DocM Posted August 2, 2018 Author Share Posted August 2, 2018 Latest spin from Mulholland, Link to comment Share on other sites More sharing options...
Unobscured Vision Posted August 2, 2018 Share Posted August 2, 2018 So a 50% bad/no go systemic fault. Nope, that's not a design flaw at all. (So here's what happened, class. Turn to page 12 of your Fluid Dynamics books. ?) Any open-loop system that will be doing resistive work which also contains a sublimate (<89% liquid-state) or stable (>90% liquid-state) fluid under pressure must be designed to account for any expelling shock that is exerted in that system if rapid decompression of that high-pressure fluid is anticipated to occur. If not, safeguards should either be a first order priority to eliminate unintended expelling shocks OR that system should immediately be converted to a closed loop to prevent leakage or explosive decompression that could result in destruction of equipment, facilities, and/or personnel. In layman's terms: Boeing's Engineers (or the Suppliers) forgot that they were dealing with sublimate superfluids under extreme pressures. Their new RCS valves could NOT resist the pressures in the lines holding the hydrazine fuel, so those valves leaked that crap all over the place. Soon as they primed 'em it was all over. 50% systemic failure rate. The valves were moved out of their "install position" and into the "in-use/closed" position, but they couldn't cope with the pressure completely. The "surge pressure" (aka the expelling shock force) did it's deed. Sputtering like an overfilled coffee maker. Everyone knows what the expelling shock force with fluids is. Ever used a garden hose with one of the "gun-style" attachments on the end, then sprayed the water? The sensation of the hose moving backwards is expelling shock force. "Surge pressure". That same force also makes the length of the hose appear to "jump". Now do it at a Car Wash with one of THOSE hoses. Strong, isn't it? Those hoses jump way more. That's another example of expelling shock force. NOW imagine internal valves trying to hold back a few hundred (or more) PSI. That's gonna be one hell of a jolt. RCS Valves need to be able to close the same way EVERY TIME to hold that back or things go very, very badly. Those fuel lines need to be able to take that PLUS the expelling shock force (and remember that sublimates can reliquify as they are expelled too, increasing their volume inside a space) ... you get the idea now. Problem I have with it is that this is a basic thing with Fluid Dynamics. Those Engineers simply designed a [crappy] RCS Valve. Did they seriously forget basic Fluid Dynamics, or do they not CARE?! Nope. I'm calling B.S. on that RIGHT now. There's NO way that simply changing the start position on those valves is going to solve this problem. No forking WAY NASA should allow this to simply pass. DocM and bguy_1986 2 Share Link to comment Share on other sites More sharing options...
DocM Posted August 2, 2018 Author Share Posted August 2, 2018 (edited) Leaked (?) ISS schedule shows both Crew Dragon and Starliner. Uncrewed: December 2018 Crewed: May-June 2019 Thus preserving the illusion of a horse race. Crews Crew Dragon Operational Mission 1: Sunita Williams, Eric Boe Starliner Crew Flight Test: Doug Hurley, Behnken, and Boeing test pilot Christopher Ferguson Note the first Crew Dragon with a crew is labeled OM-1 (Operational Mission 1) and not DM-2 (Demo Mission 2) (!!), while Starliner's mission is still CFT (Crewed Flight Test.) This sort-of indicates Crew Dragon will be certified first. Turning a crewed test flight into an operational mission had been discussed several months ago, but it was to be Starliner and not Crew Dragon. Edited August 2, 2018 by DocM Unobscured Vision 1 Share Link to comment Share on other sites More sharing options...
Unobscured Vision Posted August 2, 2018 Share Posted August 2, 2018 And please note, everyone, that the launch dates are set by the open berthing slots on the ISS, not necessarily when the craft are ready. Link to comment Share on other sites More sharing options...
Beittil Posted August 2, 2018 Share Posted August 2, 2018 Target dates, for SpaceX slightly ahead of the previously released schedule. But of course likely to still slip into the respective months listed earlier. Anyway, good to finally see SpaceX first again! Unobscured Vision 1 Share Link to comment Share on other sites More sharing options...
DocM Posted August 2, 2018 Author Share Posted August 2, 2018 (edited) Better dates from NASA https://blogs.nasa.gov/commercialcrew/2018/08/02/nasas-commercial-crew-program-target-test-flight-dates-3/ Targeted Test Flight Dates Boeing OFT (uncrewed): late 2018/early 2019Boeing CFT (crewed): mid-2019 SpaceX DM-1 (uncrewed): November 2018SpaceX DM-2 (crewed): April 2019 Barring anything unforseen, it looks like SpaceX gets the US flag and Shuttle model trophies left by the last Shuttle crew for its first successor. Unobscured Vision and bguy_1986 1 1 Share Link to comment Share on other sites More sharing options...
Unobscured Vision Posted August 2, 2018 Share Posted August 2, 2018 I expect Sunita Williams to be the Commander for the DM-1 flight. DocM 1 Share Link to comment Share on other sites More sharing options...
Unobscured Vision Posted August 3, 2018 Share Posted August 3, 2018 Ack, DM-2 flight. Sorry all, stress. The classload is getting to me. DocM 1 Share Link to comment Share on other sites More sharing options...
DocM Posted August 3, 2018 Author Share Posted August 3, 2018 (edited) Whoa.... While the dates above are posted at the top of the page, all Boeing Starliner mission info has been removed from NASA's 'Launches and Landings' list. Nothing there but SpaceX Crew Dragon DM-1 & DM-2, ISS Expeditions and science launches. https://www.nasa.gov/launchschedule/ Unobscured Vision 1 Share Link to comment Share on other sites More sharing options...
Unobscured Vision Posted August 3, 2018 Share Posted August 3, 2018 Ruh-roh ... 'whelp. I wouldn't be surprised if Starliner got canned and they're going all in with Orion JUST to give it an actual mission set. Between the RCS Valves/plumbing problem, the Atlas V "black zones" issue (that still isn't sorted), the Abort Engines thing that'd likely detonate the upper stage of the Atlas upon use (and crush the capsule from below), and the lack of info from the Russians on the RD-180 data to get it human-rated ... ... Starliner's a "no-go". Betcha. Link to comment Share on other sites More sharing options...
DocM Posted August 3, 2018 Author Share Posted August 3, 2018 (edited) PCM = Post Certification Mission Crew Dragon DM-2: Doug Hurley and Bob Behnken Crew Dragon PCM-1: Victor Glover and Mike Hopkins Starliner CFT: Eric Boe, Nicole Aunapu Mann, Chris Ferguson (Boeing test pilot) Starliner PCM-1: Josh Cassada and Sunita "Suni" Williams Edited August 3, 2018 by DocM Link to comment Share on other sites More sharing options...
Unobscured Vision Posted August 3, 2018 Share Posted August 3, 2018 Wow. Switched the crews all up. I wonder what else has been misinformation. Link to comment Share on other sites More sharing options...
DocM Posted August 3, 2018 Author Share Posted August 3, 2018 (edited) From the AMA Quote hristinaremter USA: is there a bathroom on the new commercial flights? dragon and starliner crew NASA: For Dragon, yes. -Bob Quote rhoracio: big congratulations to you all! Q: would you please explain does SpaceX'es helmet visor open? NASA: The visor does open. We normally have it open on our way to the pad, but closed for launch and for entry. -Bob NASA: Yes. There's two push buttons about where your chin is. They allow it to pop open whenever you need it to. - Doug Edited August 4, 2018 by DocM bguy_1986 and Unobscured Vision 2 Share Link to comment Share on other sites More sharing options...
DocM Posted August 4, 2018 Author Share Posted August 4, 2018 Unobscured Vision 1 Share Link to comment Share on other sites More sharing options...
DocM Posted August 4, 2018 Author Share Posted August 4, 2018 Link to comment Share on other sites More sharing options...
DocM Posted August 13, 2018 Author Share Posted August 13, 2018 bguy_1986 and Unobscured Vision 1 1 Share Link to comment Share on other sites More sharing options...
DocM Posted August 13, 2018 Author Share Posted August 13, 2018 (edited) Everyday Astronaut has posted a bunch of SpaceX spacesuit close-ups. https://everydayastronaut.com/up-close-and-personal-with-spacexs-space-suit/ Example bguy_1986 and Unobscured Vision 2 Share Link to comment Share on other sites More sharing options...
Unobscured Vision Posted August 13, 2018 Share Posted August 13, 2018 Friggin' gorgeous spacesuit. And talk about functional .... yeesh! Best spacesuit EVER. Link to comment Share on other sites More sharing options...
DocM Posted August 14, 2018 Author Share Posted August 14, 2018 CBS video has a nice shot of the glass cockpit control panel. https://cbsloc.al/2KOwitn Link to comment Share on other sites More sharing options...
DocM Posted August 14, 2018 Author Share Posted August 14, 2018 Link to comment Share on other sites More sharing options...
DocM Posted August 14, 2018 Author Share Posted August 14, 2018 (edited) Reporter crawled into Crew Dragon and shot some video, and a panorama. Edited August 14, 2018 by DocM Unobscured Vision 1 Share Link to comment Share on other sites More sharing options...
bguy_1986 Posted August 14, 2018 Share Posted August 14, 2018 So is the toilet the grey thing at the top that they stare at when they sit down? I was thinking that was the top hatch? Unobscured Vision 1 Share Link to comment Share on other sites More sharing options...
DocM Posted August 14, 2018 Author Share Posted August 14, 2018 At the very top is the International Docking Adapter & hatch, then lower is the toilet and privacy curtain. Starliner has no toilet. bguy_1986 and Unobscured Vision 1 1 Share Link to comment Share on other sites More sharing options...
DocM Posted August 15, 2018 Author Share Posted August 15, 2018 Simulator, and a closeup. In the low center there's a T handle for manual SuperDraco aborts - pull & twist. On an arm rest is a keypad. The suit's umbilical connects to a port on the right thigh. No tangle of plumbing. Unobscured Vision and bguy_1986 2 Share Link to comment Share on other sites More sharing options...
Unobscured Vision Posted August 15, 2018 Share Posted August 15, 2018 That display though ... och, that's beautiful. Link to comment Share on other sites More sharing options...
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