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Cruiser Ras Dejen

2 x Asmara CDS ships

Submarine Eritrea

About 20 older MAS transferred in 1932 to help with policing duties.

2 Ships, Asmara and Massawa

Asmara, Eritrean Coastal Defence ship laid down 1925

Displacement:
1,911 t light; 2,018 t standard; 2,227 t normal; 2,394 t full load

Dimensions: Length overall / water x beam x draught
241.83 ft / 229.66 ft x 45.93 ft x 11.38 ft (normal load)
73.71 m / 70.00 m x 14.00 m x 3.47 m

Armament:
4 - 8.00" / 203 mm guns (2x2 guns), 276.24lbs / 125.30kg shells, 1925 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1925 Model
Quick firing guns in deck mounts
on side, all amidships
Weight of broadside 1,117 lbs / 507 kg
Shells per gun, main battery: 100
4 - 17.7" / 450 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.76" / 70 mm 108.86 ft / 33.18 m 8.14 ft / 2.48 m
Ends: 0.79" / 20 mm 120.77 ft / 36.81 m 8.14 ft / 2.48 m
Upper: 0.79" / 20 mm 108.86 ft / 33.18 m 8.01 ft / 2.44 m
Main Belt covers 73 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.94" / 100 mm 2.76" / 70 mm 2.76" / 70 mm
3rd: 0.79" / 20 mm - -

- Armour deck: 1.57" / 40 mm, Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 5,800 shp / 4,327 Kw = 18.00 kts
Range 3,000nm at 15.00 kts
Bunker at max displacement = 376 tons

Complement:
161 - 210

Cost:
£0.661 million / $2.645 million

Distribution of weights at normal displacement:
Armament: 130 tons, 5.8 %
Armour: 566 tons, 25.4 %
- Belts: 184 tons, 8.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 136 tons, 6.1 %
- Armour Deck: 235 tons, 10.6 %
- Conning Tower: 10 tons, 0.5 %
Machinery: 188 tons, 8.5 %
Hull, fittings & equipment: 1,002 tons, 45.0 %
Fuel, ammunition & stores: 316 tons, 14.2 %
Miscellaneous weights: 25 tons, 1.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3,982 lbs / 1,806 Kg = 15.6 x 8.0 " / 203 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 2.0 ft / 0.6 m
Roll period: 13.5 seconds
Steadiness - As gun platform (Average = 50 %): 49 %
- Recoil effect (Restricted arc if above 1.00): 0.65
Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.649
Length to Beam Ratio: 5.00 : 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15.42 ft / 4.70 m
- Forecastle (26 %): 13.78 ft / 4.20 m
- Mid (50 %): 13.78 ft / 4.20 m
- Quarterdeck (26 %): 13.78 ft / 4.20 m
- Stern: 13.78 ft / 4.20 m
- Average freeboard: 13.95 ft / 4.25 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 72.9 %
- Above water (accommodation/working, high = better): 107.1 %
Waterplane Area: 8,073 Square feet or 750 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 87 lbs/sq ft or 425 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.87
- Longitudinal: 3.85
- Overall: 1.01
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate

Trade Protection Cruiser "Ras Dejen"

Laid down 1928 in Italy



Ras Dejen, laid down 1928

Displacement:
5,699 t light; 5,922 t standard; 7,101 t normal; 8,045 t full load

Dimensions: Length overall / water x beam x draught
504.36 ft / 492.13 ft x 55.77 ft x 19.69 ft (normal load)
153.73 m / 150.00 m x 17.00 m x 6.00 m

Armament:
5 - 5.98" / 152 mm guns in single mounts, 110.23lbs / 50.00kg shells, 1928 Model
Breech loading guns in deck mounts with hoists
on centreline, evenly spread, 2 raised mounts
4 - 3.94" / 100 mm guns (2x2 guns), 30.42lbs / 13.80kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, all forward
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.83lbs / 0.83kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 687 lbs / 312 kg
Shells per gun, main battery: 200
6 - 21.0" / 533 mm above water torpedoes

Aircraft:
Up to a maximum of 6. Macchi M.18 and Fiat ICR.20

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.76" / 70 mm 364.17 ft / 111.00 m 8.20 ft / 2.50 m
Ends: Unarmoured
Main Belt covers 114 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.98" / 25 mm -
2nd: 0.79" / 20 mm - -

- Armour deck: 0.98" / 25 mm, Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 71,600 shp / 53,414 Kw = 31.75 kts
Range 18,610nm at 12.00 kts
Bunker at max displacement = 2,123 tons

Complement:
386 - 502

Cost:
£2.222 million / $8.887 million

Distribution of weights at normal displacement:
Armament: 84 tons, 1.2 %
Armour: 716 tons, 10.1 %
- Belts: 338 tons, 4.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 34 tons, 0.5 %
- Armour Deck: 321 tons, 4.5 %
- Conning Tower: 22 tons, 0.3 %
Machinery: 2,229 tons, 31.4 %
Hull, fittings & equipment: 2,520 tons, 35.5 %
Fuel, ammunition & stores: 1,402 tons, 19.7 %
Miscellaneous weights: 150 tons, 2.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,860 lbs / 3,111 Kg = 64.0 x 6.0 " / 152 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 2.9 ft / 0.9 m
Roll period: 13.7 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.23
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has rise forward of midbreak
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): 70
Bow angle (Positive = bow angles forward): 20.00 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 %): 13.12 ft / 4.00 m
- Stern: 14.76 ft / 4.50 m
- Average freeboard: 18.43 ft / 5.62 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 113.8 %
- Above water (accommodation/working, high = better): 134.5 %
Waterplane Area: 17,654 Square feet or 1,640 Square metres
Displacement factor (Displacement / loading): 118 %
Structure weight / hull surface area: 87 lbs/sq ft or 425 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.74
- Overall: 1.00
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

Submarine Eritrea Laid down 1934

She is an evolution over the previous Ettore Fieramosca vessel with a small watertight hangar forward of the bridge. On this larger vessel a small catapult is mounted facing towards the bow. This vessel will be the first entirely built and crewed by Ethiopia. It gives Ethiopia some experience in building another type of ship and the large size gives more room for cadets. The hangar can be used a classroom or store space.

Date 1934
Oceanic
Armament 1x 100/35, 2x 25, 4 x AB.2
ElecHP 1200
DieselHP 4000
CREW 49
wt fuel&batts 330
kerb wt 1192
disp 1680
res buoyancy 29%
Max Surf Spd 16.0
Max Sub Spd 7.6

L 70.0
Beam 8.0
D 6.0
Crush depth 225
#TT 8 x 533mm
mines 48
Tons Oil 200
Tons Battery 130

Range 10208@10knts
Underwater range 88@4knts