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PostPosted: Sat Sep 17, 2022 11:46 am 
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since the 1950s the Royal navy has designated its warship designs with a type number, so type 42 is the sheffield class destroyer, type 82 is bristol class destroyer, type 22 is broadsword class frigate, etc

How are these type numbers assigned? is there a range of numbers reserved for a particular type of ship or class of intended missions?

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PostPosted: Sat Sep 17, 2022 12:31 pm 
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Guided-missile destroyers​
County class: 8 ships (4 Batch I, 4 Batch II), 1961–1967
Type 82: 1 ship (Bristol, 1969) built to trial technology. Eight originally planned to operate with cancelled CVA-01 aircraft carriers.
Type 42: 14 ships (6 Sheffield, 4 Exeter, 4 Manchester), 1971–1983
Type 43: project cancelled at feasibility stage in 1981 Defence White Paper
Type 44: Subclass of Type 43 with better anti-submarine capability.
Type 45: 6 ships, all commissioned between 2009 and 2013
Type 83: Planned to replace Type 45 in 2030s.
https://en.wikipedia.org/wiki/List_of_d ... Royal_Navy

Modern frigates
Type 15 – 23 ships (full rebuilds of World War II destroyer hulls)
Type 16 – 10 ships (partial rebuilds of wartime destroyer hulls)
Type 41 Leopard class – 4 ships
Type 61 Salisbury class – 4 ships
Type 12 Whitby class – 6 ships
Type 12M Rothesay class – 9 ships
Type 12I Leander class – 26 ships (subclasses: 8 Batch 1, 8 Batch 2, 10 Batch 3)
Type 14 Blackwood class – 12 ships
Type 81 Tribal class – 7 ships
Type 21 Amazon class – 8 ships
Type 22 – 14 ships (subclasses: Broadsword 4, Boxer 6, Cornwall 4)
Type 23 Duke class – 16 ships
Type 26 City class – 3 ordered, 8 ships planned
Type 31 frigate – 5 ships planned
Type 32 frigate – 5 ships planned
https://en.wikipedia.org/wiki/List_of_f ... Royal_Navy


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PostPosted: Sat Sep 17, 2022 1:49 pm 
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but how are these numbers assigned? they do not appear to be sequential. for example the soviet/russian project number scheme appears to be roughly sequential in the order with which the design requirements were issued.

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PostPosted: Sun Oct 02, 2022 8:42 am 
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The numbers are sequential, but there are different series of Types and for me it does not appear to be logical in all cases.

ASW/GP Frigates: Type 12 - 32

Anti-aircraft ships: Type 41 - 45

Aircraft direction frigate (?): Type 61

???: Type 81 - 83 (81: sloops of the Tribal class, 82: large guided missile of the Bristol class, 83: large guided missile destroyers replacing the Type 45)


I do not understand the 80s series and I also do not understand, why the Bristol class is Type 82, the Daring class Type 45 and the replacement for the Type 45 is the Type 83...

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PostPosted: Sun Oct 02, 2022 10:46 am 
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This mostly sums it up,

https://en.wikipedia.org/wiki/Type_syst ... Royal_Navy

There were also many design studies and proposals that didn't get a type number and changing design criteria, weapon and sensor system development, and budget constraints and political whims meant definitions were flexible.

After WWII Frigate designs kept growing and Destroyer designs started to look like cruisers then shrank again, so there was an overlap between them which is why you see mixing of the numbers.

The book British Destroyers and Frigates by Norman Friedman goes into the history of the designs in detail if you want to understand the intricacies of each design.

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PostPosted: Sun Oct 02, 2022 11:38 am 
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The Wikipedia explains it also only partially.

Why there is a 30s series of "general purpose frigates" and a 80s series of "general purpose frigates/destroyers/sloops"? And why there there are general purpose frigates between the anti-submarine frigates, e.g. the Type 12I and the Type 21?

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