Originally Posted by
FlightDetent
Would the weight of burnt H2 be an issue? Present designs are well tolerant for using up the fossil load. Quite significant sometimes.
My assumption is containers for liquified gas introduce the new angle, but those would stay for the full duration of the flight.
H2 has 3 times the energy density of fossil fuels PER KILO. So ideally, the fuel mass should only be a third for the same stored energy, ignoring all other factors (storage, efficiency ...)