Gunboats

[Desertfox]

Nesher
Kurnass

Nesher class, New Zion (ex-Cairo) Gunboats laid down 1883

Two on Lake Victoria

Displacement:
178 t light; 188 t standard; 200 t normal; 209 t full load

Dimensions: Length overall / water x beam x draught
150.00 ft / 150.00 ft x 30.00 ft x 3.00 ft (normal load)
45.72 m / 45.72 m x 9.14 m x 0.91 m

Armament:
6 - 3.00" / 76.2 mm guns in single mounts, 12.08lbs / 5.48kg shells, 1883 Model
Quick firing guns in deck mounts
on side, evenly spread
16 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1893 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 73 lbs / 33 kg
Shells per gun, main battery: 150

Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 2 shafts, 178 ihp / 133 Kw = 10.00 kts
Range 1,500nm at 6.00 kts
Bunker at max displacement = 21 tons (100% coal)

Complement:
26 - 34

Cost:
£0.019 million / $0.076 million

Distribution of weights at normal displacement:
Armament: 9 tons, 4.6 %
Machinery: 35 tons, 17.7 %
Hull, fittings & equipment: 123 tons, 61.7 %
Fuel, ammunition & stores: 22 tons, 11.0 %
Miscellaneous weights: 10 tons, 5.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
377 lbs / 171 Kg = 31.2 x 3.0 " / 76 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.72
Metacentric height 2.0 ft / 0.6 m
Roll period: 8.9 seconds
Steadiness - As gun platform (Average = 50 %): 45 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 0.80

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.519
Length to Beam Ratio: 5.00 : 1
'Natural speed' for length: 12.25 kts
Power going to wave formation at top speed: 32 %
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: 5.00 ft / 1.52 m
- Forecastle (20 %): 5.00 ft / 1.52 m
- Mid (50 %): 5.00 ft / 1.52 m
- Quarterdeck (15 %): 5.00 ft / 1.52 m
- Stern: 5.00 ft / 1.52 m
- Average freeboard: 5.00 ft / 1.52 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 98.5 %
- Above water (accommodation/working, high = better): 111.7 %
Waterplane Area: 3,050 Square feet or 283 Square metres
Displacement factor (Displacement / loading): 130 %
Structure weight / hull surface area: 36 lbs/sq ft or 177 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.24
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[Desertfox]

Netz
Ra'am

G1 class, New Zion (ex-NS, ex-ACM) Gunboat laid down 1892 (Engine 1905)

Displacement:
   230 t light; 246 t standard; 269 t normal; 288 t full load

Dimensions: Length overall / water x beam x draught
   210.00 ft / 210.00 ft x 22.00 ft x 4.10 ft (normal load)
   64.01 m / 64.01 m x 6.71 m  x 1.25 m

Armament:
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1901 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1901 Model
     Quick firing guns in deck mounts
     on centreline, evenly spread
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1901 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 68 lbs / 31 kg
   Shells per gun, main battery: 250

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 1 shaft, 2,601 shp / 1,940 Kw = 21.00 kts
   Range 1,200nm at 10.00 kts
   Bunker at max displacement = 42 tons (100% coal)

Complement:
   33 - 43

Cost:
   £0.033 million / $0.131 million

Distribution of weights at normal displacement:
   Armament: 9 tons, 3.2 %
   Machinery: 125 tons, 46.6 %
   Hull, fittings & equipment: 97 tons, 35.9 %
   Fuel, ammunition & stores: 39 tons, 14.4 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     110 lbs / 50 Kg = 3.4 x 4.0 " / 102 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.45
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 9.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.22
   Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.497
   Length to Beam Ratio: 9.55 : 1
   'Natural speed' for length: 14.49 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 55
   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:      14.00 ft / 4.27 m
      - Forecastle (20 %):   9.00 ft / 2.74 m
      - Mid (50 %):      9.00 ft / 2.74 m
      - Quarterdeck (15 %):   8.00 ft / 2.44 m
      - Stern:      8.00 ft / 2.44 m
      - Average freeboard:   9.08 ft / 2.77 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 176.2 %
      - Above water (accommodation/working, high = better): 148.6 %
   Waterplane Area: 2,949 Square feet or 274 Square metres
   Displacement factor (Displacement / loading): 54 %
   Structure weight / hull surface area: 19 lbs/sq ft or 92 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.51
      - Longitudinal: 1.50
      - Overall: 0.57
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily