WesWorld

A possible offensive minelayer for the Kriegsmarine.

Brummer, Germany Minelayer laid down 1937

Displacement:
4,824 t light; 5,007 t standard; 5,521 t normal; 5,933 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(513.48 ft / 498.69 ft) x 52.49 ft x (14.76 / 15.59 ft)
(156.51 m / 152.00 m) x 16.00 m x (4.50 / 4.75 m)

Armament:
8 - 4.13" / 105 mm 65.0 cal guns - 39.16lbs / 17.76kg shells, 360 per gun
Dual purpose guns in deck mounts, 1928 Model
4 x Twin mounts on centreline ends, evenly spread
2 raised mounts - superfiring
12 - 1.46" / 37.0 mm 83.0 cal guns - 1.77lbs / 0.80kg shells, 600 per gun
Anti-aircraft guns in deck mounts, 1929 Model
6 x Twin mounts on sides, evenly spread
6 raised mounts
16 - 0.79" / 20.0 mm 89.0 cal guns - 0.28lbs / 0.13kg shells, 900 per gun
Machine guns in deck mounts, 1928 Model
4 x Twin mounts on sides, evenly spread
4 raised mounts
4 x Twin mounts on side ends, evenly spread
4 double raised mounts
Weight of broadside 339 lbs / 154 kg
Mines
400 - 4,409.25 lbs / 2,000.00 kg mines - 787.365 t total
in Above water - Stern racks/rails

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm -
2nd: 0.79" / 20 mm - -
3rd: 0.39" / 10 mm - -

- Conning towers: Forward 1.97" / 50 mm, Aft 0.00" / 0 mm

Machinery:
Diesel Internal combustion motors, plus diesel motors,
Geared drive, 2 shafts, 37,021 shp / 27,617 Kw = 28.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 926 tons

Complement:
319 - 416

Cost:
£1.844 million / $7.376 million

Distribution of weights at normal displacement:
Armament: 1,066 tons, 19.3 %
- Guns: 82 tons, 1.5 %
- Weapons: 984 tons, 17.8 %
Armour: 56 tons, 1.0 %
- Armament: 43 tons, 0.8 %
- Conning Tower: 13 tons, 0.2 %
Machinery: 1,026 tons, 18.6 %
Hull, fittings & equipment: 1,846 tons, 33.4 %
Fuel, ammunition & stores: 697 tons, 12.6 %
Miscellaneous weights: 830 tons, 15.0 %
- Hull above water: 800 tons
- Above deck: 30 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
8,989 lbs / 4,078 Kg = 254.5 x 4.1 " / 105 mm shells or 1.6 torpedoes
Stability (Unstable if below 1.00): 1.30
Metacentric height 3.1 ft / 0.9 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and a round stern
Block coefficient (normal/deep): 0.500 / 0.509
Length to Beam Ratio: 9.50 : 1
'Natural speed' for length: 22.33 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 8.20 ft / 2.50 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 24.61 ft / 7.50 m, 18.86 ft / 5.75 m
- Forward deck: 30.00 %, 18.86 ft / 5.75 m, 18.86 ft / 5.75 m
- Aft deck: 35.00 %, 11.48 ft / 3.50 m, 11.48 ft / 3.50 m
- Quarter deck: 15.00 %, 11.48 ft / 3.50 m, 11.48 ft / 3.50 m
- Average freeboard: 15.63 ft / 4.77 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 82.0 %
- Above water (accommodation/working, high = better): 155.1 %
Waterplane Area: 17,442 Square feet or 1,620 Square metres
Displacement factor (Displacement / loading): 174 %
Structure weight / hull surface area: 72 lbs/sq ft or 354 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.08
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Carries up to 400 2,000 kg mines in above water, below deck mine rails.

Based on the historical Minenleger planned in1937, see http://www.german-navy.de/kriegsmarine/s…ayer/index.html for historical details.

Note: NOT built to full warship standards.

And here's a ferry conversion to a minelayer.

Tannenberg, Germany Minelayer laid down 1935

Displacement:
4,879 t light; 5,032 t standard; 5,596 t normal; 6,047 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(481.70 ft / 475.72 ft) x 55.77 ft x (14.76 / 15.66 ft)
(146.82 m / 145.00 m) x 17.00 m x (4.50 / 4.77 m)

Armament:
4 - 4.13" / 105 mm 65.0 cal guns - 39.16lbs / 17.76kg shells, 360 per gun
Dual purpose guns in deck mounts, 1937 Model
2 x Twin mounts on centreline ends, evenly spread
2 raised mounts
12 - 1.46" / 37.0 mm 83.0 cal guns - 1.77lbs / 0.80kg shells, 600 per gun
Anti-aircraft guns in deck mounts, 1929 Model
6 x Twin mounts on sides, evenly spread
16 - 0.79" / 20.0 mm 89.0 cal guns - 0.28lbs / 0.13kg shells, 900 per gun
Machine guns in deck mounts, 1928 Model
4 x Twin mounts on sides, evenly spread
4 raised mounts
4 x Twin mounts on side ends, evenly spread
4 double raised mounts
Weight of broadside 182 lbs / 83 kg
Mines
600 - 4,409.25 lbs / 2,000.00 kg mines - 1,181.048 t total
in Above water - Stern racks/rails

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm -
2nd: 0.79" / 20 mm - -
3rd: 0.39" / 10 mm - -

Machinery:
Diesel Internal combustion motors, plus diesel motors,
Geared drive, 2 shafts, 12,680 shp / 9,459 Kw = 21.00 kts
Range 5,500nm at 16.00 kts
Bunker at max displacement = 1,015 tons

Complement:
323 - 420

Cost:
£1.201 million / $4.803 million

Distribution of weights at normal displacement:
Armament: 1,522 tons, 27.2 %
- Guns: 46 tons, 0.8 %
- Weapons: 1,476 tons, 26.4 %
Armour: 33 tons, 0.6 %
- Armament: 33 tons, 0.6 %
Machinery: 360 tons, 6.4 %
Hull, fittings & equipment: 1,734 tons, 31.0 %
Fuel, ammunition & stores: 717 tons, 12.8 %
Miscellaneous weights: 1,230 tons, 22.0 %
- Hull above water: 1,200 tons
- Above deck: 30 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
15,122 lbs / 6,859 Kg = 428.1 x 4.1 " / 105 mm shells or 3.1 torpedoes
Stability (Unstable if below 1.00): 1.43
Metacentric height 3.9 ft / 1.2 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 1.63

Hull form characteristics:
Hull has raised forecastle,
a normal bow and a round stern
Block coefficient (normal/deep): 0.500 / 0.509
Length to Beam Ratio: 8.53 : 1
'Natural speed' for length: 21.81 kts
Power going to wave formation at top speed: 40 %
Trim (Max stability = 0, Max steadiness = 100): 49
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 15.00 %, 24.61 ft / 7.50 m, 22.97 ft / 7.00 m
- Forward deck: 30.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
- Aft deck: 40.00 %, 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: 14.70 ft / 4.48 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 48.4 %
- Above water (accommodation/working, high = better): 136.8 %
Waterplane Area: 17,678 Square feet or 1,642 Square metres
Displacement factor (Displacement / loading): 264 %
Structure weight / hull surface area: 69 lbs/sq ft or 339 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.01
- Longitudinal: 1.02
- Overall: 1.01
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Carries up to 600 2,000 kg mines in above water, below deck mine rails.

Built as a ferry in 1935 and converted.

The German-Navy.de site isn't working for me - none of the pages are, in fact. Anybody else getting this error? Though I remember the two ships you're talking about here.

Well, it was working for me just now.....

Problem is that you pasted the adress twice so the page cannot be found. It reads:
"http://www.german-navy.de/kriegsmarine/ships/minelayer/minelayer/index.htmlhttp://www.german-navy.de/kriegsmarine/ships/minelayer/minelayer/index.html"
It should be "http://www.german-navy.de/kriegsmarine/ships/minelayer/minelayer/index.html"

Quoted

Originally posted by Rooijen10
Problem is that you pasted the adress twice so the page cannot be found. It reads:
"http://www.german-navy.de/kriegsmarine/ships/minelayer/minelayer/index.htmlhttp://www.german-navy.de/kriegsmarine/ships/minelayer/minelayer/index.html"
It should be "http://www.german-navy.de/kriegsmarine/ships/minelayer/minelayer/index.html"

**Amused snort** Yeah, I shoulda seen that... works for me now!

Fixed it in the original.