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Talk-Polywell.org • SpaceX News - Page 149
Page 149 of 153

Re: SpaceX News

Posted: Fri Jan 04, 2019 7:13 pm
by kunkmiester
So how does the need to spend weight on more shielding affect the weight savings?

Re: SpaceX News

Posted: Sat Jan 05, 2019 12:41 am
by paperburn1
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

Re: SpaceX News

Posted: Sat Jan 05, 2019 3:45 am
by Maui
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.

Re: SpaceX News

Posted: Sat Jan 05, 2019 10:42 pm
by paperburn1
Or maybe a totally different problem is being fixed by the SS
https://www.wired.com/story/a-spacex-de ... g-the-iss/

Re: SpaceX News

Posted: Sun Jan 06, 2019 2:57 pm
by paperburn1

Re: SpaceX News

Posted: Mon Jan 07, 2019 6:47 am
by Skipjack

Re: SpaceX News

Posted: Wed Jan 09, 2019 12:08 am
by Maui

Re: SpaceX News

Posted: Sat Jan 12, 2019 3:13 am
by Skipjack
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.

Re: SpaceX News

Posted: Sun Jan 13, 2019 9:41 am
by Giorgio
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).

Re: SpaceX News

Posted: Mon Jan 14, 2019 8:10 am
by choff
Saw a report SpaceX is laying off 10% of the workforce.

Re: SpaceX News

Posted: Wed Jan 16, 2019 7:41 pm
by Giorgio

Re: SpaceX News

Posted: Wed Jan 23, 2019 12:46 am
by Maui

Re: SpaceX News

Posted: Wed Jan 23, 2019 4:18 am
by paperburn1
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.

Re: SpaceX News

Posted: Wed Jan 23, 2019 6:22 pm
by Maui
The Starship hopper was destroyed last night by a storm :(
https://forum.nasaspaceflight.com/index ... msg1904371

Re: SpaceX News

Posted: Wed Jan 23, 2019 10:33 pm
by Skipjack