WesWorld

The Brummer (Düsseldorf) class Artillery Training Ships (Training Cruisers) were simmed by my predecessor in SS3. To conform to our conventions, I have resimmed the vessels to SS2.1, doing so to the best I can within the limitations of the software. I invite your comments on the proposed resim.

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Original Sim


Düsseldorf, German Training Cruiser laid down 1939

Displacement: 4,803 t light; 5,113 t standard; 5,547 t normal; 5,895 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)

541.47 ft / 524.93 ft x 54.13 ft x 13.94 / 14.58 ft [165.04 m / 160.00 m x 16.50 m x 4.25 / 4.44 m]

Armament:

9 - 5.91" / 150 mm 60.0 cal guns - 100.31lbs / 45.50kg shells, 180 per gun Breech loading guns in turret on barbette mounts, 1928 Model 3 x Triple mounts on centreline ends, majority forward, 1 raised mount - superfiring
10 - 4.13" / 105 mm 65.0 cal guns - 39.16lbs / 17.76kg shells, 400 per gun Dual purpose guns in deck mounts, 1929 Model, 4 x Twin mounts on sides, evenly spread, 1 x Twin mount on centreline aft, 1 raised mount
16 - 1.46" / 37.0 mm 63.0 cal guns - 1.71lbs / 0.77kg shells, 1,000 per gun, Anti-air guns in deck mounts, 1928 Model, 8 x Twin mounts on sides, evenly spread, 4 raised mounts
20 - 0.79" / 20.0 mm 83.0 cal guns - 0.28lbs / 0.13kg shells, 2,000 per gun, Machine guns in deck mounts, 1929 Model 8 x Twin mounts on sides, evenly spread, 8 raised mounts, 2 x Twin mounts on centreline ends, evenly spread, 2 double raised mounts
Weight of broadside 1,327 lbs / 602 kg

Main Torpedoes

8 - 21.0" / 533 mm, 22.97 ft / 7.00 m torpedoes - 1.548 t each, 12.386 t total, In 2 sets of deck mounted side rotating tubes

Mines

60 - 2,204.62 lbs / 1,000.00 kg mines - 59.052 t total, in Above water - Stern racks/rails

Armour:

Belts: Width (max) Length (avg) Height (avg)
Main: 3.94" / 100 mm 319.88 ft / 97.50 m 8.83 ft / 2.69 m
Ends: Unarmoured
Main Belt covers 94 % of normal length

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.72" / 120 mm 2.76" / 70 mm 4.72" / 120 mm
2nd: 1.18" / 30 mm 0.79" / 20 mm -
3rd: 0.79" / 20 mm 0.39" / 10 mm -
4th: 0.39" / 10 mm - -

Armoured deck - multiple decks: Forw and Aft decks: 1.57" / 40 mm

Conning towers: Forward 4.72" / 120 mm, Aft 0.00" / 0 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 29,406 shp / 21,937 Kw = 27.00 kts
Range 8,000nm at 12.00 kts
Bunker at max displacement = 782 tons

Complement: 320 - 417

Cost: £2.480 million / $9.918 million

Distribution of weights at normal displacement:
Armament: 508 tons, 9.2 %
- Guns: 410 tons, 7.4 %
- Weapons: 99 tons, 1.8 %
Armour: 1,249 tons, 22.5 %
- Belts: 463 tons, 8.3 %
- Armament: 295 tons, 5.3 %
- Armour Deck: 459 tons, 8.3 %
- Conning Tower: 32 tons, 0.6 %
Machinery: 805 tons, 14.5 %
Hull, fittings & equipment: 2,011 tons, 36.2 %
Fuel, ammunition & stores: 744 tons, 13.4 %
Miscellaneous weights: 230 tons, 4.1 %
- On freeboard deck: 200 tons
- Above deck: 30 tons

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):
8,369 lbs / 3,796 Kg = 81.3 x 5.9 " / 150 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 2.6 ft / 0.8 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 57 %
- Recoil effect (Restricted arc if above 1.00): 0.39
Seaboat quality (Average = 1.00): 1.14

Hull form characteristics:

Hull has a flush deck, a normal bow and small transom stern
Block coefficient (normal/deep): 0.490 / 0.498
Length to Beam Ratio: 9.70: 1
'Natural speed' for length: 24.63 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 22.97 ft / 7.00 m, 16.40 ft / 5.00 m
- Forward deck: 30.00 %, 16.40 ft / 5.00 m, 13.12 ft / 4.00 m
- Aft deck: 35.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
- Quarter deck: 15.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
- Average freeboard: 14.80 ft / 4.51 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 75.5 %
- Above water (accommodation/working, high = better): 154.0 %
Waterplane Area: 19,210 Square feet or 1,785 Square metres
Displacement factor (Displacement / loading): 120 %
Structure weight / hull surface area: 82 lbs/sq ft or 399 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 0.90
- Overall: 0.90
Caution: Hull subject to strain in open-sea
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room

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Proposed Resim

Brummer, German Artillery School Ship laid down 1939

Displacement: 4,803 t light; 5,060 t standard; 5,547 t normal; 5,937 t full load

Dimensions: Length overall / water x beam x draught

541.47 ft / 524.93 ft x 54.13 ft x 13.94 ft (normal load) [165.04 m / 160.00 m x 16.50 m x 4.25 m]

Armament:

9 - 5.91" / 150 mm guns (3x3 guns), 102.98lbs / 46.71kg shells, 1928 Model Breech loading guns in turrets (on barbettes) on centreline ends, majority forward, 1 raised mount - superfiring
2 - 4.13" / 105 mm guns (1x2 guns), 39.15lbs / 17.76kg shells, 1929 Model Dual purpose guns in deck mount on centreline aft, all raised guns - superfiring
8 - 4.13" / 105 mm guns (4x2 guns), 39.15lbs / 17.76kg shells, 1929 Model Dual purpose guns in deck mounts on side, evenly spread
16 - 1.46" / 37.0 mm guns (8x2 guns), 1.55lbs / 0.70kg shells, 1928 Model Anti-aircraft guns in deck mounts on side, evenly spread, 4 raised mounts
20 - 0.79" / 20.0 mm guns (10x2 guns), 0.24lbs / 0.11kg shells, 1928 Model Anti-aircraft guns in deck mounts on side, evenly spread, 2 raised mounts
Weight of broadside 1,348 lbs / 611 kg
Shells per gun, main battery: 180
8 - 21.0" / 533 mm above water torpedoes

Armour:

Belts: Width (max) Length (avg) Height (avg)
Main: 3.94" / 100 mm 319.88 ft / 97.50 m 8.83 ft / 2.69 m
Ends: Unarmoured
Main Belt covers 94 % of normal length

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.72" / 120 mm 2.76" / 70 mm 4.72" / 120 mm
2nd: 1.18" / 30 mm 0.79" / 20 mm -
3rd: 1.18" / 30 mm 0.79" / 20 mm -
4th: 0.79" / 20 mm 0.39" / 10 mm -
5th: 0.39" / 10 mm - -

Armour deck: 1.57" / 40 mm, Conning tower: 4.72" / 120 mm

Machinery: Oil fired boilers, steam turbines, Geared drive, 2 shafts, 27,825 shp / 20,757 Kw = 27.00 kts
Range 9,675nm at 12.00 kts
Bunker at max displacement = 876 tons

Complement: 320 - 417

Cost: £2.391 million / $9.565 million

Distribution of weights at normal displacement:

Armament: 164 tons, 3.0 %
Armour: 1,368 tons, 24.7 %
- Belts: 468 tons, 8.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 300 tons, 5.4 %
- Armour Deck: 568 tons, 10.2 %
- Conning Tower: 32 tons, 0.6 %
Machinery: 753 tons, 13.6 %
Hull, fittings & equipment: 2,288 tons, 41.2 %
Fuel, ammunition & stores: 744 tons, 13.4 %
Miscellaneous weights: 230 tons, 4.1 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 9,284 lbs / 4,211 Kg = 90.2 x 5.9 " / 150 mm shells or 1.9 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 2.8 ft / 0.9 m
Roll period: 13.5 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.36
Seaboat quality (Average = 1.00): 1.16

Hull form characteristics:

Hull has rise forward of midbreak and transom stern
Block coefficient: 0.490
Length to Beam Ratio: 9.70: 1
'Natural speed' for length: 26.24 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30.00 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 (20 %): 17.13 ft / 5.22 m
- Mid (30 %): 17.13 ft / 5.22 m (13.12 ft / 4.00 m aft of break)
- Quarterdeck (15 %): 13.12 ft / 4.00 m
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 14.79 ft / 4.51 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 72.8 %
- Above water (accommodation/working, high = better): 128.6 %
Waterplane Area: 19,508 Square feet or 1,812 Square metres
Displacement factor (Displacement / loading): 126 %
Structure weight / hull surface area: 83 lbs/sq ft or 407 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 0.94
- Overall: 0.93
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent

Looks acceptable to me. The only things that are really different are the range, but I presume that is an artifact of the conversion necessary to get the light weight down to the same value, and the shell weights. Does Germany have standardized shell weights?

Quoted

Originally posted by Sachmle
Looks acceptable to me. The only things that are really different are the range, but I presume that is an artifact of the conversion necessary to get the light weight down to the same value, and the shell weights. Does Germany have standardized shell weights?

I went with the shell weights specified in the SS3 sim, which are not the default values from SS2. And you are correct - the range was extended to bring the light displacement values into line and narrow the spread between the strength values.

Given the feedback, I am going to presume that the effort to resim the Brummer and Bremse to conform to SS 2.1 is acceptable, and I will update my encyclopedia accordingly. Thank you for your comments.

Quoted

Originally posted by BruceDuncan
Given the feedback, I am going to presume that the effort to resim the Brummer and Bremse to conform to SS 2.1 is acceptable, and I will update my encyclopedia accordingly.

Thumbs up from me.