Which propellant system typically achieves an $ ext{Isp}$ around 350 seconds?

Answer

$ ext{RP-1}$

Liquid $ ext{RP-1}$ usually falls slightly below 350 seconds in specific impulse, placing it lower than both liquid methane (around 370 seconds) and liquid hydrogen (around 450 seconds).

Which propellant system typically achieves an $	ext{Isp}$ around 350 seconds?
fuelrocketpropellantcombustionMethane