From: snidely.too@gmail.com   
      
   After serious thinking Snidely wrote :   
   > on 6/6/2021, Sylvia Else supposed :   
   >> On 07-Jun-21 11:51 am, JF Mezei wrote:   
   >>> Sanity check:   
   >>>   
   >>> At time of first stage separation for Falcon 9 and lighting of stage 2,   
   >>> we can see the foil "blanket" that is higher up from the engine bell on   
   >>> stage 2 move.   
   >>>   
   >>> Is this movement due to wind at that altitude/speed (about 100km) or   
   >>> just the blanket moving due to ship accelerating?   
   >>>   
   >>>   
   >>   
   >> Effect of changing acceleration (as the fuel is depleted) in combination   
   >> with vibration.   
   >   
   > I figured it was a side effect of pressurizing the feed lines.   
   >   
   > Does that engine gimbal or do they depend only on thrusters for 2nd stage   
   > guidance?   
      
   Pre-launch, the 2nd stage did an engine wiggle test, so I guess it   
   gimbals.   
      
   /dps   
      
   --   
   "First thing in the morning, before I have coffee, I read the obits, If   
   I'm not in it, I'll have breakfast." -- Carl Reiner, to CBS News in   
   2015.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)