Higher potential efficiency than most, dependent on the engine. Hydrogen is higher but much less dense and harder to work with (the SLS leaking all over the place was the tiny hydrogen molecules finding their way out). The higher volume of hydrogen means a bigger tank and more mass. Methane is also cleaner burning than kerosene based RP-1 so less likely to clog things up and better for the environment.
smolpnrg t1_j1xxjbg wrote
Reply to comment by QuimmLord in Historic first launch of Chinese private methane-fueled rocket ends in failure by returnofjuju
Higher potential efficiency than most, dependent on the engine. Hydrogen is higher but much less dense and harder to work with (the SLS leaking all over the place was the tiny hydrogen molecules finding their way out). The higher volume of hydrogen means a bigger tank and more mass. Methane is also cleaner burning than kerosene based RP-1 so less likely to clog things up and better for the environment.