A wartime three-to-one rotation provides the planning baseline: one ship deployed, one training or in transit, and one in maintenance. Seven standing deployments therefore imply at least twenty-one hulls, while a sensible navy adds slack rather than treating that minimum as a target. The illustrative Royal Navy mix is eight air-defence escorts, twelve anti-submarine frigates, eight presence or flak frigates, and eight mine-warfare and uncrewed-systems support ships, for thirty-six vessels. Twenty would be first-rate combatants, while the remainder would support task groups and persistent presence. Missions, readiness cycles, and reserve capacity should drive fleet size instead of a count of ships immediately at sea.
Notable Point · 1:08:08-1:11:54
From deployment ratios to a 36-hull Royal Navy mix
A three-to-one rotation and seven standing tasks lead to a notional 36-ship mix with spare capacity for maintenance and unplanned work.