magnemoe Posted October 26, 2018 Share Posted October 26, 2018 56 minutes ago, StrandedonEarth said: They were planning on using the SDs for propulsive landing, so they should be able to throttle pretty deep Yes, you could not do hoverslam manned. The high g force is an requirement for abort at all situations especially max-q breakup However the superdrako is less efficient than the drako engines so you would want them for orbital operations. Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted October 26, 2018 Share Posted October 26, 2018 2 hours ago, MinimumSky5 said: "Why would we interview someone from SpaceX, when Bob here seems so engaged on the topic!" *Bob is yelling at random vehicles as they move past, telling them to hurry up. * Bet he yells at clouds, too... Quote Link to comment Share on other sites More sharing options...
Ultimate Steve Posted October 27, 2018 Share Posted October 27, 2018 Quote Link to comment Share on other sites More sharing options...
tater Posted October 29, 2018 Share Posted October 29, 2018 Quote Link to comment Share on other sites More sharing options...
Barzon Posted October 29, 2018 Share Posted October 29, 2018 ooh Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted October 29, 2018 Share Posted October 29, 2018 Hey, remember that flap a while back where SpaceX had to cut the camera feed because reasons? The Gummint is actually close to a meaningful and reasonable change in regulation (shocking! ). Quote Link to comment Share on other sites More sharing options...
Ultimate Steve Posted October 29, 2018 Share Posted October 29, 2018 18 minutes ago, CatastrophicFailure said: Hey, remember that flap a while back where SpaceX had to cut the camera feed because reasons? The Gummint is actually close to a meaningful and reasonable change in regulation (shocking! ). Quote Kelley alluded to that issue in her remarks. “SpaceX’s GoPro camera, that is used for marketing and shows customers that the payloads have successfully been separated, should not be treated in the same way as the highly technical camera that can see your shoelaces from space,” she said. Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted October 30, 2018 Share Posted October 30, 2018 Really looking forward to seeing this one go up. I hope they show the complete deployment sequence... then someone speeds it up and sets it to “Flight of the Bumblebee.” Quote Link to comment Share on other sites More sharing options...
tater Posted October 31, 2018 Share Posted October 31, 2018 https://arstechnica.com/information-technology/2018/10/unhappy-elon-musk-went-on-firing-spree-over-slow-satellite-broadband-progress/ Quote Link to comment Share on other sites More sharing options...
tater Posted November 1, 2018 Share Posted November 1, 2018 (and a few more before that in November... Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted November 1, 2018 Share Posted November 1, 2018 Also, RE: @tater's quoted tweet, I read recently that Crew Dragon flights will all be drone ship booster landings as opposed to RTLS, same reasoning as the dual-engine Centaur for those other guys. Allows a flatter launch profile, thereby exposing the crew to lower G-loading in the event of an abort. Quote Link to comment Share on other sites More sharing options...
Xd the great Posted November 1, 2018 Share Posted November 1, 2018 A question for the bfr: how do spaceX plan on keeping the cryo oxygen stored for months? Quote Link to comment Share on other sites More sharing options...
Rakaydos Posted November 1, 2018 Share Posted November 1, 2018 5 hours ago, Xd the great said: A question for the bfr: how do spaceX plan on keeping the cryo oxygen stored for months? Vent the main tank to vacuum to thermus the header tanks with no solar irradiation. Any additional cooling will require bleedoff. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted November 1, 2018 Share Posted November 1, 2018 5 minutes ago, Rakaydos said: Vent the main tank to vacuum to thermus the header tanks with no solar irradiation. But the metal structure still keeps conducting the heat. Quote Link to comment Share on other sites More sharing options...
Rakaydos Posted November 1, 2018 Share Posted November 1, 2018 58 minutes ago, kerbiloid said: But the metal structure still keeps conducting the heat. At a significantly reduced rate, especially if the ship stays nose on to the sun. And when that's not enough, I mentioned the solution in the part of the post you deleted. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted November 1, 2018 Share Posted November 1, 2018 3 minutes ago, Rakaydos said: I mentioned the solution in the part of the post you deleted. I can't delete posts. And my question post is not edited. So, I don't understand this part. 4 minutes ago, Rakaydos said: At a significantly reduced rate Metal is a good conductor. Buran had a small tank with a big mechanical skimmer inside to keep LOx liquid for 2-3 weeks. Quote Link to comment Share on other sites More sharing options...
sh1pman Posted November 1, 2018 Share Posted November 1, 2018 1 hour ago, kerbiloid said: But the metal structure still keeps conducting the heat. What metal structure? Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted November 1, 2018 Share Posted November 1, 2018 Just now, sh1pman said: What metal structure? Tank, truss, hull, electric cables, pipes. Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted November 1, 2018 Share Posted November 1, 2018 5 minutes ago, kerbiloid said: Tank, truss, hull, electric cables, pipes. Nearly all of that will be composite, which is a much poorer heat conductor. Quote Link to comment Share on other sites More sharing options...
sh1pman Posted November 1, 2018 Share Posted November 1, 2018 6 minutes ago, kerbiloid said: Tank, truss, hull, electric cables, pipes. All made of composites, except maybe pipes and cables, but those can be insulated. Quote Link to comment Share on other sites More sharing options...
Elthy Posted November 1, 2018 Share Posted November 1, 2018 Since they will require an extensive thermal management system anyway i dont see why SpaceX couldnt add a "refrigerator" or something to liquefy the boiloff... Quote Link to comment Share on other sites More sharing options...
Rakaydos Posted November 1, 2018 Share Posted November 1, 2018 1 hour ago, kerbiloid said: I can't delete posts. And my question post is not edited. So, I don't understand this part. 2 hours ago, Rakaydos said: Vent the main tank to vacuum to thermus the header tanks with no solar irradiation. Any additional cooling will require bleedoff. Quote Link to comment Share on other sites More sharing options...
Xd the great Posted November 1, 2018 Share Posted November 1, 2018 So there is a smaller tank in a big tank. Will spaceX run a helium fridge? Quote Link to comment Share on other sites More sharing options...
satnet Posted November 2, 2018 Share Posted November 2, 2018 10 hours ago, Rakaydos said: Vent the main tank to vacuum to thermus the header tanks with no solar irradiation. Any additional cooling will require bleedoff. Elon basically said this a year ago in a reddit AMA here. Granted that was the previous BFR design, but I doubt they've changed this. He did mention a cryocooler was an option down the road. I recalled there was a section on space storable propellants in Ignition, the most relevant part is this: "After all, the hard vacuum of space is a pretty good insulator, and when you have, in effect, a Dewar flask the size of the universe available, you can store a low-boiling liquid a long time. An arbitrary upper limit (—150°) was set for the boiling point of a space-storable, but the custom is to stretch this limit to include the propellant you want to sell. OF2, boiling at —144.8° is considered a space storable, but if you want to call its ideal partner, methane, CH4, boiling at—161.5° one too, nobody is going to complain too loudly." Temperatures are in Celsius and this is from a time where OF2 is something people considered flying (wouldn't bet on it today). This does make things interesting though because LOX has a boiling point of -182.9 degrees, so we need to stretch the definition of space storable a little further. Quote Link to comment Share on other sites More sharing options...
tater Posted November 5, 2018 Share Posted November 5, 2018 We're in the SpaceX launch doldrums, the SpaceX thread was on page 2... Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.