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Thursday, October 12th 2017, 1:49am

Kriegsmarine Design Plans - 1949

This design represents a logical development of the older Mehrzweckboot and the Seelowe small coastal escorts. It is intended for rapid construction, features greater speed than its predecessors, and has a revised armament. The main gun is of Russian origin, and represents the KM's recognition for greater inter-operability. The secondary gun is a derivative of the 30mm aircraft cannon adapted for naval use.

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Alpenföhn, German Coastal Escort laid down 1949

Displacement: 480 t light; 507 t standard; 592 t normal; 660 t full load

Dimensions: Length overall / water x beam x draught

237.48 ft / 229.66 ft x 24.93 ft x 7.38 ft (normal load) [72.38 m / 70.00 m x 7.60 m x 2.25 m]

Armament:

2 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1949 Model Automatic rapid fire guns in deck mounts with hoists on centerline ends, evenly spread
4 - 1.18" / 30.0 mm guns (2x2 guns), 0.82lbs / 0.37kg shells, 1949 Model Anti-aircraft guns in deck mounts on side, all amidships
Weight of broadside 29 lbs / 13 kg
Shells per gun, main battery: 840

Armor:

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.39" / 10 mm - -

Conning tower: 0.98" / 25 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 6,934 shp / 5,173 Kw = 25.00 kts
Range 4,400nm at 15.00 kts
Bunker at max displacement = 153 tons

Complement: 59 - 77

Cost: £0.335 million / $1.340 million

Distribution of weights at normal displacement:

Armament: 4 tons, 0.7 %
Armor: 5 tons, 0.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.6 %
- Armor Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 168 tons, 28.3 %
Hull, fittings & equipment: 203 tons, 34.3 %
Fuel, ammunition & stores: 112 tons, 18.9 %
Miscellaneous weights: 100 tons, 16.9 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 484 lbs / 219 Kg = 37.6 x 3.0 " / 75 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.1 seconds
Steadiness - As gun platform (Average = 50 %): 63 %
- Recoil effect (Restricted arc if above 1.00): 0.14
Seaboat quality (Average = 1.00): 1.30

Hull form characteristics:

Hull has rise forward of midbreak and transom stern
Block coefficient: 0.490
Length to Beam Ratio: 9.21: 1
'Natural speed' for length: 17.43 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 49
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.03 ft / 5.80 m
- Forecastle (20 %): 18.70 ft / 5.70 m
- Mid (20 %): 18.70 ft / 5.70 m (10.50 ft / 3.20 m aft of break)
- Quarterdeck (40 %): 10.50 ft / 3.20 m
- Stern: 10.50 ft / 3.20 m
- Average freeboard: 12.17 ft / 3.71 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 118.1 %
- Above water (accommodation/working, high = better): 133.2 %
Waterplane Area: 3,931 Square feet or 365 Square meters
Displacement factor (Displacement / loading): 125 %
Structure weight / hull surface area: 26 lbs/sq ft or 125 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.61
- Longitudinal: 3.42
- Overall: 0.73
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

2

Thursday, October 12th 2017, 9:50am

Looks a good design overall. I assume the misc weight covers all kinds of A/S goodies?

3

Thursday, October 12th 2017, 1:03pm

Indeed it does.

Quoted

Breakdown of Miscellaneous Weight

Navigational radar - 15 tons
Search and gun direction radar - 15 tons
Sonar and A/S detection gear - 20 tons
Ahead throwing AS weapon - 20 tons
Depth charge racks and mortars - 20 tons

4

Thursday, October 12th 2017, 3:07pm

Ronneburg class General Purpose Frigate

Planned for construction in the period 1949-50. Marks adoption of steam turbines for use in construction of frigates.

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Ronneburg, German General Purpose Frigate laid down 1949

Displacement: 2,210 t light; 2,363 t standard; 2,594 t normal; 2,778 t full load

Dimensions: Length overall / water x beam x draught

406.26 ft / 393.70 ft x 39.37 ft x 13.78 ft (normal load) [123.83 m / 120.00 m x 12.00 m x 4.20 m]

Armament:

4 - 4.13" / 105 mm guns (2x2 guns), 35.32lbs / 16.02kg shells, 1949 Model Automatic rapid fire guns in deck mounts with hoists on centerline ends, evenly spread
8 - 2.17" / 55.0 mm guns (4x2 guns), 5.08lbs / 2.30kg shells, 1949 Model Anti-aircraft guns in deck mounts on side, evenly spread
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1949 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 183 lbs / 83 kg
Shells per gun, main battery: 900

Armor:

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 0.98" / 25 mm 0.79" / 20 mm -
2nd: 0.59" / 15 mm 0.59" / 15 mm -
3rd: 0.59" / 15 mm - -

Conning tower: 1.57" / 40 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 40,429 shp / 30,160 Kw = 33.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 415 tons

Complement: 181 - 236

Cost: £1.805 million / $7.220 million

Distribution of weights at normal displacement:

Armament: 26 tons, 1.0 %
Armor: 22 tons, 0.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 16 tons, 0.6 %
- Armor Deck: 0 tons, 0.0 %
- Conning Tower: 6 tons, 0.2 %
Machinery: 977 tons, 37.7 %
Hull, fittings & equipment: 1,034 tons, 39.9 %
Fuel, ammunition & stores: 384 tons, 14.8 %
Miscellaneous weights: 150 tons, 5.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,643 lbs / 745 Kg = 46.5 x 4.1 " / 105 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.5 ft / 0.5 m
Roll period: 13.6 seconds
Steadiness - As gun platform (Average = 50 %): 86 %
- Recoil effect (Restricted arc if above 1.00): 0.27
Seaboat quality (Average = 1.00): 1.54

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.425
Length to Beam Ratio: 10.00: 1
'Natural speed' for length: 22.86 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 22.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.97 ft / 7.00 m
- Forecastle (25 %): 22.64 ft / 6.90 m
- Mid (50 %): 18.04 ft / 5.50 m
- Quarterdeck (15 %): 18.04 ft / 5.50 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 19.80 ft / 6.04 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 139.7 %
- Above water (accommodation/working, high = better): 201.3 %
Waterplane Area: 10,069 Square feet or 935 Square meters
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 47 lbs/sq ft or 229 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.63
- Longitudinal: 4.03
- Overall: 0.76
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of miscellaneous weight

Reserved for air warning radar - 20 tons
Reserved for surface search radar - 20 tons
Reserved for fire control radar - 20 tons
Reserved for AS detection equipment - 20 tons
Reserved for AS outfit including DC and K-guns - 10 tons
Reserved for ahead-throwing standoff AS weapon - 20 tons
Reserved for standoff AS weapon midships - 40 tons

5

Thursday, October 12th 2017, 5:18pm

Acheron class Corvette

Acheron, German Corvette laid down 1949

Displacement: 1,370 t light; 1,463 t standard; 1,750 t normal; 1,979 t full load

Dimensions: Length overall / water x beam x draught

329.74 ft / 321.52 ft x 32.48 ft x 11.48 ft (normal load) [100.51 m / 98.00 m x 9.90 m x 3.50 m]

Armament:

2 - 4.13" / 105 mm guns (1x2 guns), 35.32lbs / 16.02kg shells, 1949 Model Automatic rapid fire guns in a deck mount with hoist on centerline forward
4 - 2.17" / 55.0 mm guns (2x2 guns), 5.08lbs / 2.30kg shells, 1949 Model Anti-aircraft guns in deck mounts with hoists on centerline ends, evenly spread, 1 raised mount - superfiring
4 - 2.17" / 55.0 mm guns (2x2 guns), 5.08lbs / 2.30kg shells, 1949 Model Anti-aircraft guns in deck mounts on side, all amidships
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1949 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 112 lbs / 51 kg
Shells per gun, main battery: 800

Armor:

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -

Conning tower: 0.79" / 20 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 18,741 shp / 13,981 Kw = 28.00 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 516 tons

Complement: 134 - 175

Cost: £0.952 million / $3.806 million

Distribution of weights at normal displacement:

Armament: 16 tons, 0.9 %
Armor: 8 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 0.3 %
- Armor Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.1 %
Machinery: 453 tons, 25.9 %
Hull, fittings & equipment: 743 tons, 42.5 %
Fuel, ammunition & stores: 380 tons, 21.7 %
Miscellaneous weights: 150 tons, 8.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,413 lbs / 1,095 Kg = 68.3 x 4.1 " / 105 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.1 ft / 0.3 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 65 %
- Recoil effect (Restricted arc if above 1.00): 0.25
Seaboat quality (Average = 1.00): 1.28

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.511
Length to Beam Ratio: 9.90: 1
'Natural speed' for length: 20.45 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 22.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.34 ft / 6.20 m
- Forecastle (20 %): 18.37 ft / 5.60 m
- Mid (40 %): 16.40 ft / 5.00 m
- Quarterdeck (25 %): 11.81 ft / 3.60 m
- Stern: 11.81 ft / 3.60 m
- Average freeboard: 15.20 ft / 4.63 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 103.5 %
- Above water (accommodation/working, high = better): 159.0 %
Waterplane Area: 7,309 Square feet or 679 Square meters
Displacement factor (Displacement / loading): 147 %
Structure weight / hull surface area: 51 lbs/sq ft or 249 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.86
- Longitudinal: 3.68
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weight

Reserved for air and surface warning radar - 20 tons
Reserved for fire control and director radar - 20 tons
Reserved for sonar - 30 tons
Reserved for stand-off antisubmarine weapon - 40 tons
Reserved for A/S outfit - two depth charge racks, 48 depth charges - 20 tons
Tropicalization - 20 tons

6

Thursday, October 12th 2017, 6:43pm

Stollergrund class Aviation Repair Ship

Stollergrund, German Aviation Repair Ship laid down 1949

Displacement: 10,614 t light; 10,943 t standard; 15,712 t normal; 19,527 t full load

Dimensions: Length overall / water x beam x draught

475.82 ft / 465.22 ft x 69.55 ft x 24.28 ft (normal load) [145.03 m / 141.80 m x 21.20 m x 7.40 m]

Armament:

4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1944 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1944 Model Anti-aircraft guns in deck mounts on side, evenly spread
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1944 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 20 lbs / 9 kg
Shells per gun, main battery: 900

Machinery:

Diesel Internal combustion motors, Geared drive, 1 shaft, 10,346 shp / 7,718 Kw = 16.50 kts
Range 40,000nm at 14.00 kts
Bunker at max displacement = 8,585 tons

Complement: 701 - 912

Cost: £3.120 million / $12.479 million

Distribution of weights at normal displacement:

Armament: 2 tons, 0.0 %
Machinery: 250 tons, 1.6 %
Hull, fittings & equipment: 5,861 tons, 37.3 %
Fuel, ammunition & stores: 5,098 tons, 32.4 %
Miscellaneous weights: 4,500 tons, 28.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 37,692 lbs / 17,097 Kg = 24,387.9 x 1.5 " / 37 mm shells or 5.5 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 3.8 ft / 1.2 m
Roll period: 15.0 seconds
Steadiness - As gun platform (Average = 50 %): 69 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.86

Hull form characteristics:

Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.700
Length to Beam Ratio: 6.69: 1
'Natural speed' for length: 21.57 kts
Power going to wave formation at top speed: 39 %
Trim (Max stability = 0, Max steadiness = 100): 37
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (25 %): 21.33 ft / 6.50 m (14.76 ft / 4.50 m aft of break)
- Mid (50 %): 14.76 ft / 4.50 m
- Quarterdeck (15 %): 21.33 ft / 6.50 m (14.76 ft / 4.50 m before break)
- Stern: 22.31 ft / 6.80 m
- Average freeboard: 17.79 ft / 5.42 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 37.9 %
- Above water (accommodation/working, high = better): 103.3 %
Waterplane Area: 25,762 Square feet or 2,393 Square metres
Displacement factor (Displacement / loading): 313 %
Structure weight / hull surface area: 156 lbs/sq ft or 762 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.78
- Longitudinal: 2.59
- Overall: 1.85
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Actual radius 12,000 nm on BAM of 2,674 tons (Bunkers per engines tab 1,486 tons). Low stowed cargo (3,000 tons) simmed as additional bunkers

Breakdown of miscellaneous weight

Provision for navigational radar - 25 tons
Provision for air search radar - 25 tons
Provision for communication suite - 25 tons
Accommodation spaces for repair and service crews - 900 tons
Handling gear for cargo transfer - 225 tons
Aircraft engine repair shops - 750 tons
Aircraft airframe repair shops - 750 tons
Aircraft instrument repair shops - 500 tons
Aircraft ordnance repair shops - 500 tons
Crated aircraft - 32 aircraft @ 25 tons - 800 tons

Low-stowed cargo spaces (3,000 tons) used for spare parts and equipment.

Projected cost: 2,654 tons (25% of 10,614 tons light displacement)
Projected construction time: 589 days (19.61 months)

Vessels are constructed to mercantile standards.

7

Thursday, October 12th 2017, 7:02pm

Kamerun class Heavy Hull Repair Ship

Kamerun, German Heavy Hull Repair Ship laid down 1949

Displacement: 10,614 t light; 10,943 t standard; 15,712 t normal; 19,527 t full load

Dimensions: Length overall / water x beam x draught

475.82 ft / 465.22 ft x 69.55 ft x 24.28 ft (normal load) [145.03 m / 141.80 m x 21.20 m x 7.40 m]

Armament:

4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1944 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1944 Model Anti-aircraft guns in deck mounts on side, evenly spread
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1944 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 20 lbs / 9 kg
Shells per gun, main battery: 900

Machinery:

Diesel Internal combustion motors, Geared drive, 1 shaft, 10,346 shp / 7,718 Kw = 16.50 kts
Range 40,000nm at 14.00 kts
Bunker at max displacement = 8,585 tons

Complement: 701 - 912

Cost: £3.120 million / $12.479 million

Distribution of weights at normal displacement:

Armament: 2 tons, 0.0 %
Machinery: 250 tons, 1.6 %
Hull, fittings & equipment: 5,861 tons, 37.3 %
Fuel, ammunition & stores: 5,098 tons, 32.4 %
Miscellaneous weights: 4,500 tons, 28.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 37,692 lbs / 17,097 Kg = 24,387.9 x 1.5 " / 37 mm shells or 5.5 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 3.8 ft / 1.2 m
Roll period: 15.0 seconds
Steadiness - As gun platform (Average = 50 %): 69 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.86

Hull form characteristics:

Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.700
Length to Beam Ratio: 6.69: 1
'Natural speed' for length: 21.57 kts
Power going to wave formation at top speed: 39 %
Trim (Max stability = 0, Max steadiness = 100): 37
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (25 %): 21.33 ft / 6.50 m (14.76 ft / 4.50 m aft of break)
- Mid (50 %): 14.76 ft / 4.50 m
- Quarterdeck (15 %): 21.33 ft / 6.50 m (14.76 ft / 4.50 m before break)
- Stern: 22.31 ft / 6.80 m
- Average freeboard: 17.79 ft / 5.42 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 37.9 %
- Above water (accommodation/working, high = better): 103.3 %
Waterplane Area: 25,762 Square feet or 2,393 Square metres
Displacement factor (Displacement / loading): 313 %
Structure weight / hull surface area: 156 lbs/sq ft or 762 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.78
- Longitudinal: 2.59
- Overall: 1.85
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Actual radius 12,000 nm on BAM of 2,674 tons (Bunkers per engines tab 1,486 tons). Low stowed cargo (3,000 tons) simmed as additional bunkers

Provision for navigational radar - 25 tons
Provision for air search radar - 25 tons
Provision for communication suite - 25 tons
Accommodation spaces for repair and service crews - 800 tons
Cranes and handling gear - 425 tons
Hull component repair workshops- 800 tons
Machinery component repair workshops - 800 tons
Ordnance component repair shops - 800 tons
Welding and fabrication shops- 800 tons

Low-stowed cargo spaces (3,000 tons) used for spare parts, materials, and equipment.

Equipped to carry out heavy hull repairs, first level repairs on ships' armament up to 15cm, and repair heavy machinery parts and ordnance parts, except guns. Has enhanced welding and salvage capabilities. Fitted with 30 ton booms

Projected cost: 2,654 tons (25% of 10,614 tons light displacement)
Projected construction time: 589 days (19.61 months)

Vessels are constructed to mercantile standards.