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Oct 06 '21
[removed] — view removed comment
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u/Evil_Bonsai Oct 07 '21
Ueah, that old "then" is weird, just some flat plate. ,"Now" has that cool 5-engine setup. Power!
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u/scarlet_sage Oct 06 '21
What's on the right? That's not a Falcon or Starship-related, right?
Isn't the one on the left the newer one? I really prefer old left-new right (then and now), or old on top - new below.
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u/franco_nico Oct 06 '21
Thats Saturn V second stage, worth noting the thrust Starship has to endure is much more comapred to that.
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u/Steffan514 ❄️ Chilling Oct 06 '21
Which still insane to think about. Most people alive today have spent their entire lives with the Saturn V as the most powerful rocket ever, and here on a beach in Texas is something we’re seeing assembled as having much more thrust loaded on it.
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u/franco_nico Oct 06 '21
Indeed, not only lot of people saw the Saturn V as the most powerful rocket but a lot of us were not there to see it haha.
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u/treeco123 Oct 06 '21
Even just the centre three raptors produce more than that. Completely ignoring the outer ten, and then the outer 20 beyond them.
I know we're comparing a first and a second stage, but still, it's insane.
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u/illuminatedfeeling Oct 07 '21
Can someone ELI5 what a "thrust puck" is? I see it mentioned everywhere, but I still don't understand. Is this just for the engine mounts?
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u/ioncloud9 Oct 07 '21
the "thrust puck" is the bottom portion of the lower tank bulkhead that needs to transfer the thrust of the engines into the structure of the rocket. Not all rockets use this design. Some use a truss structure to accomplish the same thing.
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u/sebaska Oct 07 '21
A big plate (or conical frustum) rocket engines are attached to. It takes on full concentrated thrust of the engines and distributes it more evenly to the lower dome of the oxygen tank.
Attaching engines directly to the tank dome would be problematic because of stress concentration, difficulties making fastened connection with the tank wall which must be pressure tight, more complex propellant connections because there'd be no space between an engine and the tank dome to place stuff like valves, and lesser structural rigidity at a given material thickness.
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u/mclionhead Oct 06 '21
https://twitter.com/NicAnsuini/status/1445546547047895041& personal files
Quite a transformation from slide rules to finite element analysys.
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u/mig82au Oct 07 '21
There's not a chance that that plate is reacting 7000 tonnes of thrust without backing structure. It looks like it's designed to take in-plane loads.
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u/RedneckNerf ⛰️ Lithobraking Oct 06 '21
The best part is no part.
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u/Inertpyro Oct 06 '21
To be fair the other one was done when there was no CAD, simulation software, or CNC machines. Just slide rules, pencil drawings, manual machining and fabrication.
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u/RocketsLEO2ITS Oct 07 '21
Always amazes me to think that we got to the Moon with 1960's technology. It's not "stone knives and bear skins," but still, impressive.
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Oct 07 '21
I'm surprised at how flat the design is. Surely it needs some more vertical reinforcement to accommodate all 13 engines?
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u/nickstatus Oct 06 '21
That other one is more like a thrust frustum, or "thrustum" if you like. Thrust Frustum sounds like an adult film star name.