Dużo informacji z Twittera Elona na temat Starship. Ktoś na reddicie to zebrał w takie nieoficjalne AMA. Z ważniejszych rzeczy to próbny start prototypu odbędzie się marzec/kwiecień
Elon Tweetstorm / informal AMA:
Q: Stainless steel balloon tanks. Heavy metal. Calling it now. Welcome Atlas back Atlas B.
A: Stainless steel is correct, but different mixture of alloys & new architecture. Unlike Atlas, Starship is buckling stable on launchpad even when unpressurized.
A: While there are some material similarities, Starship is very different from the Atlas design
Q: Here’s a direct video for those too lazy to click. This is why the “Unlike Atlas, Starship is bucking stabile even when unpressurized” is a key element
A: Yup. Actually, the only significant design element in common with early Atlas is stainless steel & we’re using a different alloy mix. I super ♥️ 300 Series Stainless!
A: I will do a full technical presentation of Starship after the test vehicle we’re building in Texas flies, so hopefully March/April
Q: Wait… March/April 2019!? This is much sooner than expected, yes!?
Q: Who makes that Alloy? SpaceX or supplier?
A: For sheet/plate, at supplier made to our spec. For cast, in our Hawthorne foundry.
Q: Like SpaceX’s grasshopper program prior to F9 landing attempts. Starship will undergo similar launch/landing phase
Q: What is being made in San Pedro now? Will you return to manufacturing in San Pedro after the initial prototype or do you think Texas manufacturing is the way to go?
A: We’re building subsections of the Starship Mk I orbital design there
Q: Is the plan to get a full-scale starship operational and then build the Super heavy, or make a sub scale super-heavy as well?
A: This test hopper is at full body diameter of 9m / 30 ft, just not full height. Super Heavy will be full height & diameter.
Q: Cast ribbing?
A: Coldformed at cryo
Q: Launching Starlink from Starship?
A: Starlink V1 on Falcon, V2+ on Starship. Basically, all future products will contain either the word “star” or “link”
Q: While we have you, Elon…. How well is Raptor performing during test stand firings at McGregor? On track to support your Super Heavy/Starship schedule?
A: Yes. Radically redesigned Raptor ready to fire next month.
Q: Still full flow closed cycle? Don’t tell me you’re going beyond 300 bar
A: Yes, full flow, gas-gas, staged combustion. Will take us time to work up to 300 bar. That is a mad level.
Q: That is mad level. But can we all agree that the RD-170 has been a little too comfortable at #1 for too long at 265 bar here’s hoping for 300
A: It’s embarrassing that Boeing/Lockheed need to use a Russian engine on Atlas, but that engine design is brilliant
Q: Please say electric turbo pumps. Please say electric turbo pumps
A: You def don’t want electric pumps on a rocket engine! Raptor turbopumps alone need 100,000 horsepower per engine. That’s not a typo.
Q: Will this new structure hold the SSTO ability ?
A: Yes, but single stage to orbit with no payload is pointless. Add Super Heavy rocket booster & orbital payload is gigantic. Only need booster on Earth, due to deep gravity well & thick atmosphere. Starship alone on moons & Mars.
Q: Like I always say folks. SSTOs suck, as heavily touched on in this video. Not to mention going up SSTO is one thing, reusing is another!!! – “Why Single Stage to Orbit rockets SUCK. The wacky history and future maybes of SSTOs”
A: Seriously! We are just on the wrong planet for SSTO. Mars, no problem.
Q: That is one of the exceptions. Only now is the US starting to approach Soviet oxygen rich staged combustion technology and metallurgy. Also, Falcon 9 is the most operated rocket, now, not Atlas. The better probes is not mere funding. Vastly superior electronics tech.
A: SpaceX metallurgy team developed SX500 superalloy for 12000 psi, hot oxygen-rich gas. It was hard. Almost any metal turns into a flare in those conditions.
A: Our superalloy foundry is now almost fully operational. This allows rapid iteration on Raptor.
#spacex #kosmos #elonmusk #starship #ama