http://apcnasa3ozl2j74htizuzba5b6nhugbg2qze2nrz43siunkct555fpid.onion
However, it is not just M b that is of interest, but rather the amount of useful payload mass, M PL , that is contained in M b . Specifically, the mass after the burn, M b , is the sum of the payload mass, M PL , plus the dry (empty) weight of the whole propulsion system, M Dry , which is in turn made up of the weight of tanks, engines, pumps, structure,...