Although the design of engines and propellers is the governing factor, it is possible to vary the power by the number of boilers connected, in the case of a steamship, and the number of diesel engines connected to each shaft in the case of a diesel ship.
Nangona uyilo lwe-injini nesiqhubi iyinto elamlwa ngumbuso, kuyenzeka ukwahlula amandla ngamanani adibanisa isibilisi, kwimeko yenqanawa ekhupha umphunga, nenani le-injini enedizili edibanisayo nganye kwimeko yenqanawa yedizili.