Whyyyy peter?

[u/chirantaniga]

[u/spotlight-app]

OP has pinned a comment by u/Spatula26:

And yet not one of them is from Mayor Adam West.

Idk about the rockets, but THAT part of the answer seemed like a lay up.

^{[What is Spotlight?](https://developers.reddit.com/apps/spotlight-app})

[u/UnlikelyIntrepid]

Launching near the equator provides a speed boost due to rotation that outweighs the benefits of starting higher up. It also doesn’t have the logistics nightmare of getting everything to the top of a mountain before launch. 

[u/loadnurmom → u/UnlikelyIntrepid]

This is the answer. Should be higher up.

To add on, many rocket pads are in coastal areas to avoid falling debris hitting populated areas in the event of a mishap.

Certainly not all, Roscosmos launches over land, but the population density is a lot lower (and....well...Russia)

[u/G-St-Wii → u/loadnurmom]

Higher up here? Where we are meant to be explaining a joke?

[u/mister_peeberz → u/G-St-Wii]

Higher up on a mountain, of course.

[u/DungeonsAndDradis → u/G-St-Wii]

Why don't they comment closer to the middle of the post so that there's a speed boost?

[u/Akussa → u/loadnurmom]

This is the answer. Should be higher up.

Unlike the rockets!

[u/hedrone → u/UnlikelyIntrepid]

Best described in https://what-if.xkcd.com/58/ .

"The reason it's hard to get to orbit isn't that space is high up.

It's hard to get to orbit because you have to go so fast."

Putting rockets on mountains only helps with the "up" part, which is not the biggest part of the problem.

[u/jmlinden7 → u/hedrone]

It helps with the speed part too. Less air resistance and very slightly less effective gravity.

[u/AutonomousOrganism → u/jmlinden7]

Eh. Gravity reduction on a mountain is like 0.2 percent. Air resistance matters a bit more. But all of those are drowned by the energy needed to reach orbital velocity.

Much more interesting would be an electromagnetic launcher up a mountain, getting the rocket to 1 km/s or so. Although I am not sure the logistics are worth it. You could just use more fuel instead (what is done irl)). Fuel is cheap.

[u/PerniciousSnitOG → u/AutonomousOrganism]

It's weird, but things seem to be converging. I was reading something this morning talking about the Starship problem of getting enough fuel in the ship once it's in orbit to get to Mars. It suggested that there would be lots of Starships carrying nothing but fuel into orbit, but it seems like a perfect job for the spin launch people! They should be able to achieve an impressive "launch" cadence that's needed for really doing things in space.

[u/Downtown-Act-590 → u/UnlikelyIntrepid]

That is indeed true, but nowadays a ton of satellites are on polar sun synchronous orbits and there the speed boost doesn't really exist. That is why you have space ports in places like Saxavord or Esrange, which are extremely northern. So it is definitely not the main reason.

Moreover, the benefits for starting higher up are visible. Primarily, because you leave vast majority of atmosphere below you and with it aerodynamic forces and drag. That is one of the reasons why you have several air launched vehicles like the Pegasus.

That said, the logistics are indeed quite extreme at this point. It does not mean that it isn't possible option in the future though.

[u/Icy_Concern_9804]

tl;dr: for a rocket it is waaaay more important to go fast than to go high. and earth rotates very slowly, so going higher doesn't make you much faster.

[u/Maephia → u/Icy_Concern_9804]

So would it be theoretically easier to launch rockets at the equator since that's where the spin is the fastest?

[u/Triqueon → u/Maephia]

Yes, which is why the American Spaceports are in southern states, and the ESA launches from French Guiana.

[u/descisionsdecisions → u/[deleted]]

I would assume they are flying polar orbits where the extra speed from the equator is detrimental.

[u/_okbrb → u/descisionsdecisions]

Yes, it’s this

The dV bonus they lose at launch is gained back in savings from the less extreme plane change maneuver

Polar orbits are commonly used for imaging satellites

[u/Lithorex → u/_okbrb]

The dV bonus they lose at launch is gained back in savings from the less extreme plane change maneuver

In a polar orbit this isn't even free dV. It's unwanted sideways momentum.

[u/Purple_Clockmaker → u/_okbrb]

I'm imagining satellites and I'm on the bus right now. Going to polar orbit is a waste of time.

[u/QueasyNart → u/Purple_Clockmaker]

I can understand how putting a bus into polar orbit would be a waste of time, but why the hell did you do it at all?

[u/Thea-the-Phoenix → u/QueasyNart]

It was Ms. Frizzle's bus. She just wanted to do something cool.

[u/chicojuarz → u/Thea-the-Phoenix]

did the parents even sign permission slips for that

[u/IBreakCellPhones → u/_okbrb]

There's also not much land south of the Kodiak Spaceport other than Hawaii and Antarctica to have rocket bits fall on. That's also why most of the US polar launches are from Vandenberg SFB. Polar launches from Cape Canaveral are doable but difficult and restricted. You have to thread needles between islands. Starbase Texas has too much land north and south of it. Starbase Louisiana might be able to do it, but Mexico won't be too happy about it.

[u/PewPewsAlote → u/[deleted]]

Not all satellites desire an Equatorial orbit (An orbit that follows the equator). There are many other orbital inclinations that may be desired, to reach them it would be more efficient to launch from a more advantageous location on earth. Its more fuel efficient to launch from a location that is slower but closer along your desired orbit rather than to launch from the equator and then perform an extremely expensive correction burn.

[u/Icy-Ad29 → u/[deleted]]

Because having it quickly wind up over water rather than populated land is a common requirement, and the convenient places you can do this with enough fairly-flat space for a pad, near the equator, are rapidly running out...

So you make a smaller pad for lower orbits that require less speed, farther north/south.

[u/Sufficient_Risk_8127 → u/[deleted]]

chads

[u/CrashNowhereDrive → u/Triqueon]

Not just because of that. It's because there's a coastline there - rockets want to launch over water - and because it's the only reasonable way to get to lower inclination orbits. Low inclination orbits are better to go to things like geostationary , to the moon, to the plane of the ecliptic in the solar system.

[u/MKBRD → u/Maephia]

Don't they already do that?

Or near to the equator, at least.

[u/Enaciann → u/MKBRD]

They do!! At least SpaceX and the ESA does :) (both are near Cap Carnaveral !)

[u/brusk48 → u/Enaciann]

Baikonur is also pretty far south in terms of the USSR

[u/m50d → u/brusk48]

And Tanegashima is pretty far south in Japan.

[u/hwc → u/brusk48]

and there is a good reason Russia didn't move their launch facility back to Russia after the breakup of the USSR

[u/KebabGud → u/Enaciann]

ESA launches from French Guiana which has the launce site that sits closest to the equator.

SpaceX launch from Cape canaveral, Vandenberg and Brownsville, with the last one beeing the southernmost launchsite in the US

[u/meadbert → u/Maephia]

Yes. Countries already do that. It is one reason the US launches from Florida, Texas and Southern California, and Russia launches from Kazakhstan.

This actually makes Russia's early lead in the space race all the more impressive.

Starting at a higher altitude also helps, but you must transport the rocket to that altitude or assemble it there and both are difficult. Launching from the coast lets you use barges to transport rocket parts. If you don't have access to waterway, then a railroad is your next best bet and running railroad tracks to the tops of mountains is not ideal.

Finally, some rocket launches fail. If you start at the coast you can launch over an ocean so if things go wrong the rocket crashes into the Ocean rather than hitting a populated area.

[u/Mnementh85 → u/meadbert]

also rocket launch are heavily dependant on weather.

and there is hardly worst places than mountain to get stable weather

[u/ObsidianDart → u/meadbert]

Can't imagine that top of mountain is actually better logistically. You save some rocket fuel since you have less air drag to go through, but I can't imagine those cost savinga make it worth all the troubles and costs you'll have setting up and launching from there.

[u/British_Rover → u/Maephia]

Yes. That is why the US launches primarily from Florida and SpaceX launches down near Brownsville Texas.

Belize is also a spaceport for France and the ESA.

Closer to the equator the better.

[u/euph_22 → u/British_Rover]

"Belize is also a spaceport for France and the ESA"

I believe you're thinking of the Guiana Space Center in French Guiana: https://en.wikipedia.org/wiki/Guiana_Space_Centre

[u/British_Rover → u/euph_22]

Ah yeah you are right my bad. I should know better. I had a roommate in college from French Guiana.

[u/Aegi → u/British_Rover]

It is also just more logical to assume that even if you didn't know, because French Guiana is part of the EU as it is just a French territory.

[u/Much-Jackfruit2599 → u/Aegi]

and not just a territory in the US sense, but totally french, their own department like the 100 others.

[u/Federal_Studio5935 → u/Maephia]

Yes.

[u/Top_Championship8679 → u/Maephia]

ESA launch site is French Guiana

[u/gbroon → u/Maephia]

Depends on the orbit your aiming for. Sometimes closer to the poles has benefits.

[u/Halikarnassus1 → u/Maephia]

They do that but it's not because it's where the spin is fastest it's because the closer you get to equator the less you need to burn after getting to orbit to turn it equatorial

[u/pat34us → u/Icy_Concern_9804]

Not to mention that where they have the launch pads currently the weather is far more consistent. Image waiting for the weather to be just right on the top of a fricken mountain

[u/theobashau → u/pat34us]

Yeah, I was just immediately reminded that part of the reason for the Challenger crash was how cold it was that day

[u/ResidentBackground35 → u/Icy_Concern_9804]

Isn't there a atmospheric thickness component as well? Or am I crossing wires?

[u/Opus_723 → u/ResidentBackground35]

Yes, launching from mountains would actually be nice because of the thinner air. The real reason is just that there are more important things that matter in choosing a launch site and everything is a compromise.

[u/H_Industries → u/Icy_Concern_9804]

"Slowly" is relative, at the equator the earths surface is rotating at about 1000 mph. LEO orbital velocity is about 17,500 mph, so you're about 6% of the way there compared to if you were launching at the poles.

edit: I'm not sure if 17,500 is absolute or relative to the earths surface, but the point remains that you get about 1000 mph of free velocity from the earth spinning at the equator vs the poles. if its relative, then its a 5.4% gain vs the 5.7% so still significant

[u/rysy0o0]

It would cost a lot of money to haul all the rocket parts and fuel on top of a mountain

[u/Flat_Lengthiness3361 → u/rysy0o0]

and a lot of fuel probably

[u/thebestoflimes → u/Flat_Lengthiness3361]

Just use Sherpas

[u/CormundCrowlover → u/thebestoflimes]

It would cost a lot of Sherpas.

[u/WiseWorldliness5513 → u/CormundCrowlover]

Have we tried giving the Sherpa’s rockets to help them move things faster uphill?

[u/CormundCrowlover → u/WiseWorldliness5513]

But wouldn't it cost a lot of fuel?

[u/sivartimus → u/CormundCrowlover]

Yes but we have Sherpas for that

[u/NotGonnaRage → u/sivartimus]

With rockets so it's faster

[u/oryx_za → u/NotGonnaRage]

Have we just solved unemployment in nepal?

[u/Acceptingoptimist → u/oryx_za]

It's the perpetual motion machine right under our noses.

[u/LitigiousLobster → u/oryx_za]

But now all the rocket scientists are unemployed.

[u/MWSin → u/oryx_za]

I think we solved population in Nepal.

[u/SaltyPressure7583 → u/oryx_za]

Unfortunately i think Nepal just sorted that out yesterday. Rip

[u/PineappleShard → u/sivartimus]

Sherpas all the way down.

[u/sabotsalvageur → u/PineappleShard]

What is propellant if not a constant stream of microscopic sherpas being dispatched in the direction opposite the rocket’s intended thrust vector?

[u/MadDocHolliday → u/sabotsalvageur]

Mitochondria is the powerhouse of the cell. Sherpas are the powerhouse of the space program.

[u/Icy_Transportation_2 → u/sivartimus]

It’s clear you haven’t studied sherpa technology

[u/Twitchmonky → u/sivartimus]

Rocket powered sherpas

[u/Born_Consequence3025 → u/Twitchmonky]

Sherpa powered rockets, actually

[u/jakeStacktrace → u/sivartimus]

I'm sorry I had already forgotten, I know we just went over that. Implement it.

[u/mwadeeeb → u/sivartimus]

They have what plants crave

[u/Dozer_the_Khajiit → u/sivartimus]

Sometimes reddit sucks.

Sometimes it's kind of awesome.

[u/rockysworld → u/sivartimus]

Sherpa powered rockets

[u/db720 → u/WiseWorldliness5513]

We should train them

[u/ChronoMonkeyX → u/WiseWorldliness5513]

God bless this rocket house and all those who dwell within this rocket house.

[u/Weaselbrott → u/WiseWorldliness5513]

They apparently just need cigarettes?

[u/Dooku17 → u/CormundCrowlover]

This made me laugh more than it should have😂

[u/CormundCrowlover → u/Dooku17]

Thx! Thanks for the award as well

[u/Vast_Interview3098 → u/CormundCrowlover]

Sherpas iiiiiiiinnnn spaaaaaace

[u/luxcity-louche → u/CormundCrowlover]

[u/EmuAce → u/CormundCrowlover]

Sherpas are technically a renewable resource - so that's ok

[u/Otherwise_Demand4620 → u/EmuAce]

... it's just boiling water again, isn't it? beautiful clean sherpas.

[u/bbbourb → u/CormundCrowlover]

LOL...Sherpas as currency?

[u/Flimsy_Mountain_3721 → u/thebestoflimes]

Bypass the rockets and just use Sherpas to deploy into low earth orbit

[u/Sunhating101hateit → u/Flimsy_Mountain_3721]

Soooo… could a Sherpa Railgun work?

[u/SeesawDelicious4677 → u/thebestoflimes]

Or rockets

[u/AtlanticPortal → u/thebestoflimes]

Llamas?

[u/SethSlax → u/AtlanticPortal]

Llama? He's supposed to be dead!

[u/Nkfloof → u/SethSlax]

Yeah, weird.

[u/Thin-Hat-9037 → u/Nkfloof]

Let me see that vial

[u/ATX2ANM → u/AtlanticPortal]

With rockets. Rocket llamas.

[u/Apprehensive-Taro707 → u/AtlanticPortal]

Dalai Lama can do it. But he won't help Chinese Rockets.

[u/Overall-Mycologist-5 → u/thebestoflimes]

it's dangerous, I think sherpas are so tired of rich mf showing off by climbing some hill, so at first possibility they will hijack the rocket and run to Mars

[u/Wild_Smurf → u/Overall-Mycologist-5]

Jokes on them. It’ll only be a matter of time until someone tries to follow them to mars to climb Olympus Mons.

[u/johnaross1990 → u/Overall-Mycologist-5]

I dunno man, I bet it’s a pretty lucrative racket.

There’s no shortage of rich pricks desperate to queue in the death zone so they can can take a picture.

And Sherpas have the business on lock. Who else can portage an ailing “mountaineer” on their back, at 8000m?

[u/Xelikai_Gloom → u/Overall-Mycologist-5]

I can get a sharpa to carry me up Olympus Mons? Say less.

[u/LloydIII → u/thebestoflimes]

DYK. Sherpa is an ethnic group. Not an occupation.

[u/daspowerhouse → u/Flat_Lengthiness3361]

To be fair, it’s not the cost of the fuel itself that is an issue for rocket launches, just that so much of it is required, and it adds so much weight to the rocket. Fuel is less than 1% of the cost of a rocket launch, yet typically over 90% of the mass of the entire launch. If you could somehow spend fuel on the ground moving things to an optimal launch point to have to put less fuel in the rocket, it would absolutely be worth it.

The real issue is that launching from a mountain would not save you much fuel anyways. To get to orbit requires you to go very fast sideways. The initial “upward” part of a launch is just to get past the thickest part of the atmosphere, then it quickly pivots sideways for the majority of its journey.

You save more fuel by launching from a lower altitude closer to the equator, where you can take more advantage of earth’s spin to gain additional sideways velocity. So we do spend a lot of fuel to do this, for example SpaceX manufactures their rockets in Hawthorne, California, where there is a lot of aerospace manufacturing expertise, and spends a lot of fuel to ship them to Cape Canaveral, Florida, which is closer to the equator.

[u/The_sochillist → u/daspowerhouse]

What about launching from a mountain on the equator like Mt Chimborazo which is the farthest point from the centre of the earth so wins on all fronts

[u/dimhue → u/The_sochillist]

The radial difference between equatorial sea level and the peak of Mt Chimborazo is about 0.1%. It provides very little benefit but would be a logistical nightmare to launch from.

[u/aggressive-cat → u/dimhue]

We'd be better off building a electromagnetic launcher up the side of it and then we can put everything at the bottom and save fuel by using solar wind and nuclear to juice the em rails.

[u/awesomefutureperfect → u/aggressive-cat]

You'd have to engineer the payload to withstand ridiculous acceleration. No big deal if the payload is a HILE projectile but if you have living things or moving parts, that can be trickier.

[u/Chill-more1236 → u/daspowerhouse]

SpaceX is putting a launch site in South Louisiana for the same reason. There is also an advantage of movement of parts by water, from either the Mississippi, through the Panama Canal, or down the East Coast.

Pretty sure yall know our reputation for flatness and sea levels. Solid rock and high ground is pretty much non existent, in most of the state. Our only "mountain" is something like 300ft.

[u/virgil1134 → u/Flat_Lengthiness3361]

There a lot of logisitical reasons, like transportation to the top of the mountain, fuel, bad weather, high winds, all the support strcutures beyond the launch pad, and what happens if something goes wrong and you dont have a big open ocean for falling debris.

I suspect OOP belives the increase in height is beneficial, but even if we built a launch pad on Mt. Everest, it would be neglible. The Earth has a 4,000 mile radius, and Mt. Everest is only 6 miles high, a diference of 0.15%.

The biggest reason for our launch pad sites is escape velocity. On Earth, you need to get to 25,000 MPH to get into orbit. As our flerfy friends like to point, the Earth spins at 1,000 MPH, but that is only at the equator, where all the launch pads are. As you travel to the poles, that rotational velocity goes down until it goes to 0 MPH at the poles. If you need to get to orbit, get a running start at 1,000 MPH gets you 4% of the way there, a significant savings in fuel.

At fhe end of the day, a rockets mass is 90% fuel alone, 5% is the rocket shell, and 5% is the payload. so any savings that can be achieved on fuel is signficant.

[u/mean11while → u/virgil1134]

The radius of Earth is completely irrelevant. The problem is the dense portion of the atmosphere near sea level, which prevents a rocket from rolling over and dumping its energy into horizontal motion. The atmosphere at the top of Everest is about 35% as dense as the atmosphere at sea level. Everest is also closer to the equator than Cape Canaveral.

If it was logistically possible to launch from Mt Everest, it would definitely be worthwhile. Between reduced drag, earlier gravity roll, and improved specific impulse, I think it would save about 300 m/s to LEO, plus whatever advantage the ISP provides. The rocket equation being certifiably nuts in its exponentiality, that's about a 12% reduction in fuel required at launch.

[u/Khelthuzaad → u/Flat_Lengthiness3361]

we could use trains,electric ones

But most importantly metal and electrical components do not fare well at -20 degrees Celsius

[u/schizeckinosy → u/Khelthuzaad]

Or o-rings

[u/Azurhalo → u/schizeckinosy]

Maybe we can use sherpas.

[u/Apprehensive_End8318 → u/Azurhalo]

Then the o-rings will be out of a job

[u/Shouleyy → u/Khelthuzaad]

But arent they designed to be in space? isnt it way colder there? Well tbf i guess only half the rocket really reaches space

[u/Greedy_Birthday_3494 → u/Flat_Lengthiness3361]

certainly. This is a big problem, transporting fuel can lead you to lessen the efficiency of the fuel (you need too much energy to transport it compared to what it gives).
One of the reasons why the green hydrogen technology is not working as desired.

[u/October_Guy → u/Greedy_Birthday_3494]

Just fly a rocket up to the mountain to deliver the fuel to the other rocket.

[u/Earnestappostate → u/rysy0o0]

Plus, you get a better boost by launching near the equator. Height is easy, speed is what you need in a rocket.

This is why the US launches from Florida:

• Near equator (speed boost from earth's spin)
• Initially out over ocean (catastrophic failure harms only those aboard)

[u/EasyScratch1501 → u/Earnestappostate]

That's clever. Whoever came up with that must've been some kind of rocket scientist 

[u/stevenmc → u/EasyScratch1501]

It's not exactly brain surgery, now is it?

[u/EromanticDream → u/stevenmc]

Rocket surgery

[u/VaporTrail_000 → u/EromanticDream]

Brain science.

[u/Jaymark108 → u/VaporTrail_000]

Brain science gave me a headache

[u/BearForceOne_ → u/EromanticDream]

[u/blueiron0 → u/EromanticDream]

I've flubbed "Rocket science" as "rocket surgery" at least 10 times in my life, and reading this comment brought them all back into my brain at once.

[u/joshuahtree → u/blueiron0]

Just don't forget, everybody else remembers too

[u/FlyingSpacefrog → u/blueiron0]

A rocket scientist is the guy who sits at a desk and makes the blueprint, or plans the trajectory and launch dates. A rocket surgeon is the guy who walked up to the thousand tons of highly combustible liquids in a fully fueled SLS to diagnose and repair a faulty valve minutes before launch.

[u/residentweevil → u/blueiron0]

I do it on purpose, everytime I have occasion to use the phrase. Dad jokes: covering stupidity with grin since the dawn of time

[u/218administrate → u/stevenmc]

One of my favorite skits.

[u/iwilldeletethisacct2 → u/218administrate]

That feeling when you already know what the punchline is and you're just waiting for the delivery.

[u/stupidillusion → u/iwilldeletethisacct2]

"Oh Jack, they keep you late at the space center?"

[u/bradpittisnorton → u/218administrate]

For the uninitiated.

[u/Dismal-Vanilla1878 → u/EasyScratch1501]

Ya, Ya, Mein Freund, Ze Vere Rocket Zientist.... 😂

[u/Peterh778 → u/EasyScratch1501]

Well ... Jules Verne put his Columbiad gun in Florida before the rocket science really launched 😉

[u/MattBe92 → u/Earnestappostate]

That's also why the European space port is in French Guinea.

[u/BusinessTune2973 → u/MattBe92]

*Guiana

[u/MentalPlectrum → u/Earnestappostate]

Yes, but also there are equatorial mountains... checkmate rocket scientists!

[u/Scuttling-Claws → u/MentalPlectrum]

Exactly. Porque no Los Dos

[u/AliasClimbs → u/Scuttling-Claws]

Exactly what I was thinking of. Ill be climbing it in a few months. Ill bring an Estes model rocket set up with me For Science.

[u/jweezy2045 → u/AliasClimbs]

The answer here is that yes, launching from high altitude as well as launching from the equator are both benefits. Its just that the cost of moving a rocket up a mountain, or to some other country, ends up being more hassle than just doing it wherever is easiest/safest. Its just a marginal reduction. I don't have the numbers on exactly altitude, but I remember something about "Why don't we build a mile deep tunnel, and shoot space ships out of it like a gun" and the answer was something like "Sure, you can get a boost in efficiency and payload if you launch start instead of stationary start, but its like 1% more payload, and you had to build a mile deep hole that somehow shoots rockets in order to get it, so its just kinda a nonstarter of an idea."

[u/Thejacensolo → u/AliasClimbs]

Getting all touchy with the "equatorial bulge" i see

[u/ADHDebackle → u/MentalPlectrum]

Which also gives you more speed than sea level at the equator.

[u/thepkizzle → u/ADHDebackle]

The speed boost between Nepal and Florida is very minimal, but then the height difference is also very minimal because the equator is a mountain. How different? South Florida is .1% "shorter" than Everest and only about .5% rotationally faster. That's significant to be sure but it's more a product of "having both."

Neither are that important in a vacuum, the ease of getting supplies into a coastal location and launching east over the water is the real strategic reason.

If the location really truly mattered and if rotation was that important than we would be launching from Alacantra, Brazil, which is only like .06% shorter than Everest, but 13.7% faster rotationally, and 13.1% faster than Florida. The rotational speed is important, but everywhere on earth is moving but the further north or south you go the speed becomes more and more apparent with places in Florida being 40% faster than many parts of northern Canada. Nepal is actually really close to the equator.

[u/Eagle4317 → u/MentalPlectrum]

Not in America. You’d have to launch in the Andes or East Africa for that, and it’s safe to say that those places don’t have the infrastructure

[u/kirfkin → u/Earnestappostate]

Elevation would technically make things a bit more efficient, assuming they're near the equator. However, the speed boost significantly supersedes any effects from elevation.

It's also not feasible to get launch vehicles up a mountain of significant elevation anyway. Small gain versus very big cost, compared to building and transporting on a flatter, lower area relatively close to the equator.

[u/kioshi_imako → u/Earnestappostate]

True and technicly one of the main reasons we never used a rail boosted launch system you need 5km minimum to reduce fuel 30% and I think it was 25km to safely reach escape velocity via rail,

[u/Lithorex → u/Earnestappostate]

That's only true if you want to go into an equatorial orbit.

If you want to go into a polar orbit you'd need to cancel out all that sideways momentum.

[u/Roflkopt3r → u/Earnestappostate]

And we know the escape velocity for launches from different altitudes.

1. Launch at sea level: 11.186 km/s

2. From the top of Mt Everest (8800 m): 11.178 km/s

So even if we used the largest mountain on earth, we would only lower the escape velocity by around 0.1%. It's just not worth the effort.

[u/ObjectiveAide9552 → u/Earnestappostate]

Florida is also further from Earth’s center than most mountains that are further away from the equator due to the earth not being a perfect sphere. Not sure if that helps the rockets, not a scientist.

[u/aguysomewhere → u/Earnestappostate]

Launch them from Peru or Bolivia and you get both

[u/logothetestoudromou → u/aguysomewhere]

Dropping boosters deep into the Amazon going to freak out some undiscovered tribes.

[u/nerdherdsman → u/Earnestappostate]

The starting speed is less of a factor than the smaller required attitude change to reach an equatorial orbit iirc. The "free" delta v you get from the Earth's rotation at the equator is not that big compared to the delta v required to change orbital attitude.

[u/Believer4 → u/Earnestappostate]

Initially out over ocean (catastrophic failure harms only those aboard)

Even that's mitigated by the launch abort system, in the case of crewed launches

[u/Redditauro → u/Earnestappostate]

Also, ironically, being in the Equator also means that it's closer to space, as earth is bigger in the Equator than in the rest of the planet. 

The closest point to space is not Everest for that reason

[u/Secure_Courage7471 → u/Earnestappostate]

Also, warm. Cold isn’t good for a thing that’s about to be REALLY hot from friction. See: Columbus 

[u/Ok-Skilllevel-5056 → u/[deleted]]

We’ve summoned the king

[u/w8_wuht → u/Ok-Skilllevel-5056]

Nobody told me he was coming, I don't have tribute! 😭

[u/ChittaBhalu → u/w8_wuht]

Just pull your trousers down and bend over...

[u/w8_wuht → u/ChittaBhalu]

Dammit... Well, if it'll stop my village from getting avalanched...

[u/Prudent-Ad-5608 → u/ChittaBhalu]

Did someone say snu snu

[u/normal2122 → u/ChittaBhalu]

"oh no highking please dont use your mountain on me~"
why did I type that out 😞

[u/thetruesupergenius → u/Ok-Skilllevel-5056]

I didn't vote for him.

[u/TheOneWhoPunchesFish → u/thetruesupergenius]

You don't vote for kings

[u/IrksomFlotsom → u/[deleted]]

Username checks out

[u/samanime → u/rysy0o0]

And, it'd save us almost nothing (even if we had a magical teleporter that let us get everything up there insantly and for free).

Space is a minimum of 50 miles from "ocean level" (and really, it's 62, but let's say 50).

Everest, the tallest mountain, is about 5 miles above sea level.

So, even if we hauled everything to the top of the tallest mountain on the planet (which would be an insane to impossible amount of effort), it's only reducing the distance by less than 10%.

EDIT: Thank you to the 500 people that have told me "the distance barely matters". That is pretty much my point. YES, I know speed, and thus latitude are more important. My point is even if you ONLY consider the height, the thing the original question focused on, it STILL doesn't matter. When you factor in all the factors, it really, really doesn't matter.

I focused on the focus of the post in my response, not all of astronautical engineering.

[u/NerdyDjinn → u/samanime]

Unless you are doing sub-orbital flights, the height doesn't matter all that much. If you are looking for orbit (most space launches), speed is way more important than how high you start. Launching at the equator gives the highest starting speed, a far more significant savings in fuel. Now, there are equatorial mountains in the world, but as you say, you still have to expend the resources to move all the rocket parts and launch facilities up the mountain. It's easier to just build your rocket slightly bigger and use slightly more fuel to launch from a much more accessible and convenient location.

[u/Opus_723 → u/samanime]

Launching in thinner air actually saves quite a bit of fuel though, a lot of it is just spent fighting drag in the lower atmosphere.

The real reason we don't do this is just that there are like a dozen other more important things that make a good launch site and it's not practical to find a place that checks all the boxes.

You need to be close to the equator, directly west of a large body of water, governments want to launch in their own territory, etc, etc.

[u/FederalWedding4204 → u/samanime]

Except the lowest part of that 50 miles is the densest atmosphere. So lessening the distance by 10 percent is only some of it. The reduction in atmospheric drag is an entirely different beast

[u/Etherbeard → u/samanime]

Why don't we just make a rocket that's five miles tall? Best of both worlds.

[u/M0RT1f3X → u/rysy0o0]

And the weather is more extreme on mountains

[u/reverandglass → u/M0RT1f3X]

Finally! Here's me scrolling through hundreds of comments and no-one's mentioned the weather!
A normal winter frost doomed Challenger, I can't imagine trying to combat the winds and temperatures at those heights. Not to mention the snow.

[u/throwawaypostal2021 → u/rysy0o0]

My cousin can haul it all no problem.

[u/MINATO8622 → u/rysy0o0]

Also, the height boost is insignificant.

[u/IrritableGourmet → u/MINATO8622]

Shrunk down to the size of a bowling ball, the Earth would be much smoother than a bowling ball. Mountains are basically a rounding error in terms of spaceflight.

[u/enfersijesais → u/[deleted]]

Can you reinvent me a recipe for blueberry muffins?

[u/Dion42o → u/enfersijesais]

how do you know its a bot?

[u/enfersijesais → u/Dion42o]

Well… the bio asking you to click the link to chat 🍆💦😘, the wording of the comment. Makes no real sense. And the account is already banned.

[u/Uzi_Doormat → u/enfersijesais]

Classic Blueberry Muffins
Prep time: 15 minutes Cook time: 20–25 minutes Yields: 12 muffins
Ingredients
1 1/2 cups all-purpose flour
3/4 cup granulated sugar
2 teaspoons baking powder
1/2 teaspoon kosher salt
1/3 cup neutral oil (like canola or vegetable)
1 large egg
1/2 cup whole milk
1 1/2 teaspoons vanilla extract
1 1/2 cups fresh blueberries
Instructions
Preheat and prep: Preheat your oven to 400°F. Line a standard 12-cup muffin tin with paper liners or lightly grease it with non-stick cooking spray.
Mix dry ingredients: In a large bowl, whisk together the flour, sugar, baking powder, and salt until well combined.
Mix wet ingredients: In a separate medium bowl, whisk together the oil, egg, milk, and vanilla extract.
Combine: Pour the wet ingredients into the dry ingredients. Use a spatula to gently fold the mixture together just until the flour disappears. Be careful not to overmix; a few lumps are perfectly fine and keep the muffins tender.
Fold in blueberries: Gently fold the blueberries into the batter, taking care not to smash them.
Fill the tin: Scoop the batter evenly among the 12 muffin cups. They should be about 3/4 full.
Bake: Bake for 20 to 25 minutes, or until the tops are golden brown and a toothpick inserted into the center of a muffin comes out clean.
Cool: Allow the muffins to cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.

[u/boonmariachi → u/Uzi_Doormat]

Where are the chocolate chips?

[u/Radiant-You6384 → u/Uzi_Doormat]

⚠This user is suspected to be a part of an online terrorist organization.

well thats interesting! someone is a naughty boy

[u/poppycock_scrutiny]

Meg's twin here, rockets benefit from being closer to equator cuz earth has a bit more rotational energy that catapults said rocket with higher force, being on top of a few kilometres tall mountain won't matter much in the hundreds or thousands of kilometer of space travel, and it would be next to impossible to transport huge rockets to the summit of a mountain.

See it wasn't that hard to answer a genuine question but the oop's commenter chose to be a dick.

[u/Downtown-Act-590 → u/poppycock_scrutiny]

It wasn't that hard to answer, but this answer is not really correct either. 

It is nowadays extremely common to see satellites on sun synchronous polar orbits and the market for very high inclination launches is booming. These types of launches don't benefit from the equatorial speed up in any significant way and as such you see new spaceports opened up in places like Scotland, Sweden and Norway.

Moreover, the few kilometres definitely matter as on the summit of a large mountain. Vast majority of atmosphere is below you. The aerodynamic drag and forces are real. Typically, you can see ca. 30 to 40 percent of the first stage propellant spent only on the first 10 km of the climb. It is also the part of the flight with the highest loads, which determine the required strength of the launch vehicle. Not to mention significantly lower range of surrounding air pressure for which you have to optimise the nozzle.  There are massive benefits to launching higher and that is one of the reasons for several actual air launch projects.

That said, it is indeed logistically difficult, so we don't do it now. But far from realm of impossible or benefit-less and very much in realm of currently somewhat impractical.

[u/Plaeblius → u/Downtown-Act-590]

That's all true but the atmosphere isn't the reason so much fuel is burned early in ascent. The Saturn V only suffered about 40 m/s delta-v loss due to drag, which is a fraction of a percent of the necessary delta-v just to reach LEO. The thrust to weight ratio is just extremely low during initial launch so much of the fuel is just burned defeating gravity, and launching from a mountain won't noticeably change that (you're talking in the ballpark of a 0.5% decrease in g maximum).

[u/Vincent_Gitarrist → u/poppycock_scrutiny]

I understand why it's best to launch from the equator, but what does the equator have to do with mountains?

[u/Otherwise_Tomato5552]

I dislike when people answer this way. It’s a genuine, humble question.

No need to be mean

[u/PerniciousSnitOG → u/Otherwise_Tomato5552]

The really stupid thing is that honest, humble questions are the ones that drive useful discoveries. Thirty years in technology taught me that the right question, at the right time, is what makes the world go round.

[u/G-St-Wii]

The joke?

It's just someone being unhelpful.

[u/Augustby → u/G-St-Wii]

Yeah I hate that kind of reply. The person asking the question acknowledged that they’re ignorant about this topic, and the reply was basically just: “yeah you are”.

[u/Dead_Ass_Head_Ass → u/Augustby]

Ironically those answering the question in that manner don't know the answer either but are too insecure to ask the question themselves.

[u/brouuorb → u/G-St-Wii]

this is the answer to OP

[u/PoopsMcScoots]

The guy is being a dick for no reason.

And actually there ARE people suggesting to launch missiles from mountains.

[u/Much-Jackfruit2599 → u/PoopsMcScoots]

for war, yes

for space flights: they checked and discarded the idea. the gains that exit would be gobbled up by the logistical problems

[u/Alternative-Coach619]

Also like, even if it was free to haul the rocket parts up the mountain, the mountain at MOST is going to get you like, 2-3% closer to space which is very minimal and better to just launch it close to the equator like that already do

[u/CChargeDD]

Because its easyer to reach orbital velocity with a rocket than a mountain.

[u/The3mbered0ne]

The deltav (force needed to leave the atmosphere) #1 wouldn't meaningfully reduce it would actually increase vs launching at the equator because of the earths spin, but #2 would cost much more to ship and assemble, on top of electrical and fuel issues due to the cold it's just a terrible idea

[u/Yatsey007]

All the issues in the world and this is what Batman spends his time on?!

[u/Beanz_detected]

Moving anything up a mountain gets real expensive real fast because you're working against gravity the entire way. Yeah, theoretically it's more efficient, but the cost is just too much.

Roads and rail might not exist, or are just impossible to route up to the summit, leaving you with only aircraft, which still need an assload of expensive facilities to support it, and can't carry nearly as much weight.

NASA's Shuttle Carrier Aircraft can load 108,999kg, the shuttle itself weighing 78,000kg

The Falcon 9, probably the best analogue in modern day, weighs only 29,500 in comparison, not exactly something that can't be flown in, but allows us to do some calculations.

Assuming you're not planning on being able to make another attempt at landing (on a fucking mountain) you'd be carrying ~30,000lbs which we're converting to 13,608kg that's at minimum weight of 43,108kg assuming they're not carrying any other equipment, fuel, or otherwise.

Now if we did some calculations that I'm not good enough at researching to find, we'd find that jesus christ that's a big runway to be putting ON A MOUNTAIN

[u/doodullbop]

Not even considering the extra work needed to build launchpads on the top of mountains, it's like someone suggesting to park at the end of your driveway to save fuel on your daily commute. Rockets reach altitudes in the hundreds to thousands of km. Reducing that by a 3 or 4km is immaterial.

[u/ExpertEar699]

Equator is closest to space because Earth is not a perfect sphere instead it's bulged at the equator, same reason that mout Chimborazo in equator is closer to space than mount Everest in Nepal

Edit: I forgot that there isn't enough oxygen too for combustion

[u/raaneholmg → u/ExpertEar699]

> Edit: I forgot that there isn't enough oxygen too for combustion

Rocket Science is a BYOO party.

[u/ollervo100 → u/ExpertEar699]

I'm not sure if you are joking, but rockets carry their oxygen. Otherwise they wouldn't work in a vacuum.

[u/Abacada_Poln_Kha_Kha → u/ExpertEar699]

Nope, equator is best because earths rotation is faster there.