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The 1651 Programme of five 410-ton fourth-rate vessels was urged by the Council of State all speed should be made in completing the ships in May 1650. Initially five vessels were specified, three of 410 tons at 6.10.0d (accounting for inflation £0 per ton and two of 600 tons at £7.10.0d (accounting for inflation £0 per ton. The size of these vessels grew from the 1647 predecessors with 600 tonners being much broader. The three 410-ton vessels would be completed as 34-gun frigates (or fourth rates).

Second Rate Vessel
The construction of the vessels was assigned to Portsmouth Dockyard with one vessel contracted to Peter Pett I of Ratcliff. The dimensional data was so varied that it will be listed on the individual vessels along with their gun armament composition.

Fourth Rates
This pair of two 600 ton Fourth Rate vessels, also known as the Ruby Group were part of the 1651 Programme. Initially five vessels were specified, three of 410 tons at 6.10.0d (accounting for inflation £0) per ton and two of 600 tons at £7.10.0d (accounting for inflation £0) per ton. The size of these vessels grew from the 1647 predecessors with 600 tonners being much broader. The two 600-ton vessels would be completed as 42-gun Fourth Rates.

Sixth Rates
On 5 December 1651, the Admiralty Committee issued an order to build three small vessels to ply the sands and flats for pirates. The three vessels would carry fourteen guns with a crew of 90 personnel. These vessels were sometimes referred to as gallies.