What is the white spray-pattern residue inside these Falcon Heavy nozzles?What are these 'Lego' plates inside...

What is the command to reset a PC without deleting any files

What typically incentivizes a professor to change jobs to a lower ranking university?

"which" command doesn't work / path of Safari?

The use of multiple foreign keys on same column in SQL Server

Calculus Optimization - Point on graph closest to given point

Is there really no realistic way for a skeleton monster to move around without magic?

Why is the design of haulage companies so “special”?

Are there any consumables that function as addictive (psychedelic) drugs?

Do airline pilots ever risk not hearing communication directed to them specifically, from traffic controllers?

I see my dog run

How do we improve the relationship with a client software team that performs poorly and is becoming less collaborative?

whey we use polarized capacitor?

How to calculate implied correlation via observed market price (Margrabe option)

When blogging recipes, how can I support both readers who want the narrative/journey and ones who want the printer-friendly recipe?

Why CLRS example on residual networks does not follows its formula?

How is this relation reflexive?

How can I fix this gap between bookcases I made?

Could a US political party gain complete control over the government by removing checks & balances?

Banach space and Hilbert space topology

Draw simple lines in Inkscape

How old can references or sources in a thesis be?

What is the offset in a seaplane's hull?

A Journey Through Space and Time

A newer friend of my brother's gave him a load of baseball cards that are supposedly extremely valuable. Is this a scam?



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?













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












    $begingroup$


    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
          1






          active

          oldest

          votes


















          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
            47 mins ago












          Your Answer





          StackExchange.ifUsing("editor", function () {
          return StackExchange.using("mathjaxEditing", function () {
          StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
          StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
          });
          });
          }, "mathjax-editing");

          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "508"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: false,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: null,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          noCode: true, onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });














          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fspace.stackexchange.com%2fquestions%2f35355%2fwhat-is-the-white-spray-pattern-residue-inside-these-falcon-heavy-nozzles%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          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
            47 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
            47 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 55 mins 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
            47 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
            47 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
          47 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
          47 mins ago


















          draft saved

          draft discarded




















































          Thanks for contributing an answer to Space Exploration Stack Exchange!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          Use MathJax to format equations. MathJax reference.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fspace.stackexchange.com%2fquestions%2f35355%2fwhat-is-the-white-spray-pattern-residue-inside-these-falcon-heavy-nozzles%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          Popular posts from this blog

          Why do type traits not work with types in namespace scope?What are POD types in C++?Why can templates only be...

          Will tsunami waves travel forever if there was no land?Why do tsunami waves begin with the water flowing away...

          Simple Scan not detecting my scanner (Brother DCP-7055W)Brother MFC-L2700DW printer can print, can't...