Falcon 1, The World's Lowest Cost Rocket to Orbit |
Falcon 1, The World's Lowest Cost Rocket to Orbit |
Nov 19 2005, 06:28 PM
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
I don't know if this is the right place to post this, but here goes:
http://www.spaceref.com/news/viewpr.html?pid=18353 http://www.spacex.com/ Looking forward to launch videos... -------------------- |
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Mar 26 2007, 05:43 AM
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
They flew live-broadcast TV cameras inside Saturn and other launch vehicle tanks, with bright lights an everything (Mommy, it's dark in here!) to study fuel/oxidizer dynamics. One entire Saturn 1B flight (Saturn 202?) didn't have a CSM on top, the mission was just to study SIV-B behavior, I think. A Saturn 1 or early Centaur failed engine restart because they were unable to settle propellant adequately in the tank with ullage burn (or surface-tension control baffling). Some ?other? vehicle ended up in a flat spin, I think, with liquids ending up at opposite ends of fuel and oxidizer tanks, I suspect.
Slosh is a NON trivial problem, and abouit as amenable to numerical simulation as a supernova explosion. I doubt Elon had 50,000 hours eauivalent of CPU simulation time on slosh modeling as the recently published white dwarf supernova simulations had. NASA is spending extran $ on a launch vehicle with active 3-rd stage attitude control (Atlas) instead of Delta for Lunar Recon Orbiter (which made room for the LCROSS experiment) due to propellant slosh concerns in the big LRO tanks on a spin-stabilized upper stage. |
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Mar 26 2007, 11:55 AM
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Member Group: Members Posts: 321 Joined: 6-April 06 From: Cape Canaveral Member No.: 734 |
NASA is spending extran $ on a launch vehicle with active 3-rd stage attitude control (Atlas) instead of Delta for Lunar Recon Orbiter (which made room for the LCROSS experiment) due to propellant slosh concerns in the big LRO tanks on a spin-stabilized upper stage. Atlas doesn't have a 3rd stage. It wasn't slosh, it was nutation control. Completely different behavior. Still can have nutation problems with slosh baffles. A spacecraft with a large amount of propellant still could have slosh problems on a 3 axis stablized upperstage |
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