Colliers/Tankers

[Carthaginian]

Ok, I am designing a collier for my little fleet, and I have decided that I wanted to take this question to 'John Q. Public' to get a good opinion.

The ship is a stumpy little girl; short and broad in the middle with unflattering lines similar to a cast-iton bathtub. Her draft is 18'/5.49m under her Normal displacement laden with 3000 tons of coal (1500 tons as cargo and 1900 tons as bunker, with 400 being specifically for the ship). HOWEVER, when she is at 'full load' and has her 'maximum bunker' loaded (which we don't really consider here) she will draw 21.92'/6.68m and carry an additional 1520 tons of coal!

So, the options on the poll are clear- does a vessel carrying fuel for the fleet:
1.) carry only the Normal Displacement value and use the "Cargo x2" value to supply other ships?
2.) carry the Full Load value, but only get to use the "Cargo x2" value to supply other ships?

Option 1 means that we just ignore any extended range from the Full Load bunkerage figures.
Option 2 means that the ship has a far greater range, that will need to be calculated 'by hand' so to speak.

"Cargo x2" is taken to mean that the fuel available for transfer to other vessels is stored half as cargo and half as bunker fuel- the available tonnage, however, is basically 'Cargo Weight x2.' Anything beyond that would only be available to the ship itself and would not be transferable.


Also, if you have something to say regarding Daft Increase and 'how much is too much' you can include that in a post. :)

[KWorld]

For colliers & oilers, given that SS3 allows the designer to allocate miscellaneous weight below the waterline, why would you allocate part of the "cargo" weight as bunker?  In SS2, you had to, because all of it's miscellaneous weight was above the waterline, but that's not the case any more with SS3.


Collier, Test Collier laid down 1908

Displacement:
   10,753 t light; 10,979 t standard; 11,260 t normal; 11,485 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.70 ft / 393.70 ft) x 65.62 ft x (24.61 / 25.02 ft)
   (120.00 m / 120.00 m) x 20.00 m  x (7.50 / 7.63 m)

Armament:
      2 - 1.97" / 50.0 mm 45.0 cal guns - 3.85lbs / 1.74kg shells, 150 per gun
     Quick firing guns in deck mounts, 1895 Model
     2 x Single mounts on sides, forward deck forward
      2 raised mounts
      4 - 0.31" / 8.0 mm 70.0 cal guns - 0.02lbs / 0.01kg shells, 1,200 per gun
     Machine guns in deck mounts, 1900 Model
     4 x Single mounts on side ends, evenly spread
      4 double raised mounts
      Weight of broadside 8 lbs / 4 kg

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 1 shaft, 1,495 ihp / 1,115 Kw = 10.00 kts
   Range 3,000nm at 8.00 kts
   Bunker at max displacement = 506 tons (100% coal)

Complement:
   546 - 710

Cost:
   £0.396 million / $1.584 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.0 %
      - Guns: 2 tons, 0.0 %
   Machinery: 136 tons, 1.2 %
   Hull, fittings & equipment: 2,066 tons, 18.3 %
   Fuel, ammunition & stores: 507 tons, 4.5 %
   Miscellaneous weights: 8,550 tons, 75.9 %
      - Hull below water: 5,000 tons
      - Hull above water: 3,550 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     10,876 lbs / 4,933 Kg = 2,851.5 x 2.0 " / 50 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 1.38
   Metacentric height 4.7 ft / 1.4 m
   Roll period: 12.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 84 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.67

Hull form characteristics:
   Hull has rise forward of midbreak, raised quarterdeck ,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.620 / 0.622
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 20 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  21.82 ft / 6.65 m,  17.85 ft / 5.44 m
      - Forward deck:   0.00 %,  17.85 ft / 5.44 m,  17.85 ft / 5.44 m
      - Aft deck:   65.00 %,  8.92 ft / 2.72 m,  8.92 ft / 2.72 m
      - Quarter deck:   15.00 %,  17.85 ft / 5.44 m,  18.93 ft / 5.77 m
      - Average freeboard:      12.45 ft / 3.79 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 86.8 %
      - Above water (accommodation/working, high = better): 58.8 %
   Waterplane Area: 18,891 Square feet or 1,755 Square metres
   Displacement factor (Displacement / loading): 128 %
   Structure weight / hull surface area: 76 lbs/sq ft or 370 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.38
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Cramped 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

[KWorld]

And a smaller collier, but still able to carry over 4500 tons of coal.

Collier, Test Collier laid down 1908

Displacement:
   5,743 t light; 5,863 t standard; 6,006 t normal; 6,119 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (328.08 ft / 328.08 ft) x 52.49 ft x (19.69 / 20.00 ft)
   (100.00 m / 100.00 m) x 16.00 m  x (6.00 / 6.10 m)

Armament:
      2 - 1.97" / 50.0 mm 45.0 cal guns - 3.86lbs / 1.75kg shells, 150 per gun
     Quick firing guns in deck mounts, 1895 Model
     2 x Single mounts on sides, forward deck forward
      2 raised mounts
      4 - 0.31" / 8.0 mm 70.0 cal guns - 0.02lbs / 0.01kg shells, 1,200 per gun
     Machine guns in deck mounts, 1900 Model
     4 x Single mounts on side ends, evenly spread
      4 double raised mounts
      Weight of broadside 8 lbs / 4 kg

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 1 shaft, 500 ihp / 373 Kw = 8.00 kts
   Range 4,000nm at 6.00 kts
   Bunker at max displacement = 256 tons (100% coal)

Complement:
   340 - 443

Cost:
   £0.208 million / $0.831 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.0 %
      - Guns: 2 tons, 0.0 %
   Machinery: 45 tons, 0.8 %
   Hull, fittings & equipment: 1,165 tons, 19.4 %
   Fuel, ammunition & stores: 263 tons, 4.4 %
   Miscellaneous weights: 4,530 tons, 75.4 %
      - Hull below water: 3,000 tons
      - Hull above water: 1,530 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6,540 lbs / 2,967 Kg = 1,714.8 x 2.0 " / 50 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.44
   Metacentric height 3.6 ft / 1.1 m
   Roll period: 11.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 97 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.94

Hull form characteristics:
   Hull has raised forecastle, raised quarterdeck ,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.620 / 0.622
   Length to Beam Ratio: 6.25 : 1
   'Natural speed' for length: 18.11 kts
   Power going to wave formation at top speed: 15 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  22.97 ft / 7.00 m,  17.22 ft / 5.25 m
      - Forward deck:   30.00 %,  9.02 ft / 2.75 m,  9.02 ft / 2.75 m
      - Aft deck:   35.00 %,  9.02 ft / 2.75 m,  9.02 ft / 2.75 m
      - Quarter deck:   15.00 %,  17.22 ft / 5.25 m,  18.37 ft / 5.60 m
      - Average freeboard:      12.44 ft / 3.79 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 84.9 %
      - Above water (accommodation/working, high = better): 63.5 %
   Waterplane Area: 12,594 Square feet or 1,170 Square metres
   Displacement factor (Displacement / loading): 130 %
   Structure weight / hull surface area: 62 lbs/sq ft or 301 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.58
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Cramped 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

[Carthaginian]

OK, we have the results.
They will be incorporated into the rules.

[Delta Force]

I am designing a series of speedy replenishment ships to accompany my fleets and do not really know how we are supposed to account for the extra coal and other weights (like ammunition). Can someone please clarify how we are supposed to handle the situation in practice?