Prussian ships

[KWorld]

The first ironclad acquired by the Prussian navy, from Samuda Brothers of the UK.

SMS Arminius, Prussia Ironclad laid down 1870

Displacement:
   1,637 t light; 1,709 t standard; 1,854 t normal; 1,970 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (210.30 ft / 202.10 ft) x 35.76 ft x (14.60 / 15.36 ft)
   (64.10 m / 61.60 m) x 10.90 m  x (4.45 / 4.68 m)

Armament:
      4 - 8.27" / 210 mm 19.0 cal guns - 187.39lbs / 85.00kg shells, 85 per gun
     Breech loading guns in Coles/Ericsson turret mounts, 1870 Model
     1 x Twin mount on centreline, forward deck aft
     1 x Twin mount on centreline, aft deck forward
      Weight of broadside 750 lbs / 340 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.50" / 114 mm   124.44 ft / 37.93 m   7.38 ft / 2.25 m
   Ends:   4.50" / 114 mm     40.35 ft / 12.30 m   7.38 ft / 2.25 m
     37.30 ft / 11.37 m Unarmoured ends
   Upper:   4.50" / 114 mm   124.44 ft / 37.93 m   6.00 ft / 1.83 m
     Main Belt covers 95 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.00" / 127 mm   4.00" / 102 mm            -

   - Protected deck - single deck:
   For and Aft decks: 1.00" / 25 mm

   - Conning towers: Forward 5.00" / 127 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 633 ihp / 472 Kw = 10.00 kts
   Range 2,000nm at 8.00 kts
   Bunker at max displacement = 260 tons (100% coal)

Complement:
   140 - 183

Cost:
   £0.112 million / $0.450 million

Distribution of weights at normal displacement:
   Armament: 80 tons, 4.3 %
      - Guns: 80 tons, 4.3 %
   Armour: 569 tons, 30.7 %
      - Belts: 389 tons, 21.0 %
      - Armament: 87 tons, 4.7 %
      - Armour Deck: 77 tons, 4.2 %
      - Conning Tower: 16 tons, 0.9 %
   Machinery: 155 tons, 8.4 %
   Hull, fittings & equipment: 685 tons, 36.9 %
   Fuel, ammunition & stores: 217 tons, 11.7 %
   Miscellaneous weights: 148 tons, 8.0 %
      - Above deck: 148 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,339 lbs / 1,061 Kg = 11.8 x 8.3 " / 210 mm shells or 1.6 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 12.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 43 %
         - Recoil effect (Restricted arc if above 1.00): 0.40
   Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.615 / 0.621
   Length to Beam Ratio: 5.65 : 1
   'Natural speed' for length: 14.22 kts
   Power going to wave formation at top speed: 34 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   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:   20.00 %,  9.50 ft / 2.90 m,  8.50 ft / 2.59 m
      - Forward deck:   30.00 %,  6.00 ft / 1.83 m,  6.00 ft / 1.83 m
      - Aft deck:   30.00 %,  6.00 ft / 1.83 m,  6.00 ft / 1.83 m
      - Quarter deck:   20.00 %,  6.00 ft / 1.83 m,  6.00 ft / 1.83 m
      - Average freeboard:      6.58 ft / 2.01 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 45.5 %
      - Above water (accommodation/working, high = better): 43.8 %
   Waterplane Area: 5,360 Square feet or 498 Square metres
   Displacement factor (Displacement / loading): 138 %
   Structure weight / hull surface area: 93 lbs/sq ft or 454 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.26
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room

Above-water miscellaneous weight is masts and sails allowing a speed of up to 10 knots under normal conditions (8% normal displacement).

End armor is only on the bow, to support the ram.

[KWorld]

SMS Kronprinz, Prussia Ironclad Frigate laid down 1870
Armoured Frigate (Broadside ironclad)

Displacement:
   4,661 t light; 4,947 t standard; 5,681 t normal; 6,268 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (299.21 ft / 289.37 ft) x 49.87 ft x (22.97 / 24.91 ft)
   (91.20 m / 88.20 m) x 15.20 m  x (7.00 / 7.59 m)

Armament:
      14 - 8.27" / 210 mm 19.0 cal guns - 187.39lbs / 85.00kg shells, 100 per gun
     Breech loading guns in broadside mounts, 1870 Model
     14 x Single mounts on sides, evenly spread
      14 hull mounts on upper deck- Limited use in all but light seas
      2 - 8.27" / 210 mm 22.0 cal guns - 187.39lbs / 85.00kg shells, 128 per gun
     Breech loading guns in casemate mounts, 1870 Model
     2 x Single mounts on sides, forward deck forward
      Weight of broadside 2,998 lbs / 1,360 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   5.00" / 127 mm   173.62 ft / 52.92 m   9.84 ft / 3.00 m
   Ends:   4.50" / 114 mm   115.72 ft / 35.27 m   13.12 ft / 4.00 m
   Upper:   5.00" / 127 mm   173.62 ft / 52.92 m   8.20 ft / 2.50 m
     Main Belt covers 92 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   2nd:   4.50" / 114 mm   0.47" / 12 mm            -

   - Protected deck - single deck:
   For and Aft decks: 1.00" / 25 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

   - Conning towers: Forward 5.98" / 152 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 3,953 ihp / 2,949 Kw = 14.00 kts
   Range 3,200nm at 10.00 kts
   Bunker at max displacement = 1,321 tons (100% coal)

Complement:
   326 - 425

Cost:
   £0.367 million / $1.469 million

Distribution of weights at normal displacement:
   Armament: 194 tons, 3.4 %
      - Guns: 194 tons, 3.4 %
   Armour: 1,224 tons, 21.5 %
      - Belts: 963 tons, 16.9 %
      - Armament: 24 tons, 0.4 %
      - Armour Deck: 197 tons, 3.5 %
      - Conning Tower: 41 tons, 0.7 %
   Machinery: 969 tons, 17.1 %
   Hull, fittings & equipment: 1,707 tons, 30.0 %
   Fuel, ammunition & stores: 1,020 tons, 18.0 %
   Miscellaneous weights: 568 tons, 10.0 %
      - Above deck: 568 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5,455 lbs / 2,474 Kg = 27.6 x 8.3 " / 210 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.25
   Metacentric height 2.7 ft / 0.8 m
   Roll period: 12.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 74 %
         - Recoil effect (Restricted arc if above 1.00): 0.30
   Seaboat quality  (Average = 1.00): 1.86

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.610
   Length to Beam Ratio: 5.80 : 1
   'Natural speed' for length: 17.01 kts
   Power going to wave formation at top speed: 42 %
   Trim (Max stability = 0, Max steadiness = 100): 40
   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:   20.00 %,  14.76 ft / 4.50 m,  13.12 ft / 4.00 m
      - Forward deck:   30.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Aft deck:   30.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Quarter deck:   20.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Average freeboard:      13.25 ft / 4.04 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 69.5 %
      - Above water (accommodation/working, high = better): 80.9 %
   Waterplane Area: 10,554 Square feet or 981 Square metres
   Displacement factor (Displacement / loading): 130 %
   Structure weight / hull surface area: 107 lbs/sq ft or 521 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.66
      - Overall: 1.02
   Excellent machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Above-water miscellaneous weight is masts and sails allowing a speed of up to 13.5 knots under normal conditions (10% normal displacement).

Secondary battery is bow-mounted chase guns, with 1 gun on either beam.

[KWorld]

SMS Konig Wilhelm, Prussia Ironclad Frigate laid down 1870
Armoured Frigate (Broadside ironclad)

Displacement:
   8,572 t light; 9,053 t standard; 9,705 t normal; 10,227 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (367.78 ft / 356.30 ft) x 60.04 ft x (26.25 / 27.43 ft)
   (112.10 m / 108.60 m) x 18.30 m  x (8.00 / 8.36 m)

Armament:
      18 - 9.45" / 240 mm 20.0 cal guns - 275.58lbs / 125.00kg shells, 80 per gun
     Breech loading guns in broadside mounts, 1870 Model
     18 x Single mounts on sides, evenly spread
      18 hull mounts on upper deck- Limited use in all but light seas
      5 - 8.27" / 210 mm 22.0 cal guns - 187.39lbs / 85.00kg shells, 128 per gun
     Breech loading guns in casemate mounts, 1870 Model
     4 x Single mounts on side ends, evenly spread
     1 x Single mount on centreline, aft deck aft
      1 hull mount in casemate- Limited use in all but light seas
      Weight of broadside 5,897 lbs / 2,675 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   19.0" / 483 mm   213.78 ft / 65.16 m   9.84 ft / 3.00 m
   Ends:   7.09" / 180 mm   142.49 ft / 43.43 m   13.12 ft / 4.00 m
   Upper:   7.09" / 180 mm   213.78 ft / 65.16 m   8.20 ft / 2.50 m
     Main Belt covers 92 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   2nd:   4.50" / 114 mm   0.47" / 12 mm            -

   - Protected deck - single deck:
   For and Aft decks: 1.00" / 25 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

   - Conning towers: Forward 5.98" / 152 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 5,230 ihp / 3,902 Kw = 14.00 kts
   Range 2,000nm at 10.00 kts
   Bunker at max displacement = 1,175 tons (100% coal)

Complement:
   488 - 635

Cost:
   £0.622 million / $2.489 million

Distribution of weights at normal displacement:
   Armament: 403 tons, 4.2 %
      - Guns: 403 tons, 4.2 %
   Armour: 3,261 tons, 33.6 %
      - Belts: 2,856 tons, 29.4 %
      - Armament: 59 tons, 0.6 %
      - Armour Deck: 287 tons, 3.0 %
      - Conning Tower: 59 tons, 0.6 %
   Machinery: 1,282 tons, 13.2 %
   Hull, fittings & equipment: 2,850 tons, 29.4 %
   Fuel, ammunition & stores: 1,134 tons, 11.7 %
   Miscellaneous weights: 776 tons, 8.0 %
      - Above deck: 776 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     8,626 lbs / 3,913 Kg = 29.2 x 9.4 " / 240 mm shells or 2.3 torpedoes
   Stability (Unstable if below 1.00): 1.29
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 13.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 34 %
         - Recoil effect (Restricted arc if above 1.00): 0.21
   Seaboat quality  (Average = 1.00): 0.59

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.605 / 0.610
   Length to Beam Ratio: 5.93 : 1
   'Natural speed' for length: 18.88 kts
   Power going to wave formation at top speed: 37 %
   Trim (Max stability = 0, Max steadiness = 100): 40
   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:   20.00 %,  14.76 ft / 4.50 m,  13.12 ft / 4.00 m
      - Forward deck:   30.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Aft deck:   30.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Quarter deck:   20.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Average freeboard:      13.25 ft / 4.04 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 59.4 %
      - Above water (accommodation/working, high = better): 78.8 %
   Waterplane Area: 15,388 Square feet or 1,430 Square metres
   Displacement factor (Displacement / loading): 122 %
   Structure weight / hull surface area: 140 lbs/sq ft or 683 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.04
      - Longitudinal: 1.47
      - Overall: 1.07
   Excellent machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Caution: Lacks seaworthiness - very limited seakeeping ability

Above-water miscellaneous weight is masts and sails allowing a speed of up to 12knots under normal conditions (8% normal displacement).

Secondary battery are chase guns, with 1 gun on either beam forward, 1 gun on either beam astern, and a 5th gun mounted directly in the stern of the ship.

[KWorld]

SMS Augusta, Prussia Corvette laid down 1870

Displacement:
   1,552 t light; 1,604 t standard; 1,781 t normal; 1,923 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (249.86 ft / 246.72 ft) x 36.42 ft x (14.76 / 15.61 ft)
   (76.16 m / 75.20 m) x 11.10 m  x (4.50 / 4.76 m)

Armament:
      8 - 5.31" / 135 mm 20.0 cal guns - 24.00lbs / 10.89kg shells, 100 per gun
     Muzzle loading guns in broadside mounts, 1870 Model
     8 x Single mounts on sides, evenly spread
      8 hull mounts on upper deck- Limited use in all but light seas
      6 - 4.02" / 102 mm 20.0 cal guns - 18.00lbs / 8.16kg shells, 100 per gun
     Muzzle loading guns in broadside mounts, 1870 Model
     6 x Single mounts on side ends, majority forward
      6 hull mounts on upper deck- Limited use in all but light seas
      Weight of broadside 300 lbs / 136 kg

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 1,708 ihp / 1,274 Kw = 13.50 kts
   Range 2,500nm at 8.00 kts
   Bunker at max displacement = 319 tons (100% coal)

Complement:
   136 - 178

Cost:
   £0.126 million / $0.502 million

Distribution of weights at normal displacement:
   Armament: 35 tons, 2.0 %
      - Guns: 35 tons, 2.0 %
   Machinery: 419 tons, 23.5 %
   Hull, fittings & equipment: 917 tons, 51.5 %
   Fuel, ammunition & stores: 229 tons, 12.9 %
   Miscellaneous weights: 181 tons, 10.2 %
      - Hull below water: 3 tons
      - Above deck: 178 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,913 lbs / 868 Kg = 36.4 x 5.3 " / 135 mm shells or 0.8 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 12.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - 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,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.470 / 0.480
   Length to Beam Ratio: 6.77 : 1
   'Natural speed' for length: 15.71 kts
   Power going to wave formation at top speed: 37 %
   Trim (Max stability = 0, Max steadiness = 100): 40
   Bow angle (Positive = bow angles forward): 12.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  14.76 ft / 4.50 m,  13.12 ft / 4.00 m
      - Forward deck:   30.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Aft deck:   30.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Quarter deck:   20.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Average freeboard:      13.25 ft / 4.04 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 84.1 %
      - Above water (accommodation/working, high = better): 107.1 %
   Waterplane Area: 5,829 Square feet or 541 Square metres
   Displacement factor (Displacement / loading): 156 %
   Structure weight / hull surface area: 90 lbs/sq ft or 438 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.13
      - Longitudinal: 4.43
      - Overall: 1.30
   Adequate machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather


Above-water miscellaneous weight is masts and sails allowing a speed of up to 12.5 knots under normal conditions (10% normal displacement).

Armament is entirely muzzleloading smoothbore weapons.

[KWorld]

SMS Ariadne, Prussian Corvette laid down 1870

Displacement:
   1,027 t light; 1,106 t standard; 1,188 t normal; 1,254 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (180.00 ft / 180.00 ft) x 35.00 ft x (12.00 / 12.54 ft)
   (54.86 m / 54.86 m) x 10.67 m  x (3.66 / 3.82 m)

Armament:
      2 - 8.27" / 210 mm 19.0 cal guns - 187.39lbs / 85.00kg shells, 100 per gun
     Breech loading guns in deck mounts, 1870 Model
     2 x Single mounts on centreline ends, evenly spread
      24 - 6.40" / 163 mm 12.0 cal guns - 32.00lbs / 14.51kg shells, 80 per gun
     Muzzle loading guns in broadside mounts, 1870 Model
     24 x Single mounts on sides, evenly spread
      14 hull mounts on upper deck- Limited use in any sea
      Weight of broadside 1,143 lbs / 518 kg

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 1,314 ihp / 980 Kw = 13.00 kts
   Range 2,000nm at 7.00 kts
   Bunker at max displacement = 148 tons (100% coal)

Complement:
   100 - 131

Cost:
   £0.118 million / $0.474 million

Distribution of weights at normal displacement:
   Armament: 106 tons, 8.9 %
      - Guns: 106 tons, 8.9 %
   Machinery: 322 tons, 27.1 %
   Hull, fittings & equipment: 445 tons, 37.5 %
   Fuel, ammunition & stores: 161 tons, 13.5 %
   Miscellaneous weights: 154 tons, 13.0 %
      - Above deck: 154 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     720 lbs / 327 Kg = 3.6 x 8.3 " / 210 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.40
   Metacentric height 1.9 ft / 0.6 m
   Roll period: 10.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - Recoil effect (Restricted arc if above 1.00): 0.49
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.555
   Length to Beam Ratio: 5.14 : 1
   'Natural speed' for length: 13.42 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 40
   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:   20.00 %,  13.00 ft / 3.96 m,  11.00 ft / 3.35 m
      - Forward deck:   30.00 %,  11.00 ft / 3.35 m,  10.00 ft / 3.05 m
      - Aft deck:   35.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Quarter deck:   15.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Average freeboard:      10.51 ft / 3.20 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 119.1 %
      - Above water (accommodation/working, high = better): 83.1 %
   Waterplane Area: 4,264 Square feet or 396 Square metres
   Displacement factor (Displacement / loading): 103 %
   Structure weight / hull surface area: 75 lbs/sq ft or 365 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 4.09
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather


8.27" guns are Krupp breech-loaders on fore and aft pivot mounts, while 32-pounders are muzzleloaders on the broadside.

Above-decks miscellaneous weight is masts & sails sufficient to propel the ship at 16.5 knots under normal conditions (half it's hull speed is 6.5 knots, + 10 knots for a 10% of normal displacement, at a cost of 15% normal displacement).