From: alain245@videotron.ca   
      
   On Jun/18/2021 at 16:35, JF Mezei wrote :   
   > I ask this conceptually, not whether it makes sense or not for SpaceX.   
   >   
   > How difficult would it be to convert Falcon9 from kerosene/Merlin to   
   > Methane/Raptor engines?   
   >   
   > is this a question of rebuilding first stage from scratch and only keep   
   > the grid fins, landing gear and software?   
      
   More like the rebuilding from scratch. I don't think you could keep the   
   software. Maybe the fins and the landing gear. SpaceX also could, if it   
   wanted, keep the Falcon 9 name, else than that not much.   
      
      
   Alain Fournier   
      
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