Fomhuireán

[Logi]

F1 Submarine

L x B x D:  180 ft x 15 ft x 10 ft  
Displacement:   426 t / 500 t
Engine: Two Petrol Engines - 430HP Each
Propellers:   1  
Speed surf/subm:   14 kts / 10 kts  
Range surf/subm:   2000 nm at 8 kts / 60 nm at 5 kts  
Diving depth:   150 m  
Complement:   27-36  
Torpedo tubes:   2 x 18" bow - 2 x 18" stern
Torpedo type:   1905 18" Imp. Wet Heater, 100kg warhead - 1 t each  
Armament:   6 torpedoes  
Guns:   1 x 90mm in deck mount with hoist - centerline aft
Other: Long-Range Wireless (25t)

Below for Full SS

RNS F1, Irish Submarine laid down 1913 (Engine 1909)

Displacement:
   500 t light; 512 t standard; 533 t normal; 550 t full load

Dimensions: Length overall / water x beam x draught
   180.00 ft / 180.00 ft x 15.00 ft x 10.00 ft (normal load)
   54.86 m / 54.86 m x 4.57 m  x 3.05 m

Armament:
     1 - 3.54" / 90.0 mm guns in single mounts, 22.24lbs / 10.09kg shells, 1913 Model
     Breech loading gun in a deck mount with hoist
     on centreline aft
   Weight of broadside 22 lbs / 10 kg
   Shells per gun, main battery: 150
   4 - 18.0" / 457.2 mm submerged torpedo tubes

Armour:
  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm   1.00" / 25 mm      1.00" / 25 mm

Machinery:
   Petrol Internal combustion motors,
   Direct drive, 1 shaft, 859 shp / 641 Kw = 14.00 kts
   Range 2,000nm at 8.00 kts
   Bunker at max displacement = 37 tons

Complement:
   27 - 36

Cost:
   £0.028 million / $0.110 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 0.5 %
   Armour: 3 tons, 0.5 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 3 tons, 0.5 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 39 tons, 7.3 %
   Hull, fittings & equipment: 350 tons, 65.8 %
   Fuel, ammunition & stores: 33 tons, 6.2 %
   Miscellaneous weights: 105 tons, 19.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     232 lbs / 105 Kg = 10.4 x 3.5 " / 90 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.03
   Metacentric height 0.3 ft / 0.1 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 0 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 0.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.691
   Length to Beam Ratio: 12.00 : 1
   'Natural speed' for length: 13.42 kts
   Power going to wave formation at top speed: 45 %
   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:      0.00 ft / 0.00 m
      - Forecastle (20 %):   0.00 ft / 0.00 m
      - Mid (50 %):      0.00 ft / 0.00 m
      - Quarterdeck (15 %):   0.00 ft / 0.00 m
      - Stern:      0.00 ft / 0.00 m
      - Average freeboard:   0.00 ft / 0.00 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 108.0 %
      - Above water (accommodation/working, high = better): 0.0 %
   Waterplane Area: 2,130 Square feet or 198 Square metres
   Displacement factor (Displacement / loading): 256 %
   Structure weight / hull surface area: 111 lbs/sq ft or 543 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 5.00
      - Longitudinal: 1.70
      - Overall: 2.22
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is extremely poor
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability

25t Long-Range Wireless
6t Torpedoes
74t Ballast Tanks

Ships:
F1 1913

[Logi]

F2 Submarine

L x B x D:  150 ft x 12 ft x 8 ft  
Displacement:   219 t / 250 t
Engine: One Diesel Engine
Propellers:   1  
Speed surf/subm:   12 kts / 10 kts  
Range surf/subm:   2000 nm at 8 kts / 60 nm at 5 kts  
Diving depth:   150 m  
Complement:   16-21  
Torpedo tubes:   2 x 18" bow
Torpedo type:   1905 18" Imp. Wet Heater, 100kg warhead - 1 t each  
Armament:   4 torpedoes  
Guns: None
Other: Long-Range Wireless (25t)

Below for Full SS

RNS F2, Irish Submarine laid down 1914 (Engine 1912)

Displacement:
   250 t light; 255 t standard; 267 t normal; 276 t full load

Dimensions: Length overall / water x beam x draught
   150.00 ft / 150.00 ft x 12.00 ft x 8.00 ft (normal load)
   45.72 m / 45.72 m x 3.66 m  x 2.44 m
   2 - 18.0" / 457.2 mm submerged torpedo tubes

Machinery:
   Diesel Internal combustion motors,
   Direct drive, 1 shaft, 328 shp / 245 Kw = 12.00 kts
   Range 2,000nm at 8.00 kts
   Bunker at max displacement = 21 tons

Complement:
   16 - 21

Cost:
   £0.013 million / $0.054 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 13 tons, 4.9 %
   Hull, fittings & equipment: 177 tons, 66.3 %
   Fuel, ammunition & stores: 17 tons, 6.4 %
   Miscellaneous weights: 60 tons, 22.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     194 lbs / 88 Kg = 1.8 x 6 " / 152 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.02
   Metacentric height 0.2 ft / 0.1 m
   Roll period: 10.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 0 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 0.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.649
   Length to Beam Ratio: 12.50 : 1
   'Natural speed' for length: 12.25 kts
   Power going to wave formation at top speed: 40 %
   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:      0.00 ft / 0.00 m
      - Forecastle (20 %):   0.00 ft / 0.00 m
      - Mid (50 %):      0.00 ft / 0.00 m
      - Quarterdeck (15 %):   0.00 ft / 0.00 m
      - Stern:      0.00 ft / 0.00 m
      - Average freeboard:   0.00 ft / 0.00 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 69.4 %
      - Above water (accommodation/working, high = better): 0.0 %
   Waterplane Area: 1,358 Square feet or 126 Square metres
   Displacement factor (Displacement / loading): 310 %
   Structure weight / hull surface area: 87 lbs/sq ft or 424 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 5.25
      - Longitudinal: 1.60
      - Overall: 2.16
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is extremely poor
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability

25t Long-Range Wireless
4t Torpedoes
31t Ballast Tanks

Ships:
F2-5     1914
F6-9     1915
F10-17 1917

[Logi]

Model 1905 (1900/250t)
Enlarged 300t version of the previous, with gasoline engines
2 bow tubes, 4 TT, 750nm@8kts, speed 12(8)kts
8 total - D3 to D10

Brought from Orange

[Logi]

F18 Submarine

L x B x D:  150 ft x 12 ft x 8 ft  
Displacement:   219 t / 250 t
Engine: One Diesel Engine
Propellers:   1  
Speed surf/subm:   12 kts / 10 kts  
Range surf/subm:   2000 nm at 8 kts / 40 nm at 5 kts  
Diving depth:   150 m  
Complement:   8-10
Torpedo tubes:   2 x 18" bow
Torpedo type:   1908 21" Imp. Wet Heater, 100kg warhead - 1 t each  
Armament:   4 torpedoes  
Guns: None
Other: Long-Range Wireless (25t)

Ships:
F18-25 1918
F26-33 1919