The
Swiftsure was the third of the six "Great Ships" (or
Second rates) to be designed and built at
Deptford Dockyard for
James I's navy by Burrell (as well as three
Third rates and a
Fourth rate). The other Second Rates were the
Constant Reformation,
Victory,
Saint Andrew,
Saint George and
Triumph. The first three ships were designed with a keel length of 103 ft and a beam of 34 ft, but the
Swiftsure was completed with a keel length of 106 ft and a beam of 35 ft 10 in, and later the keel was extended (the overall length remaining unchanged as the rake of the stem and stern was reduced) and the breadth was increased. Her burthen tonnage increased to 924 bm (nominally to 921 tons). Like the other five of Burrell's Second rates, the
Swiftsure was built as a two-decked ship with 42 guns, but during
Charles I's reign a spar deck was added over the upper deck, and later this was hardened to support a third gundeck. By 1652 she carried 60 guns. ==Career==