SpaceX Ready to Resume Starhopper Testing with Static Fire and Hop
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Submitted July 16, 2019 at 03:13AM by TGMetsFan98
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Scott Manley breaks down the anomaly report that destroyed the Dragon Capsule a couple months ago
https://youtu.be/6P063KnI5NI

Submitted July 16, 2019 at 06:09PM by Bulevine
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​​​​Apollo 11 50th anniversary
Apollo 11 was the spaceflight that first landed humans on the Moon. Commander Neil Armstrong and lunar module pilot Buzz Aldrin, both American, landed the Apollo Lunar Module Eagle on July 20, 1969, at 20:17 UTC - Wikipedia

To celebrate, we would like to share the 2019 Apollo 11 documentary:
From director Todd Douglas Miller (Dinosaur 13) comes a cinematic event fifty years in the making. Crafted from a newly discovered trove of 65mm footage, and more than 11,000 hours of uncatalogued audio recordings, Apollo 11 takes us straight to the heart of NASA’s most celebrated mission—the one that first put men on the moon, and forever made Neil Armstrong and Buzz Aldrin into household names. Immersed in the perspectives of the astronauts, the team in Mission Control, and the millions of spectators on the ground, we vividly experience those momentous days and hours in 1969 when humankind took a giant leap into the future.

Click here to watch it now on DR Documentaries
Watch the trailer here

Share this with your friends and family!

Source
@DRDocumentaries
@EverythingScience

SpaceX StarHopper Static Fire (LIVE 1.5 miles away)
https://youtu.be/ACYW4RDCS90?t=2834

Submitted July 17, 2019 at 06:02AM by corourke
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Um, did no one HAZOP the thruster system?
ChemE here, 20 yrs in mostly semiconductor, UHP gases and chems like elemental fluorine, TCS, even ClF3, and I am bewildered... are we getting information filtered through SocMed interns, or actually from engineers? Either the press release was written by people that don't understand system design, or the system was designed by people that don't understand design... I wouldn't be so frustrated but I've been a HUGE SpaceX fan and the 'investigation results' just aren't making sense .So what's my problem? For starters, you never depend on a check valve to be a positive shutoff. Never. At least, not any check valves I've ever been able to find/spec/use/hear about. Normally, if you want positive isolation, you install an isolation valve. The check valve stops a reverse flow (mostly), but is never a guarantee for 100.0000%. All the diagrams on this accident I've been able to find show it be used in this incorrect way, and I can not understand how no one raised their hand in the HAZOP (Hazard and Operability Study, a type of Process Hazard Analysis) and said "what if the oxidizer leaks past the check valve?" I've heard or said that literally dozens and dozens of times in my career. It's a tried and true standard question.And then we get to the talk about surprise with titanium and oxidizers having an issue. Really? Powerful oxidizers moving at speed in most metals, including Ti, are well known to be candidates for fires, since the 60s? 50s? That's why you design systems with velocity limits, and passivate the heck out of them prior to operation.Which makes me wonder, has anyone talked about flaking of the passivation layer, possibly from an impact, as the ignition source in that check valve? Small flakes at speed can impact (like on a check valve disk, or better yet, the soft seal) and create the point heat source necessary to start the larger fire. And they DID say there was a fire in the check valve... We always trained the heck out of our operators about the risk of impacts to piping, and the lengthy clean and re-passivation steps necessary to recover from it before placing the system back in service. Makes my stomach churn a little to think this might've been the result of someone under a schedule not admitting to an impact, or someone signing off on skipping a repassivation. Or there were contaminants in the piping upstream of the check valve from poor cleaning after manufacture that got swept up by the NTO. Whatever it was that "investigation result" is skipping over some key details.And finally there's the "we've fixed it by adding a rupture disk" spiel. Huh? You install an RD to protect against over pressure, nothing to do with flow. I've used them here and there (bulk silane trailer, etc) with always great success, so sure I like'em in their place, but where EXACTLY in this system does an RD stop the NTO from backflowing into the Helium pressurization system? Are they installing them as "one-time valves" of some type? I doubt it, the particle and debris generation would be <ahem> detrimental downstream.So at the end of the day I'm sure there's a lot we aren't hearing, and never will, and the engineer in me just wishes they would share honest results so those of us who do our best to keep others safe could learn and incorporate the lessons as well.And if I can run a HAZOP on the next system for you I'll do it for free, just let me tour a site, give me a hat, and please, please be safe up there.

Submitted July 17, 2019 at 08:32AM by davedigerati
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Eric Berger on Twitter: “Regarding Starhopper in South Texas, hearing from multiple sources that the "fireball" during Tuesday night's test caused no significant damage. Some minor repairs may be needed. SpaceX will proceed cautiously, with the "hop" test coming perhaps in days or few weeks.”
https://twitter.com/sciguyspace/status/1151853085750439937?s=21

Submitted July 18, 2019 at 04:50PM by rustybeancake
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@elonmusk: Aiming for hover test next week
https://twitter.com/elonmusk/status/1151950516093456384

Submitted July 18, 2019 at 10:24PM by Polonium83
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Crew Dragon Parachute Tests - Video
https://www.youtube.com/watch?v=B9eYCGOlr5Y

Submitted July 18, 2019 at 10:55PM by alex_wonga
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Elon Musk Told Us Why He Thinks We Can Land on the Moon in ‘Less Than 2 Years’
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Submitted July 18, 2019 at 02:32PM by YZXFILE
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@ElonMusk: Fully Fueled StarShip in orbit carrying 100 tons of cargo will have 6.9km/s of Delta-V.
https://twitter.com/elonmusk/status/1151300180148252674

Submitted July 19, 2019 at 07:41PM by MikePomeroy82
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SpaceX on Twitter: Falcon 9 static fire test complete — targeting July 24 launch from Pad 40 in Florida for Dragon’s eighteenth resupply mission to the @Space_Station
https://twitter.com/SpaceX/status/1152345328248471552

Submitted July 20, 2019 at 12:32AM by FutureMartian97
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@ElonMusk: “Texas and Florida Starship prototypes (not Hopper) fly in 2 to 3 months”
https://twitter.com/elonmusk/status/1152367082018754561?s=21

Submitted July 20, 2019 at 01:59AM by TheMagicIsInTheHole
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Elon Musk on Twitter: Starship launch structure being built offsite and will be attatched to Pad 39A on the other side of the current 39A launch tower
https://twitter.com/elonmusk/status/1152374972502794240

Submitted July 20, 2019 at 03:35AM by _Andreww_
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Brief Analysis on potential BFR Reentries
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Submitted July 20, 2019 at 09:00PM by ClarkeOrbital
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Elon Musk on Twitter: Starship Super Heavy with 35 Raptors
https://twitter.com/elonmusk/status/1152853620682924032

Submitted July 21, 2019 at 10:12AM by OccupyMarsNow
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Raptor Engine Bell Next to A Merlin 1D at SpaceX Hyperloop Competition
https://twitter.com/w00ki33/status/1153015662974947328

Submitted July 21, 2019 at 10:04PM by FutureMartian97
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Elon Regarding SuperHeavy: Outer engines stick out slightly from 9m diameter, don’t gimbal & are mechanically joined at nozzle
https://twitter.com/elonmusk/status/1153419411715346432?s=21

Submitted July 23, 2019 at 12:20AM by FutureMartian97
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<b>Community Starship Loads Model - Chapter 2</b>
It's been a while since my <a href="https://www.reddit.com/r/SpaceXLounge/comments/awy9t1/cslm_an_introduction_to_my_latest_project/">first post</a> over in the lounge (look there for a basic project introduction). Since conception, I had to take a bit of break for grad school. I've recently picked the project back up, and I'm more excited than ever! Bad news is: I don't have any results to share, yet; I've been working mostly on laying out the procedures and tools I can use to make this whole thing possible. As always this is pretty much pure speculation.To recap for anyone (and I assume many) that didn't see my initial post: I'm interested in studying Starship from a structural perspective. The first major project I'm doing in this realm is called a "Loads Model" which is basically a coarse Finite Element Model (FEM) with simplifications and optimizations made to the vehicle in an effort to balance complexity (bad) and accuracy (good). I'm doing this because I'm interested in it and I want to master the skill-set. Okay so let's get to it!(If you like to see pictures first, scroll down to "Current Status." There aren't many, sorry! I'll have more in the next update!)&#8203;Data AvailabilitySo for starters, I wanted to address the availability of the project and data. This project will be <a href="https://github.com/Czarified/CSLM">100% open source</a>, and use data only publicly available. To do this, I am severely limited in the model size because I only have a student edition for MSC Nastran. Right now, I'm thinking a half-symmetry model will be appropriate enough, and we'll have to keep the meshes fairly coarse.Additionally, "Space Launch Vehicles" and "Spacecraft" are not ITAR restricted, and this project will be sticking to airframe "modeling" to avoid any issues with engine technology. This model does not support actual design, since it will use so many optimizations, and I am not claiming to provide any engineering services or consultation.&#8203;Model and GeometryPreviously, I created basic lines and geometry inside Patran (MSC's pre/post editor for FEM). This proved quite difficult and I was never really happy with the results. Additionally, it was difficult for others to easily contribute, if they had a better idea of how to capture the shape of Starship features. So starting with this release (LD0.1), I'll be using OpenVSP. VSP is a program developed initially in NASA, and it's specifically designed to produce basic aircraft forms for use in CFD. OpenVSP can now generate structural meshes, or export surfaces for meshing in your pre-processor of choice. Additionally, <a href="http://openvsp.org/">OpenVSP is free</a> and easy to get started in (I highly encourage playing around with it, it's quite fun). If I didn't quite get the angle of the wing/legs right, or the shape of the nose, or the width of the canards, you can easily grab the parametric design file from the project page and make the exact changes yourself!My previous model simplified the canards and wingLegs into planar objects. After thinking about this some more, this is probably an over-simplification. I believe SpX will be using a simplified and optimized spar+rib combination that is <a href="https://i.ytimg.com/vi/eYRRTJsKbhU/maxresdefault.jpg">typical for airfoils</a>. This will allow them to save weight by minimizing skin thickness. I'll go into details in the next post, as I walk through each part.&#8203;Loads DevelopmentThanks to <a href="https://www.reddit.com/user/Shahar603/">u/Shahar603</a>, we already have great data on the Falcon 9 flight envelope. They also gave me a little direction towards dynamic pressure derivations for altitude (scikit-aero). I'll be assuming similar flight profiles for initial loads development, and I've created some python scripts in a notebook to help apply these pressures.&#8203;Current Status and ModelsSo just to consolidate the links, the project is on github <a hre…

Starship Hopper RCS Thruster Tests
https://www.youtube.com/watch?v=_AAPE79iOqE

Submitted July 23, 2019 at 05:43PM by 675longtail
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CRS-18 Press Kit
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Submitted July 24, 2019 at 01:55AM by IanAtkinson_NSF
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