From: jfindley@cinci.nospam.rr.com   
      
   In article ,   
   jfmezei.spamnot@vaxination.ca says...   
   >   
   > On 2021-06-27 17:02, Jeff Findley wrote:   
   >   
   > > Heavy will go up and down like a Falcon 9 booster.  Starship is an   
   > > entirely different beast.   
   >   
   > However, I was wondering if SpaceX has experience in precicely   
   > controlling roll (is it roll?) so that "arms" would be aligned correctly   
   > to fall on the cradle.  Has it mentioned wherher Falcon 9 not only lands   
   > on the X but also with the correct roll?   
      
   Engine gimabling provides roll control.   
      
   > Thinking about it, there is probably little in common between starship   
   > and super heavy landings in terms of software so probably no attempt at   
   > evaluating roll.   
   >   
   > The latest I saw was 4 grid fins, but at  2 groups of finds 60° apart,   
   > and then 120" between groups. So this definitely requires precise "roll"   
   > when landing to have these grid fins aligned with the cradle so that the   
   > 2 grid fins from each side end up on the cradle.   
   >   
   >   
   > I take it final roll alignement would be done by thrusters on fuselage?   
      
   Possibly.   
      
   Jeff   
   --   
   All opinions posted by me on Usenet News are mine, and mine alone.   
   These posts do not reflect the opinions of my family, friends,   
   employer, or any organization that I am a member of.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)