NUS Riverine craft

[Sachmle]

Wooden built river patrol craft.

Image based on parts by Wes Wilson, modified by me.

R-100 Class, NUS River Patrolboat laid down 1913 (Engine 1912)

Displacement:
   200 t light; 206 t standard; 231 t normal; 251 t full load

Dimensions: Length overall / water x beam x draught
   206.00 ft / 203.00 ft x 20.50 ft x 4.67 ft (normal load)
   62.79 m / 61.87 m x 6.25 m  x 1.42 m

Armament:
      1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1905 Model
     Quick firing gun in deck mount
     on centreline forward, 1 raised gun
      4 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1905 Model
     Machine guns in deck mounts
     on side, all amidships
      1 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1905 Model
     Machine gun in deck mount
     on centreline aft
      2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1905 Model
     Machine guns in deck mounts
     on side, all forward
   Weight of broadside 16 lbs / 7 kg
   Shells per gun, main battery: 100

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 1 shaft, 1,615 shp / 1,205 Kw = 19.33 kts
   Range 2,150nm at 10.00 kts
   Bunker at max displacement = 45 tons (100% coal)

Complement:
   29 - 38

Cost:
   £0.020 million / $0.081 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.8 %
   Machinery: 71 tons, 30.7 %
   Hull, fittings & equipment: 118 tons, 50.9 %
   Fuel, ammunition & stores: 31 tons, 13.2 %
   Miscellaneous weights: 10 tons, 4.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     357 lbs / 162 Kg = 26.4 x 3.0 " / 76 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 10.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.09
   Seaboat quality  (Average = 1.00): 1.43

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.416
   Length to Beam Ratio: 9.90 : 1
   'Natural speed' for length: 14.25 kts
   Power going to wave formation at top speed: 51 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   Bow angle (Positive = bow angles forward): 14.05 degrees
   Stern overhang: 1.00 ft / 0.30 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      8.00 ft / 2.44 m
      - Forecastle (20 %):   8.00 ft / 2.44 m
      - Mid (50 %):      8.00 ft / 2.44 m
      - Quarterdeck (15 %):   8.00 ft / 2.44 m
      - Stern:      8.00 ft / 2.44 m
      - Average freeboard:   8.00 ft / 2.44 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 110.8 %
      - Above water (accommodation/working, high = better): 128.8 %
   Waterplane Area: 2,452 Square feet or 228 Square metres
   Displacement factor (Displacement / loading): 138 %
   Structure weight / hull surface area: 27 lbs/sq ft or 134 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.05
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily
__________________________________________________________________

Steel hulled River monitor

Image based on parts by Wes Wilson, modified by me.

R-200 Class, NUS River Monitor laid down 1913 (Engine 1912)

Displacement:
   600 t light; 627 t standard; 651 t normal; 670 t full load

Dimensions: Length overall / water x beam x draught
   231.00 ft / 228.00 ft x 28.00 ft x 6.50 ft (normal load)
   70.41 m / 69.49 m x 8.53 m  x 1.98 m

Armament:
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
     Quick firing guns in deck mounts with hoists
     on centreline ends, evenly spread
      2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1905 Model
     Quick firing guns in deck mounts
     on side, all amidships
      2 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1905 Model
     Machine guns in deck mounts
     on side, all forward
   Weight of broadside 92 lbs / 42 kg
   Shells per gun, main battery: 250

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.00" / 51 mm   140.00 ft / 42.67 m   12.00 ft / 3.66 m
   Ends:   Unarmoured
     Main Belt covers 94 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.00" / 102 mm   2.00" / 51 mm      1.00" / 25 mm

   - Armour deck: 1.00" / 25 mm, Conning tower: 4.00" / 102 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 1 shaft, 1,533 shp / 1,143 Kw = 16.00 kts
   Range 1,000nm at 10.00 kts
   Bunker at max displacement = 43 tons (100% coal)

Complement:
   63 - 83

Cost:
   £0.044 million / $0.175 million

Distribution of weights at normal displacement:
   Armament: 12 tons, 1.8 %
   Armour: 247 tons, 37.9 %
      - Belts: 144 tons, 22.2 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 16 tons, 2.5 %
      - Armour Deck: 80 tons, 12.3 %
      - Conning Tower: 6 tons, 1.0 %
   Machinery: 67 tons, 10.3 %
   Hull, fittings & equipment: 249 tons, 38.3 %
   Fuel, ammunition & stores: 51 tons, 7.9 %
   Miscellaneous weights: 25 tons, 3.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,704 lbs / 773 Kg = 53.3 x 4.0 " / 102 mm shells or 1.2 torpedoes
   Stability (Unstable if below 1.00): 1.25
   Metacentric height 1.1 ft / 0.3 m
   Roll period: 11.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.21
   Seaboat quality  (Average = 1.00): 1.39

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.549
   Length to Beam Ratio: 8.14 : 1
   'Natural speed' for length: 15.10 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   Bow angle (Positive = bow angles forward): 14.05 degrees
   Stern overhang: 1.00 ft / 0.30 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      8.00 ft / 2.44 m
      - Forecastle (20 %):   8.00 ft / 2.44 m
      - Mid (50 %):      8.00 ft / 2.44 m
      - Quarterdeck (15 %):   8.00 ft / 2.44 m
      - Stern:      8.00 ft / 2.44 m
      - Average freeboard:   8.00 ft / 2.44 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 53.5 %
      - Above water (accommodation/working, high = better): 104.4 %
   Waterplane Area: 4,316 Square feet or 401 Square metres
   Displacement factor (Displacement / loading): 131 %
   Structure weight / hull surface area: 40 lbs/sq ft or 195 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.27
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[The Rock Doctor]

In general, I like them and think a few would be a good investment.  They are perhaps faster than necessary, but that's your call.  I'd consider ~15 knots to be fast for a river boat.

On R-100, I'd suggest considering a single small howitzer in place of some of the several machine guns, to give an indirect fire capability.  Similar weapons might replace the 76.2 mm on the R-200 (or not, if you just want a river "battleship".

Adding some additional superstructure on both types might be good, as the freeboard and draught only allow for one full-height deck. 

[Jefgte]

19kts are too much for a river Boat.

Because of damages on the banks,10 to 12 kts are enough.


Jef  ;)

[Borys]

Ahoj!
The rivers there might have strong currents. And are big - so speed can be useful, even if unecessary.
Camping out on the deck may not be the best idea in those mosqito infested areas, so I agree with the comment on superstructure.
And the howitzer too.
Borys

[Sachmle]

If slowed to 15 knots would 1 stack be sufficient? If so I'll add superstructure in that area. As to the howitzer v. machine guns the idea was to be able to put down a withering fire across the banks if ground forces are nearby, and use HE rounds from the 3" for things needed more "oomph" to get rid of.

[Borys]

Ahoj!
After some thought, a howitzer might be too advanced thinking. A QF 3" firing shrapnel is a wall of fire!
Borys

[Sachmle]

How's this look?

Image based on parts by Wes Wilson, modified by me.


R-100, NUS River Patrolboat laid down 1913 (Engine 1912)

Displacement:
   200 t light; 207 t standard; 256 t normal; 295 t full load

Dimensions: Length overall / water x beam x draught
   215.00 ft / 212.00 ft x 20.75 ft x 5.00 ft (normal load)
   65.53 m / 64.62 m x 6.32 m  x 1.52 m

Armament:
      1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1906 Model
     Quick firing gun in deck mount
     on centreline forward
      4 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1905 Model
     Machine guns in deck mounts
     on side, all amidships
      2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1906 Model
     Machine guns in deck mounts
     on side, all forward
      1 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1906 Model
     Machine gun in deck mount
     on centreline aft
   Weight of broadside 16 lbs / 7 kg
   Shells per gun, main battery: 150

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 1 shaft, 648 ihp / 483 Kw = 15.00 kts
   Range 2,500nm at 12.00 kts
   Bunker at max displacement = 88 tons (100% coal)

Complement:
   31 - 41

Cost:
   £0.016 million / $0.064 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.8 %
   Machinery: 43 tons, 16.8 %
   Hull, fittings & equipment: 145 tons, 56.8 %
   Fuel, ammunition & stores: 56 tons, 21.8 %
   Miscellaneous weights: 10 tons, 3.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     812 lbs / 368 Kg = 60.2 x 3.0 " / 76 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.17
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 10.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.09
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.407
   Length to Beam Ratio: 10.22 : 1
   'Natural speed' for length: 14.56 kts
   Power going to wave formation at top speed: 36 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 16.70 degrees
   Stern overhang: -2.00 ft / -0.61 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      10.00 ft / 3.05 m
      - Forecastle (20 %):   10.00 ft / 3.05 m
      - Mid (50 %):      10.00 ft / 3.05 m
      - Quarterdeck (15 %):   10.00 ft / 3.05 m
      - Stern:      10.00 ft / 3.05 m
      - Average freeboard:   10.00 ft / 3.05 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 65.8 %
      - Above water (accommodation/working, high = better): 158.2 %
   Waterplane Area: 2,574 Square feet or 239 Square metres
   Displacement factor (Displacement / loading): 229 %
   Structure weight / hull surface area: 26 lbs/sq ft or 129 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.85
      - Longitudinal: 4.05
      - 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

Oops.... posted wrong SS w/ the new pic. Updated to correct SS report.