Iberia, Patrol and Support Ships

[miketr]

I have trouble designing small ships.  I am looking for some suggestions for the following.

1) A light transport to move troops and material about the various islands of the Philippines.  Would be able to move a company of men 250 (500 misc tons) and have five platoon landing craft 50 men each (65 misc tons for the five landing craft) and a crane (65 tons).  Plus 125 tons of general stores for a total of 755 misc tons.  Speed would be 15 knots, a 50mm or 75mm or 105mm gun with DD-FC so 780 tons.  Shallow draft would be helpful.

2) A show the flag / customs patrol boat.  200 to 500 light tons, with Diesel engines, max shp of 2,000.  A 75mm or 105mm gun with DD-FC (25 misc tons) + another 75 tons for other needs for a total of 100 misc tons.  At least 17 knots speed.

[Carthaginian]

The CSA offers this design, considered for it's own use, for Requirement 2. It is very inexpensive, relatively fast and has a good range and cargo capacity.

laid down 1919 (Engine 1916)

Displacement:
   400 t light; 413 t standard; 466 t normal; 508 t full load

Dimensions: Length overall / water x beam x draught
   225.00 ft / 225.00 ft x 25.00 ft x 6.00 ft (normal load)
   68.58 m / 68.58 m x 7.62 m  x 1.83 m

Armament:
      1 - 2.99" / 76.0 mm guns in single mounts, 13.23lbs / 6.00kg shells, 1919 Model
     Quick firing gun in deck mount
     on centreline forward
      4 - 0.98" / 25.0 mm guns in single mounts, 0.55lbs / 0.25kg shells, 1919 Model
     Machine guns in deck mounts
     on side, all amidships, 2 raised mounts - superfiring
      1 - 1.46" / 37.0 mm guns in single mounts, 1.65lbs / 0.75kg shells, 1919 Model
     Anti-aircraft gun in deck mount
     on centreline aft, 1 raised gun
   Weight of broadside 17 lbs / 8 kg
   Shells per gun, main battery: 300

Machinery:
   Diesel Internal combustion motors,
   Direct drive, 2 shafts, 1,700 shp / 1,268 Kw = 17.50 kts
   Range 5,000nm at 10.00 kts
   Bunker at max displacement = 96 tons

Complement:
   49 - 65

Cost:
   £0.054 million / $0.215 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.5 %
   Machinery: 63 tons, 13.6 %
   Hull, fittings & equipment: 235 tons, 50.4 %
   Fuel, ammunition & stores: 66 tons, 14.1 %
   Miscellaneous weights: 100 tons, 21.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,281 lbs / 581 Kg = 95.7 x 3.0 " / 76 mm shells or 0.8 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 11.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.05
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.483
   Length to Beam Ratio: 9.00 : 1
   'Natural speed' for length: 15.00 kts
   Power going to wave formation at top speed: 47 %
   Trim (Max stability = 0, Max steadiness = 100): 25
   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:      19.00 ft / 5.79 m
      - Forecastle (15 %):   16.00 ft / 4.88 m
      - Mid (50 %):      16.00 ft / 4.88 m (8.00 ft / 2.44 m aft of break)
      - Quarterdeck (15 %):   8.00 ft / 2.44 m
      - Stern:      8.00 ft / 2.44 m
      - Average freeboard:   12.18 ft / 3.71 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 72.2 %
      - Above water (accommodation/working, high = better): 172.2 %
   Waterplane Area: 3,692 Square feet or 343 Square metres
   Displacement factor (Displacement / loading): 191 %
   Structure weight / hull surface area: 31 lbs/sq ft or 154 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.84
      - Longitudinal: 4.79
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

I'd point to the Colombian Pitalito class for patrol boats.  Hasn't formally got FC, but there's enough miscellaneous weight to allow for its addition.

As for transports, without fine-tuning:

Coaster, laid down 1916

Displacement:
   1,927 t light; 1,975 t standard; 2,209 t normal; 2,397 t full load

Dimensions: Length overall / water x beam x draught
   332.08 ft / 328.08 ft x 55.77 ft x 7.55 ft (normal load)
   101.22 m / 100.00 m x 17.00 m  x 2.30 m

Armament:
      1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1916 Model
     Breech loading gun in deck mount
     on centreline aft
      1 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1916 Model
     Anti-aircraft gun in deck mount
     on centreline forward
      4 - 0.31" / 8.0 mm guns in single mounts, 0.02lbs / 0.01kg shells, 1916 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 37 lbs / 17 kg
   Shells per gun, main battery: 150

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.39" / 10 mm            -
   2nd:   0.39" / 10 mm         -               -
   3rd:   0.39" / 10 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 2,563 shp / 1,912 Kw = 15.00 kts
   Range 3,000nm at 15.00 kts (Bunkerage = 422 tons)

Complement:
   160 - 209

Cost:
   £0.139 million / $0.554 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 0.2 %
   Armour: 2 tons, 0.1 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 2 tons, 0.1 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 95 tons, 4.3 %
   Hull, fittings & equipment: 1,070 tons, 48.4 %
   Fuel, ammunition & stores: 282 tons, 12.8 %
   Miscellaneous weights: 755 tons, 34.2 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     9,706 lbs / 4,403 Kg = 274.8 x 4.1 " / 105 mm shells or 2.4 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 3.1 ft / 0.9 m
   Roll period: 13.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.560
   Length to Beam Ratio: 5.88 : 1
   'Natural speed' for length: 18.11 kts
   Power going to wave formation at top speed: 35 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      22.64 ft / 6.90 m
      - Forecastle (20 %):   19.69 ft / 6.00 m
      - Mid (50 %):      19.69 ft / 6.00 m
      - Quarterdeck (15 %):   19.69 ft / 6.00 m
      - Stern:      19.69 ft / 6.00 m
      - Average freeboard:   19.92 ft / 6.07 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 53.9 %
      - Above water (accommodation/working, high = better): 302.1 %
   Waterplane Area: 12,891 Square feet or 1,198 Square metres
   Displacement factor (Displacement / loading): 224 %
   Structure weight / hull surface area: 58 lbs/sq ft or 283 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.87
      - Longitudinal: 3.19
      - Overall: 1.00
   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, can fire her guns in the heaviest weather

[miketr]

Some interesting designs Carth and Rocky.

[TexanCowboy]

If I may...

I get a lot of support from the Commonwealth of Russia: Auxillaries: Transports thread. I think, that for your purposes, there are several proposals in there that fit your specs.

For example, this may be of use:

These larger motorized barges provide additional critical supply service for naval vessels. It has also dawned on the Naval Command they would be useful for a seabourne assault.

45m Barge, Imperial Russia Coaster/Landing Ship laid down 1917 (Engine 1916)

Displacement:
   256 t light; 262 t standard; 275 t normal; 285 t full load

Dimensions: Length overall / water x beam x draught
   148.00 ft / 148.00 ft x 25.00 ft x 4.00 ft (normal load)
   45.11 m / 45.11 m x 7.62 m  x 1.22 m

Armament:
      1 - 1.85" / 47.0 mm guns in single mounts, 3.00lbs / 1.36kg shells, 1917 Model
     Quick firing gun in deck mount
     on centreline aft
   Weight of broadside 3 lbs / 1 kg
   Shells per gun, main battery: 150

Machinery:
   Petrol Internal combustion motors,
   Direct drive, 1 shaft, 120 shp / 89 Kw = 8.71 kts
   Range 4,500nm at 6.00 kts
   Bunker at max displacement = 23 tons

Complement:
   33 - 43

Cost:
   £0.018 million / $0.072 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.1 %
   Machinery: 4 tons, 1.6 %
   Hull, fittings & equipment: 86 tons, 31.5 %
   Fuel, ammunition & stores: 19 tons, 6.7 %
   Miscellaneous weights: 165 tons, 60.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     500 lbs / 227 Kg = 157.9 x 1.9 " / 47 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 0.8 ft / 0.3 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 52 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.11

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.650
   Length to Beam Ratio: 5.92 : 1
   'Natural speed' for length: 12.17 kts
   Power going to wave formation at top speed: 29 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   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:      6.00 ft / 1.83 m
      - Forecastle (30 %):   5.00 ft / 1.52 m
      - Mid (50 %):      5.00 ft / 1.52 m
      - Quarterdeck (15 %):   5.00 ft / 1.52 m
      - Stern:      5.50 ft / 1.68 m
      - Average freeboard:   5.16 ft / 1.57 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 72.2 %
      - Above water (accommodation/working, high = better): 80.7 %
   Waterplane Area: 2,795 Square feet or 260 Square metres
   Displacement factor (Displacement / loading): 155 %
   Structure weight / hull surface area: 25 lbs/sq ft or 122 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.02
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is cramped

Cost: $0.072    0.068BP     6 Months    Civilian+full motor

Misc. Weight(165 Tons):
165 Tons Troops

[miketr]

I think I need to put some more effort into my fleet support train.

Cost $2.5 & 0.625 BP, 10K of ships can be supported.  So one of this ships to support a Destroyer Division (5 ships) made up of 2,000 ton designs.

Cost $12 & 3 BP, 54K of ships can be supported.  These are to support capital ships.

Also build a type 2+ Floating DD for $10.5/9BP

Total order to be 4 of the destroyer tenders $10 & 2.5 BP, 2 of the fleet tenders $24 & 6 BP and the floating Dry Dock $10.5 & 9 BP.  Grand total of $44.5 & 17.5 BP.  Other support ships will also be needed such as more tankers.  Other additions being considered, the formation of a 2nd Naval Infantry Corps and building of more Assault Ships.  Currently the Armada can land One Brigade of Infantry in assault configuration.

This is an effort to allow the Armada to conduct Expeditionary Warfare.

AR 7, Iberia Depot and Repair Ship laid down 1922

Displacement:
   2,501 t light; 2,580 t standard; 3,879 t normal; 4,918 t full load

Dimensions: Length overall / water x beam x draught
   275.59 ft / 275.59 ft x 45.93 ft x 15.32 ft (normal load)
   84.00 m / 84.00 m x 14.00 m  x 4.67 m

Armament:
      1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1922 Model
     Anti-aircraft gun in deck mount
     on centreline forward
   Weight of broadside 13 lbs / 6 kg
   Shells per gun, main battery: 150

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 11,410 shp / 8,512 Kw = 20.00 kts
   Range 14,550nm at 15.00 kts
   Bunker at max displacement = 2,339 tons

Complement:
   245 - 319

Cost:
   £0.390 million / $1.561 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.0 %
   Armour: 0 tons, 0.0 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 0 tons, 0.0 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 387 tons, 10.0 %
   Hull, fittings & equipment: 862 tons, 22.2 %
   Fuel, ammunition & stores: 1,378 tons, 35.5 %
   Miscellaneous weights: 1,250 tons, 32.2 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5,886 lbs / 2,670 Kg = 457.3 x 3.0 " / 75 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 1.8 ft / 0.6 m
   Roll period: 14.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.700
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 16.60 kts
   Power going to wave formation at top speed: 63 %
   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 (% = measuring location as a percentage of overall length):
      - Stem:      14.44 ft / 4.40 m
      - Forecastle (20 %):   13.78 ft / 4.20 m
      - Mid (50 %):      13.12 ft / 4.00 m
      - Quarterdeck (15 %):   13.12 ft / 4.00 m
      - Stern:      13.12 ft / 4.00 m
      - Average freeboard:   13.41 ft / 4.09 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 68.6 %
      - Above water (accommodation/working, high = better): 104.7 %
   Waterplane Area: 10,146 Square feet or 943 Square metres
   Displacement factor (Displacement / loading): 190 %
   Structure weight / hull surface area: 58 lbs/sq ft or 281 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.05
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is adequate

1250 + 1250 bunkerage = 2,500 * 4 = 10,000 ton of support

AR 3 & 4, Iberia Repair Support Ship laid down 1922

Displacement:
   12,001 t light; 12,400 t standard; 18,793 t normal; 23,908 t full load

Dimensions: Length overall / water x beam x draught
   541.34 ft / 541.34 ft x 72.18 ft x 24.05 ft (normal load)
   165.00 m / 165.00 m x 22.00 m  x 7.33 m

Armament:
      4 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1922 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, evenly spread
      4 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1922 Model
     Breech loading guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 262 lbs / 119 kg
   Shells per gun, main battery: 150

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm         -               -
   2nd:   0.39" / 10 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 30,001 shp / 22,381 Kw = 21.52 kts
   Range 31,780nm at 15.00 kts
   Bunker at max displacement = 11,508 tons

Complement:
   802 - 1,043

Cost:
   £1.609 million / $6.437 million

Distribution of weights at normal displacement:
   Armament: 33 tons, 0.2 %
   Armour: 13 tons, 0.1 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 13 tons, 0.1 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 1,018 tons, 5.4 %
   Hull, fittings & equipment: 4,187 tons, 22.3 %
   Fuel, ammunition & stores: 6,792 tons, 36.1 %
   Miscellaneous weights: 6,750 tons, 35.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     31,366 lbs / 14,227 Kg = 594.9 x 4.7 " / 120 mm shells or 3.6 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 3.8 ft / 1.1 m
   Roll period: 15.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.03
   Seaboat quality  (Average = 1.00): 1.66

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.700
   Length to Beam Ratio: 7.50 : 1
   'Natural speed' for length: 23.27 kts
   Power going to wave formation at top speed: 47 %
   Trim (Max stability = 0, Max steadiness = 100): 42
   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:      19.69 ft / 6.00 m
      - Forecastle (20 %):   18.86 ft / 5.75 m
      - Mid (50 %):      18.04 ft / 5.50 m
      - Quarterdeck (15 %):   18.04 ft / 5.50 m
      - Stern:      18.04 ft / 5.50 m
      - Average freeboard:   18.40 ft / 5.61 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 58.9 %
      - Above water (accommodation/working, high = better): 135.6 %
   Waterplane Area: 31,318 Square feet or 2,910 Square metres
   Displacement factor (Displacement / loading): 207 %
   Structure weight / hull surface area: 93 lbs/sq ft or 455 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.16
      - Overall: 1.00
   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, can fire her guns in the heaviest weather

6750 tons + 6750 tons of bunker = 13,500 * 4 = 54,000 tons of support

[Sachmle]

I like. I've tried a few times to come up with a nice tender sim, and they all seem off. This is pretty solid, IMHO.

[Jefgte]

Late but...

Could I suggest the Navado class built originaly for Peru.
This class of 3500t Fleet tender is built with the possibility of different arrangements.
Fleet tender principaly but materials & troop transport are also a possibility.

NUS hope to built 2 more Nevado class in the next years

http://www.navalism.org/index.php?topic=5033.0