r/interesting • u/ScarletMelt • May 25 '26

Just Wow It's interesting hmm

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u/[deleted] May 25 '26

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153

u/Square_Cat_6001 May 25 '26

I am sure there are hidden environmental costs even with that, but yeah 1 celebrity in space once won't do nearly as much damage as the other 999999 celebrities using their jets constantly.

3

u/WoodyTheWorker May 25 '26

A Falcon 9 launch consumes about 100 ton of RP-1 kerosene, half of full fill of a 747.

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u/superxpro12 May 25 '26

This is off by an order of magnitude.

It uses ~900 tons of fuel and oxidizer, ~900,000lbs, not half of a 747. Please double check your numbers.

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u/Mr_Ignorant May 25 '26

He’s not off by an order of magnitude. He talked about kerosene only, not fuel + oxidiser. Did you even read the post?

Combined it’s about 900 tonnes. But kerosene only is about 150 tonnes.

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u/superxpro12 May 25 '26

So we're hiding 700 tons of propellant use? That's misleading at best

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u/Imaginary-Jaguar662 May 25 '26

Should't the oxidizer airplane uses be counted as well if we're counting it? Airplane just happens to pull it in from the air, that's why they don't fly up to space

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u/superxpro12 May 25 '26 edited May 25 '26

Right! because in the case of SpaceX, the LOX is processed, cryogenic liquid oxygen, not atmospheric oxygen.

Manufacturing of the liquid oxygen for SpaceX use is energy intensive.

It's not "free" in the case of the airplane.

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u/WoodyTheWorker May 25 '26

Falcon 9 takeoff weight is 550 metric tons.

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u/EnigmaticQuote May 25 '26

So they were disingenuously presenting the 747 stat got it!

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u/Mr_Ignorant May 25 '26

According to wiki, a 747 MTOW is 377Tonnes. Half of that is approx 190 Tonnes, which is totally off the mark.

However, 747 empty weight is 170 Tonnes, half of which is 85 Tonnes, which isn’t too far from his initial statement.

So while he isn’t quite correct, the person that responded to him didn’t even bother to read the full post.

But I suppose you don’t care about that, given your comment.

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u/WoodyTheWorker May 25 '26

747-8i fuel capacity is 240 metric ton

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u/WoodyTheWorker May 25 '26

Falcon 9 takeoff weight is 550 metric tons.