Staging(Cont) n=payload fraction= payload or 2=Payload Ol Mpavload i mass of payload plus all upper stages Structure fraction a. 4 MM+mtm Ol payload l Msi= mass structure for stage i Mri mass propellant for stage iStaging (Cont.) O = payload fraction = or Mpayload i = mass of payload plus all upper stages Structure fraction Msi = mass structure for stage i Mpi = mass propellant for stage i Mpayload Mo O i Mpayload moi i O 3 i 1 n O i H si Msi Moi Msi Mpi Msi Mpayload i