Rincewind wrote:Actually you are not quite right. In the Royal Navy the classification is on the basis of role and NOT by size. Destroyers are Air Defence warships and frigates are either Anti-submarine or general purpose. Also, unlike the United States Navy where all ship capabilities are built around the Carrier Battle Group, Royal Navy frigates are intended for autonomous operations.
Some of our frigates have been quite large ships, larger than destroyers
Though as recently as the 50s the RN used frigates for different specialized roles, having the:
Type 41 or Leopard class anti-aircraft defence frigates
Type 61 Salisbury class aircraft direction (AD) (or radar picket) frigates
Type 12 or Whitby-class anti-submarine frigates
It's just that they found all but the specialized anti-submarine designs to be unsatisfactory - partly because of lack of commonality of parts and equipment, multiplying maintenance and supply issues. Anti-submarine effectiveness justifies some unique hardware for quieting, while also being expensive to include on all ships, where as the other uses really don't so a split between ASW and general purpose ships was determined to still make sense.
And I do wonder how much of the decision to make RN destroyers the air defense specialists had to do with the size ship you needed to carry a useful number of the big missiles needed for useful SAM range in the 60s and 70s. Kind of forced into it by default - though IMO it's stretching things to call a 6,200 ton ship a destroyer in 1962; the County-class air defense destroyer having almost twice the displacement of the contemporary USN Charles F. Adams-class guided missile destroyers. It was almost 15 years before the USN built an anti-air destroyer that large.