Why did nobody use it before the Raptor?
I understand why Raptors use methalox, as it can be produced on Mars. But many of these new rockets are not destined to be refueled on Mars.
I understand why Raptors use methalox, as it can be produced on Mars. But many of these new rockets are not destined to be refueled on Mars.
It’s not the best choice for an high-budget high-performance expendable multi-stage rocket. Using kerolox/SRBs in the first stage and hydrolox in the second stage gives better overall performance.
Metholox is better for re-use, using the same engine in multiple stages lowers costs and complexity, and you can produce the fuel on Mars.