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   sci.space.policy      Discussions about space policy      106,651 messages   

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   Message 104,752 of 106,651   
   Snidely to All   
   Re: 23:57 UTC 4 150m   
   18 Aug 20 11:58:12   
   
   From: snidely.too@gmail.com   
      
   Snidely noted that:   
   > JF Mezei blurted out:   
   >   
   >> So the fire on the engine was not normal then? Apart from debris flying   
   >> as it took off, that seemed to me like the biggest problem with the flight.   
   >   
   > AFAICT, we have no official comment.   
   >   
      
   But seems to be a much reduced problem compared to the Starhopper   
   flight:   
      
      
   Raptor’s new crown comes roughly 18 months after Elon Musk revealed   
   that the engine had beaten the Soviet RD-270 full-flow staged   
   combustion (FFSC) with a higher sustained chamber pressure (~257 bar vs   
   255 bar). A few days later, the same Raptor went even further, cresting   
   the Russian RD-180 engine’s 257 bar operating pressure with a peak of   
   268 bar. Still, SpaceX needed 6-12 more months to refine Raptor into an   
   engine capable of operating even close to those pressures for more than   
   ~10 seconds. In July and August 2019, Raptor engine SN6 flew twice on   
   Starhopper, culminating in a ~60-second, 150-meter hop that ended with   
   the engine nearly destroying itself seconds before landing.   
      
      
      
   I think they've got an engine there.   
      
   /dps   
      
   --   
   "Inviting people to laugh with you while you are laughing at yourself   
   is a good thing to do,  You may be a fool but you're the fool in   
   charge." -- Carl Reiner   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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