WesWorld

Sentinel, Denmark Coastal Defence Ship / Escort Cruiser, laid down 1934

K.D.M. Sentinel
K.D.M. Guardian
K.D.M. Protector
K.D.M. Defender

Displacement:
9,858 t light; 10,383 t standard; 10,906 t normal; 11,324 t full load

Dimensions: Length overall / water x beam x draught
411.86 ft / 393.00 ft x 90.00 ft (Bulges 100.00 ft) x 17.50 ft (normal load)
125.53 m / 119.79 m x 27.43 m (Bulges 30.48 m) x 5.33 m

Armament:
6 - 11.81" / 300 mm guns (3x2 guns), 823.82lbs / 373.68kg shells, 1934 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 4.72" / 120 mm guns (4x2 guns), 52.72lbs / 23.91kg shells, 1934 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships
20 - 1.46" / 37.0 mm guns (10x2 guns), 1.55lbs / 0.70kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 6 raised mounts
20 - 0.79" / 20.0 mm guns (10x2 guns), 0.24lbs / 0.11kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 5,400 lbs / 2,450 kg
Shells per gun, main battery: 100
4 - 23.6" / 600 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 9.84" / 250 mm 202.76 ft / 61.80 m 11.48 ft / 3.50 m
Ends: Unarmoured
Main Belt covers 79 % of normal length

- Torpedo Bulkhead and Bulges:
1.57" / 40 mm 202.76 ft / 61.80 m 14.76 ft / 4.50 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 9.84" / 250 mm 5.91" / 150 mm 9.84" / 250 mm
2nd: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
3rd: 0.59" / 15 mm 0.59" / 15 mm -
4th: 0.59" / 15 mm 0.59" / 15 mm -

- Armour deck: 2.95" / 75 mm, Conning tower: 7.87" / 200 mm

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 12,600 shp / 9,400 Kw = 18.00 kts
Range 6,000nm at 12.00 kts
Bunker at max displacement = 941 tons

Complement:
533 - 693

Cost:
£4.727 million / $18.907 million

Distribution of weights at normal displacement:
Armament: 675 tons, 6.2 %
Armour: 3,831 tons, 35.1 %
- Belts: 1,127 tons, 10.3 %
- Torpedo bulkhead: 174 tons, 1.6 %
- Armament: 1,091 tons, 10.0 %
- Armour Deck: 1,355 tons, 12.4 %
- Conning Tower: 83 tons, 0.8 %
Machinery: 362 tons, 3.3 %
Hull, fittings & equipment: 4,910 tons, 45.0 %
Fuel, ammunition & stores: 1,048 tons, 9.6 %
Miscellaneous weights: 80 tons, 0.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
19,545 lbs / 8,865 Kg = 23.7 x 11.8 " / 300 mm shells or 5.1 torpedoes
Stability (Unstable if below 1.00): 1.26
Metacentric height 6.5 ft / 2.0 m
Roll period: 16.5 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.23
Seaboat quality (Average = 1.00): 1.26

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.555
Length to Beam Ratio: 3.93 : 1
'Natural speed' for length: 19.82 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.00 ft / 7.32 m
- Forecastle (25 %): 15.00 ft / 4.57 m
- Mid (50 %): 15.00 ft / 4.57 m
- Quarterdeck (18 %): 15.00 ft / 4.57 m
- Stern: 15.00 ft / 4.57 m
- Average freeboard: 15.90 ft / 4.85 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 79.2 %
- Above water (accommodation/working, high = better): 132.9 %
Waterplane Area: 24,800 Square feet or 2,304 Square metres
Displacement factor (Displacement / loading): 109 %
Structure weight / hull surface area: 155 lbs/sq ft or 758 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.12
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily