Yugoslav Monitors

Ambitious Packrat

Sunday, May 3rd 2009, 3:20am

A monitor for Yugoslavia, designed to fit in a Type 0 slip.

Thoughts?

Zagreb, Yugoslavia Monitor laid down 1937

Displacement:
1,000 t light; 1,049 t standard; 1,100 t normal; 1,141 t full load

Dimensions: Length overall / water x beam x draught
220.00 ft / 220.00 ft x 35.00 ft x 10.00 ft (normal load)
67.06 m / 67.06 m x 10.67 m x 3.05 m

Armament:
2 - 7.87" / 200 mm guns (1x2 guns), 243.72lbs / 110.55kg shells, 1937 Model
Breech loading guns in a turret (on a barbette)
on centreline forward
2 - 4.33" / 110 mm guns (1x2 guns), 40.59lbs / 18.41kg shells, 1937 Model
Dual purpose guns in a deck mount with hoist
on centreline aft
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.89kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 586 lbs / 266 kg
Shells per gun, main battery: 80

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.33" / 110 mm 100.00 ft / 30.48 m 7.00 ft / 2.13 m
Ends: Unarmoured
Main Belt covers 70 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.33" / 110 mm 2.95" / 75 mm 4.33" / 110 mm

- Armour deck: 1.18" / 30 mm, Conning tower: 4.33" / 110 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 1,649 shp / 1,230 Kw = 15.00 kts
Range 1,300nm at 15.00 kts
Bunker at max displacement = 92 tons

Complement:
95 - 124

Cost:
£0.561 million / $2.246 million

Distribution of weights at normal displacement:
Armament: 73 tons, 6.7 %
Armour: 329 tons, 29.9 %
- Belts: 145 tons, 13.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 63 tons, 5.7 %
- Armour Deck: 112 tons, 10.2 %
- Conning Tower: 10 tons, 0.9 %
Machinery: 46 tons, 4.2 %
Hull, fittings & equipment: 512 tons, 46.5 %
Fuel, ammunition & stores: 100 tons, 9.1 %
Miscellaneous weights: 40 tons, 3.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,630 lbs / 739 Kg = 6.7 x 7.9 " / 200 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 1.2 ft / 0.4 m
Roll period: 13.5 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.63
Seaboat quality (Average = 1.00): 1.24

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.500
Length to Beam Ratio: 6.29 : 1
'Natural speed' for length: 14.83 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 57
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 10.00 ft / 3.05 m
- Forecastle (20 %): 7.00 ft / 2.13 m
- Mid (50 %): 7.00 ft / 2.13 m
- Quarterdeck (15 %): 7.00 ft / 2.13 m
- Stern: 7.00 ft / 2.13 m
- Average freeboard: 7.24 ft / 2.21 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 67.3 %
- Above water (accommodation/working, high = better): 72.0 %
Waterplane Area: 5,130 Square feet or 477 Square metres
Displacement factor (Displacement / loading): 105 %
Structure weight / hull surface area: 72 lbs/sq ft or 352 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.15
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

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Desertfox

Ambitious Packrat

Posts: 4,058

2

Sunday, May 3rd 2009, 3:23am

A smaller design:

Yugoslavia Monitor laid down 1937

Displacement:
400 t light; 427 t standard; 447 t normal; 463 t full load

Dimensions: Length overall / water x beam x draught
200.00 ft / 200.00 ft x 26.00 ft x 7.00 ft (normal load)
60.96 m / 60.96 m x 7.92 m x 2.13 m

Armament:
2 - 5.31" / 135 mm guns (1x2 guns), 74.86lbs / 33.96kg shells, 1937 Model
Breech loading guns in a deck mount with hoist
on centreline forward
2 - 2.76" / 70.0 mm guns (1x2 guns), 10.47lbs / 4.75kg shells, 1937 Model
Dual purpose guns in deck mount
on centreline aft
6 - 1.57" / 40.0 mm guns (3x2 guns), 1.95lbs / 0.89kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all amidships, 1 raised mount - superfiring
Weight of broadside 182 lbs / 83 kg
Shells per gun, main battery: 170

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.95" / 75 mm 85.00 ft / 25.91 m 5.00 ft / 1.52 m
Ends: Unarmoured
Main Belt covers 65 % of normal length
Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.95" / 75 mm 0.79" / 20 mm 0.79" / 20 mm

- Armour deck: 0.79" / 20 mm, Conning tower: 2.95" / 75 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 938 shp / 699 Kw = 15.00 kts
Range 2,500nm at 10.00 kts
Bunker at max displacement = 36 tons

Complement:
48 - 63

Cost:
£0.201 million / $0.802 million

Distribution of weights at normal displacement:
Armament: 23 tons, 5.1 %
Armour: 121 tons, 27.0 %
- Belts: 58 tons, 13.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 11 tons, 2.4 %
- Armour Deck: 48 tons, 10.7 %
- Conning Tower: 4 tons, 0.8 %
Machinery: 26 tons, 5.8 %
Hull, fittings & equipment: 206 tons, 46.1 %
Fuel, ammunition & stores: 48 tons, 10.6 %
Miscellaneous weights: 24 tons, 5.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
729 lbs / 331 Kg = 9.7 x 5.3 " / 135 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.8 ft / 0.2 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.42
Seaboat quality (Average = 1.00): 1.07

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.430
Length to Beam Ratio: 7.69 : 1
'Natural speed' for length: 14.14 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 66
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 7.00 ft / 2.13 m
- Forecastle (30 %): 5.00 ft / 1.52 m
- Mid (50 %): 5.00 ft / 1.52 m
- Quarterdeck (15 %): 5.00 ft / 1.52 m
- Stern: 5.00 ft / 1.52 m
- Average freeboard: 5.24 ft / 1.60 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 65.5 %
- Above water (accommodation/working, high = better): 64.8 %
Waterplane Area: 3,265 Square feet or 303 Square metres
Displacement factor (Displacement / loading): 118 %
Structure weight / hull surface area: 46 lbs/sq ft or 226 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.37
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform

This post has been edited 1 times, last edit by "Desertfox" (May 3rd 2009, 3:23am)