Felimelinesk
17153
52
1
3 stages rockets: how it works
Apr 24, 2024 6:33 PM
Felimelinesk
17153
52
1
3 stages rockets: how it works
dudehiemer
*Jebediah Kerman liked that*
TheSlouchOfBethlehem
zentradipriminister
There's a beer commercial in this. It's right there!
DaDudeAbides
Needs elephants for scale
Felimelinesk
But where is the space frog?
RobJenkins
Mewmus
Wow.....havnt thought of those in decades
Morataya
thisisjunk
When you buy Wonka's Great Glass Elevator on Wish.
tiderfish
Is blue Hydrogen, and red oxygen? If so what is yellow?
SqueezitTheClown
I wanna say it’s solid vs. liquid fuels
ISofaKingWeeToddDid
Was totally expecting the Rick roll
skipweasel
It relies on the fuel being at the bottom of the tank to work. OK in gravity but without, you have to fire little rockets to slosh it all.
SqueezitTheClown
Wouldn’t the acceleration cause it to collect in the opposite direction of the craft’s momentum?
skipweasel
Yes. You shove the vehicle forwards, the fuel tries to stay still and ends up at the bottom of the tank.
Mohareb
Might be a stupid question but why don't they just make a piston pushing down from above? Seems it would be much cheaper and more simple than having to keep spending huge amounts of fuel just to be able to access the fuel <.<
sirava
Wouldn't really work. Bit complicated to go into here but imagine having a half empty soda bottle on its side where you try and use a piston to get all the liquid to one end. Short version, it won't really behave like you want it too. Plus it would weigh a lot. Some rockets pressurize the empty part of the tank with something inert like nitrogen, which is sort of acting like your piston.
skipweasel
True - but presurisation alone won't keep the fuel up the right end - it'll still wander about. You could enclose it in a balloon and pressurise outside it - that'd work. But mostly it's rockets. https://en.wikipedia.org/wiki/Ullage_motor
skipweasel
Partly because there's always some gas in there - and in zero g the gas forms a foamy slush - pressing down on it won't stop that, it'll just squash it up a bit. The bubbles will still be dispersed within the fuel. Turbo pumps really don't like bubbles in their feed - it breaks them. https://en.wikipedia.org/wiki/Ullage_motor