Identification of photos from Brown - frigate plan and models

[Martes]

There are two photos in the ship design section of the introduction of Brown's "Rebuilding the Royal Navy":

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Is it possible to identify which projects they relate to? The plan on the screen is described as a frigate, and it appears as something between a frigate armed Type 42 and Type 22. The hulls (right - frigate, the largest - a destroyer, according to the book) look as something related to Type 23 era development, but the frigate has a hull mounted (instead of bow mounted) sonar. Could the destroyer hull be related to Type 43? Is there any information about those models at all?

 

[RP1]

The ship in the first image is a Type 22. IIRC the first RN vessel designed to metric standards and using the GODDESS system from the earliest stages.

 

[Martes]

The ship in the first image is a Type 22. IIRC the first RN vessel designed to metric standards and using the GODDESS system from the earliest stages.

Thanks!

Nothing known about the models, though?

 

[Yellow Palace]

I'm sure I've seen some of those models (not the pictures, the actual models!) at work.

The landing craft upper left can only really be the LCM Mark 9. Assuming the rest are broadly contemporary, the frigate on the right is likely to be one of the Type 12/Leander lineage. The large hull centre-right is likely the County class. Centre-left is very slender, making me think it's a wartime destroyer hull, perhaps one of the conversions (Type 15/Type 16).

I have no idea what the four-screw hull bottom left could be, but I'd guess it was something shallow-draught and/or high speed. None of the postwar fast patrol boats had four shafts, though. I do wonder whether it might be the elusive 40-knot Type 19, modelled at half the scale of the other ships to allow high speed testing.

 

[Martes]

The large hull centre-right is likely the County class.

the frigate on the right is likely to be one of the Type 12/Leander lineage.

The transom on both models - to me at least - appears to be much less squarish and closer to inverted arc of Type 23. That's what caught my attention, in fact.

And those double rudders -



So I thought that those models represent some intermediate projects that led to Type 23, on one hand, and maybe the largest hull could hint at Type 43.

 

[TomS]

I have no idea what the four-screw hull bottom left could be, but I'd guess it was something shallow-draught and/or high speed. None of the postwar fast patrol boats had four shafts, though.

There was a proposed 4-shaft diesel version of the Vosper Tenacity 142-ft FPB around 1969-70.

https://www.usni.org/magazines/proceedings/1970/march/missile-armed-fast-patrol-boat

The diesel engine version has four shafts, each driven by either an 18-cylinder English Electric Deltic type unit, with a maximum rating of 3,100 b.h.p. at 2,100 r.p.m.; a 20-cylinder Maybach Mercedes-Benz unit, with a maximum rating of 3,500 b.h.p. at 1,700 r.p.m.; or a 16-cylinder Maybach Mercedes-Benz unit, with a maximum rating of 3,600 b.h.p. at 1,900 r.p.m. They are all turbocharged and uni-directional engines driving through reverse/reduction gearboxes. Electric power at 450 volts a.c. is supplied by three 96 kilovolt-ampere alternators, which are powered by Foden diesel engines.

The pic below is of the CODOG version, but the diesel one was similar, albeit with less superstructure.