Propozycja
opancerzonego krążownika kolonialnego dla Holandii, przeznaczonego do
służby w Holenderskich Indiach Wschodnich. Projekt ten ostatecznie nie
doczekał się realizacji - zbudowany krążownik Sumatra powstał według
zupełnie innych planów..
źródło: Okręty Wojenne nr 30.
Alkmaar, dutch armoured cruiser laid down 1884 (Engine 1885)
Armoured Corvette (Broadside ironclad)
Displacement:
2 878 t light; 3 089 t standard; 3 311 t normal; 3 489 t full load
Dimensions: Length overall / water x beam x draught
236,22 ft / 233,27 ft x 47,57 ft x 13,62 ft (normal load)
72,00 m / 71,10 m x 14,50 m x 4,15 m
Armament:
4 - 6,69" / 170 mm guns in single mounts, 136,41lbs / 61,87kg shells, 1884 Model
Breech loading guns in broadside mounts
on side ends, evenly spread
2 - 6,69" / 170 mm guns in single mounts, 136,41lbs / 61,88kg shells, 1884 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
4 - 5,91" / 150 mm guns in single mounts, 93,71lbs / 42,51kg shells, 1884 Model
Breech loading guns in broadside mounts
on side, all amidships
Weight of broadside 1 193 lbs / 541 kg
Shells per gun, main battery: 200
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6,69" / 170 mm 187,01 ft / 57,00 m 12,47 ft / 3,80 m
Ends: Unarmoured
Main Belt covers 123% of normal length
- Armour deck: 1,18" / 30 mm, Conning tower: 7,87" / 200 mm
Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 1 shaft, 3 832 ihp / 2 858 Kw = 15,00 kts
Range 3 500nm at 8,00 kts
Bunker at max displacement = 400 tons (100% coal)
Complement:
349
Cost:
£0,327 million / $1,310 million
Distribution of weights at normal displacement:
Armament: 149 tons, 4,5%
Armour: 917 tons, 27,7%
- Belts: 673 tons, 20,3%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 0 tons, 0,0%
- Armour Deck: 207 tons, 6,2%
- Conning Tower: 38 tons, 1,1%
Machinery: 724 tons, 21,9%
Hull, fittings & equipment: 1 088 tons, 32,9%
Fuel, ammunition & stores: 433 tons, 13,1%
Miscellaneous weights: 0 tons, 0,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3 668 lbs / 1 664 Kg = 26,9 x 6,7 " / 170 mm shells or 0,8 torpedoes
Stability (Unstable if below 1.00): 1,38
Metacentric height 2,9 ft / 0,9 m
Roll period: 11,8 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0,43
Seaboat quality (Average = 1.00): 2,00
Hull form characteristics:
Hull has low forecastle, low quarterdeck
Block coefficient: 0,767
Length to Beam Ratio: 4,90 : 1
'Natural speed' for length: 15,27 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -10,00 degrees
Stern overhang: 2,95 ft / 0,90 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15,09 ft / 4,60 m
- Forecastle (13%): 14,76 ft / 4,50 m (18,04 ft / 5,50 m aft of break)
- Mid (50%): 16,73 ft / 5,10 m
- Quarterdeck (10%): 13,78 ft / 4,20 m (16,73 ft / 5,10 m before break)
- Stern: 13,78 ft / 4,20 m
- Average freeboard: 16,44 ft / 5,01 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 107,2%
- Above water (accommodation/working, high = better): 141,4%
Waterplane Area: 9 453 Square feet or 878 Square metres
Displacement factor (Displacement / loading): 92%
Structure weight / hull surface area: 78 lbs/sq ft or 380 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,86
- Longitudinal: 3,90
- Overall: 1,00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
(załoga 349 - zwiększona ze względu na przewidywane pomocnicze ożaglowanie okrętu).
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