Parthian Ships 1928 +

[Kaiser Kirk]

I don't have room for this in my 1934HY2,

I am thinking a new version of the 'Royal Mail' fast mail/cargo/passengers is useful.
The Royal Marriages in Wilno and Azteca helped drive home just how far it is.

I have finished my Ahanita 'Mercy' ships, and will be building the 8th Hamberkastig Fleet Supply
vessel, and 6/8 planned Royn Oilers. That will bring me to 18 Fleet Supply Vessels, 8 oilers, and a bunch of fleet light tenders. Plus some supply barges.

I don't know how many I really need, but that seems a reasonable investment, and will support most of my fleet on extended overseas deployments.

After those runs are done...I'll have some spare BP to allocate.

At 14880 they cost the same.
The fuel faction is about the maximum (slightly over) you see with USN ships.

A handful of these would provide regular high speed service across Parthia.
More than a handfull would be an unreasonabley high storyline cost.

On Auxiliaries and conversions
The problem of avoiding making a vessel that would be a logical carrier conversion
but keeping the cruise speed high was one I had to think on. This also relates to Foxy's old distaste for limiting 'reasonable' speeds for auxiliaries and what a 'reasonable' call would be for that.

I think turbines can run at like 80% power reliably. I am unsure about Marine Diesel engines.
But the D-E drive and a 75% need should mean some can be offline for regular maintenance while the ship proceeds at full cruise. Picking a high % meant I only needed a little power over that,
so max speed is only 24 knots - below everyone's newer capital ships, and lower than early carrier launch speeds. So too slow to magically become a stealth fleet Carrier.

Wabash, Parthia Cargo-Liner laid down 1935

Displacement:
    14,880 t light; 15,324 t standard; 18,942 t normal; 21,836 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
    (622.17 ft / 610.24 ft) x 85.30 ft x (19.69 / 22.17 ft)
    (189.64 m / 186.00 m) x 26.00 m  x (6.00 / 6.76 m)

Armament:
      8 - 4.72" / 120 mm 47.0 cal guns - 55.12lbs / 25.00kg shells, 200 per gun
      Dual purpose guns in deck mounts, 1935 Model
      8 x Single mounts on sides, evenly spread
      16 - 1.18" / 30.0 mm 80.0 cal guns - 0.94lbs / 0.43kg shells, 2,000 per gun
      Anti-air guns in deck mounts, 1929 Model
      6 x 2-gun mounts on sides, evenly spread
        6 raised mounts
      2 x 2-gun mounts on centreline ends, evenly spread
        2 double raised mounts
      Weight of broadside 456 lbs / 207 kg

Armour:
  - Belts:        Width (max)    Length (avg)        Height (avg)
    Ends:    Unarmoured

  - Torpedo Bulkhead - Additional damage containing bulkheads:
        0.98" / 25 mm    396.65 ft / 120.90 m    18.90 ft / 5.76 m
    Beam between torpedo bulkheads 45.93 ft / 14.00 m

  - Hull void:
        0.00" / 0 mm      0.00 ft / 0.00 m    0.00 ft / 0.00 m

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

Machinery:
    Diesel Internal combustion generators,
    Electric motors, 4 shafts, 42,358 shp / 31,599 Kw = 24.00 kts
    Range 7,632nm at 22.00 kts
    Bunker at max displacement = 6,512 tons

Complement:
    806 - 1,049

Cost:
    £3.631 million / $14.524 million

Distribution of weights at normal displacement:
    Armament: 95 tons, 0.5 %
      - Guns: 95 tons, 0.5 %
    Armour: 295 tons, 1.6 %
      - Torpedo bulkhead: 273 tons, 1.4 %
      - Armament: 22 tons, 0.1 %
    Machinery: 1,203 tons, 6.4 %
    Hull, fittings & equipment: 6,060 tons, 32.0 %
    Fuel, ammunition & stores: 4,062 tons, 21.4 %
    Miscellaneous weights: 7,227 tons, 38.2 %
      - Hull below water: 2,692 tons
      - Hull void weights: 50 tons
      - Hull above water: 2,050 tons
      - On freeboard deck: 2,240 tons
      - Above deck: 195 tons

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      60,820 lbs / 27,588 Kg = 1,153.6 x 4.7 " / 120 mm shells or 9.4 torpedoes
    Stability (Unstable if below 1.00): 1.33
    Metacentric height 6.6 ft / 2.0 m
    Roll period: 14.0 seconds
    Steadiness    - As gun platform (Average = 50 %): 100 %
            - Recoil effect (Restricted arc if above 1.00): 0.03
    Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
    Hull has a flush deck,
      a ram bow and small transom stern
    Block coefficient (normal/deep): 0.647 / 0.662
    Length to Beam Ratio: 7.15 : 1
    'Natural speed' for length: 26.68 kts
    Power going to wave formation at top speed: 47 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): 22.00 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 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Forward deck:    30.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Aft deck:    35.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Quarter deck:    15.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Average freeboard:        29.53 ft / 9.00 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 93.7 %
        - Above water (accommodation/working, high = better): 284.7 %
    Waterplane Area: 40,798 Square feet or 3,790 Square metres
    Displacement factor (Displacement / loading): 186 %
    Structure weight / hull surface area: 104 lbs/sq ft or 506 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.93
        - Longitudinal: 1.87
        - Overall: 1.00
    Adequate machinery, storage, compartmentation space
    Excellent 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

With the Royal Marriage to the Aztecs, and increasing links to Wilno,
there is a perceived need for a new "Royal Mail"
style vessel to deliver passengers or cargo at speed over long distances.

Cruise speed is meant to be maintained on 75% oower indefinitely.
Metagame : That seems a reasonable buffer for machinery reliability, but limits top speed to 24knots, reducing the reasonableness to be magically transformed to a stealth carrier.

High Cruise speed is thought to offer protection against subs and interception. The vessel will move over 1000nm in 2 days.

Crucially, the ship will steam 12,000nm in 23 days.

A TDS is mounted, meant to prevent mines and aerial torpedos from dealing critical damage. An AA Battery is mounted, with a secondary capacity against the unlikely pirate, or more likely destroyer that catches the vessel.
Against cruisers, surrender would be the option.


Normal Displacement : 18,942
2% = 378  military equipment allowed

273    TDS
95  Guns, Mounts, Armor
-----
368



Motive Power

Engines : 1203 * (1+0.3+0.25) = 1865 total
662 misc

Range : 7632 * 1.9 = 14,500.8nm
This allows a high speed run to the other side of the world.

Misc weight
50t - Reserve

AD
95t - Fire Control 1930
25t - LR Radio
0t - SR Radio
25t - Hulesmeyer proximity detector

OD
5t  -  Paravanes
200t  - 10 VIP passengers
2000t - 250 1st Class passengers
30t - Mail Plane (Walrus-style amphibian)
5t - Catapult on fantail.


HAW
5t - Hanger in Stern
1000t - 250 2nd Class Passengers
1000t - Cargo
30t - CO2 compressor AC
15t - Extra Fire Ext.

HBW
2000t - Cargo
15t - Extra Pumps
15t - Extra Fire Ext.
662t - Diesel-Electric Drive

Decks

9.00  Weather Deck
6.50  3rd Deck
4.00  2nd Deck
1.50  Main Deck
-1.00 1st Deck
-4.75 Engineering
-5.76  Double Bottom
-6.00  Keel