Your calculation on the rocket equation advantage for CF ignores the weight of fuel that must remain for landing. A lighter CF frame also subtracts from the amount of fuel that must be held back, allowing more for payload. This is also a reason it is hard for a hylox first stage to be reusable, the tanks are relatively heavy.
Your calculation on the rocket equation advantage for CF ignores the weight of fuel that must remain for landing. A lighter CF frame also subtracts from the amount of fuel that must be held back, allowing more for payload. This is also a reason it is hard for a hylox first stage to be reusable, the tanks are relatively heavy.