I’ve got to do a deep dive into the launch requirements of mission designs beyond LEO and compare F9 Arlas V 401, 551, FHeavy and FHeavy Expendable. I think a lot of people will be VERY surprised. Specific Impulse on the upper stage is everything.
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For full recovery to make sense over single stick expendable needs each booster to be reused multiple times. I’m also curious as to whether SpaceX would consider stretching Stage 2 if there was a market that made sense.
Under consideration. We’ve already stretched the upper stage once. Easiest part of the rocket to change. Fairing 2, flying soon, also has a slightly larger diameter. Could make fairing much longer if need be & will if BFR takes longer than expected.
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Was it ever a consideration to put MVac engines on the centre core and only light it when you're super high, added reinforcement and MOAR BOOSTERS on the side, like 6 f9 cores surrounding an orbiter core?
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Won't happen, as the companies focus after F9 B5 and Dragon is BFR. Fully reusable it will be much cheaper anyway.
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Yeah well, /you/ would say that On orbit refuelling gonna be cool as
@dog_rates too, easier to reuse a spacetug if it never has to deorbit, land and launch between pushing satellites around -
Speaking of
@dog_rates, why has nobody asked Elon the most important question yet: will doggos be allowed in the Mars colony? -
It's a pupsibility
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People would be pupset if they couldn't take their dogs.
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I know, it would be laika really hard decision between going to mars and staying with your doggo
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I'm sure dogs will be permitted - as livestock
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Is there a limit of how tall the rocket can be (aerodynamic stability) ?
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Von Braun had a rule of thumb that a 10:1 height:diameter ratio should not be exceeded for vehicle strength and wind loading. Falcon 9 exceeds this. Von Braun of course worked in a different era of materials and digital control tech.
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Would have though spacex already have enough problems with wind shear. For example FH almost lost the window because of wind.
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Omg Scott
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That's one benefit to being high-profile.
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BFR Heavy?
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Does girth really matter for payloads ? And yes, I’m serious
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Girth expands volume much faster than length.
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But it also adds pressure where as length doesn’t. Surely there is a design “limit” for girth on Payloads?
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