Design and specifications
The construction of one vessel was assigned to Deptford Dockyard with the remainder contracted to private builders. The contract dimensional data was a keel length of and a breadth of , producing a builder's measurement tonnage of tons at a contract price of 6.10.0dThe cost accounting for inflation of approximately £ in reference to today per ton; the actual measurements as built are set out below. Soon after their first service, most were modified to have a forecastle added (to protect the upper deck, but not to carry guns) and were girdled (another layer of timbers added on each side), increasing their breadth (and consequently their BM tonnage) and enabling them to carry a heavier armament without jeopardising their stability. The ships were originally to have 34 guns and a manning level of 150, however, this was later increased to 40 guns with 180 men by December 1653, and for the surviving ships by 1666 to 46 guns with 170 men (in ''Foresight'' and ''Assistance'') or to 48 guns with 180 men (in ''Reserve'', ''Advice'' and ''Centurion''). The guns were generallyShips of the 1650 Programme Group
Notes
Citations
References
* British Warships in the Age of Sail (1603 – 1714), by Rif Winfield, published by Seaforth Publishing, England © Rif Winfield 2009, EPUB , Chapter 4, The Fourth Rates - 'Small Ships', Vessels acquired from 24 March 1603, 1650 Programme * Ships of the Royal Navy, by J.J. Colledge, revised and updated by Lt-Cdr Ben Warlow and Steve Bush, published by Seaforth Publishing, Barnsley, Great Britain, © the estate of J.J. Colledge, Ben Warlow and Steve Bush 2020, EPUB * The Arming and Fitting of English Ships of War 1600 - 1815, by Brian Lavery, published by US Naval Institute Press © Brian Lavery 1989, , Part V Guns, Type of Guns {{1650 Programme Group Frigates of the Royal Navy Ships of the Royal Navy