Riverine Craft

[The Rock Doctor]

Whatever they may be...

[The Rock Doctor]

R-1 Class River Gunboat

A generic river gunboat for service on the Danube/Sava, Euphrates/Tigris, and Nile river systems.  It's primarily intended to keep locals in line, so the armament is not super crazy.  The armor protection is basically intended to keep bullets out of the important bits.

Seakeeping is not great, but ought to be just fine for rivers. 

The main gun is a howitzer, to facilitate shelling forts or elevated positions as might be found on river banks.

The miscellaneous weight was originally for deck cargo or a small detachment of troops.

R-1, laid down 1893
R-2, laid down 1893
R-3, laid down 1893
R-4, laid down 1893
R-5, laid down 1893
R-6, laid down 1893
R-7, laid down 1894
R-8, laid down 1895
R-9, laid down 1895
R-10, laid down 1895
R-11, laid down 1895
R-12, laid down 1895
R-13, laid down 1895
R-14, laid down 1895

Enter ship name, Enter country Enter ship type laid down 1890

Displacement:
   250 t light; 260 t standard; 278 t normal; 293 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (191.60 ft / 188.32 ft) x 26.25 ft x (3.28 / 3.42 ft)
   (58.40 m / 57.40 m) x 8.00 m  x (1.00 / 1.04 m)

Armament:
      1 - 3.03" / 77.0 mm 15.0 cal gun - 12.34lbs / 5.60kg shells, 250 per gun
     Breech loading gun in deck mount, 1890 Model
     1 x Single mount on centreline, aft deck centre
      2 - 1.97" / 50.0 mm 40.0 cal guns - 3.66lbs / 1.66kg shells, 400 per gun
     Quick firing guns in deck mounts, 1890 Model
     2 x Single mounts on centreline, evenly spread
      4 - 0.31" / 8.0 mm 45.0 cal guns - 0.02lbs / 0.01kg shells, 15,000 per gun
     Machine guns in deck mounts, 1890 Model
     4 x Single mounts on sides, aft deck forward
      Weight of broadside 20 lbs / 9 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   0.59" / 15 mm   126.31 ft / 38.50 m   6.14 ft / 1.87 m
   Ends:   Unarmoured
     Main Belt covers 103 % of normal length

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

   - Box over machinery & magazines:
   0.39" / 10 mm

   - Conning towers: Forward 0.59" / 15 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 134 ihp / 100 Kw = 8.90 kts
   Range 1,300nm at 8.00 kts
   Bunker at max displacement = 33 tons (100% coal)

Complement:
   33 - 44

Cost:
   £0.013 million / $0.052 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.8 %
      - Guns: 2 tons, 0.8 %
   Armour: 26 tons, 9.5 %
      - Belts: 19 tons, 7.0 %
      - Armament: 3 tons, 0.9 %
      - Armour Deck: 4 tons, 1.3 %
      - Conning Tower: 1 tons, 0.2 %
   Machinery: 26 tons, 9.3 %
   Hull, fittings & equipment: 149 tons, 53.8 %
   Fuel, ammunition & stores: 28 tons, 10.1 %
   Miscellaneous weights: 46 tons, 16.5 %
      - On freeboard deck: 46 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,279 lbs / 580 Kg = 91.8 x 3.0 " / 77 mm shells or 1.6 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 11.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.03
   Seaboat quality  (Average = 1.00): 0.91

Hull form characteristics:
   Hull has raised forecastle,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.605
   Length to Beam Ratio: 7.18 : 1
   'Natural speed' for length: 13.72 kts
   Power going to wave formation at top speed: 21 %
   Trim (Max stability = 0, Max steadiness = 100): 77
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Forward deck:   20.00 %,  5.25 ft / 1.60 m,  5.25 ft / 1.60 m
      - Aft deck:   50.00 %,  5.25 ft / 1.60 m,  5.25 ft / 1.60 m
      - Quarter deck:   15.00 %,  5.25 ft / 1.60 m,  5.25 ft / 1.60 m
      - Average freeboard:      5.69 ft / 1.74 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 35.3 %
      - Above water (accommodation/working, high = better): 109.5 %
   Waterplane Area: 3,615 Square feet or 336 Square metres
   Displacement factor (Displacement / loading): 214 %
   Structure weight / hull surface area: 35 lbs/sq ft or 169 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.20
      - Longitudinal: 0.94
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[The Rock Doctor]

R-15 Class River Gunboat

A larger class of riverboat, built for movement of troops or supplies along riverways. 

R-15, laid down 1898
R-16, laid down 1898
R-17, laid down 1898
R-18, laid down 1898
R-19, laid down 1898
R-20, laid down 1898
R-21, laid down 1898
R-22, laid down 1898

Enter ship name, Enter country Enter ship type laid down 1898

Displacement:
   506 t light; 519 t standard; 539 t normal; 556 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (216.54 ft / 213.25 ft) x 36.09 ft x (3.77 / 3.87 ft)
   (66.00 m / 65.00 m) x 11.00 m  x (1.15 / 1.18 m)

Armament:
      2 - 1.97" / 50.0 mm 40.0 cal guns - 3.66lbs / 1.66kg shells, 400 per gun
     Quick firing guns in deck mounts, 1898 Model
     2 x Single mounts on centreline, evenly spread
      4 - 0.31" / 8.0 mm 45.0 cal guns - 0.02lbs / 0.01kg shells, 15,000 per gun
     Machine guns in deck mounts, 1898 Model
     4 x Single mounts on sides, aft deck forward
      Weight of broadside 7 lbs / 3 kg

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

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 161 ihp / 120 Kw = 8.20 kts
   Range 1,000nm at 8.00 kts
   Bunker at max displacement = 37 tons (100% coal)

Complement:
   55 - 72

Cost:
   £0.022 million / $0.087 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.3 %
      - Guns: 2 tons, 0.3 %
   Armour: 2 tons, 0.3 %
      - Armament: 2 tons, 0.3 %
   Machinery: 26 tons, 4.8 %
   Hull, fittings & equipment: 276 tons, 51.3 %
   Fuel, ammunition & stores: 33 tons, 6.2 %
   Miscellaneous weights: 200 tons, 37.1 %
      - On freeboard deck: 200 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     7,773 lbs / 3,526 Kg = 220.1 x 6 " / 152 mm shells or 5.3 torpedoes
   Stability (Unstable if below 1.00): 1.31
   Metacentric height 1.8 ft / 0.5 m
   Roll period: 11.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
   Hull has low forecastle, low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.650 / 0.653
   Length to Beam Ratio: 5.91 : 1
   'Natural speed' for length: 14.60 kts
   Power going to wave formation at top speed: 17 %
   Trim (Max stability = 0, Max steadiness = 100): 63
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.00 %,  5.91 ft / 1.80 m,  3.94 ft / 1.20 m
      - Forward deck:   20.00 %,  11.81 ft / 3.60 m,  11.81 ft / 3.60 m
      - Aft deck:   35.00 %,  11.81 ft / 3.60 m,  11.81 ft / 3.60 m
      - Quarter deck:   30.00 %,  3.94 ft / 1.20 m,  3.94 ft / 1.20 m
      - Average freeboard:      8.39 ft / 2.56 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 18.6 %
      - Above water (accommodation/working, high = better): 241.2 %
   Waterplane Area: 5,896 Square feet or 548 Square metres
   Displacement factor (Displacement / loading): 209 %
   Structure weight / hull surface area: 39 lbs/sq ft or 192 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.39
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[The Rock Doctor]

R-23 Class River Monitor

Two river monitors were built to defend the Ottomans' Balkan river system from Austrian forces.  The second unit had scarcely been laid down when Austria-Hungary imploded and got gobbled up by Germany.  One can only hope this pattern repeats itself.

R-23, laid down 1900
R-24, laid down 1900

Enter ship name, Enter country Enter ship type laid down 1900

Displacement:
   431 t light; 452 t standard; 469 t normal; 483 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (196.85 ft / 196.85 ft) x 29.20 ft x (4.27 / 4.37 ft)
   (60.00 m / 60.00 m) x 8.90 m  x (1.30 / 1.33 m)

Armament:
      3 - 3.46" / 88.0 mm 40.0 cal guns - 19.93lbs / 9.04kg shells, 250 per gun
     Breech loading guns in Coles/Ericsson turret mounts, 1900 Model
     2 x Single mounts on sides, forward deck forward
     1 x Single mount on centreline, aft deck aft
      1 - 3.03" / 77.0 mm 15.0 cal gun - 12.35lbs / 5.60kg shells, 200 per gun
     Breech loading gun in Coles/Ericsson turret mount, 1900 Model
     1 x Single mount on centreline, aft deck forward
      2 - 1.97" / 50.0 mm 40.0 cal guns - 3.66lbs / 1.66kg shells, 500 per gun
     Quick firing guns in deck mounts, 1900 Model
     2 x Single mounts on centreline, evenly spread
      2 raised mounts
      2 - 0.31" / 8.0 mm 45.0 cal guns - 0.02lbs / 0.01kg shells, 15,000 per gun
     Machine guns in deck mounts, 1900 Model
     2 x Single mounts on sides amidships
      Weight of broadside 79 lbs / 36 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.97" / 50 mm   127.95 ft / 39.00 m   6.53 ft / 1.99 m
   Ends:   0.59" / 15 mm     68.86 ft / 20.99 m   6.53 ft / 1.99 m
   Upper:   0.59" / 15 mm   127.95 ft / 39.00 m   3.28 ft / 1.00 m
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.95" / 75 mm   0.98" / 25 mm            -
   2nd:   2.95" / 75 mm   0.98" / 25 mm            -
   3rd:   0.39" / 10 mm         -               -
   4th:   0.39" / 10 mm         -               -

   - Box over machinery & magazines:
   0.79" / 20 mm

   - Conning towers: Forward 2.95" / 75 mm, Aft 2.95" / 75 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 268 ihp / 200 Kw = 10.02 kts
   Range 1,000nm at 8.00 kts
   Bunker at max displacement = 31 tons (100% coal)

Complement:
   49 - 65

Cost:
   £0.027 million / $0.108 million

Distribution of weights at normal displacement:
   Armament: 19 tons, 4.0 %
      - Guns: 19 tons, 4.0 %
   Armour: 147 tons, 31.4 %
      - Belts: 92 tons, 19.7 %
      - Armament: 38 tons, 8.1 %
      - Armour Deck: 9 tons, 1.9 %
      - Conning Towers: 8 tons, 1.6 %
   Machinery: 42 tons, 8.9 %
   Hull, fittings & equipment: 202 tons, 43.0 %
   Fuel, ammunition & stores: 38 tons, 8.2 %
   Miscellaneous weights: 21 tons, 4.5 %
      - Hull above water: 11 tons
      - On freeboard deck: 10 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,520 lbs / 689 Kg = 73.1 x 3.5 " / 88 mm shells or 1.3 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 77 %
         - Recoil effect (Restricted arc if above 1.00): 0.18
   Seaboat quality  (Average = 1.00): 0.99

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.670 / 0.673
   Length to Beam Ratio: 6.74 : 1
   'Natural speed' for length: 14.03 kts
   Power going to wave formation at top speed: 27 %
   Trim (Max stability = 0, Max steadiness = 100): 78
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Forward deck:   20.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Aft deck:   50.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Quarter deck:   15.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Average freeboard:      6.56 ft / 2.00 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 46.3 %
      - Above water (accommodation/working, high = better): 114.4 %
   Waterplane Area: 4,484 Square feet or 417 Square metres
   Displacement factor (Displacement / loading): 152 %
   Structure weight / hull surface area: 39 lbs/sq ft or 189 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.02
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[The Rock Doctor]

R-25 Class Gunboat

And with the planned Nile Expedition being launched in 1901, the Ottomans are going to add at least a couple more cargo-carrying riverboats to aid with logistics.  These are mildly-tweaked variants on the R-15 class - primarily a minor hair cut to reduce building time.

R-25, laid down 1901
R-32, laid down 1901
R-33, laid down 1902
R-34, laid down 1902
R-35, laid down 1903

Enter ship name, Enter country Enter ship type laid down 1900

Displacement:
   499 t light; 511 t standard; 531 t normal; 547 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (216.54 ft / 213.25 ft) x 36.09 ft x (3.77 / 3.87 ft)
   (66.00 m / 65.00 m) x 11.00 m  x (1.15 / 1.18 m)

Armament:
      2 - 1.97" / 50.0 mm 40.0 cal guns - 3.66lbs / 1.66kg shells, 400 per gun
     Quick firing guns in deck mounts, 1900 Model
     2 x Single mounts on centreline, evenly spread
      4 - 0.31" / 8.0 mm 15.0 cal guns - 0.01lbs / 0.01kg shells, 15,000 per gun
     Machine guns in deck mounts, 1900 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 7 lbs / 3 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm         -               -
   2nd:   0.20" / 5 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 161 ihp / 120 Kw = 8.22 kts
   Range 1,000nm at 8.00 kts
   Bunker at max displacement = 35 tons (100% coal)

Complement:
   54 - 71

Cost:
   £0.021 million / $0.085 million

Distribution of weights at normal displacement:
   Armament: 1 tons, 0.3 %
      - Guns: 1 tons, 0.3 %
   Armour: 4 tons, 0.7 %
      - Armament: 4 tons, 0.7 %
   Machinery: 25 tons, 4.7 %
   Hull, fittings & equipment: 268 tons, 50.5 %
   Fuel, ammunition & stores: 32 tons, 6.1 %
   Miscellaneous weights: 200 tons, 37.7 %
      - Hull above water: 100 tons
      - On freeboard deck: 100 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,806 lbs / 1,726 Kg = 997.8 x 2.0 " / 50 mm shells or 2.1 torpedoes
   Stability (Unstable if below 1.00): 1.36
   Metacentric height 1.9 ft / 0.6 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
   Hull has low forecastle, low quarterdeck ,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.640 / 0.643
   Length to Beam Ratio: 5.91 : 1
   'Natural speed' for length: 14.60 kts
   Power going to wave formation at top speed: 17 %
   Trim (Max stability = 0, Max steadiness = 100): 63
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.00 %,  3.94 ft / 1.20 m,  3.94 ft / 1.20 m
      - Forward deck:   20.00 %,  11.81 ft / 3.60 m,  11.81 ft / 3.60 m
      - Aft deck:   35.00 %,  11.81 ft / 3.60 m,  11.81 ft / 3.60 m
      - Quarter deck:   30.00 %,  3.94 ft / 1.20 m,  3.94 ft / 1.20 m
      - Average freeboard:      8.27 ft / 2.52 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 38.2 %
      - Above water (accommodation/working, high = better): 243.4 %
   Waterplane Area: 5,842 Square feet or 543 Square metres
   Displacement factor (Displacement / loading): 206 %
   Structure weight / hull surface area: 38 lbs/sq ft or 188 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.37
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[The Rock Doctor]

R-26 Class Gunboat

Also to be built for the Nile Expedition - a group of very small gunboats for forward scouting, river mapping, and such. 

Given that the most likely "opposition" along the Upper Nile would be locals with rifles, four machine guns seemed likely a reasonably heavy armament for this purpose.  However, consultation with the Germans led to the conclusion that a single heavier gun might be useful for intimidation purposes.

The armor belt is basically a row of bullet-proof steel along enough of the hull to keep the boat from sinking.  Additional plates are added amidships to cover the vertical extent of the engine room.

R-26 to R-31, laid down 1901

Enter ship name, Enter country Enter ship type laid down 1900

Displacement:
   80 t light; 82 t standard; 89 t normal; 93 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (101.71 ft / 98.43 ft) x 21.33 ft x (2.46 / 2.57 ft)
   (31.00 m / 30.00 m) x 6.50 m  x (0.75 / 0.78 m)

Armament:
      1 - 1.97" / 50.0 mm 40.0 cal gun - 3.66lbs / 1.66kg shells, 400 per gun
     Quick firing gun in deck mount, 1900 Model
     1 x Single mount on centreline, forward deck centre
      3 - 0.31" / 8.0 mm 40.0 cal guns - 0.01lbs / 0.00kg shells, 15,000 per gun
     Machine guns in deck mounts, 1900 Model
     1 x Single mount on centreline amidships (aft deck)
     2 x Single mounts on sides amidships
      Weight of broadside 4 lbs / 2 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   0.59" / 15 mm     26.25 ft / 8.00 m   7.22 ft / 2.20 m
   Ends:   0.59" / 15 mm     49.21 ft / 15.00 m   2.62 ft / 0.80 m
     22.97 ft / 7.00 m Unarmoured ends
     Main Belt covers 41 % of normal length

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

   - Conning towers: Forward 0.59" / 15 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 54 ihp / 40 Kw = 8.21 kts
   Range 1,000nm at 8.00 kts
   Bunker at max displacement = 11 tons (100% coal)

Complement:
   13 - 18

Cost:
   £0.004 million / $0.017 million

Distribution of weights at normal displacement:
   Armament: 1 tons, 0.9 %
      - Guns: 1 tons, 0.9 %
   Armour: 16 tons, 17.9 %
      - Belts: 10 tons, 11.4 %
      - Armament: 6 tons, 6.2 %
      - Conning Tower: 0 tons, 0.3 %
   Machinery: 8 tons, 9.6 %
   Hull, fittings & equipment: 38 tons, 43.4 %
   Fuel, ammunition & stores: 9 tons, 10.2 %
   Miscellaneous weights: 16 tons, 18.1 %
      - On freeboard deck: 11 tons
      - Above deck: 5 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     487 lbs / 221 Kg = 127.7 x 2.0 " / 50 mm shells or 1.0 torpedoes
   Stability (Unstable if below 1.00): 1.32
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 10.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 1.38

Hull form characteristics:
   Hull has raised forecastle,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.600 / 0.606
   Length to Beam Ratio: 4.62 : 1
   'Natural speed' for length: 9.92 kts
   Power going to wave formation at top speed: 35 %
   Trim (Max stability = 0, Max steadiness = 100): 79
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Forward deck:   20.00 %,  4.92 ft / 1.50 m,  4.92 ft / 1.50 m
      - Aft deck:   30.00 %,  4.92 ft / 1.50 m,  4.92 ft / 1.50 m
      - Quarter deck:   30.00 %,  4.92 ft / 1.50 m,  4.92 ft / 1.50 m
      - Average freeboard:      5.51 ft / 1.68 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 35.9 %
      - Above water (accommodation/working, high = better): 110.7 %
   Waterplane Area: 1,535 Square feet or 143 Square metres
   Displacement factor (Displacement / loading): 174 %
   Structure weight / hull surface area: 20 lbs/sq ft or 99 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.20
      - Overall: 1.01
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily