SpaceX News

Point out news stories, on the net or in mainstream media, related to polywell fusion.

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kunkmiester
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Re: SpaceX News

Postby kunkmiester » Fri Jan 04, 2019 7:13 pm

So how does the need to spend weight on more shielding affect the weight savings?
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paperburn1
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Re: SpaceX News

Postby paperburn1 » Sat Jan 05, 2019 12:41 am

I thing all things considered the weight penalty is small.
I am under the opinion that this is Nasa driven. I can see the fossils at nasa being afraid of composites because lack of testing and proof, but the 300 series steel is flight proven and used on a lot of vehicles. It does have a well document high temperature profile that is understood. Carbon fiber is not as well understood nor is the shielding requirements. To get that flight approved crew rating I believe they made a compromises to keep Nasa happy. Nasa is known for an arbitrary high number of test flights/ testing on new products before being accepted for crew rated. I am willing to bet the steel configuration has less flights and allows then to get more business. IMHO
I am not a nuclear physicist, but play one on the internet.

Maui
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Re: SpaceX News

Postby Maui » Sat Jan 05, 2019 3:45 am

I dunno— Musk seemed pretty excited about this when he first tweeted about the “delightfully counterintuitive” design change they had in store. Musk seems pretty transparent in expressing his feelings; I’m betting this came from SpaceX, not a NASA compromise.

paperburn1
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Re: SpaceX News

Postby paperburn1 » Sat Jan 05, 2019 10:42 pm

Or maybe a totally different problem is being fixed by the SS
https://www.wired.com/story/a-spacex-de ... g-the-iss/
I am not a nuclear physicist, but play one on the internet.

paperburn1
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Re: SpaceX News

Postby paperburn1 » Sun Jan 06, 2019 2:57 pm

I am not a nuclear physicist, but play one on the internet.

Skipjack
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Re: SpaceX News

Postby Skipjack » Mon Jan 07, 2019 6:47 am


Maui
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Re: SpaceX News

Postby Maui » Wed Jan 09, 2019 12:08 am


Skipjack
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Re: SpaceX News

Postby Skipjack » Sat Jan 12, 2019 3:13 am

I still wished that they had looked into making the Starship and SSTO for launching Starlink satellites. Yes, payload would be small, but enough for Starlink. Starlink will need hundreds of launches. That would be a great way to get operational experience quickly and SSTOs have a (small) operational advantage over TSTOs.

Giorgio
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Re: SpaceX News

Postby Giorgio » Sun Jan 13, 2019 9:41 am

As you said payload would be smaller.

If I remember correctly the total mass ratio difference for a DV=7.5km/sec with a 300 ISP fuel for a SSTO to a TSTO would be roughly 20 (SSTO) to 5 (TSTO). That means you loose 4 times the amount of mass you can bring to a DV=7.5Km/sec. And because the "mass" is the weight of the payload+rocket structure, it means that your payload mass can easily drop to 1/10th when you choose a SSTO system instead of a TSTO system.

Considering that they have a limited time frame to place in orbit the system, increasing the number of satellite they put in orbit in a single launch is the safest route (as well as the most economical one).
A society of dogmas is a dead society.

choff
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Re: SpaceX News

Postby choff » Mon Jan 14, 2019 8:10 am

Saw a report SpaceX is laying off 10% of the workforce.
CHoff

Giorgio
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Re: SpaceX News

Postby Giorgio » Wed Jan 16, 2019 7:41 pm

A society of dogmas is a dead society.

Maui
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Re: SpaceX News

Postby Maui » Wed Jan 23, 2019 12:46 am


paperburn1
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Re: SpaceX News

Postby paperburn1 » Wed Jan 23, 2019 4:18 am

Sooooo Elon said "Regenerative heat shield. A double-walled stainless shell—like a stainless-steel sandwich, essentially, with two layers. You just need, essentially, two layers that are joined with stringers. You flow either fuel or water in between the sandwich layer, and then you have micro-perforations on the outside—very tiny perforations—and you essentially bleed water, or you could bleed fuel, through the micro-perforations on the outside."

Or to put it another way "My shiny spaceship will fart it's way down to a landing"
¯\_(ツ)_/¯

Seriously this idea has been used in commercial aviation before in hot section blades, it also has been used in the ru68 rocket engine and others.
We have a madman with a spaceship here folks, nothing to see just move along.
Next thing he is going to tell us is that it is bigger on the inside.
I am not a nuclear physicist, but play one on the internet.

Maui
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Re: SpaceX News

Postby Maui » Wed Jan 23, 2019 6:22 pm

The Starship hopper was destroyed last night by a storm :(
https://forum.nasaspaceflight.com/index ... msg1904371

Skipjack
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Re: SpaceX News

Postby Skipjack » Wed Jan 23, 2019 10:33 pm



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