CSA Refits and Rebuilds

[Guinness]

With much of the CSA's cruiser force in need of refits, it is expected that the CSA's drydocks will be busy.

The first ship to be refit is the first class cruiser Davis. This effort is also considered the prototype for similar refits to come.

As part of the refit, the coal fired boilers were converted to oil firing. The outdated 4.85" 55 pounders were removed, and their casemates plated up. The mostly useless 6 pounder guns were likewise removed. In the place of the former secondary armament, 20 new pattern 4.75" 50 pounder guns in deck mounts were installed, as well as the new 1.5" AA gun.

Additionally, new centralized fire control was fitted, and various fittings and equipment were repaired, reconditioned, or replaced as appropriate.

The original Davis design can be found here: http://www.navalism.org/index.php?topic=743.msg4926#msg4926



Full Size Image: http://i292.photobucket.com/albums/mm18/mmichael453/CSS%20Davis/davisrefit.png

CSS Davis Refit, CSA First Class Cruiser laid down 1901

Displacement:
   11,717 t light; 12,188 t standard; 13,777 t normal; 15,048 t full load

Dimensions: Length overall / water x beam x draught
   528.00 ft / 528.00 ft x 70.00 ft x 22.00 ft (normal load)
   160.93 m / 160.93 m x 21.34 m  x 6.71 m

Armament:
      6 - 9.20" / 234 mm guns in single mounts, 380.00lbs / 172.37kg shells, 1901 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread
      20 - 4.75" / 121 mm guns in single mounts, 50.00lbs / 22.68kg shells, 1913 Model
     Quick firing guns in deck mounts
     on side, all amidships
      4 - 1.50" / 38.1 mm guns in single mounts, 1.69lbs / 0.77kg shells, 1913 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread, all raised mounts
      8 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1901 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 3,291 lbs / 1,493 kg
   Shells per gun, main battery: 100

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.00" / 178 mm   435.00 ft / 132.59 m   10.00 ft / 3.05 m
   Ends:   5.00" / 127 mm     93.00 ft / 28.35 m   8.00 ft / 2.44 m
   Upper:   4.00" / 102 mm   405.00 ft / 123.44 m   8.00 ft / 2.44 m
     Main Belt covers 127 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   9.00" / 229 mm   5.00" / 127 mm      7.00" / 178 mm
   2nd:   1.00" / 25 mm         -               -

   - Armour deck: 2.00" / 51 mm, Conning tower: 7.00" / 178 mm

Machinery:
   Oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 22,039 ihp / 16,441 Kw = 21.00 kts
   Range 13,250nm at 10.00 kts
   Bunker at max displacement = 2,860 tons

Complement:
   635 - 826

Cost:
   £1.201 million / $4.802 million

Distribution of weights at normal displacement:
   Armament: 427 tons, 3.1 %
   Armour: 3,717 tons, 27.0 %
      - Belts: 1,927 tons, 14.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 710 tons, 5.2 %
      - Armour Deck: 994 tons, 7.2 %
      - Conning Tower: 87 tons, 0.6 %
   Machinery: 3,082 tons, 22.4 %
   Hull, fittings & equipment: 4,141 tons, 30.1 %
   Fuel, ammunition & stores: 2,059 tons, 14.9 %
   Miscellaneous weights: 350 tons, 2.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     14,997 lbs / 6,803 Kg = 38.5 x 9.2 " / 234 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 1.32
   Metacentric height 4.8 ft / 1.5 m
   Roll period: 13.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.32
   Seaboat quality  (Average = 1.00): 1.52

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.593
   Length to Beam Ratio: 7.54 : 1
   'Natural speed' for length: 22.98 kts
   Power going to wave formation at top speed: 43 %
   Trim (Max stability = 0, Max steadiness = 100): 46
   Bow angle (Positive = bow angles forward): -10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      18.00 ft / 5.49 m
      - Forecastle (20 %):   17.00 ft / 5.18 m
      - Mid (68 %):      15.00 ft / 4.57 m
      - Quarterdeck (15 %):   15.00 ft / 4.57 m
      - Stern:      16.00 ft / 4.88 m
      - Average freeboard:   16.04 ft / 4.89 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 98.9 %
      - Above water (accommodation/working, high = better): 126.8 %
   Waterplane Area: 26,856 Square feet or 2,495 Square metres
   Displacement factor (Displacement / loading): 101 %
   Structure weight / hull surface area: 109 lbs/sq ft or 530 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.14
      - 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
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Misc Weights:
250t: Fire Control
50t: Reserve

Refurbishment Costs:
Basic Refurbishment: 20% of 11,558t = 2311.6 = $2.31
250t Functional Misc Weight (FC): 0.250 BP and $0.50
50t Non-functional Misc Weight: 0.050 BP and $0.05
134 t New Armament:  0.134 BP and $0.268

Total: 0.434 BP and $3.128

[Guinness]

Faced with refitting a large number of "Frigates" (as known in the CSA), the Navy has elected to convert at least some of them to dedicated flagship/tenders for 10 boat divisions of the new 250t Torpedo Boats.

During conversion, 3/4 of the boilers are removed, reducing top speed, and the rest converted to solely oil firing. The former boiler spaces were used for additional bunkerage and hold space. Most of the 4.85" 55 pounder guns, and all of the 6 pounder guns are removed, their handling rooms being used for additional berthing space. New workshops and berthing was built up on-deck, and space was made for reload torpedo storage. The armored belt was also removed.

Enough fuel is carried to refuel each boat once, and enough torpedoes carried to reload each boat once. The shops are relatively limited, and meant for various light maintenance tasks.

These ships are intended to be used to allow TB divisions to deploy along the CSA coast away from major ports, or for forward deployments elsewhere, though fuel would need to be supplied periodically by oilers.

Thomasville class frigates as originally designed: http://www.navalism.org/index.php?topic=747.msg4941#msg4941



AD-3 Puerto Penasco
AD-4 Chinle

CSS Thomasville Tender Refit, CSA TB Tender laid down 1900

Displacement:
   2,330 t light; 2,400 t standard; 2,933 t normal; 3,360 t full load

Dimensions: Length overall / water x beam x draught
   330.00 ft / 330.00 ft x 41.00 ft x 14.00 ft (normal load)
   100.58 m / 100.58 m x 12.50 m  x 4.27 m

Armament:
      2 - 4.85" / 123 mm guns in single mounts, 55.00lbs / 24.95kg shells, 1900 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread
      8 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1900 Model
     Breech loading guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 114 lbs / 52 kg
   Shells per gun, main battery: 170

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

Machinery:
   Oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 2,577 ihp / 1,923 Kw = 14.80 kts
   Range 11,500nm at 10.00 kts
   Bunker at max displacement = 961 tons

Complement:
   199 - 259

Cost:
   £0.145 million / $0.581 million

Distribution of weights at normal displacement:
   Armament: 15 tons, 0.5 %
   Armour: 5 tons, 0.2 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 5 tons, 0.2 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 366 tons, 12.5 %
   Hull, fittings & equipment: 744 tons, 25.3 %
   Fuel, ammunition & stores: 603 tons, 20.6 %
   Miscellaneous weights: 1,200 tons, 40.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,284 lbs / 1,489 Kg = 57.6 x 4.9 " / 123 mm shells or 1.0 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 14.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 55 %
         - Recoil effect (Restricted arc if above 1.00): 0.04
   Seaboat quality  (Average = 1.00): 1.52

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.542
   Length to Beam Ratio: 8.05 : 1
   'Natural speed' for length: 18.17 kts
   Power going to wave formation at top speed: 34 %
   Trim (Max stability = 0, Max steadiness = 100): 36
   Bow angle (Positive = bow angles forward): -12.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      12.00 ft / 3.66 m
      - Forecastle (20 %):   11.00 ft / 3.35 m
      - Mid (50 %):      10.00 ft / 3.05 m
      - Quarterdeck (15 %):   10.00 ft / 3.05 m
      - Stern:      11.00 ft / 3.35 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): 89.3 %
      - Above water (accommodation/working, high = better): 91.8 %
   Waterplane Area: 9,372 Square feet or 871 Square metres
   Displacement factor (Displacement / loading): 143 %
   Structure weight / hull surface area: 53 lbs/sq ft or 258 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.19
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is adequate
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Ship Designed to Support 20 TB-01 class Torpedo Boats
Ship can support up to 6836 tons of warships

Misc Weights:
534 tons - Additional Bunkerage
60 tons  - Reload Torpedoes
25 tons - Long range Marconi
400 tons - Additional accomodations for 200 crew
181 tons - Shops, etc.

Reconstruction Costs:
Basic Reconstruction: 25% of 2373tons = 593.25t = $0.59
Functional Misc Weight: 266t = 0.27 BP and $0.53
Non-Functional Misc Weight: 900t = 0.9BP and $0.90

Scrap Value: 0.16 BP and $0.16

Total: 1.01 BP and $1.86

[Guinness]

A Refurbishment of the TR-144 (aka "A" class) Torpedo Rams. Armament is updated to 1915 standards, including new 4" guns firing heavier rounds, new 20" torpedoes, and depth charges. Ship is converted from coal to oil firing. Ship is refurbished. 25 such refurbishments planned (with the other 6 members of the class going to Egypt as part of a more complicated arms deal). The result is a useful second-line Torpedo Ram, which can be useful also for coast defense or first line duties in a pinch.

Original here: http://www.navalism.org/index.php?topic=749.msg4954#msg4954

TR-144 Updated, CSA Torpedo Ram laid down 1900

Displacement:
   538 t light; 558 t standard; 633 t normal; 693 t full load

Dimensions: Length overall / water x beam x draught
   237.50 ft / 237.50 ft x 23.50 ft x 9.75 ft (normal load)
   72.39 m / 72.39 m x 7.16 m  x 2.97 m

Armament:
      2 - 4.00" / 102 mm guns in single mounts, 30.00lbs / 13.61kg shells, 1915 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      4 - 1.00" / 25.4 mm guns (2x2 guns), 0.50lbs / 0.23kg shells, 1915 Model
     Machine guns in deck mounts
     on side, all forward
      6 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1900 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 62 lbs / 28 kg
   Shells per gun, main battery: 200
   4 - 20.0" / 508 mm above water torpedoes

Machinery:
   Oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 10,980 ihp / 8,191 Kw = 27.00 kts
   Range 3,890nm at 10.00 kts
   Bunker at max displacement = 134 tons
     Caution: Delicate, lightweight machinery

Complement:
   63 - 82

Cost:
   £0.079 million / $0.315 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1.3 %
   Machinery: 379 tons, 59.9 %
   Hull, fittings & equipment: 140 tons, 22.1 %
   Fuel, ammunition & stores: 95 tons, 14.9 %
   Miscellaneous weights: 11 tons, 1.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     110 lbs / 50 Kg = 3.5 x 4.0 " / 102 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.25
   Metacentric height 0.8 ft / 0.3 m
   Roll period: 10.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.15
   Seaboat quality  (Average = 1.00): 0.88

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.407
   Length to Beam Ratio: 10.11 : 1
   'Natural speed' for length: 15.41 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 79
   Bow angle (Positive = bow angles forward): -30.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      9.00 ft / 2.74 m
      - Forecastle (20 %):   12.00 ft / 3.66 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:   9.16 ft / 2.79 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 205.3 %
      - Above water (accommodation/working, high = better): 51.4 %
   Waterplane Area: 3,450 Square feet or 321 Square metres
   Displacement factor (Displacement / loading): 20 %
   Structure weight / hull surface area: 21 lbs/sq ft or 104 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.40
      - Overall: 0.55
   Hull space for machinery, storage, compartmentation is extremely poor
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Misc Weights:
4t: Torpedoes
6t: 18 Depth Charges
1t: Reserve

Refurbishment costs:
Armament: 14t: 0.014 BP and $0.028
Non-functional Misc: 1t: $0.0005
Fuel change to all oil: 146t (full bunkerage): $0.073

Total: 0.014BP and $0.115

[Guinness]

The finalized A-class refurbishment, which includes a short range wireless set:

Original here: http://www.navalism.org/index.php?topic=749.msg4954#msg4954

A-Class Updated, CSA Torpedo Ram laid down 1900

Displacement:
   540 t light; 558 t standard; 633 t normal; 693 t full load

Dimensions: Length overall / water x beam x draught
   237.50 ft / 237.50 ft x 23.50 ft x 9.75 ft (normal load)
   72.39 m / 72.39 m x 7.16 m  x 2.97 m

Armament:
      2 - 3.50" / 88.9 mm guns in single mounts, 20.00lbs / 9.07kg shells, 1915 Model
     Quick firing guns in deck mounts
     on centreline, evenly spread, 1 raised mount
      4 - 1.00" / 25.4 mm guns (2x2 guns), 0.50lbs / 0.23kg shells, 1915 Model
     Machine guns in deck mounts
     on side, all forward
      6 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1900 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 42 lbs / 19 kg
   Shells per gun, main battery: 200
   3 - 20.0" / 508 mm above water torpedoes

Machinery:
   Oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 10,980 ihp / 8,191 Kw = 27.00 kts
   Range 3,890nm at 10.00 kts
   Bunker at max displacement = 134 tons
     Caution: Delicate, lightweight machinery

Complement:
   63 - 82

Cost:
   £0.077 million / $0.308 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 0.9 %
   Machinery: 381 tons, 60.2 %
   Hull, fittings & equipment: 138 tons, 21.8 %
   Fuel, ammunition & stores: 92 tons, 14.6 %
   Miscellaneous weights: 16 tons, 2.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     113 lbs / 51 Kg = 5.3 x 3.5 " / 89 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.27
   Metacentric height 0.9 ft / 0.3 m
   Roll period: 10.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.11
   Seaboat quality  (Average = 1.00): 0.89

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.407
   Length to Beam Ratio: 10.11 : 1
   'Natural speed' for length: 15.41 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 80
   Bow angle (Positive = bow angles forward): -30.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      9.00 ft / 2.74 m
      - Forecastle (20 %):   12.00 ft / 3.66 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:   9.16 ft / 2.79 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 203.7 %
      - Above water (accommodation/working, high = better): 61.8 %
   Waterplane Area: 3,450 Square feet or 321 Square metres
   Displacement factor (Displacement / loading): 20 %
   Structure weight / hull surface area: 21 lbs/sq ft or 102 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.37
      - Overall: 0.55
   Hull space for machinery, storage, compartmentation is extremely poor
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Misc Weights:
3t: Torpedoes
2t: 6 Depth Charges (single stern track)
10t: Short Range Marconi
1t: Reserve

Range at 15 knots: 1480nm
Range at 20 knots: 672nm
Range at top speed: 266nm or 9.85 hours

Refurbishment costs:
Armament: 11t: 0.011 BP and $0.022
Fucntional Misc: 10t: 0.01 BP and $0.01
Non-functional Misc: 1t: $0.0005
Fuel change to all oil: 92t: $0.046

Total: 0.021BP and $0.0855

[Borys]

Looks good!
Borys

[Guinness]

Refit plans for Virginia, the first of the Confederate pre-dreads which will go under the torch for radical reconstruction. Hull is stretched by 27.5 feet aft of the midships turret to make room for one more turret. Some turret protection is rearranged, and bulges are added. Additionally, completely new machinery is installed which brings the ship up to battleline speed, and fire control and modern C&C facilities are added.

CSS Virginia Refit, CSA Battleship laid down 1905 (Engine 1916)

Displacement:
   19,470 t light; 20,619 t standard; 21,565 t normal; 22,321 t full load

Dimensions: Length overall / water x beam x draught
   577.50 ft / 577.50 ft x 80.00 ft (Bulges 85.33 ft) x 22.00 ft (normal load)
   176.02 m / 176.02 m x 24.38 m (Bulges 26.01 m)  x 6.71 m

Armament:
      8 - 13.50" / 343 mm guns (4x2 guns), 1,250.00lbs / 566.99kg shells, 1905 Model
     Breech loading guns in turrets (on barbettes)
     on centreline, evenly spread
     Aft Main mounts separated by engine room
      14 - 5.50" / 140 mm guns in single mounts, 75.00lbs / 34.02kg shells, 1917 Model
     Quick firing guns in casemate mounts
     on side, evenly spread
     14 guns in hull casemates - Limited use in heavy seas
      2 - 1.58" / 40.0 mm guns in single mounts, 2.00lbs / 0.91kg shells, 1917 Model
     Anti-aircraft guns in deck mounts
     on side ends, evenly spread, all raised mounts
      8 - 1.00" / 25.4 mm guns (4x2 guns), 0.50lbs / 0.23kg shells, 1917 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread, all raised mounts
      2 - 5.50" / 140 mm guns in single mounts, 75.00lbs / 34.02kg shells, 1905 Model
     Breech loading guns in deck mounts with hoists
     on side, evenly spread, all raised mounts
   Weight of broadside 11,208 lbs / 5,084 kg
   Shells per gun, main battery: 113

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   14.7" / 373 mm   377.50 ft / 115.06 m   12.00 ft / 3.66 m
   Ends:   5.25" / 133 mm   200.00 ft / 60.96 m   12.00 ft / 3.66 m
   Upper:   5.25" / 133 mm   327.50 ft / 99.82 m   10.00 ft / 3.05 m
     Main Belt covers 101 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   14.7" / 373 mm   3.45" / 88 mm      14.7" / 373 mm
   2nd:   5.25" / 133 mm         -         3.45" / 88 mm
   3rd:         -      1.00" / 25 mm            -
   4th:   0.50" / 13 mm         -               -
   5th:   1.50" / 38 mm   1.00" / 25 mm      3.00" / 76 mm

   - Armour deck: 3.45" / 88 mm, Conning tower: 14.70" / 373 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 25,450 shp / 18,986 Kw = 20.10 kts
   Range 8,085nm at 10.00 kts
   Bunker at max displacement = 1,702 tons

Complement:
   889 - 1,156

Cost:
   £1.988 million / $7.953 million

Distribution of weights at normal displacement:
   Armament: 1,398 tons, 6.5 %
   Armour: 8,930 tons, 41.4 %
      - Belts: 4,121 tons, 19.1 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 2,208 tons, 10.2 %
      - Armour Deck: 2,355 tons, 10.9 %
      - Conning Tower: 245 tons, 1.1 %
   Machinery: 948 tons, 4.4 %
   Hull, fittings & equipment: 7,795 tons, 36.1 %
   Fuel, ammunition & stores: 2,095 tons, 9.7 %
   Miscellaneous weights: 400 tons, 1.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     30,784 lbs / 13,963 Kg = 25.0 x 13.5 " / 343 mm shells or 3.6 torpedoes
   Stability (Unstable if below 1.00): 1.12
   Metacentric height 4.4 ft / 1.3 m
   Roll period: 17.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.63
   Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0.696
   Length to Beam Ratio: 6.77 : 1
   'Natural speed' for length: 24.03 kts
   Power going to wave formation at top speed: 42 %
   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:      24.00 ft / 7.32 m
      - Forecastle (20 %):   20.00 ft / 6.10 m (16.00 ft / 4.88 m aft of break)
      - Mid (50 %):      16.00 ft / 4.88 m
      - Quarterdeck (15 %):   16.00 ft / 4.88 m
      - Stern:      16.00 ft / 4.88 m
      - Average freeboard:   17.12 ft / 5.22 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): 126.5 %
   Waterplane Area: 36,905 Square feet or 3,429 Square metres
   Displacement factor (Displacement / loading): 96 %
   Structure weight / hull surface area: 155 lbs/sq ft or 757 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.11
      - 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
   Good seaboat, rides out heavy weather easily

Misc Weights:
250t: Fire Control
25t: Long-Range Wireless
10t: Short Range Wireless
15t: Other Functional Stuff
50t: Flagship Facilities
50t: Reserve

Costs:

Base Cost:                            $4.32   1.73
Armament:                       475   $0.95   0.48
Machinery:                      948   $1.90   0.95
Armor:                          949   $0.95   0.95
Other Functional Misc:          350   $0.35   0.35
Hull, Fittings, and Equipment:    0   $4.41   4.41
Fuel, Ammunition, Stores:        89   $0.04   0.00
Other Non-Functional Misc:       50   $0.03   0.00

Total Costs:                         $12.94   8.86

Time to Complete:                   15

[P3D]

My usual argument about bulging at reconstruction is that SS2 does not account well for the weights, the reinforcement the added bulge provides is over estimated.
It should be reflected in a composite strength of 1.02-1.03. With the radical 'fit a new turret in' this is even more so.
28' extension is not enough to cram a ~28' diameter barbette AND another 30-40' for the guns themselves on the centerline. Unless the turret is superfiring it won't fit.

Main belt should be extended by the same amount as the hull.

This refit also changes the secondary layout from 24x4.85" to 14x5.5".

[Guinness]

My usual argument about bulging at reconstruction is that SS2 does not account well for the weights, the reinforcement the added bulge provides is over estimated.
It should be reflected in a composite strength of 1.02-1.03. With the radical 'fit a new turret in' this is even more so.

I've heard that argument before, but it's not in the rules. This doesn't mean I'm not personally opposed to such a revision, but harping about it in other people's designs isn't the right way to propose a revision.

28' extension is not enough to cram a ~28' diameter barbette AND another 30-40' for the guns themselves on the centerline. Unless the turret is superfiring it won't fit.

I've got an illustration in the works now. The midships turrets end up back to back, with the existing midships turret turned around to face forward. I believe this works as the boiler spaces, which were already split fore and aft by the midships barbette, etc, can be smaller with the entirely new machinery. So a little bit of that space aft can be used for ammunition handling, etc. and a little bit of that space forward can be used for the new FC installation and other C&C needs. Superstructure shrinks a bit. At any rate, the old ship, at 550 feet long with only 3 main gun mounts, has a lot of free deck space.

Main belt should be extended by the same amount as the hull.

Dammit. I thought I'd fixed that.

This refit also changes the secondary layout from 24x4.85" to 14x5.5".

Yes, that's included in the new armament weights.

[Guinness]

I've revised the posting above, having fixed the main belt length, etc.

[Guinness]

I've split the topic where P3D proposed updating the refit rules, and put that thread in General Naval Discussion here: http://www.navalism.org/index.php?topic=3784.0

[Guinness]

Finally... some art to go with this redesign:

(click all these for the full-sized image)



And a waterline to waterline comparison with the pre-reconstruction configuration:

[P3D]

Have you tried giving the gun barrels some taper? They should be thinner at the muzzle.

You have pretty limited firing arcs, like +45 to -15 degrees to the sides, and blast would interfere with operating those AA guns.

[Guinness]

I've been messing around various effects to try to get a little bit of taper on the big guns, but nothing I like the look of yet. I'm getting close on a future gun though. In this case, it was just a matter of cutting and pasting previous work.

Here's a rendering with the arcs superimposed. Q turret's fire might interfere with the 2-pounder mounts from time to time, but otherwise I think they're ok. A and X have 300 degree arcs of fire. P and Q have 240 degree free arcs (ie, the wooded sectors are all 60 degrees). 30 degree blind arcs have been what I've been using as standard across all my Confederate capital ships.

[Guinness]

The Davis class reconstructions having proven generally successful, the Confederate Navy has turned it's eyes toward refitting the rest of it's 1st and 2nd class cruisers. The Mosby 1st class cruisers proved uneconomic to refit and have been put on the disposal list, but the Buchanan and Mobile classes of 2nd class cruisers will all be taken in hand in 1917, with the Rattlesnake class following as soon as 1918.

The first design to be completed is the Buchanan class refurbishment. The main armament of 7.5"L35 guns and their mounts are removed, and replaced with new 7.5"L45 twin mounts, which were designed from the outset to use the same barbette dimensions. In addition, the old secondary armament of 4.85" guns is removed, and replaced by another pair of 7.5"L45's in single mounts on the beams, and 6 3.5" guns, who's main role is seen as dispatching smaller prey in the trade warfare role. In addition, the former submerged torpedo tubes are replaced by 6 of the latest 21" torpedoes in above waterline triple mounts.

To speed the drawing of plans, the forward superstructure of the Chattanooga class 3rd class cruisers was used as the basis of the forward superstructure for the reburbished ships.

Centralized fire control is included. The machinery plant is converted to 100% oil firing, but otherwise left as it was. As such, the top speed is only adequate for secondary roles, and it is considered unlikely that these ships would ever serve with the main fleet. Still, for roles such as trade protection and commerce raiding, long range strategic scouting, and convoy escort, and for showing the flag from time to time, it is expected that these ships will continue to more than adequate.

Original design: http://www.navalism.org/index.php?topic=744.msg4930#msg4930

CSS Buchanan Simple Refurbishment, CSA 2nd Class Cruiser laid down 1901

Displacement:
   7,600 t light; 7,914 t standard; 9,159 t normal; 10,155 t full load

Dimensions: Length overall / water x beam x draught
   531.00 ft / 531.00 ft x 60.00 ft x 18.00 ft (normal load)
   161.85 m / 161.85 m x 18.29 m  x 5.49 m

Armament:
     6 - 7.50" / 191 mm guns (3x2 guns), 200.00lbs / 90.72kg shells, 1910 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, majority forward
     2 - 7.50" / 191 mm guns in single mounts, 200.00lbs / 90.72kg shells, 1910 Model
     Breech loading guns in deck mounts with hoists
     on side, all amidships
     6 - 3.50" / 88.9 mm guns in single mounts, 20.00lbs / 9.07kg shells, 1906 Model
     Quick firing guns in deck mounts
     on centreline, all amidships
     2 - 1.58" / 40.0 mm guns in single mounts, 2.00lbs / 0.91kg shells, 1915 Model
     Anti-aircraft guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
     8 - 1.00" / 25.4 mm guns (4x2 guns), 0.50lbs / 0.23kg shells, 1908 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 1,728 lbs / 784 kg
   Shells per gun, main battery: 130
   6 - 21.0" / 533.4 mm above water torpedoes

Armour:
  - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.00" / 102 mm   531.00 ft / 161.85 m   8.00 ft / 2.44 m
   Ends:   Unarmoured
     Main Belt covers 154 % of normal length

  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.00" / 76 mm   1.00" / 25 mm      2.00" / 51 mm
   2nd:   1.00" / 25 mm   1.00" / 25 mm      2.00" / 51 mm
   3rd:   1.00" / 25 mm         -               -
   5th:   0.50" / 13 mm         -               -

  - Armour deck: 1.50" / 38 mm, Conning tower: 4.00" / 102 mm

Machinery:
   Oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 18,402 ihp / 13,728 Kw = 21.50 kts
   Range 13,042nm at 10.00 kts
   Bunker at max displacement = 2,241 tons

Complement:
   467 - 608

Cost:
   £0.818 million / $3.271 million

Distribution of weights at normal displacement:
   Armament: 228 tons, 2.5 %
   Armour: 1,435 tons, 15.7 %
      - Belts: 629 tons, 6.9 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 147 tons, 1.6 %
      - Armour Deck: 622 tons, 6.8 %
      - Conning Tower: 38 tons, 0.4 %
   Machinery: 2,574 tons, 28.1 %
   Hull, fittings & equipment: 3,035 tons, 33.1 %
   Fuel, ammunition & stores: 1,560 tons, 17.0 %
   Miscellaneous weights: 327 tons, 3.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     8,758 lbs / 3,973 Kg = 41.5 x 7.5 " / 191 mm shells or 1.3 torpedoes
   Stability (Unstable if below 1.00): 1.45
   Metacentric height 4.4 ft / 1.3 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.28
   Seaboat quality  (Average = 1.00): 1.56

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.559
   Length to Beam Ratio: 8.85 : 1
   'Natural speed' for length: 23.04 kts
   Power going to wave formation at top speed: 41 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   Bow angle (Positive = bow angles forward): -12.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      17.00 ft / 5.18 m
      - Forecastle (20 %):   16.00 ft / 4.88 m
      - Mid (50 %):      15.00 ft / 4.57 m
      - Quarterdeck (15 %):   15.00 ft / 4.57 m
      - Stern:      16.00 ft / 4.88 m
      - Average freeboard:   15.51 ft / 4.73 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 114.1 %
      - Above water (accommodation/working, high = better): 121.2 %
   Waterplane Area: 22,423 Square feet or 2,083 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 93 lbs/sq ft or 455 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 1.03
      - Overall: 1.00
   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
   Excellent seaboat, comfortable

Base Cost:                       $1.49    0.00
Armament:                  228   $0.46    0.23
Machinery:                -148   $0.00    0.00
Armor:                      80   $0.08    0.08
Other Functional Misc:     297   $0.30    0.30
Hull, Fittings, and Equip   36   $0.01    0.00
Fuel, Ammunition, Stores: -170   $0.00    0.00
Other Non-Functional Misc   33   $0.02    0.00

Scrap Value:               333   $0.05 0.04995

Total Costs:                     $2.29    0.56

Time to Complete:                    4

EDIT: fixed the costs, as I just realized I was paying for the barbettes that aren't being replaced.

[Jefgte]

As usual, a very nice Guinness drawing.

I like the global look of the cruiser with 4 funnels.

Just a remark, I think that T2x191 are too slim.



Jef  ;)