very little actual information is presented in this video. I would like the last ten minutes of my life refunded, please.

[@ydvisual5530]

Thank you for the input, it was fun to make!

[@quepasa3365]

Sorry , this is not a realistic. Because of scale , it’d be far to costly to build , because of mass there would be no way to control speed and direction.

[@ydvisual5530]

Ok, fair enough - I will stop saving money for it. I was up to $750 already!

[@Cyberwar101]

You are incorrect. It is *currently* too costly to build. As for the control you are even more wrong. You simply need a sufficiently large source of energy. A few kilometers of thin mirrors would be sufficient to do stationkeeping, which is all you would need for such a structure.

[@HateBear-real]

>not scaling up automation in deep space >not building self-repairing, self-replicating machine grids >not mining the asteroid belt >not colonizing the inner solar system >not creating what amounts to a robotic trucker network >not using it to supply the new colonies and jumpstart new ones >not using it to fuel megastructures Why do people like this even bother commenting? Go back to your stone tools already. They're "realistic" lol.

[@islandpalm148]

The cylinders would be built in pairs, tethered and counterrotating to prevent wobbling, which would affect correct orientation to the sun. Locations would likely be orbits around the Lagrange points, which are gravitationally stable areas. You could string many of these habitat pairs in these orbits, necklace fashion. Minimal needs for stationkeeping.

[@JFrazer4303]

by the time anyone has a few generations of early space habitats built, and have been mining NEAs for several decades, what we think of as "cost" or "economics" is no longer relevant. The first of the early first generation habitats for 10k workers, if started in the late '70s, would have been done by 2005, for cost like the Interstate Highway System, or a few of our aircraft carriers, equipped to deploy. It would have ended wars for oil, or budget crunches, or scarcity of energy or raw materials of previously rare or "precious" metals. Any mass up to mountain-sized asteroids can be pushed with a whisper of effort up there.

[@markmarsh27]

Massive rotating Space Habitats will never be cylinders, no structural integrity - they'll be geodesic spheres, the bigger you build them, the stronger they become.

[@ydvisual5530]

That makes sense! I will try to build one of those next! Thanks for comment!