wumpus Posted May 20, 2019 Share Posted May 20, 2019 11 hours ago, StrandedonEarth said: An interesting engineering challenge to ensure that a turbopump spins down when completely out of propellants, instead of flying apart. If it was easy, it would have been done already. There may be other considerations, like vibration, balance, or resonance at play. Easier to just not let it run dry. I suspect the key would be to make sure that the preburner needs liquid propellant to operate. If it pulls pure He, you are ok. If it pulls a mixture of He and propellant vapor, while it might not have remotely the torque on the turbopump the lack of resistance would still make it overspin. This might be a significant advantage for Rocket Labs as being able to eke the last bit of fuel out of the final stage should help a bit with the rocket equation (those last drops of fuel give exponentially more delta-v). I wouldn't be surprised if they managed to use all their fuel (or pressure fed, but they typically don't have the Isp of pumps). Quote Link to comment Share on other sites More sharing options...
DDE Posted May 20, 2019 Share Posted May 20, 2019 On 5/19/2019 at 10:49 AM, Ho Lam Kerman said: Why would the engine go RUD when the turbine starts sucking air? I imagine it's due to pressure of some sort but I can't imagine why. And I think there was that Falcon 9 landing attempt where they ran out of fuel just moments before touchdown and the Merlins didn't RUD. Btw that really needs to be a feature on KSP... Engine RUD when your tank is bone-dry, just to bug all the people who do stock super efficient rockets with 0.1m/s of ∆v left in the stage after mission completion. Pretty much all modern engines use propellants as lubricant. On 5/7/2019 at 2:31 AM, Xd the great said: Somehow feels like a ICBM test... Sound like a rehash of Start. Quote Link to comment Share on other sites More sharing options...
tater Posted May 23, 2019 Author Share Posted May 23, 2019 Quote Link to comment Share on other sites More sharing options...
tater Posted May 23, 2019 Author Share Posted May 23, 2019 Quote Link to comment Share on other sites More sharing options...
Ho Lam Kerman Posted May 24, 2019 Share Posted May 24, 2019 Man aren't we getting a treat? New Kuaizhou rocket, sea launch LM-11 and the iSpace's Hyperbola-1 all within 10 days (as currently planned)? Quote Link to comment Share on other sites More sharing options...
Ultimate Steve Posted May 24, 2019 Share Posted May 24, 2019 1 hour ago, Ho Lam Kerman said: Man aren't we getting a treat? New Kuaizhou rocket, sea launch LM-11 and the iSpace's Hyperbola-1 all within 10 days (as currently planned)? I guess Smart Dragon 1 got delayed then. It was supposed to be May 30 but is now NET June. Wait, a sea launched LM-11? Quote Link to comment Share on other sites More sharing options...
Ho Lam Kerman Posted May 24, 2019 Share Posted May 24, 2019 (edited) 3 minutes ago, Ultimate Steve said: Wait, a sea launched LM-11? Yeah, that was what I thought. Let's see how this turns out. I'm currently checking other launch schedules. Edit: Spaceflight now says the same thing about the LM-11 sea launch. Nothing about Kuaizhou-11 and Smart Dragon-1 though. Edited May 24, 2019 by Ho Lam Kerman Quote Link to comment Share on other sites More sharing options...
tater Posted June 5, 2019 Author Share Posted June 5, 2019 Quote Link to comment Share on other sites More sharing options...
Scotius Posted June 5, 2019 Share Posted June 5, 2019 What? Chinese finally decided it's time to stop raining junk and poison on their own people? Shocking. Quote Link to comment Share on other sites More sharing options...
Xd the great Posted June 6, 2019 Share Posted June 6, 2019 12 hours ago, Scotius said: What? Chinese finally decided it's time to stop raining junk and poison on their own people? Shocking. Don't be silly. They are just testing their new ICBMs. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted June 6, 2019 Share Posted June 6, 2019 (edited) Or SLBM. Wanting to test its launch targetting from random positions. P.S. Others do this on submarines, but at least once a Chinese rocket submarine has been exploded during such test, so probably now they prefer a barge. Edited June 6, 2019 by kerbiloid Quote Link to comment Share on other sites More sharing options...
tater Posted June 21, 2019 Author Share Posted June 21, 2019 Quote Link to comment Share on other sites More sharing options...
tater Posted June 24, 2019 Author Share Posted June 24, 2019 Quote Link to comment Share on other sites More sharing options...
tater Posted June 24, 2019 Author Share Posted June 24, 2019 Quote Link to comment Share on other sites More sharing options...
tater Posted July 12, 2019 Author Share Posted July 12, 2019 Quote Link to comment Share on other sites More sharing options...
SuperFastJellyfish Posted July 12, 2019 Share Posted July 12, 2019 5 hours ago, tater said: 'It will be joined by a co-orbiting Hubble-class space telescope that can dock for propellant supply, maintenance and repairs.' Cool! I don't recall hearing about that. I wonder if they'll release images into the wild like NASA does. Since space is mostly for prestige, maybe they will. Quote Link to comment Share on other sites More sharing options...
tater Posted July 19, 2019 Author Share Posted July 19, 2019 Quote Link to comment Share on other sites More sharing options...
tater Posted July 19, 2019 Author Share Posted July 19, 2019 (edited) Edited July 19, 2019 by tater Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted July 20, 2019 Share Posted July 20, 2019 15 hours ago, tater said: It's a secret Chinese phantom cruiser! First it's transparent, and we can see stars through it, then it gets opaque! Quote Link to comment Share on other sites More sharing options...
Ho Lam Kerman Posted July 20, 2019 Share Posted July 20, 2019 22 hours ago, tater said: 21 hours ago, tater said: WAIT WHAT? This was, uh, not expected. Controlled deorbit or “controlled” deorbit? Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted July 20, 2019 Share Posted July 20, 2019 1 hour ago, Ho Lam Kerman said: Controlled deorbit or “controlled” deorbit? #notontomyhead Quote Link to comment Share on other sites More sharing options...
tater Posted July 20, 2019 Author Share Posted July 20, 2019 2 hours ago, Ho Lam Kerman said: WAIT WHAT? This was, uh, not expected. Controlled deorbit or “controlled” deorbit? Controlled, supposedly intentional. Quote Link to comment Share on other sites More sharing options...
Ho Lam Kerman Posted July 20, 2019 Share Posted July 20, 2019 On 7/12/2019 at 2:59 PM, tater said: I do believe I’ve missed this post. Heh. Quote Link to comment Share on other sites More sharing options...
tater Posted July 24, 2019 Author Share Posted July 24, 2019 Quote Link to comment Share on other sites More sharing options...
tater Posted July 25, 2019 Author Share Posted July 25, 2019 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.