Engine ignition for all Raptor engines, both on the pad and in the air, will be by spark ignition, which will eliminate the pyrophoric mixture of triethylaluminum-triethylborane пишет википедия
Engine ignition for all Raptor engines, both on the pad and in the air, will be by spark ignition, which will eliminate the pyrophoric mixture of triethylaluminum-triethylborane пишет википедия
The green glow in the exhaust near the end of the firing indicates the copper liner in the engine chamber burned by accident. While this should not have happened, it’s precisely to find these pain points that engineers conduct test firings in the first place. https://www.extremetech.com/extreme/285129-spacex-fires-mars-bound-raptor-engine