(http://img14.imageshack.us/img14/8146/nversenclass.jpg)
N class, Holland auxiliary laid down 1916
Displacement:
3,536 t light; 3,620 t standard; 4,214 t normal; 4,688 t full load
Dimensions: Length overall / water x beam x draught
393.70 ft / 393.70 ft x 49.21 ft x 13.12 ft (normal load)
120.00 m / 120.00 m x 15.00 m x 4.00 m
Armour:
- Conning tower: 0.98" / 25 mm
Machinery:
Diesel Internal combustion generators,
Electric motors, 4 shafts, 23,313 shp / 17,392 Kw = 25.00 kts
Range 10,000nm at 12.00 kts
Bunker at max displacement = 1,068 tons
Complement:
260 - 339
Cost:
£0.402 million / $1.606 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 6 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 6 tons, 0.1 %
Machinery: 869 tons, 20.6 %
Hull, fittings & equipment: 1,412 tons, 33.5 %
Fuel, ammunition & stores: 678 tons, 16.1 %
Miscellaneous weights: 1,250 tons, 29.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
5,142 lbs / 2,332 Kg = 399.5 x 6 " / 152 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 2.1 ft / 0.6 m
Roll period: 14.3 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.03
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.580
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 19.84 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.82 ft / 6.65 m
- Forecastle (20 %): 13.88 ft / 4.23 m
- Mid (50 %): 13.88 ft / 4.23 m
- Quarterdeck (15 %): 13.88 ft / 4.23 m
- Stern: 13.88 ft / 4.23 m
- Average freeboard: 14.51 ft / 4.42 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 99.5 %
- Above water (accommodation/working, high = better): 141.4 %
Waterplane Area: 13,908 Square feet or 1,292 Square metres
Displacement factor (Displacement / loading): 141 %
Structure weight / hull surface area: 70 lbs/sq ft or 340 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.09
- Longitudinal: 1.40
- Overall: 1.11
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
1200 tons misc.
25 tons radio
25 tons navigation radar
25 tons acoustics
The speed seems high for a tender...but I can live with it. I'd add some armarment, even if only a few AA guns, myself, but each to his own...
I would push the displacement up a bit, as the smallest ports take 5000tons.
I would dispense with the electric generators as harder to service in civilian facilities. I expect 2 shafts would be adequate as well.
I question the speed priorities. The Dash speed is still low enough as to be unable to avoid even old small cruisers, yet eats a great deal of displacement, while the cruise speed is set fairly low (which may be for consistancy). In a similar vessel, I went with a lower top speed, but a higher cruise speed. Dedicated warships can catch her, but AMC and subs can't.