Txapelduna-class Armoured Cruiser (1902)

Txapelduna-class, Syrellian Armoured Cruiser laid down 1903

Displacement:
 8,980 t light; 9,367 t standard; 10,344 t normal; 11,125 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (423.23 ft / 416.67 ft) x 64.63 ft x (24.44 / 25.90 ft)
 (129.00 m / 127.00 m) x 19.70 m x (7.45 / 7.89 m)

Armament:

```
     4 - 8.07" / 205 mm 47.0 cal guns - 273.44lbs / 124.03kg shells, 110 per gun

```

 Breech loading guns in turret on barbette mounts, 1901 Model
 2 x 2-gun mounts on centreline ends, evenly spread

```
     8 - 5.91" / 150 mm 45.0 cal guns - 103.86lbs / 47.11kg shells, 200 per gun

```

 Breech loading guns in turret on barbette mounts, 1901 Model
 4 x 2-gun mounts on sides, evenly spread

```
     10 - 2.95" / 75.0 mm 50.0 cal guns - 13.12lbs / 5.95kg shells, 300 per gun

```

 Quick firing guns in casemate mounts, 1885 Model
 10 x Single mounts on sides, evenly spread
 10 hull mounts in casemates- Limited use in all but light seas

```
     Weight of broadside 2,056 lbs / 932 kg
     Main Torpedoes
     4 - 17.7" / 450 mm, 13.12 ft / 4.00 m torpedoes - 0.528 t each, 2.113 t total

```

 In 4 sets of deck mounted carriage/fixed tubes

Armour:

```
  - Belts:		Width (max)	Length (avg)		Height (avg)

```

 Main: 5.91" / 150 mm 328.08 ft / 100.00 m 9.84 ft / 3.00 m
 Ends: 3.94" / 100 mm 82.02 ft / 25.00 m 9.84 ft / 3.00 m
 6.56 ft / 2.00 m Unarmoured ends
 Upper: 3.15" / 80 mm 328.08 ft / 100.00 m 6.23 ft / 1.90 m
 Main Belt covers 121 % of normal length

```
  - Torpedo Bulkhead - Additional damage containing bulkheads:

```

 1.57" / 40 mm 328.08 ft / 100.00 m 22.44 ft / 6.84 m
 Beam between torpedo bulkheads 51.51 ft / 15.70 m

```
  - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)

```

 Main: 8.66" / 220 mm 5.12" / 130 mm 6.30" / 160 mm
 2nd: 3.15" / 80 mm 1.57" / 40 mm 3.15" / 80 mm
 3rd: 1.18" / 30 mm - -

```
  - Armoured deck - multiple decks:

```

 For and Aft decks: 3.15" / 80 mm
 Forecastle: 1.57" / 40 mm Quarter deck: 1.57" / 40 mm

```
  - Conning towers: Forward 9.06" / 230 mm, Aft 0.00" / 0 mm

```

Machinery:
 Coal fired boilers, complex reciprocating steam engines,
 Direct drive, 3 shafts, 16,337 ihp / 12,188 Kw = 20.00 kts
 Range 4,850nm at 12.00 kts
 Bunker at max displacement = 1,757 tons (100% coal)

Complement:
 512 - 666

Cost:
 £0.849 million / $3.395 million

Distribution of weights at normal displacement:
 Armament: 588 tons, 5.7 %
 - Guns: 585 tons, 5.7 %
 - Weapons: 3 tons, 0.0 %
 Armour: 3,147 tons, 30.4 %
 - Belts: 1,174 tons, 11.4 %
 - Torpedo bulkhead: 429 tons, 4.1 %
 - Armament: 450 tons, 4.3 %
 - Armour Deck: 1,001 tons, 9.7 %
 - Conning Tower: 93 tons, 0.9 %
 Machinery: 2,438 tons, 23.6 %
 Hull, fittings & equipment: 2,657 tons, 25.7 %
 Fuel, ammunition & stores: 1,364 tons, 13.2 %
 Miscellaneous weights: 150 tons, 1.5 %
 - Hull below water: 35 tons
 - Hull above water: 50 tons
 - On freeboard deck: 50 tons
 - Above deck: 15 tons

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
 11,632 lbs / 5,276 Kg = 44.3 x 8.1 " / 205 mm shells or 5.0 torpedoes
 Stability (Unstable if below 1.00): 1.32
 Metacentric height 4.3 ft / 1.3 m
 Roll period: 13.2 seconds
 Steadiness - As gun platform (Average = 50 %): 81 %
 - Recoil effect (Restricted arc if above 1.00): 0.34
 Seaboat quality (Average = 1.00): 1.63

Hull form characteristics:
 Hull has rise forward of midbreak,
 a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.550 / 0.558
 Length to Beam Ratio: 6.45 : 1
 'Natural speed' for length: 20.41 kts
 Power going to wave formation at top speed: 49 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 15.00 degrees
 Stern overhang: -6.56 ft / -2.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
 Fore end, Aft end
 - Forecastle: 20.00 %, 22.97 ft / 7.00 m, 19.69 ft / 6.00 m
 - Forward deck: 45.00 %, 19.69 ft / 6.00 m, 19.69 ft / 6.00 m
 - Aft deck: 20.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
 - Quarter deck: 15.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
 - Average freeboard: 16.50 ft / 5.03 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 119.5 %
 - Above water (accommodation/working, high = better): 116.0 %
 Waterplane Area: 18,794 Square feet or 1,746 Square metres
 Displacement factor (Displacement / loading): 103 %
 Structure weight / hull surface area: 104 lbs/sq ft or 509 Kg/sq metre
 Hull strength (Relative):
 - Cross-sectional: 0.93
 - Longitudinal: 2.02
 - Overall: 1.01
 Cramped machinery, storage, compartmentation space
 Adequate 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