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starship? but ........ROTFL ! :-)



 
 
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Old March 4th 20, 01:08 PM posted to sci.space.policy
Jeff Findley[_6_]
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Default starship? but ........ROTFL ! :-)

In article ,
says...

On 2020-03-02 12:29,
wrote:

I think Musk is crazy because:
1) is trying to do something better than Saturn 5
2) Saturn 5 was scrapped about 50 years ago by NASA



Technology has advanced a bit since the 1960s.
What is being "displayed in public" at BocaChica doesn't represent the
real developmenht in my opinion.


I'll take that opinion with a grain of salt since you're not an expert
in the field. As someone with an aerospace engineering degree, I see a
rapid design, build, test cycle that can't be hidden from the public
because they're building in view of a road.

Consider that the Raptor engines are being developped in a serious and
private environment and are being tested with no hystericals.


Yes, they're being test fired at their existing facilities in McGregor
Texas. But they've actually reactivated the old vertical test stand so
that they can test Raptor vertically (in addition to the two horizontal
test cells they've been using):

https://twitter.com/spacex/status/1233080513516077058

The glorified beer kegs build publicly at Boca Chica gives SpaceX wants
to test very inexpensively some construction techniques with steel that
it has no experience with. So the failure of "SN1" teach SpaceX more
about how to weld steel. Maybe they will find a way to do steel, maybe
they will conslude it can't be done and switch back to more modern
materials.


Yeah, because no one in aerospace has ever figured out how to weld
stainless steel into liquid fuel propellant tanks. /s

https://en.wikipedia.org/wiki/Atlas_(rocket_family)

From above:

The first successful test launch of an SM-65 Atlas missile was
on 17 December 1957.[1] Approximately 350 Atlas missiles were
built.

The Atlas boosters would collapse under their own weight if not
kept pressurized with nitrogen gas in the tanks when devoid of
propellants. The Atlas booster was unusual in its use of
"balloon" tanks. The rockets were made from very thin stainless
steel that offered minimal or no rigid support. It was pressure
in the tanks that gave the rigidity required for space flight.
In order to save weight they were not painted and needed a
specially designed oil to prevent rust.

Note that when working with composites, small flaws in laying up the
fibre that leave air bubbles can be "fatal" to the structure. So I
suspect that SpaceX is at the same stage with learning to do flawless
welds. If you have seen close up pictures, you will see welds havce a
lot of arrows and markings along the welds.


Yes. These are prototypes. You calling them "glorified beer kegs"
shows your lack of knowledge about how engineering prototypes are often
built.

Jeff

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These posts do not reflect the opinions of my family, friends,
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