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.
Yeah, it is just a ballpark figure though. A lot of that calculation is wrong. You have to take into account payload and rocket engines as well which will not be 1/4th the weight. But I have thought about writing a dedicated article focusing on doing this calculation more properly.
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.
Yeah, it is just a ballpark figure though. A lot of that calculation is wrong. You have to take into account payload and rocket engines as well which will not be 1/4th the weight. But I have thought about writing a dedicated article focusing on doing this calculation more properly.