SpaceX changed the engines for the SpaceX BFS. They are all using non-vacuum engine nozzles.
This reduces the amount of payload that will be taken to space in the first version. It seems to reduce it from 150 tons to 100 tons.
In order to reduce the development risk and cost. They will only make a sea-level version of the Raptor engine.
There is an outer ring of cargo sections. Each one of the cargo sections can be replaced with a vacuum nozel of the Raptor. You would lose two cargo racks for each vacuum engined Raptor.
Replacing with cargo with vacuum engines will significantly boost the payload capability and power the SpaceX BFR and BFS.
Brian Wang is a prolific business-oriented writer of emerging and disruptive technologies. He is known for insightful articles that combine business and technical analysis that catches the attention of the general public and is also useful for those in the industries. He is the sole author and writer of nextbigfuture.com, the top online science blog. He is also involved in angel investing and raising funds for breakthrough technology startup companies.
He gave the recent keynote presentation at Monte Jade event with a talk entitled the Future for You. He gave an annual update on molecular nanotechnology at Singularity University on nanotechnology, gave a TEDX talk on energy, and advises USC ASTE 527 (advanced space projects program). He has been interviewed for radio, professional organizations. podcasts and corporate events. He was recently interviewed by the radio program Steel on Steel on satellites and high altitude balloons that will track all movement in many parts of the USA.
He fundraises for various high impact technology companies and has worked in computer technology, insurance, healthcare and with corporate finance.
He has substantial familiarity with a broad range of breakthrough technologies like age reversal and antiaging, quantum computers, artificial intelligence, ocean tech, agtech, nuclear fission, advanced nuclear fission, space propulsion, satellites, imaging, molecular nanotechnology, biotechnology, medicine, blockchain, crypto and many other areas.