ww1 and ww2 monitor designs

[Object-911]

Hello, i would like to learn more about ww1 or ww2 monitors that were prototype or never left the drawing board, river monitors or sea worthy monitors are what im looking for. If possible can you provide pictures or documents please (this is my first post here and i would like to learn more about these kind of warships).

 

[Tzoli]

Which navy you are interested in?
In a couple of days I can make a list of designs, but drawings are very rare.

 

[Object-911]

Which navy you are interested in?
In a couple of days I can make a list of designs, but drawings are very rare.

Any navy i dont mind at all, i dont mind if there are no any drawings and a list is fine.

 

[cattalonX]

Russian design using Izmir class battlecruiser turrets

early concept design of Deutschland

 

[Tzoli]

Okay, here is the list:

Austro-Hungarian Navy:
Danube / Donau / Duna class River Monitor Design (No.XI and XII) - 1917
Dimensions: 73,90m wl x 73,90m oa x 13,00m x 1,70m
Speed: 19km/h
Engines: 2.100shp/2-shafts, likely Yarrow Boilers (2) Vertical Triple Expansion Engines (Yarrow)
Displacment: 1.240tons standard
Armaments:
2x1 190mm/35 L/35 K18 Guns
2x2 88mm/45 L/45 K12 TAG Guns
1x1 88mm/45 L/45 K16 BAG AA guns
Armour: 25mm Deck, 40mm Belt over Machinery

Adria type Coastal Monitor Design - 1917
Dimensions: Unknown
Speed: Unknown
Engines: Unknown
Displacment: 1.500tons standard
Armaments:
2x1 238mm/40 L/40 K01 Cannons
Other armament Unknown
Armour: Unknown


Germany:
Hans Zenker Design I/35 Ocean Going Monitor Design (Likely Ocean Going) - 1925
Dimensions: Unknown
Speed: 35km/h
Engines: 16.000shp/2-shafts, likely Diesel Engines (MAN)
Displacment: 10.000tons standard
Armaments:
1x3 350mm/52 SK C/25 Cannons
2x2 149mm/61 SK C/25 Guns
4x1 88mm/75 SK C/25 AA guns
Armour: 300mm Belt


Italy:
Edgardo Ferrati Project 1 Ocean Going Monitor Design - 1920
Dimensions: Unknown
Speed: 37km/h
Engines: 24.000shp/2 or 4-shafts, Steam Turbine Engines (Parsons)
Displacment: 18.500tons standard
Armaments:
2x2 381mm/40 Schneider-Ansaldo Modello 1914 or 381mm/45 Vickers Mark B Cannons
4x2 120mm/45 Schneider-Armstrong Modello 1919 Guns
4x1 105mm/45 Schneider-Armstrong Modello 1919 AA guns
Armour: 150mm Deck and 150mm Belt

Edgardo Ferrati Project 2A Ocean Going Monitor Design - 1920
Dimensions: Unknown
Speed: 33km/h
Engines: 24.000shp/2 or 4-shafts, Steam Turbine Engines (Parsons)
Displacment: 21.500tons standard
Armaments:
2x3 381mm/40 Schneider-Ansaldo Modello 1914 or 381mm/45 Vickers Mark B Cannons
2x1 105mm/45 Schneider-Armstrong Modello 1919 AA guns
Armour: 150mm Deck and 150mm Belt

Edgardo Ferrati Project 2B Ocean Going Monitor Design - 1920
Dimensions: 150,00m oa x 29,00m x 10,00m
Speed: 33km/h
Engines: 24.000shp/2 or 4-shafts, Steam Turbine Engines (Parsons)
Displacment: 22.000tons standard, 25.000tons full load
Armaments:
2x3 381mm/40 Schneider-Ansaldo Modello 1914 or 381mm/45 Vickers Mark B Cannons
4x2 120mm/45 Schneider-Armstrong Modello 1919 Guns
4x1 105mm/45 Schneider-Armstrong Modello 1919 AA guns
Armour: 150mm Deck and 150mm Belt

Edgardo Ferrati Project 3A Ocean Going Monitor Design - 1920
Dimensions: Unknown
Speed: 35km/h
Engines: 24.000shp/2 or 4-shafts, Steam Turbine Engines (Parsons)
Displacment: 21.600tons standard
Armaments:
2x2 381mm/40 Schneider-Ansaldo Modello 1914 or 381mm/45 Vickers Mark B Cannons
4x2 120mm/45 Schneider-Armstrong Modello 1919 Guns
4x1 105mm/45 Schneider-Armstrong Modello 1919 AA guns
Armour: 150mm Deck and 150mm Belt

Edgardo Ferrati Project 3B Ocean Going Monitor Design - 1920
Dimensions: Unknown
Speed: 33km/h
Engines: 24.000shp/2 or 4-shafts, Steam Turbine Engines (Parsons)
Displacment: 21.000tons standard
Armaments:
2x3 381mm/40 Schneider-Ansaldo Modello 1914 or 381mm/45 Vickers Mark B Cannons
4x2 120mm/45 Schneider-Armstrong Modello 1919 Guns
4x1 105mm/45 Schneider-Armstrong Modello 1919 AA guns
Armour: 150mm Deck and 150mm Belt


Russia:
Putilov Design 1915 Ocean Going Monitor Design - 1915
Dimensions: 89,91m pp x 92,96m wl x 92,96m oa x 17,68m x 3,66m
Speed: 26km/h
Range: 8.300km
Engines: 3.200shp/2-shafts probably Belleville Boilers (6) Vertical Triple Expansion Engines (Belleville)
Displacment: 3.995tons standard
Armaments:
1x2 305mm/52 Pattern 1907 Cannons
4x2 120mm/50 Pattern 1905 Guns
Armour: 64mm Deck and 165mm Belt

Design 1915 Variant 1 Ocean Going Monitor Design - 1915/16
Dimensions: 100m wl x 100m oa x 20m x 4,88m
Speed: 22km/h
Engines: 3.000shp/3-shafts likely Diesel Engines (Kolomna)
Displacment: 7.4000tons standard
Armaments:
1x3 356mm/52 Pattern 1913 Cannons
6x1 152mm/50 Pattern 1908 Guns
2x1 63mm/38 Pattern 1916 AA Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
2x1 533mm Torpedo Tubes
Armour: 75mm Deck and 275mm Belt

Design 1915 Variant 2 Ocean Going Monitor Design - 1915/16
Dimensions: 100m wl x 100m oa x 20m x 4,88m
Speed: 22km/h
Engines: 3.000shp/3-shafts likely Diesel Engines (Kolomna)
Displacment: 7.550tons standard
Armaments:
1x3 356mm/52 Pattern 1913 Cannons
8x1 152mm/50 Pattern 1908 Guns
2x1 63mm/38 Pattern 1916 AA Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
2x1 533mm Torpedo Tubes
Armour: 75mm Deck and 275mm Belt

Design 1915 Variant 3 Ocean Going Monitor Design - 1915/16
Dimensions: 100m wl x 100m oa x 20m x 4,88m
Speed: 22km/h
Engines: 3.000shp/3-shafts likely Diesel Engines (Kolomna)
Displacment: 7.550tons standard
Armaments:
1x3 356mm/52 Pattern 1913 Cannons
8x1 152mm/50 Pattern 1908 Guns
2x1 63mm/38 Pattern 1916 AA Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
2x1 533mm Torpedo Tubes
Armour: 75mm Deck and 275mm Belt

Design 1915 Riverine Monitor Design - 1915
Dimensions: 80m wl x 80m oa x 15m x 1,5m
Speed: 19km/h
Range: 5.500km
Engines: Unknown probably Vertical Compound Engines (Baltic Works) or Vertical Triple Expansion Engines (Belleville)
Displacment: 1.400tons standard
Armaments:
3x2 120mm/50 Pattern 1905 Guns
Other Guns Unknown
Armour: Unknown

Design 1915 Variant 1 (6 inch) Riverine Monitor Design - 1915
Dimensions: 85,34m wl x 85,34m oa x 14,93m x 1,74m
Speed: 20km/h
Engines: 1.450shp/2-shafts probably Belleville Boilers (3) Vertical Triple Expansion Engines (Belleville)
Displacment: 1.750tons standard
Armaments:
1x2 152mm/50 Pattern 1908 Guns
2x1 152mm/22 Pattern 1877 Howitzers
4x1 102mm/60 Pattern 1908 Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
Armour: 38mm Deck and 76mm Belt

Design 1915 Variant 1 (8 inch) Riverine Monitor Design - 1915
Dimensions: 85,34m wl x 85,34m oa x 14,93m x 1,90m
Speed: 20km/h
Engines: 1.500shp/2-shafts probably Belleville Boilers (3) Vertical Triple Expansion Engines (Belleville)
Displacment: 1.900tons standard
Armaments:
1x2 203mm/50 Pattern 1905 Guns
4x1 102mm/60 Pattern 1908 Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
Armour: 38mm Deck and 76mm Belt

Design 1915 Variant 2 (6 inch) Riverine Monitor Design - 1915
Dimensions: 89,92m wl x 89,92m oa x 15,70m x 1,75m
Speed: 20km/h
Engines: 1.500shp/2-shafts probably Belleville Boilers (3) Vertical Triple Expansion Engines (Belleville)
Displacment: 1.950tons standard
Armaments:
1x2 152mm/50 Pattern 1908 Guns
2x1 152mm/22 Pattern 1877 Howitzers
4x1 102mm/60 Pattern 1908 Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
Armour: 38mm Deck and 76mm Belt

Design 1915 Variant 2 (8 inch) Riverine Monitor Design - 1915
Dimensions: 89,92m wl x 89,92m oa x 15,70m x 1,90m
Speed: 20km/h
Engines: 1.600shp/2-shafts probably Belleville Boilers (3) Vertical Triple Expansion Engines (Belleville)
Displacment: 2.150tons standard
Armaments:
1x2 203mm/50 Pattern 1905 Guns
4x1 102mm/60 Pattern 1908 Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
Armour: 38mm Deck and 76mm Belt

Design 1915 Variant 3 (6 inch) Riverine Monitor Design - 1915
Dimensions: 96,01m wl x 96,01m oa x 16,61m x 1,76m
Speed: 20km/h
Engines: 1.600shp/2-shafts probably Belleville Boilers (3) Vertical Triple Expansion Engines (Belleville)
Displacment: 2.150tons standard
Armaments:
1x2,1x1 152mm/50 Pattern 1908 Guns
4x1 152mm/22 Pattern 1877 Howitzers
4x1 102mm/60 Pattern 1908 Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
Armour: 38mm Deck and 76mm Belt

Design 1915 Variant 3 (8 inch) Riverine Monitor Design - 1915
Dimensions: 96,01m wl x 96,01m oa x 16,61m x 1,91m
Speed: 20km/h
Engines: 1.700shp/2-shafts probably Belleville Boilers (4) Vertical Triple Expansion Engines (Belleville)
Displacment: 2.400tons standard
Armaments:
1x2,1x1 203mm/50 Pattern 1905 Guns
4x1 102mm/60 Pattern 1908 Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
Armour: 38mm Deck and 76mm Belt

Design 1915 Variant 4 (6 inch) Riverine Monitor Design - 1915
Dimensions: 97,54m wl x 97,54m oa x 17,37m x 1,77m
Speed: 20km/h
Engines: 1.700shp/2-shafts probably Belleville Boilers (4) Vertical Triple Expansion Engines (Belleville)
Displacment: 2.350tons standard
Armaments:
2x2 152mm/50 Pattern 1908 Guns
4x1 152mm/22 Pattern 1877 Howitzers
4x1 102mm/60 Pattern 1908 Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
Armour: 38mm Deck and 76mm Belt

Design 1915 Variant 4 (8 inch) Riverine Monitor Design - 1915
Dimensions: 97,54m wl x 97,54m oa x 17,37m x 1,93m
Speed: 20km/h
Engines: 1.800shp/2-shafts probably Belleville Boilers (4) Vertical Triple Expansion Engines (Belleville)
Displacment: 2.600tons standard
Armaments:
2x2 203mm/50 Pattern 1905 Guns
4x1 102mm/60 Pattern 1908 Guns
2x small calibre likely 40mm/39 2pdr QF Mk II AA Guns
Armour: 38mm Deck and 76mm Belt


Sweden:
Bärsärk Coastal Monitor Design - 1934
Dimensions: 120m oa x 24m x 3,6m
Speed: 22km/h
Engines: 6.000shp/2-shafts probably Penhoët Boilers (2) Steam Turbine Engines (de Laval)
Displacment: 8.000tons full load
Armaments:
1x2 381mm Cannon, unknown type
3x2 105mm/40 Bofors m/36 AA Guns
4x2 25mm/64 Bofors m/32 AA Guns
Armour: 125mm Deck and 200mm Belt

Design 1941 Coastal Monitor Design - 1941
Dimensions: 108m wl x 111m oa x 20m x 8,5m
Speed: 33km/h
Range: 2.800km
Engines: 11.000shp/3-shafts likely Diesel Engines (Götaverken)
Displacment: 6.900tons standard, 7.100tons full load
Armaments:
1x3 209mm/50 Bofors m/36 Guns
4x2 57mm/50 Finspång m/89B AA Guns
10x1 25mm/64 Bofors m/32 AA Guns
Armour: 70mm Deck and 125mm Belt

Design 1945 Variant 1 Coastal Monitor Design - 1945
Dimensions: 102m wl x x 25,4m x 5,1m
Speed: 19km/h
Range: 4.600km
Engines: 3.000shp/2-shafts likely Diesel Engines (Götaverken)
Displacment: 10.000tons standard
Armaments:
1x3 209mm/50 Bofors m/36 Guns
8x2 57mm/60 Bofors m/47 AA Guns
Armour: 125mm Deck and 240mm Belt

Design 1945 Variant 2 Coastal Monitor Design - 1945
Dimensions: 120m wl x x 30m x 6m
Speed: 19km/h
Range: 3.700km
Engines: 5.000shp/2-shafts likely Diesel Engines (Götaverken)
Displacment: 16.500tons standard
Armaments:
1x3 356mm Cannon, unknown type
8x2 57mm/60 Bofors m/47 AA Guns
Armour: 200mm Deck and 400mm Belt


USA:
Design 1917 Scheme 1 Coastal Monitor Design - 1917
Dimensions: 182,88m oa x x 32,92m x 4,12m
Speed: 11km/h
Range: 9.400km
Engines: 1.000shp/2-shafts probably Babcock & Wilcox Boilers (2) Horinzontal Compund Expansion Engines (Babcock & Wilcox)
Displacment: 20.500tons standard
Armaments:
2x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 102mm over Machinery 127mm Over Magazines Deck and 457mm Belt

Design 1917 Scheme 2 Coastal Monitor Design - 1917
Dimensions: 198,12m oa x x 39,62m x 4,57m
Speed: 11km/h
Engines: Unknown
Displacment: 33.000tons standard
Armaments:
4x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 79mm over Machinery 127mm Over Magazines Deck and 457mm Belt

Design 1917 Scheme 3 Coastal Monitor Design - 1917
Dimensions: 198,12m oa x x 32,92m x 4,42m
Speed: 11km/h
Range: 10.200km
Engines: 1.250shp/2-shafts probably Babcock & Wilcox Boilers (2) Horinzontal Compund Expansion Engines (Babcock & Wilcox)
Displacment: 26.000tons standard
Armaments:
4x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 102mm over Machinery 127mm Over Magazines Deck and 457mm Belt

Design 1917 Scheme 4 Coastal Monitor Design - 1917
Dimensions: 228,6m oa x x 39,62m x 5,18m
Speed: 11km/h
Range: 8.000km
Engines: 1.800shp/2-shafts probably Babcock & Wilcox Boilers (2) Horinzontal Compund Expansion Engines (Babcock & Wilcox)
Displacment: 43.000tons standard
Armaments:
4x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 79mm over Machinery 127mm Over Magazines Deck and 457mm Belt

Design 1917 Scheme 5 Coastal Monitor Design - 1917
Dimensions: 137,16m oa x x 32,92m x 6,93m
Speed: 22km/h
Range: 11.100km
Engines: 2.450shp/2-shafts probably Babcock & Wilcox Boilers (2) Horinzontal Compund Expansion Engines (Babcock & Wilcox)
Displacment: 22.750tons standard
Armaments:
4x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 127mm Deck and 457mm Belt

Design 1917 Scheme 6 Coastal Monitor Design - 1917
Dimensions: 137,16m oa x x 32,92m x 5,03m
Speed: 22km/h
Range: 9.400km
Engines: 1.800shp/2-shafts probably Babcock & Wilcox Boilers (2) Horinzontal Compund Expansion Engines (Babcock & Wilcox)
Displacment: 16.800tons standard
Armaments:
1x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 127mm Deck and 457mm Belt

The British designs will be in a different post.

 

[Dilandu]

Russian design using Izmir class battlecruiser turrets

It's Izmail, not Izmir.

 

[Tzoli]

Some drawings:
Silvius Morin's Monitor Project from 1917, likely an alternative to the Danube class:

Official drawings of one of the preliminaries (without AA guns and thus enlarged aft superstructure):
https://dreadnoughtproject.org/plans/1235_ton_Monitor_1916/langenschnitt_100dpi.jpghttps://dreadnoughtproject.org/plans/1235_ton_Monitor_1916/dranfsicht_100dpi.jpg
F. Cossutta's Siege Monitor proposal:

 

[Tzoli]

Russian:
Design 1916 Super Monitor / Coastal Battleship:

 

[Tzoli]

Swedish Barsark:

 

[Nik]

Was it Brazil that had / has a littoral 'Vest-Pocket Battle-Cruiser' that almost qualifies as a 'Monitor' ??

 

[Tzoli]

Was it Brazil that had / has a littoral 'Vest-Pocket Battle-Cruiser' that almost qualifies as a 'Monitor' ??

Huh?

 

[Object-911]

Thank you for providing these and this is very useful list and thanks for the pictures

 

[Scott Kenny]

USA:
Design 1917 Scheme 1 Coastal Monitor Design - 1917
Dimensions: 182,88m oa x x 32,92m x 4,12m
Speed: 11km/h
Range: 9.400km
Engines: 1.000shp/2-shafts probably Babcock & Wilcox Boilers (2) Horinzontal Compund Expansion Engines (Babcock & Wilcox)
Displacment: 20.500tons standard
Armaments:
2x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 102mm over Magazines 127mm Over Machinery Deck and 457mm Belt

Design 1917 Scheme 2 Coastal Monitor Design - 1917
Dimensions: 198,12m oa x x 39,62m x 4,57m
Speed: 11km/h
Engines: Unknown
Displacment: 33.000tons standard
Armaments:
4x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 79mm over Magazines 127mm Over Machinery Deck and 457mm Belt

Design 1917 Scheme 3 Coastal Monitor Design - 1917
Dimensions: 198,12m oa x x 32,92m x 4,42m
Speed: 11km/h
Range: 10.200km
Engines: 1.250shp/2-shafts probably Babcock & Wilcox Boilers (2) Horinzontal Compund Expansion Engines (Babcock & Wilcox)
Displacment: 26.000tons standard
Armaments:
4x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 102mm over Magazines 127mm Over Machinery Deck and 457mm Belt

Design 1917 Scheme 4 Coastal Monitor Design - 1917
Dimensions: 228,6m oa x x 39,62m x 5,18m
Speed: 11km/h
Range: 8.000km
Engines: 1.800shp/2-shafts probably Babcock & Wilcox Boilers (2) Horinzontal Compund Expansion Engines (Babcock & Wilcox)
Displacment: 43.000tons standard
Armaments:
4x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 79mm over Magazines 127mm Over Machinery Deck and 457mm Belt

Those are some odd designs. 11kph? Also, only 5x secondary guns? Total?

Design 1917 Scheme 5 Coastal Monitor Design - 1917
Dimensions: 137,16m oa x x 32,92m x 6,93m
Speed: 22km/h
Range: 11.100km
Engines: 2.450shp/2-shafts probably Babcock & Wilcox Boilers (2) Horinzontal Compund Expansion Engines (Babcock & Wilcox)
Displacment: 22.750tons standard
Armaments:
4x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 127mm Deck and 457mm Belt

Design 1917 Scheme 6 Coastal Monitor Design - 1917
Dimensions: 137,16m oa x x 32,92m x 5,03m
Speed: 22km/h
Range: 9.400km
Engines: 1.800shp/2-shafts probably Babcock & Wilcox Boilers (2) Horinzontal Compund Expansion Engines (Babcock & Wilcox)
Displacment: 16.800tons standard
Armaments:
1x2 16"/50 Mark 2 Cannons
5x1 5"/51 Mark 8 Guns
Armour: 127mm Deck and 457mm Belt

Speed is a lot more reasonable here (if only to be able to hold position in and even move against either strong currents or river channels), but I'm still confused by the 5 secondary guns. I'm assuming 4 guns in casemate and 1 on a pedestal?

Do you have any sketches or Shipbucket illustrations?

 

[Tzoli]

British:
15in Monitor Design Coastal Monitor Design - 1914
Dimensions: 115,82m pp x 123,44m oa x 26,82m x 3,35m
Speed: 22km/h
Engines: 6.000shp/2-shafts likely Babcock & Wilcox Boilers (4) Steam Turbine engines (Parsons)
Displacement: 8.000tons standard
Armaments:
1x2 15"/42 BL Mark I Cannons
2x1 6"/50 BL Mk XVIII Guns
2x1 3"/50 23cwt QF Mk I Guns
2x1 3"/45 QF HA Mk I AA Guns
4x1 40mm/39 QF Mk II AA Guns
Armour: 51mm over Magazines 25mm Over Machinery Deck and 102mm

12in Monitor Design Coastal Monitor Design - 1914
Dimensions: 97,54m pp x 102,00m wl x 102,00m oa x 27,43m x 3,05m
Speed: 13km/h
Engines: 2.000shp/2-shafts likely Babcock & Wilcox Boilers (2) Vertical Triple Expansion engines (Babcock & Wilcox)
Displacement: 5.650tons standard
Armaments:
1x2 12"/50 BL Mark XI Cannons
2x1 3"/50 23cwt QF Mk I Guns
2x1 3"/45 QF HA Mk I AA Guns
4x1 40mm/39 QF Mk II AA Guns
Armour: 51mm over Magazines 25mm Over Machinery Deck and 152mm Belt

Vickers Design 709 for Russia Coastal Monitor Design - 1914
Dimensions: 80,77m wl x 80,77m oa x 14,02m x 2,90m
Speed: 20km/h
Engines: 1.200shp/2-shafts likely Yarrow Boilers (2) Vertical Triple Expansion engines (Yarrow)
Displacement: 1.500tons standard
Armaments:
1x2,1x1 6"/50 Vickers Mk R Guns
Unknown Other Guns
Armour: 25mm deck and 76mm Belt

Vickers Design 718 for Russia Coastal Monitor Design - 1914
Dimensions: 83,82m wl x 83,82m oa x 15,24m x 3,35m
Speed: 21km/h
Engines: 1.500shp/2-shafts likely Yarrow Boilers (2) Vertical Triple Expansion engines (Yarrow)
Displacement: 1.800tons standard
Armaments:
1x2,1x1 8"/50 Vickers Mk X Guns
4x1 6"/13 26cwt BL Mk I Howitzers
4x1 3"/50 23cwt QF Mk I Guns
Armour: 25mm deck and 76mm Belt

Vickers Design 719 for Russia Coastal Monitor Design - 1914
Dimensions: 83,82m wl x 83,82m oa x 15,24m x 3,35m
Speed: 21km/h
Engines: 1.500shp/2-shafts likely Yarrow Boilers (2) Vertical Triple Expansion engines (Yarrow)
Displacement: 1.875tons standard
Armaments:
1x2,1x1 8"/50 Vickers Mk X Guns
4x1 6"/13 26cwt BL Mk I Howitzers
4x1 47mm/50 3pdr Vickers Mk II Guns
Armour: 25mm deck and 76mm Belt

Vickers Design 720 for Russia Coastal Monitor Design - 1914
Dimensions: 83,82m wl x 83,82m oa x 15,24m x 3,35m
Speed: 20km/h
Engines: 1.500shp/2-shafts likely Yarrow Boilers (2) Vertical Triple Expansion engines (Yarrow)
Displacement: 1.925tons standard
Armaments:
2x2 8"/50 Vickers Mk X Guns
4x1 6"/13 26cwt BL Mk I Howitzers
4x1 47mm/50 3pdr Vickers Mk II Guns
Armour: 25mm deck and 76mm Belt

Vickers Design 739 for Russia Coastal Monitor Design - 1914/1915
Dimensions: 100m wl x 25,91m x 2,5m
Speed: 21km/h
Engines: 3.200shp/2-shafts likely Diesel Engines (Vickers)
Displacement: 5.000tons standard
Armaments:
1x3 12"/55 Pattern 1907 Cannons
4x1 130mm/55 Pattern 1913 Guns
4x1 47mm/50 3pdr Vickers Mk II Guns
Armour: 35mm deck and Unknown Belt

Vickers Design 740 for Russia Coastal Monitor Design - 1914/1915
Dimensions: 83,81m wl x 19,91m x 2,36m
Speed: 22km/h
Engines: 2.400shp/2-shafts likely Diesel Engines (Vickers)
Displacement: 2.750tons standard
Armaments:
1x2 12"/15 Pattern 1912 Howitzers
1x2 254mm/50 Pattern 1908 Guns
4x1 130mm/55 Pattern 1913 Guns
Armour: 25mm deck and 100mm Belt

 

[Tzoli]

Those are some odd designs. 11kph? Also, only 5x secondary guns? Total?





Speed is a lot more reasonable here (if only to be able to hold position in and even move against either strong currents or river channels), but I'm still confused by the 5 secondary guns. I'm assuming 4 guns in casemate and 1 on a pedestal?

Do you have any sketches or Shipbucket illustrations?

11km for coastal seems adequate, the WW1 Abercrombie had 13km/h, the Lord Clive 12km/h and the Marshal Ney 11km/h maximum speed.

No the 5 guns were all in casemates with the 5th one on the centreline aft like on contemporary battleships:
USS Texas for example:

 

[Tzoli]

As for drawings only one is presented in Friedman's US Battleship book, and a data table:

And one of the 4 turreted Coastal "Bombardment" Monitor:

 

[Scott Kenny]

Thank you!

 

[Object-911]

Hello i would like to know more about these russian river monitors like the Khasan-class (Project 1190), Udarnyy river monitor (Project SB-12) and any similar projects.

Khasan-class river monitor (Project 1190)

Udarnyy river monitor (Project SB-12)

 

[airman]

Swedish Barsark:
View attachment 807087

Freja battleship coast defense class is new for me : probably military restriction budget had impacted considering also limitations of Treaty of Washington.

 

[Dilandu]

Khasan-class river monitor (Project 1190)

The "Khasan"-class ships were developed for the protection of lower Amur river & Tatar Strait. Initially, something akin to the Swedish coastal defense battleships was envisioned - a warship with one or two large-caliber guns - but such ship was deemed to be too large and suboptimal for river warfare. So the concept was re-worked toward more traditional river monitor, with limited seakeeping ability:



The original design was:
* Displacement 1620 tons
* Draught 2,7 meters
* Speed up to 15 knots
* Limited icebreaking capability
* Armor from 4 mm up to 100 mm
* Four dual turrets with 130-mm guns
* Six dual 45-mm dual-purpose turrets
* Recon seaplane and crane for it


During the designing process, however, the original design was deemed as too heavy, and likely not able to fulfill the draught demands (which was unacceptable, since monitors were supposed to operate on rivers). So the design was re-worked: superfiring "X" main turret was removed and replaced with a pair of dual 76-mm DP turrets, aircraft equipment was eliminated, minelaying rails were added on stern.



The construction, despite being started in 1936, dragged till 1942 (due to Far East shipbuilding industry being relatively newly-established and lacking experience, as well as war disrupting supply chains). Hull sections were made in Sormovo (near Nijny Novgorod) and then railroaded to Khabarovsk for accembly. As completed, monitors were:

* 1920 tons displacement
* 2,9 meters draught
* 15,4 knots max speed
* Armed with six 130-mm guns in three dual turrets (superfiring), with a central director equipped with two 4-meters rangefinders on top of superstructure
* Two dual-purpose 76-mm turrets were installed on the former "X" turret position, with stabilized anti-air director on the rear superstructure
* The light AA armament consisted of two 45-mm dual turrets and four machinegun dual turrets, linked to another anti-air director
* Armor belt was from 37.5 mm to 76 mm, deck from 25 to 40 mm, main turrets protected with 40-100 mm armor



The actual armament of the monitors was somewhat... complicated. The initial project assumed use of B-2-LM turrets, the same as on new destroyers. But those turrets were deemed a bit heavy for monitors, so the new turret B-28 was developed. But B-28 turrets were build in Leningrad only, and when the city was blockaded, the delivery stopped. Only "Khasan" got three B-28 turrets; the "Perekop" was armed temporarely with single-barrel B-13 shield mounts, and "Sivash" got B-2-LM mounts. In 1946, "Perekop" was also re-armed on B-2-LM mounts:



(the Perekop with single shield mounts)

All three ships protected the Amur river estuary, and did not participate in Soviet-Japanese War of 1945 (there are rumors that they were planned to be used to Hokkaido landing - they were supposed to move along Sakhalin coast - but only rumors). By 1950s those monitors were viewed as obsolete and more or less pointless - the Amur river defense was deemed as not important anymore, since China was friendly and Japan was eliminated as threat - so in 1951-1953 they were decommissioned and in 1960s scrapped.