Brief Analysis on potential BFR Reentries
https://ift.tt/2Z4av8P

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
https://ift.tt/32MFAA2

Submitted July 24, 2019 at 01:55AM by IanAtkinson_NSF
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<b>r/SpaceX CRS-18 Official Launch Discussion & Updates Thread</b>
<a href="/#%20MC%20//%20section%20intro">Welcome to the r/SpaceX CRS-18 Official Launch Discussion & Updates Thread!<a href="https://www.reddit.com/r/spacex/comments/ch2ml7/rspacex_crs18_official_launch_discussion_updates/#siteTable_t3_ch2ml7">-> Jump to Comments <-Hello one and all! Its your favorite (err, only) launch campaign thread host and Star&#10022;Fleet Commander <a href="/u/CAM-Gerlach">u/CAM-Gerlach here hosting my first launch thread. Wish me luck! If you want me to see something, <em>please</em> tag me in it or send it directly to me as a DM, since things can get quite hectic around launch days. Thanks, and enjoy the launch!&#9989; Currently GO for the launch attempt<a href="https://images.squarespace-cdn.com/content/v1/5bedab06b27e395dd26ab8b5/1563591712665-D87ZGANKAZ19QYV2NFLF/ke17ZwdGBToddI8pDm48kDVEj010BbXsLnm509AHjVF7gQa3H78H3Y0txjaiv_0fDoOvxcdMmMKkDsyUqMSsMWxHk725yiiHCCLfrh8O1z5QPOohDIaIeljMHgDF5CVlOqpeNLcJ80NK65_fV7S1URgcHTpqDAQtV2R6KdC7zZbaM3y30Ca-3Xje4x1IhSpbm7cT0R_dexc_UL_zbpz6JQ/SpaceX+Falcon+9+CRS-18?format=1500w">CRS-18 Launch Infographic by <a href="https://gdbarrett.com/">Geoff BarrettSpaceX's 18th Commercial Resupply Services mission out of a total of 20 such contracted flights for NASA, this launch will deliver essential supplies to the International Space Station using the reusable Dragon 1 cargo spacecraft. The external payload for this mission is International Docking Adapter 3, replacing IDA-1 lost in SpaceX's CRS-7 launch failure. This mission will launch from SLC-40 at Cape Canaveral AFS on a Falcon 9, and the first-stage booster is expected to land back at CCAFS LZ-1.This is SpaceX's ninth mission of 2019, the second CRS flight of the year and the seventy-third Falcon 9 launch overall. It will re-use the Block 5 booster flown on the previous CRS-17 mission, as well the spacecraft flown on CRS-6 and CRS-13, in the first ever 3-time-use of a Dragon capsule.Liftoff currently scheduled for<a href="https://twitter.com/SpaceX/status/1152345328248471552">NET 22:24 UTC / 6:24 PM EDT Wednesday July 24 2019 (instantaneous window)Backup launch window22:01 UTC / 6:01 PM EDT Thursday July 25 2019; instantanious window gets 23-25 minutes earlier each day to match ISS orbitStatic fire completed<a href="https://twitter.com/SpaceX/status/1152345328248471552">22:00 UTC / 6:00 PM EDT Friday July 19 2019L-2 weather forecast<a href="https://www.patrick.af.mil/Portals/14/Weather/L-2%20Forecast%2024%20Jul%20Launch.pdf?ver=2019-07-22-112250-413">30% GO for Wednesday; 30% GO for Thursday; thunderstorms the main threat. Friday doesn't look much better, but the weekend does.Vehicle component locations<em>First stage</em>: <a href="https://twitter.com/NASASpaceflight/status/1150810738501595136">SLC-40 <em>Second stage</em>: <a href="https://twitter.com/NASASpaceflight/status/1150810738501595136">SLC-40 <em>Dragon</em>: CCAFS/KSCPayloadCommercial Resupply Services-18 supplies, equipment and experiments // <a href="https://space.skyrocket.de/doc_sdat/ida.htm">International Docking Adapter 3Payload launch mass4200 kg (Dragon) + 1290 kg (fuel) + 2221 kg payload mass = ≈7700 kg launch mass?ISS payload mass529.9 kg (IDA-3) + 1691.3 kg (Internal Cargo) = 2221.2 kg totalDestination orbitISS Low Earth Orbit (≈400 x ≈400 km, 51.66°)Launch vehicleFalcon 9 <a href="https://reddit.com/r/spacex/wiki/launches">(73rd launch of F9; 53rd launch of F9 Full Thrust; 16th launch of F9 FT Block 5)Core<a href="https://www.reddit.com/r/spacex/wiki/cores#wiki_b1056">B1056.2Past flights of this core1Spacecraft typeDragon 1 (21st launch of a Dragon spacecraft; 20th launch of a Dragon 1; 18th operational Dragon 1 launch)Capsule<a href="https://www.reddit.com/r/spacex/wiki/capsules">C108.3Past flights of this capsule2 (CRS-6; CRS-13)Launch site<a href="https://www.reddit.com/r/SpaceX/wiki/pads">SLC-40, Cape Canaveral Air Force Station, FloridaLandingYes, ground padLanding sites:<a…

@jeff_foust SpaceX’s Jessica Jensen says Dragon 1 is certified for three missions (CRS-18 is the third flight for this specific spacecraft) but Dragon 2 for CRS2 contract will be designed for at least 5 flights; won’t have the SuperDraco thrusters used on Crew Dragon.
https://twitter.com/jeff_foust/status/1154038577178664960

Submitted July 24, 2019 at 05:11PM by CProphet
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SpaceX on Twitter: Falcon 9 and Dragon are vertical ahead of tonight’s resupply mission to the @Space_Station. Weather is 30% favorable for the instantaneous launch window at 6:24 p.m. EDT, 22:24 UTC
https://twitter.com/spacex/status/1154041225458024448?s=21

Submitted July 24, 2019 at 04:51PM by failion_V2
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Falcon 9 set to launch Dragon on third flight to the ISS
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Submitted July 24, 2019 at 05:26PM by CProphet
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r/SpaceX CRS-18 Media Thread [Videos, Images, GIFs, Articles go here!]
It's that time again, as per usual, we like to keep things as tight as possible, so if you have content you created to share, whether that be images of the launch, videos, GIF's, etc, they go here.As usual, our standard media thread rules apply:All top level comments must consist of an image, video, GIF, tweet or article.If you're an amateur photographer, submit your content here. Professional photographers with subreddit accreditation can continue to submit to the front page, we also make exceptions for outstanding amateur content!Those in the aerospace industry (with subreddit accreditation) can likewise continue to post content on the front page.Mainstream media articles should be submitted here. Quality articles from dedicated spaceflight outlets may be submitted to the front page.Direct all questions to the live launch thread.

Submitted July 24, 2019 at 08:11PM by ElongatedMuskrat
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Starhopper Test Hop
https://www.youtube.com/watch?v=XqUSRBJPYUE

Submitted July 25, 2019 at 03:07AM by Wetmelon
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@elonmusk [Starhopper abort caused by] Pc (chamber pressure) high due to colder than expected propellant
https://twitter.com/elonmusk/status/1154261135245246465?s=19

Submitted July 25, 2019 at 12:00PM by CProphet
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The slide wires for the escape baskets have been reattached to the LC-39A tower.
It was first reported by Stephen C. Smith (@WordsmithFL): https://twitter.com/WordsmithFL/status/1152213251083636736But we got a visual confirmation now too with this great pic by /u/johnkphotoshttps://twitter.com/johnkrausphotos/status/1154183559046975488/photo/1The baskets would be used should an emergency arise right before crew getting in the vehicle or in the process of doing so, and would be used both by the astronauts and the closeout crew.Here is a video of the last time the basket were released back in 2012: https://www.youtube.com/watch?v=TGMWdtQYkbc

Submitted July 25, 2019 at 07:29PM by soldato_fantasma
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EA: "No more bleeding out methane and transpirational cooling?" Musk: "Thin tiles on windward side of ship & nothing on leeward or anywhere on booster looks like lightest option"
http://twitter.com/elonmusk/status/1154229558989561857

Submitted July 25, 2019 at 04:27PM by PhysicsBus
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Full gallery: Photos of the Falcon 9 / CRS-18 launch and landing, as seen from the roof of NASA’s Vehicle Assembly Building
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Submitted July 26, 2019 at 02:03AM by johnkphotos
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Elon on Twitter - "Starhopper flight successful. Water towers *can* fly haha!!"
https://twitter.com/elonmusk/status/1154599520711266305

Submitted July 26, 2019 at 05:49AM by jclishman
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Falcon9 CRS-18 | B1056.2 Descending Towards LZ-1 & Beginning its Landing Burn [John Pisani Photos]
​https://i.redd.it/pgqscorxdkc31.jpg

Submitted July 26, 2019 at 05:15AM by j_hilikus
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