 Two further ships to this design were ordered on 13 December 1758, at the same time as two ships of a revised design – the .Slade's "Bellona" class was the first class of British 74s to have a gun deck length of , and marked the beginning of a stabilisation of the design of this size of ship.Several subsequent classes designed by Slade were almost identical to the "Bellona" draught, with the main differences restricted to the underwater hull – the most numerous of these being the and classes.