New BFR Engine arrangement

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Watching the announcement at Space X I was confused about the new engine arrangement. All the nozzles look the same size. Is there still a mixture of vacuum engines and sea level engines? Or did they choose one or the other, or maybe optimized for a compromised mid altitude?










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    Watching the announcement at Space X I was confused about the new engine arrangement. All the nozzles look the same size. Is there still a mixture of vacuum engines and sea level engines? Or did they choose one or the other, or maybe optimized for a compromised mid altitude?










    share|improve this question























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      Watching the announcement at Space X I was confused about the new engine arrangement. All the nozzles look the same size. Is there still a mixture of vacuum engines and sea level engines? Or did they choose one or the other, or maybe optimized for a compromised mid altitude?










      share|improve this question













      Watching the announcement at Space X I was confused about the new engine arrangement. All the nozzles look the same size. Is there still a mixture of vacuum engines and sea level engines? Or did they choose one or the other, or maybe optimized for a compromised mid altitude?







      spacex bfr raptor






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      asked 3 hours ago









      Johnny Robinson

      1,621616




      1,621616




















          3 Answers
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          The engines are all now sea level engines, they removed the vacuum ones from version 1.0 to reduce complexity. They did arrange things such that they can add in more engines if required for the future. The bottom area near the engine nozzles now is for storage.






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            up vote
            2
            down vote













            The bonus cargo capacity that two different engine types would allow wasn't worth the extra development time, money, and complexity for the initial version. It's designed that in later versions vacuum-optimized engines can be added.






            share|improve this answer



























              up vote
              1
              down vote













              This question was actually asked and answered in the announcement itself.



              Elon Musk:




              In order to minimize the development risk and cost we decided to commonize the engine between the booster and the ship. A future upgrade path for BFS would be to have a vacuum-optimized nozzle.



              […]



              Where you see that cargo around the perimeter, you can actually switch out those cargo sections for a vacuum-nozzle version of Raptor.



              […]



              We can do the 100 tons to the surface of Mars with those engines. But version 2 would have the vacuum engines most likely in place of those cargo racks.




              There is no compromise. Those are simply the booster engines. Even with those engines, they will be able to fulfill their goal of 100 tons to the surface of Mars. Removing some of those cargo racks later on and replacing them with vacuum Raptors will then improve on that even further, with better fuel economy meaning smaller tanks (or just less fuel) which "buy back" the loss of those cargo racks.



              The reason for this is to minimize the number of variables and standardize as many parts as possible, which will minimize risk, costs, and development efforts.






              share|improve this answer






















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                3 Answers
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                3 Answers
                3






                active

                oldest

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                active

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                up vote
                2
                down vote













                The engines are all now sea level engines, they removed the vacuum ones from version 1.0 to reduce complexity. They did arrange things such that they can add in more engines if required for the future. The bottom area near the engine nozzles now is for storage.






                share|improve this answer
























                  up vote
                  2
                  down vote













                  The engines are all now sea level engines, they removed the vacuum ones from version 1.0 to reduce complexity. They did arrange things such that they can add in more engines if required for the future. The bottom area near the engine nozzles now is for storage.






                  share|improve this answer






















                    up vote
                    2
                    down vote










                    up vote
                    2
                    down vote









                    The engines are all now sea level engines, they removed the vacuum ones from version 1.0 to reduce complexity. They did arrange things such that they can add in more engines if required for the future. The bottom area near the engine nozzles now is for storage.






                    share|improve this answer












                    The engines are all now sea level engines, they removed the vacuum ones from version 1.0 to reduce complexity. They did arrange things such that they can add in more engines if required for the future. The bottom area near the engine nozzles now is for storage.







                    share|improve this answer












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                    share|improve this answer










                    answered 3 hours ago









                    PearsonArtPhoto♦

                    76.8k16214420




                    76.8k16214420




















                        up vote
                        2
                        down vote













                        The bonus cargo capacity that two different engine types would allow wasn't worth the extra development time, money, and complexity for the initial version. It's designed that in later versions vacuum-optimized engines can be added.






                        share|improve this answer
























                          up vote
                          2
                          down vote













                          The bonus cargo capacity that two different engine types would allow wasn't worth the extra development time, money, and complexity for the initial version. It's designed that in later versions vacuum-optimized engines can be added.






                          share|improve this answer






















                            up vote
                            2
                            down vote










                            up vote
                            2
                            down vote









                            The bonus cargo capacity that two different engine types would allow wasn't worth the extra development time, money, and complexity for the initial version. It's designed that in later versions vacuum-optimized engines can be added.






                            share|improve this answer












                            The bonus cargo capacity that two different engine types would allow wasn't worth the extra development time, money, and complexity for the initial version. It's designed that in later versions vacuum-optimized engines can be added.







                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered 3 hours ago









                            Dragongeek

                            2,429826




                            2,429826




















                                up vote
                                1
                                down vote













                                This question was actually asked and answered in the announcement itself.



                                Elon Musk:




                                In order to minimize the development risk and cost we decided to commonize the engine between the booster and the ship. A future upgrade path for BFS would be to have a vacuum-optimized nozzle.



                                […]



                                Where you see that cargo around the perimeter, you can actually switch out those cargo sections for a vacuum-nozzle version of Raptor.



                                […]



                                We can do the 100 tons to the surface of Mars with those engines. But version 2 would have the vacuum engines most likely in place of those cargo racks.




                                There is no compromise. Those are simply the booster engines. Even with those engines, they will be able to fulfill their goal of 100 tons to the surface of Mars. Removing some of those cargo racks later on and replacing them with vacuum Raptors will then improve on that even further, with better fuel economy meaning smaller tanks (or just less fuel) which "buy back" the loss of those cargo racks.



                                The reason for this is to minimize the number of variables and standardize as many parts as possible, which will minimize risk, costs, and development efforts.






                                share|improve this answer


























                                  up vote
                                  1
                                  down vote













                                  This question was actually asked and answered in the announcement itself.



                                  Elon Musk:




                                  In order to minimize the development risk and cost we decided to commonize the engine between the booster and the ship. A future upgrade path for BFS would be to have a vacuum-optimized nozzle.



                                  […]



                                  Where you see that cargo around the perimeter, you can actually switch out those cargo sections for a vacuum-nozzle version of Raptor.



                                  […]



                                  We can do the 100 tons to the surface of Mars with those engines. But version 2 would have the vacuum engines most likely in place of those cargo racks.




                                  There is no compromise. Those are simply the booster engines. Even with those engines, they will be able to fulfill their goal of 100 tons to the surface of Mars. Removing some of those cargo racks later on and replacing them with vacuum Raptors will then improve on that even further, with better fuel economy meaning smaller tanks (or just less fuel) which "buy back" the loss of those cargo racks.



                                  The reason for this is to minimize the number of variables and standardize as many parts as possible, which will minimize risk, costs, and development efforts.






                                  share|improve this answer
























                                    up vote
                                    1
                                    down vote










                                    up vote
                                    1
                                    down vote









                                    This question was actually asked and answered in the announcement itself.



                                    Elon Musk:




                                    In order to minimize the development risk and cost we decided to commonize the engine between the booster and the ship. A future upgrade path for BFS would be to have a vacuum-optimized nozzle.



                                    […]



                                    Where you see that cargo around the perimeter, you can actually switch out those cargo sections for a vacuum-nozzle version of Raptor.



                                    […]



                                    We can do the 100 tons to the surface of Mars with those engines. But version 2 would have the vacuum engines most likely in place of those cargo racks.




                                    There is no compromise. Those are simply the booster engines. Even with those engines, they will be able to fulfill their goal of 100 tons to the surface of Mars. Removing some of those cargo racks later on and replacing them with vacuum Raptors will then improve on that even further, with better fuel economy meaning smaller tanks (or just less fuel) which "buy back" the loss of those cargo racks.



                                    The reason for this is to minimize the number of variables and standardize as many parts as possible, which will minimize risk, costs, and development efforts.






                                    share|improve this answer














                                    This question was actually asked and answered in the announcement itself.



                                    Elon Musk:




                                    In order to minimize the development risk and cost we decided to commonize the engine between the booster and the ship. A future upgrade path for BFS would be to have a vacuum-optimized nozzle.



                                    […]



                                    Where you see that cargo around the perimeter, you can actually switch out those cargo sections for a vacuum-nozzle version of Raptor.



                                    […]



                                    We can do the 100 tons to the surface of Mars with those engines. But version 2 would have the vacuum engines most likely in place of those cargo racks.




                                    There is no compromise. Those are simply the booster engines. Even with those engines, they will be able to fulfill their goal of 100 tons to the surface of Mars. Removing some of those cargo racks later on and replacing them with vacuum Raptors will then improve on that even further, with better fuel economy meaning smaller tanks (or just less fuel) which "buy back" the loss of those cargo racks.



                                    The reason for this is to minimize the number of variables and standardize as many parts as possible, which will minimize risk, costs, and development efforts.







                                    share|improve this answer














                                    share|improve this answer



                                    share|improve this answer








                                    edited 9 mins ago

























                                    answered 27 mins ago









                                    Jörg W Mittag

                                    738510




                                    738510



























                                         

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