From: mooregr@deletethisgreenms.com   
      
   "Jeff Findley"  wrote in message   
   news:MPG.3a861b2622caa488989daf@news.eternal-september.org...   
   >   
   >In article ,   
   >jfmezei.spamnot@vaxination.ca says...   
   >> Consider this: now they have telemetry and debris. Had they don this on   
   >> a launch pad with rocket firmly attached, they would have not only the   
   >> telemetry, but also the engines they could analyze on why one didn't ligh   
   >   
   >Testing like you describe doesn't represent the actual dynamics the   
   >vehicle experiences during flight.  Starship has to go from a stable   
   >"belly flop" to vertical in a few seconds.  That quick rotation no doubt   
   >causes all sorts of forces on the fuel and oxidizer resulting in   
   >pressure changes.  It's no wonder it's taking them a few times to get it   
   >right.   
   >   
   >In other words, a ground test with the vehicle stationary would almost   
   >certainly have passed.  SpaceX does all sorts of Raptor tests at   
   >McGregor Texas before shipping them to Boca Chica.   
   >   
   >Jeff   
      
   Exactly, if the test were simply "can we relight engines" I'd say SpaceX has   
   that down.   
   It seems Mezei is missing the point. The point is, "can we do aerodynamics   
   with a grain silo and THEN relight the engines".   
   To adequately test THAT, you need to... actually do the aerodynamics.   
      
   I'll also point out from other sources, SpaceX generally has been VERY   
   diligent with its FAA applications despite the issue here.   
      
   Yeah, SN9 has a RUD, it sucked. But... hey.. how many times has some test   
   version of Starship actually LEFT THE GROUND. Now compare to how many   
   versions of SLS have flown even an inch.  And compare the cost.   
      
   I'm ok with SpaceX's approach. And it's not on my direct dime.   
      
   I'm not sure what are worse, the fanbois who seem to think Musk and SpaceX   
   are gods who know everything and can do no wrong, or the ones who doubt   
   they'll never get it right. (cue the choir of folks who doubted they'd ever   
   get Falcon 9 to land, let alone reliably. How many have they nailed now? One   
   stage has flow I think 7 times?)   
      
      
      
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   Greg D. Moore                   http://greenmountainsoftware.wordpress.com/   
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   https://www.amazon.com/Disaster-Response-Lessons-Learned-Field/dp/1484221834/   
      
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