Inflexible-class ship of the line
The Inflexible-class ships of the line were a class of four 64-gun third rates, designed for the Royal Navy by Sir Thomas Slade. The lines of this class were based heavily on Slade's earlier 74-gun Albion-class. Wikipedia
Length: 159 ft (48 m) (gundeck); 130 ft 7+1⁄2 in (39.8 m) (keel)