Post · 𑐴𑐶𑐟𑐶

Spaceflight 🚀 @spaceflight@spacey.space · 16 hours ago

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To get enough fuel ⛽ into #orbit for a #Mars 🔴 mission would require at least 10 launches of the #SLS rocket, or about $20 billion 💰. Just for the fuel. To use traditional propulsion, one needs to push the boundaries of #reuse ♻️ and heavy lift rockets to extreme limits—which is precisely what #SpaceX is trying to do with its fully reusable launch system https://arstechnica.com/science/2021/02/report-nasas-only-realistic-path-for-humans-on-mars-is-nuclear-propulsion

#SpacecraftPropulsion #reusability #LaunchCost

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Winchell Chung ⚛🚀 @nyrath@spacey.space · 12 hours ago

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@spaceflight

Yet again, journalists are confused over the difference between "fuel" and "reaction mass / propellant "

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Spaceflight 🚀 @spaceflight@spacey.space · 12 hours ago

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@nyrath I'm sure @sciguyspace will be delighted if you could enlighten him

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Winchell Chung ⚛🚀 @nyrath@spacey.space · 12 hours ago

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@spaceflight @sciguyspace

Choose one:

[1] they are unaware of the difference
[2] they know the difference but are trying to simplify it for their readers
[3] article was written by an AI

But in all three cases, instructions from me would be unwelcome

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Spaceflight 🚀 @spaceflight@spacey.space · 12 hours ago

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@nyrath you should better also inform them : "Liquid hydrogen is #NASA’s preferred rocket #fuel, and the new tank, together with the old one, will give the agency the capacity not only to accommodate the larger #fuel requirements of its new #SLS ... a lot of hydrogen is lost as it’s transferred from the rocket #fuel tank back to storage" https://spinoff.nasa.gov/NASA_Hydrogen_History_Informs_World%E2%80%99s_Hydrogen_Future

I suggest it's [2] 😁

Spaceflight 🚀 @spaceflight@spacey.space · 11 hours ago

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@nyrath and those : "highly refined kerosene formulations used as rocket #fuel. Liquid- #fueled rockets that use RP-1 as #fuel are known as kerolox rockets" https://en.wikipedia.org/wiki/RP-1

Winchell Chung ⚛🚀 @nyrath@spacey.space · 12 hours ago

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@spaceflight @sciguyspace

But if I did, I'd refer them to my explanation:

https://www.projectrho.com/public_html/rocket/misconceptions.php#notpropellant

A 𑐴𑐶𑐟𑐶 (hiti) is an ancient Newah urban water feature: a stepped, sunken courtyard with waterspouts and a central pool. These are fed through a remarkable network of pipes, reservoirs, and irrigation systems drawing water from mountain springs dozens of kilometres away. Every day, hundreds of people from the neighbourhood come to draw water, bathe, and exchange news. They are a unique and precious feature of Newa urban architecture through which neighbourhoods are created.

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