magnemoe Posted February 18, 2019 Share Posted February 18, 2019 15 hours ago, CatastrophicFailure said: Probably not, not with orbital refueling, anyway. You’d essentially be throwing away the center core when you could get the same result (a fully or near-fully fueled Starship in orbit) for (presumably) less by just launching multiple tankers. Rapid reuse really will be quite the paradigm changer. Also, it’s bugging the crap out of me that the “bottom” of that Starship is point off in some weird direction instead of in line with the booster mounting axis. Note that you have the option to burn starship dry to reach orbit. This will reduce safety margins and will obviously require refueling to land but will increase payload capability. RTLS for all three stages makes an heavy configuration pretty pointless. Quote Link to comment Share on other sites More sharing options...
tater Posted February 18, 2019 Share Posted February 18, 2019 Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted February 18, 2019 Share Posted February 18, 2019 18 hours ago, CatastrophicFailure said: Probably not, not with orbital refueling, anyway. You’d essentially be throwing away the center core when you could get the same result (a fully or near-fully fueled Starship in orbit) for (presumably) less by just launching multiple tankers. Rapid reuse really will be quite the paradigm changer. Also, it’s bugging the crap out of me that the “bottom” of that Starship is point off in some weird direction instead of in line with the booster mounting axis. As-depicted, the starboard aft fin would be inside the rightmost booster cap. But yeah, it's useless. Notional staging velocity for a single-stack Super Heavy is ~2 km/s. Going "Heavy Super Heavy" would put the center core at 3 km/s or more and so far downrange that it would need to reserve a prohibitive amount of fuel for boostback. Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted February 18, 2019 Share Posted February 18, 2019 13 minutes ago, sevenperforce said: But yeah, it's useless. Notional staging velocity for a single-stack Super Heavy is ~2 km/s. Going "Heavy Super Heavy" would put the center core at 3 km/s or more and so far downrange that it would need to reserve a prohibitive amount of fuel for boostback. Launch from Boca Chica, recover at Canaveral. Aside from getting cooked on the way down Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted February 18, 2019 Share Posted February 18, 2019 Just now, StrandedonEarth said: Launch from Boca Chica, recover at Canaveral. Aside from getting cooked on the way down Would need to get a landing pad in Tampa. Quote Link to comment Share on other sites More sharing options...
tater Posted February 18, 2019 Share Posted February 18, 2019 Quote Link to comment Share on other sites More sharing options...
DAL59 Posted February 18, 2019 Share Posted February 18, 2019 On an unrelated note: Quote Link to comment Share on other sites More sharing options...
totalitor Posted February 18, 2019 Share Posted February 18, 2019 Is there Israeli moon lander onboard? Should launch in february. Quote Link to comment Share on other sites More sharing options...
Barzon Posted February 18, 2019 Share Posted February 18, 2019 Yes, it is! I can't wait for the first commercial landing on the Moon! Quote Link to comment Share on other sites More sharing options...
tater Posted February 18, 2019 Share Posted February 18, 2019 Quote Link to comment Share on other sites More sharing options...
tater Posted February 19, 2019 Share Posted February 19, 2019 Quote Link to comment Share on other sites More sharing options...
tater Posted February 19, 2019 Share Posted February 19, 2019 Quote Link to comment Share on other sites More sharing options...
tater Posted February 19, 2019 Share Posted February 19, 2019 Quote Link to comment Share on other sites More sharing options...
Xd the great Posted February 20, 2019 Share Posted February 20, 2019 Why SpaceX does not use gridfins for second stage canards and wings? They save material. And spaceX well understands the dynamics of a gridfin, they use it. Quote Link to comment Share on other sites More sharing options...
Rakaydos Posted February 20, 2019 Share Posted February 20, 2019 11 minutes ago, Xd the great said: Why SpaceX does not use gridfins for second stage canards and wings? They save material. And spaceX well understands the dynamics of a gridfin, they use it. A gridfin isn't very draggy. For Starship, they WANT draggy airbrakes. Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted February 20, 2019 Share Posted February 20, 2019 (edited) 43 minutes ago, Xd the great said: Why SpaceX does not use gridfins for second stage canards and wings? They save material. And spaceX well understands the dynamics of a gridfin, they use it. As @Rakaydos said, they want as much drag as possible on entry. The grid fins on Falcon 9 are used because they need fine guidance and short-chord control surfaces perform better without stalling at supersonic speeds. Traditional fins (a la New Glenn) take more torque to move and stall more easily while supersonic. In contrast, the "flaps" on Starship will be operating initially at hypersonic speeds, where everything is in a state of stall and you are using differential compressive drag to induce roll and pitch rather than any fine aerodynamic guidance. They will function less like canards and more like airbrakes. Edited February 20, 2019 by sevenperforce Quote Link to comment Share on other sites More sharing options...
tater Posted February 20, 2019 Share Posted February 20, 2019 Quote Link to comment Share on other sites More sharing options...
MaverickSawyer Posted February 20, 2019 Share Posted February 20, 2019 Hmm... So, they're only able to catch one fairing half? Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted February 20, 2019 Share Posted February 20, 2019 Just now, MaverickSawyer said: Hmm... So, they're only able to catch one fairing half? Once they get it working reliably with one, they can add another ship to catch the other. Quote Link to comment Share on other sites More sharing options...
tater Posted February 21, 2019 Share Posted February 21, 2019 Quote Link to comment Share on other sites More sharing options...
Delay Posted February 21, 2019 Share Posted February 21, 2019 Yeah, 2:45 for me. I'll have to sit this one out. Quote Link to comment Share on other sites More sharing options...
sh1pman Posted February 21, 2019 Share Posted February 21, 2019 30 minutes ago, Delay said: Yeah, 2:45 for me. I'll have to sit this one out. 4:45 lol Hmm, wake up super early or not sleep at all... Quote Link to comment Share on other sites More sharing options...
tater Posted February 21, 2019 Share Posted February 21, 2019 (edited) Metal rods sticking up from the circular copncrete jig at Boca Chica. Yesterday a container arrived with the water tank company name on the side. Thought is they are about to rebuild the nose of the hopper. Edited February 21, 2019 by tater Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted February 21, 2019 Share Posted February 21, 2019 “Any resemblance to a swimming pool is purely coincidental!” Quote Link to comment Share on other sites More sharing options...
tater Posted February 21, 2019 Share Posted February 21, 2019 Quote Link to comment Share on other sites More sharing options...
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