A possible reconstruction of the current flagship of the EAN, the Ras Dejen.
Ras Dejen, East African Cruiser laid down 1928 (Engine 1945)
Displacement:
5,270 t light; 5,651 t standard; 7,101 t normal; 8,261 t full load
Dimensions: Length overall / water x beam x draught
505.25 ft / 492.13 ft x 55.77 ft x 19.69 ft (normal load)
154.00 m / 150.00 m x 17.00 m x 6.00 m
Armament:
5 - 5.98" / 152 mm guns in single mounts, 99.21lbs / 45.00kg shells, 1945 Model
Dual purpose guns in deck mounts with hoists
on centreline, evenly spread, 2 raised mounts
8 - 2.99" / 76.0 mm guns (4x2 guns), 13.39lbs / 6.08kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all amidships
24 - 1.46" / 37.0 mm guns (12x2 guns), 1.55lbs / 0.70kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
16 - 0.98" / 25.0 mm guns (8x2 guns), 0.48lbs / 0.22kg shells, 1928 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 648 lbs / 294 kg
Shells per gun, main battery: 600
8 - 23.6" / 600 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.76" / 70 mm 319.88 ft / 97.50 m 8.20 ft / 2.50 m
Ends: Unarmoured
Main Belt covers 100 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 1.18" / 30 mm 0.79" / 20 mm
2nd: 1.18" / 30 mm 0.79" / 20 mm 0.79" / 20 mm
3rd: 0.39" / 10 mm 0.39" / 10 mm -
4th: 0.39" / 10 mm - -
- Armour deck: 0.98" / 25 mm, Conning tower: 2.76" / 70 mm
Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Electric motors, 2 shafts, 71,600 shp / 53,414 Kw = 31.75 kts
Range 8,030nm at 20.00 kts
Bunker at max displacement = 2,610 tons
Complement:
386 - 502
Cost:
£1.955 million / $7.820 million
Distribution of weights at normal displacement:
Armament: 89 tons, 1.2 %
Armour: 707 tons, 10.0 %
- Belts: 304 tons, 4.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 60 tons, 0.8 %
- Armour Deck: 321 tons, 4.5 %
- Conning Tower: 22 tons, 0.3 %
Machinery: 1,808 tons, 25.5 %
Hull, fittings & equipment: 2,527 tons, 35.6 %
Fuel, ammunition & stores: 1,831 tons, 25.8 %
Miscellaneous weights: 140 tons, 2.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
9,079 lbs / 4,118 Kg = 84.7 x 6.0 " / 152 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 2.9 ft / 0.9 m
Roll period: 13.8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.22
Seaboat quality (Average = 1.00): 1.02
Hull form characteristics:
Hull has rise forward of midbreak, raised quarterdeck
Block coefficient: 0.460
Length to Beam Ratio: 8.82 : 1
'Natural speed' for length: 22.18 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 21.80 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (20 %): 21.33 ft / 6.50 m
- Mid (60 %): 21.33 ft / 6.50 m (13.12 ft / 4.00 m aft of break)
- Quarterdeck (15 %): 14.76 ft / 4.50 m (13.12 ft / 4.00 m before break)
- Stern: 14.76 ft / 4.50 m
- Average freeboard: 18.55 ft / 5.66 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 97.6 %
- Above water (accommodation/working, high = better): 118.1 %
Waterplane Area: 17,654 Square feet or 1,640 Square metres
Displacement factor (Displacement / loading): 137 %
Structure weight / hull surface area: 87 lbs/sq ft or 425 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.75
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform