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Wednesday, November 21st 2018, 6:44pm

New Peruvian Ship Concept

I’ve been kicking around possible ideas for future Peruvian naval construction – not so much in warships as in ships that can contribute to regional development in a meaningful way. The Armada has transports – and I am building a new class of those already. I’m imagining a multi-purpose sort of vessel, but can’t come up with parameters and specific roles.

Anyone have suggestions?

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Thursday, November 22nd 2018, 2:48am

RE: New Peruvian Ship Concept

I’ve been kicking around possible ideas for future Peruvian naval construction – not so much in warships as in ships that can contribute to regional development in a meaningful way. The Armada has transports – and I am building a new class of those already. I’m imagining a multi-purpose sort of vessel, but can’t come up with parameters and specific roles.

Anyone have suggestions?
In real life we are currently building the PIAS (Plataforma Itinerante de Acción Social), which are a mix of floating hospitals, government offices, child services, banks and social projects ship. So something similar might be a good starting point. Although they are only riverine ships.

They look like this

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Thursday, November 22nd 2018, 3:20am

This is precisely the sort of ship I had in mind.

Do you have any information on the size of these craft? I haven't the facilities to build something too large on the upper Amazon, and I don't know if such a vessel would be useful operating on Peru's Pacific Coast. Do you think a sea-going vessel would be useful?

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Thursday, November 22nd 2018, 4:43am

This is precisely the sort of ship I had in mind.

Do you have any information on the size of these craft? I haven't the facilities to build something too large on the upper Amazon, and I don't know if such a vessel would be useful operating on Peru's Pacific Coast. Do you think a sea-going vessel would be useful?

SIMA says the PIAS characteristics are:
Length: 44 meters
Beam: 7 Meters
Draught: 1.2 meters
Displacement: 226 Tons
Propulsion: 2x 250 BHP engines
Speed: 10 Knots
Autonomy: 150 Hours/45 days on port
Crew: 21 + 23 government officials (as per El Comercio)

About the pacific coast, the navy currently prefers specialized vessels since there isn't such a large lack of infraestructure on the pacific coast. That said the RL navy is currently searching for more logistics support crafts and landing crafts (LCU types from what i have seen) from experience from the last few years.

5

Thursday, November 22nd 2018, 12:42pm

Thank you so very much for this information. I will try to work up a WW version and she what Springsharp can deliver.

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Thursday, November 22nd 2018, 11:45pm

Submitted for your review is my take on the Plataforma Itinerante de Acción Social; suggestions on how to outfit the craft are quite welcome.

Pucalipa, Peruvian Plataforma Itinerante de Acción Social laid down 1949

Displacement: 195 t light; 199 t standard; 205 t normal; 210 t full load

Dimensions: Length overall / water x beam x draught

45.66 ft / 144.36 ft x 22.97 ft x 3.94 ft (normal load) [44.40 m / 44.00 m x 7.00 m x 1.20 m]

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 266 shp / 199 Kw = 12.00 kts
Range 2,000nm at 8.00 kts
Bunker at max displacement = 10 tons

Complement: 26 - 35

Cost: £0.059 million / $0.236 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Machinery: 6 tons, 3.1 %
Hull, fittings & equipment: 89 tons, 43.2 %
Fuel, ammunition & stores: 10 tons, 4.8 %
Miscellaneous weights: 100 tons, 48.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 630 lbs / 286 Kg = 5.8 x 6 " / 152 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.7 ft / 0.2 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.90

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.550
Length to Beam Ratio: 6.29: 1
'Natural speed' for length: 14.18 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 38
Bow angle (Positive = bow angles forward): 9.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 8.20 ft / 2.50 m
- Forecastle (20 %): 8.20 ft / 2.50 m
- Mid (50 %): 8.20 ft / 2.50 m
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 8.20 ft / 2.50 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 64.0 %
- Above water (accommodation/working, high = better): 144.7 %
Waterplane Area: 2,408 Square feet or 224 Square meters
Displacement factor (Displacement / loading): 182 %
Structure weight / hull surface area: 26 lbs/sq ft or 125 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.86
- Overall: 1.02
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, rides out heavy weather easily

Constructed under the small craft rules. Intended for riverine service

Breakdown of miscellaneous weight:

20 tons for a small operating theatre
15 tons for a medical dispensary
40 tons for two small class/meeting rooms
15 tons for small workshops
10 tons for storerooms for supplies and consumables

Tentative names: Pucalipa, Iparia, Atelaya, and Kiriqueti

7

Saturday, November 24th 2018, 10:00am

I like the concept and the SS report seems very feasible. Not sure I can add anything specialist to this design, it looks a useful little craft.

Surprised on the lack of anti-piranha miniguns though! :D