In a reply to the 'Tesla Silicon Valley Owners Club' on the X platform, Elon Musk disclosed that Starship V4 will be equipped with three extra vacuum engines, bringing the total engine count to 42. He pointed out that this number is a nod to the prophecy in "The Hitchhiker's Guide to the Galaxy," where '42' is touted as 'the ultimate answer to life, the universe, and everything.' The power configuration of Starship V4 adheres to SpaceX's design ethos of 'quantity stacking,' which aims to mitigate the risks associated with single-engine failures by incorporating redundancy. Nevertheless, technical hurdles such as resonance suppression and ensuring stable fuel supply amidst a densely packed engine arrangement remain to be addressed.
