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What is the white spray-pattern residue inside these Falcon Heavy nozzles?


What are these 'Lego' plates inside the Atlas 5 fairing?Why are exhaust flames “jumping around” the bases of the Falcon-9 engine nozzles; NROL-76?Do they assemble the Falcon Heavy on the TEL?What are these yellow devices attached to the Falcon Heavy?What is this object on the Falcon Heavy payload stream?Why the soot pattern on the nosecone of Falcon Heavy side booster?What are these tiles inside the Falcon 9 fairing?Why are these Falcon 9 1st stage bodies (apparently) wrapped in black plastic for transport?What are these flames on the Falcon 9 booster?What are these big shiny metallic “lumps” on the bottom edge of each Falcon Heavy nozzle?













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$begingroup$


What is the white residue in a spray pattern seen on the inside of each nozzle of each side core of this Falcon Heavy image from the Teslarati article SpaceX reveals Falcon Heavy Block 5 in first official photo, timelapse. See also SpaceX tweet.



I'm thinking it could be related to engine shut-down, but it looks like they are assembling a Falcon Heavy for launch, so wouldn't the nozzles have at least been cleaned after the previous launch?



Falcon Heavy (cropped) from Teslarati



Falcon Heavy from Teslarati










share|improve this question











$endgroup$
















    3












    $begingroup$


    What is the white residue in a spray pattern seen on the inside of each nozzle of each side core of this Falcon Heavy image from the Teslarati article SpaceX reveals Falcon Heavy Block 5 in first official photo, timelapse. See also SpaceX tweet.



    I'm thinking it could be related to engine shut-down, but it looks like they are assembling a Falcon Heavy for launch, so wouldn't the nozzles have at least been cleaned after the previous launch?



    Falcon Heavy (cropped) from Teslarati



    Falcon Heavy from Teslarati










    share|improve this question











    $endgroup$














      3












      3








      3





      $begingroup$


      What is the white residue in a spray pattern seen on the inside of each nozzle of each side core of this Falcon Heavy image from the Teslarati article SpaceX reveals Falcon Heavy Block 5 in first official photo, timelapse. See also SpaceX tweet.



      I'm thinking it could be related to engine shut-down, but it looks like they are assembling a Falcon Heavy for launch, so wouldn't the nozzles have at least been cleaned after the previous launch?



      Falcon Heavy (cropped) from Teslarati



      Falcon Heavy from Teslarati










      share|improve this question











      $endgroup$




      What is the white residue in a spray pattern seen on the inside of each nozzle of each side core of this Falcon Heavy image from the Teslarati article SpaceX reveals Falcon Heavy Block 5 in first official photo, timelapse. See also SpaceX tweet.



      I'm thinking it could be related to engine shut-down, but it looks like they are assembling a Falcon Heavy for launch, so wouldn't the nozzles have at least been cleaned after the previous launch?



      Falcon Heavy (cropped) from Teslarati



      Falcon Heavy from Teslarati







      spacex falcon-heavy identify-this-object nozzle merlin-1d






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 2 hours ago







      uhoh

















      asked 2 hours ago









      uhohuhoh

      40.4k18149510




      40.4k18149510




















          1 Answer
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          $begingroup$

          I believe it is residue from the TEA-TEB starting fluid.
          Triethylaluminum combustion produces aluminum oxides, Triethylborane produces boron oxides. Both are shades of white and grey, matching the streaks. Each engine is tested on the stand at McGregor before installation in a booster, and again in the full booster checkout, so there are several opportunities to deposit the waste, even on a new booster.



          They have expressed a goal of zero refurbishment before a typical reflight, which seems to include unnecessary cleaning. They likely have enough data on engine reuse to understand the rate it builds up at, and when it may become a problem.






          share|improve this answer









          $endgroup$








          • 1




            $begingroup$
            This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
            $endgroup$
            – uhoh
            54 mins ago











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          $begingroup$

          I believe it is residue from the TEA-TEB starting fluid.
          Triethylaluminum combustion produces aluminum oxides, Triethylborane produces boron oxides. Both are shades of white and grey, matching the streaks. Each engine is tested on the stand at McGregor before installation in a booster, and again in the full booster checkout, so there are several opportunities to deposit the waste, even on a new booster.



          They have expressed a goal of zero refurbishment before a typical reflight, which seems to include unnecessary cleaning. They likely have enough data on engine reuse to understand the rate it builds up at, and when it may become a problem.






          share|improve this answer









          $endgroup$








          • 1




            $begingroup$
            This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
            $endgroup$
            – uhoh
            54 mins ago















          2












          $begingroup$

          I believe it is residue from the TEA-TEB starting fluid.
          Triethylaluminum combustion produces aluminum oxides, Triethylborane produces boron oxides. Both are shades of white and grey, matching the streaks. Each engine is tested on the stand at McGregor before installation in a booster, and again in the full booster checkout, so there are several opportunities to deposit the waste, even on a new booster.



          They have expressed a goal of zero refurbishment before a typical reflight, which seems to include unnecessary cleaning. They likely have enough data on engine reuse to understand the rate it builds up at, and when it may become a problem.






          share|improve this answer









          $endgroup$








          • 1




            $begingroup$
            This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
            $endgroup$
            – uhoh
            54 mins ago













          2












          2








          2





          $begingroup$

          I believe it is residue from the TEA-TEB starting fluid.
          Triethylaluminum combustion produces aluminum oxides, Triethylborane produces boron oxides. Both are shades of white and grey, matching the streaks. Each engine is tested on the stand at McGregor before installation in a booster, and again in the full booster checkout, so there are several opportunities to deposit the waste, even on a new booster.



          They have expressed a goal of zero refurbishment before a typical reflight, which seems to include unnecessary cleaning. They likely have enough data on engine reuse to understand the rate it builds up at, and when it may become a problem.






          share|improve this answer









          $endgroup$



          I believe it is residue from the TEA-TEB starting fluid.
          Triethylaluminum combustion produces aluminum oxides, Triethylborane produces boron oxides. Both are shades of white and grey, matching the streaks. Each engine is tested on the stand at McGregor before installation in a booster, and again in the full booster checkout, so there are several opportunities to deposit the waste, even on a new booster.



          They have expressed a goal of zero refurbishment before a typical reflight, which seems to include unnecessary cleaning. They likely have enough data on engine reuse to understand the rate it builds up at, and when it may become a problem.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 1 hour ago









          SaibooguSaiboogu

          4,1362129




          4,1362129







          • 1




            $begingroup$
            This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
            $endgroup$
            – uhoh
            54 mins ago












          • 1




            $begingroup$
            This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
            $endgroup$
            – uhoh
            54 mins ago







          1




          1




          $begingroup$
          This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
          $endgroup$
          – uhoh
          54 mins ago




          $begingroup$
          This makes sense (towards zero refurbishment); and the oxides may be quite refractory. I'd wonder if the local change in emissivity could cause temperature gradients and therefore extra stress, but I assume that's been considered.
          $endgroup$
          – uhoh
          54 mins ago

















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