Incan Ships 1913+

[Desertfox]

Maddox mentioned needing a coastal/river general purpose transport. Can carry 100t of stuff, mixed firing so can use whatever fuel is available. Big enough to carry a single 40t MTB, can be converted into a MTB "repair shop"/tender capable of supporting five 40t MTBs.

Yma Maru, Inca Coastal Transport laid down 1913

Displacement:
   200 t light; 206 t standard; 217 t normal; 226 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (160.00 ft / 160.00 ft) x 27.00 ft x (3.20 / 3.30 ft)
   (48.77 m / 48.77 m) x 8.23 m  x (0.98 / 1.01 m)

Armament:
      3 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 250 per gun
     Quick firing guns in deck mount, 1913 Model
     1 x Triple mount on centreline, forward deck forward
      Weight of broadside 12 lbs / 5 kg

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Electric motors, 2 shafts, 80 ihp / 60 Kw = 8.00 kts
   Range 1,550nm at 8.00 kts
   Bunker at max displacement = 20 tons (50% coal)

Complement:
   27 - 36

Cost:
   £0.009 million / $0.037 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 1.0 %
      - Guns: 2 tons, 1.0 %
   Machinery: 5 tons, 2.3 %
   Hull, fittings & equipment: 90 tons, 41.5 %
   Fuel, ammunition & stores: 17 tons, 7.8 %
   Miscellaneous weights: 103 tons, 47.4 %
      - Hull below water: 2 tons
      - On freeboard deck: 100 tons
      - Above deck: 1 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,641 lbs / 1,198 Kg = 660.2 x 2.0 " / 51 mm shells or 4.8 torpedoes
   Stability (Unstable if below 1.00): 1.28
   Metacentric height 1.1 ft / 0.3 m
   Roll period: 10.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
   Hull has raised forecastle, raised quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.555
   Length to Beam Ratio: 5.93 : 1
   'Natural speed' for length: 12.65 kts
   Power going to wave formation at top speed: 21 %
   Trim (Max stability = 0, Max steadiness = 100): 62
   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 %,  8.00 ft / 2.44 m,  8.00 ft / 2.44 m
      - Forward deck:   30.00 %,  5.00 ft / 1.52 m,  5.00 ft / 1.52 m
      - Aft deck:   30.00 %,  5.00 ft / 1.52 m,  5.00 ft / 1.52 m
      - Quarter deck:   20.00 %,  8.00 ft / 2.44 m,  8.00 ft / 2.44 m
      - Average freeboard:      6.20 ft / 1.89 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 13.8 %
      - Above water (accommodation/working, high = better): 106.3 %
   Waterplane Area: 3,015 Square feet or 280 Square metres
   Displacement factor (Displacement / loading): 182 %
   Structure weight / hull surface area: 25 lbs/sq ft or 121 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.23
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

100t- Supplies
2t - Electric Drive
1t - Spare

[Desertfox]

Did drawings of several versions of Inca barges, the top two are based on the "Yma Maru" design posted previously.

1) MTB Tender
2) General purpose transport
3) Gunbarge
4) Harbor protection torpedo support
5) "Holy festival" support

[maddox]

The Inca are investing in those small barges. Originaly to increase river trade on the Amazon, and maintain the Manaus protectorate.   
They are intented for rivers and protected waters, but have litorial capacity.

Some clever people came up with plans to "militarise" these platforms

From top to bottom
MTB tender. 
Transport barge,  can be used as troop transport.
River gun barge, can also augment port defenses.
Torpedo support barge. Also useable as mobile torpedo base.
Holy festival support barge.

OOC,
These designs , except the transport barge, are military vessels, and will not fall under auxilary upkeep.