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Did some maths.

Musk wants 1 million tons in LEO per year to sustain a Mars city.

BFR-Starship will fly a maximum of 3 times a day from one OLM orbital launch mount.

That's 1100 flights a year.

At 180 mt per flight, total: 200 000 mt so one-fifth of the objective.

So 5 OLMs could do it.

Except the 1 million tons in their Starships are stranded in LEO.

They each need a 1200 mt propellant refueling.

But Starship tanker is 200 mt.

So 6 refuelings per Starship.

And thus six times more OLMs to do that

So total 30 OLMs.

Can such launch area be built ?

 Closest thing is CCAFS & Merritt Island. Which has a comparable number of launch pads.


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