Codraroll Posted March 23, 2020 Share Posted March 23, 2020 2 hours ago, Wjolcz said: More than 1. If they want to go all the way to the full launch weight including all the margins, it will be exactly 1 at the point of launch. It might not get all the way to orbit that way, though. Quote Link to comment Share on other sites More sharing options...
ThatGuyWithALongUsername Posted March 23, 2020 Share Posted March 23, 2020 14 hours ago, zolotiyeruki said: What is SH's projected TWR at full launch weight? Didn't Elon say something about "aiming for about 1.5" at one point? Quote Link to comment Share on other sites More sharing options...
Flavio hc16 Posted March 23, 2020 Share Posted March 23, 2020 2 hours ago, ThatGuyWithALongUsername said: Didn't Elon say something about "aiming for about 1.5" at one point? they have 35/27 raptors for a 5000tons ships, so 7-7.4 Meganewton of thrust, 1.5 is correct Quote Link to comment Share on other sites More sharing options...
RCgothic Posted March 23, 2020 Share Posted March 23, 2020 (edited) Edit: Wrong thread, sorry. Mumble mumble SpaceX are awesome. Edited March 23, 2020 by RCgothic Quote Link to comment Share on other sites More sharing options...
RCgothic Posted March 23, 2020 Share Posted March 23, 2020 Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted March 25, 2020 Share Posted March 25, 2020 Aaaaaand more meh news: Quote Link to comment Share on other sites More sharing options...
magnemoe Posted March 25, 2020 Share Posted March 25, 2020 On 3/23/2020 at 3:08 PM, ThatGuyWithALongUsername said: Didn't Elon say something about "aiming for about 1.5" at one point? Think its 1.5 to 1.6 TWR, unlike an disposable rocket there you tend to go for low TWR as tanks and fuel is cheaper than engines, with an reusable stage especially with boost back you want an high TWR to get second stage up to speed fast so you can drop second stage early and go back. Quote Link to comment Share on other sites More sharing options...
mikegarrison Posted March 25, 2020 Share Posted March 25, 2020 31 minutes ago, CatastrophicFailure said: Aaaaaand more meh news: Hope they didn't just bomb somebody's house! SpaceX is planning to launch astronauts on unused, new boosters. At least at first. I wonder if they will eventually reach a point where it is considered safer to launch on a "flight-proven" booster? I've only been on the very first flight of an airplane one time, because those are usually very highly restricted. Usually just two pilots and a flight test engineer. (The one I was on was because we really needed some data on an ECS noise issue, and that was the only flight available to get it on.) Quote Link to comment Share on other sites More sharing options...
Xd the great Posted March 25, 2020 Share Posted March 25, 2020 7 hours ago, mikegarrison said: I wonder if they will eventually reach a point where it is considered safer to launch on a "flight-proven" booster? Think so, were there any mission failures with reused boosters yet? (Excluding landings) Quote Link to comment Share on other sites More sharing options...
magnemoe Posted March 25, 2020 Share Posted March 25, 2020 8 hours ago, mikegarrison said: Hope they didn't just bomb somebody's house! SpaceX is planning to launch astronauts on unused, new boosters. At least at first. I wonder if they will eventually reach a point where it is considered safer to launch on a "flight-proven" booster? I've only been on the very first flight of an airplane one time, because those are usually very highly restricted. Usually just two pilots and a flight test engineer. (The one I was on was because we really needed some data on an ECS noise issue, and that was the only flight available to get it on.) I assume they was afraid the parachutes could open during flight who would be bad. I wonder if an booster used one or two times is safer than an new, more than that and you probably get some wear who reduce relability. Quote Link to comment Share on other sites More sharing options...
RCgothic Posted March 25, 2020 Share Posted March 25, 2020 (edited) 2 hours ago, Xd the great said: Think so, were there any mission failures with reused boosters yet? (Excluding landings) The recent Starlink mission was definitely a close call although it was a primary mission success. Falcon9's two mission failures were with new boosters due to design flaws. There's never a good time to discover a design flaw, but it does make sense that if there are any they're more likely to show up on the first flight as opposed to the second or later. Also worth noting - Falcon9's one secondary payload failure was that after an engine failure there wasn't enough margin left to make the secondary orbit with the required level of confidence. Now that most flights are recovered they fly with a huge landing margin. If you have an engine out you just sacrifice the landing and use your full expendable performance to acheive the mission. It's a double level of mission security in addition to engine-out capability. Edited March 25, 2020 by RCgothic Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted March 25, 2020 Share Posted March 25, 2020 Spoiler That's because instead of custom "test articles" there is a legal and proper place for testing. Quote Link to comment Share on other sites More sharing options...
tater Posted March 25, 2020 Share Posted March 25, 2020 Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted March 25, 2020 Share Posted March 25, 2020 Actual good news: Quote Link to comment Share on other sites More sharing options...
RCgothic Posted March 26, 2020 Share Posted March 26, 2020 Quote Link to comment Share on other sites More sharing options...
RCgothic Posted March 26, 2020 Share Posted March 26, 2020 Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted March 26, 2020 Share Posted March 26, 2020 Let's hope it doesn't pop again. Quote Link to comment Share on other sites More sharing options...
RCgothic Posted March 26, 2020 Share Posted March 26, 2020 Has anyone ever seen any internal baffles go into these tanks? What's to stop the fuel sloshing around during throttle events and manoeuvring? Quote Link to comment Share on other sites More sharing options...
Wjolcz Posted March 26, 2020 Share Posted March 26, 2020 (edited) 1 hour ago, RCgothic said: Has anyone ever seen any internal baffles go into these tanks? What's to stop the fuel sloshing around during throttle events and manoeuvring? Not much. But that's probably desirable actually. When Starship goes belly first into the atmosphere the fuel should collect in its 'belly part' moving the centre of mass away from the centre of pressure making it more shuttlecocky. Unless it's designed to reenter with all tanks but the header ones empty. But then they are still talking about transpirational cooling and can't imagine they want to use precious header tank fuel for that. BTW did Saturn V have any anti-sloshing mechanisms? Edited March 26, 2020 by Wjolcz Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted March 26, 2020 Share Posted March 26, 2020 6 hours ago, Wjolcz said: BTW did Saturn V have any anti-sloshing mechanisms? Yep. Slosh baffles and rings in the first stage RP-1 tank: Quote Link to comment Share on other sites More sharing options...
cubinator Posted March 26, 2020 Share Posted March 26, 2020 38 minutes ago, sevenperforce said: Yep. Slosh baffles and rings in the first stage RP-1 tank: That's the Saturn 1 though, a much smaller rocket than the Saturn V. I wasn't able to find anything about Saturn V baffles. I know there were ullage motors on the third stage. Quote Link to comment Share on other sites More sharing options...
RCgothic Posted March 26, 2020 Share Posted March 26, 2020 That's Saturn 1 from AS-205. This footage from Saturn 1 AS-203 is from the S-IV stage. And this clip shows baffles inside Falcon 9 on CRS4: Quote Link to comment Share on other sites More sharing options...
tater Posted March 26, 2020 Share Posted March 26, 2020 Quote Link to comment Share on other sites More sharing options...
Wjolcz Posted March 27, 2020 Share Posted March 27, 2020 I will be very disappointed if it ends up as another tank that doesn't fly (with Raptors as the source of propulsion, not nitrogen). Quote Link to comment Share on other sites More sharing options...
tater Posted March 27, 2020 Share Posted March 27, 2020 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.