Here is a study to rebuilt the PDNs Inti & Illapa to Escort Cruiser
- Change old complex reciprocating steam engines to turbines with geared box.
- Speed update to 21.2kts & classic 7000nm@12kts
- Change the old 12x6"casemates to 6xT1x230.
- Change 12x90 to 4M2x120
- Add 40mm AA
Cost 2.42BP & 5.571$
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Inti - Illapa, Peru BB laid down 1901 (Engine 1916)
Commissioned in 1904 & 1906
Displacement:
10 000 t light; 10 587 t standard; 11 379 t normal; 12 012 t full load
Dimensions: Length overall / water x beam x draught
418.52 ft / 416.67 ft x 75.46 ft x 21.65 ft (normal load)
127.56 m / 127.00 m x 23.00 m x 6.60 m
Armament:
4 - 12.01" / 305 mm guns (2x2 guns), 865.70lbs / 392.67kg shells, 1901 Model
Breech loading guns in turrets (on barbettes)
on centreline, evenly spread
6 - 9.06" / 230 mm guns in single mounts, 371.24lbs / 168.39kg shells, 1901 Model
Breech loading guns in deck mounts with hoists
on side, evenly spread
8 - 4.72" / 120 mm guns (4x2 guns), 52.72lbs / 23.91kg shells, 1916 Model
Breech loading guns in deck mounts with hoists
on side, evenly spread, all raised mounts
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1916 Model
Quick firing guns in deck mounts
on side, evenly spread, all raised mounts
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, all raised mounts
Weight of broadside 6 120 lbs / 2 776 kg
Shells per gun, main battery: 100
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 9.84" / 250 mm 275.59 ft / 84.00 m 10.17 ft / 3.10 m
Ends: 4.02" / 102 mm 124.67 ft / 38.00 m 10.17 ft / 3.10 m
16.40 ft / 5.00 m Unarmoured ends
Upper: 5.00" / 127 mm 275.59 ft / 84.00 m 8.01 ft / 2.44 m
Main Belt covers 102 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 280 mm 3.94" / 100 mm 9.06" / 230 mm
2nd: 5.00" / 127 mm 1.18" / 30 mm 1.97" / 50 mm
3rd: 3.15" / 80 mm 1.18" / 30 mm 1.97" / 50 mm
4th: 0.79" / 20 mm - -
5th: 0.50" / 13 mm - -
- Armour deck: 2.56" / 65 mm, Conning tower: 9.06" / 230 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 22 999 shp / 17 157 Kw = 21.27 kts
Range 7 250nm at 12.00 kts
Bunker at max displacement = 1 425 tons
Complement:
550 - 716
Cost:
£1.113 million / $4.450 million
Distribution of weights at normal displacement:
Armament: 765 tons, 6.7 %
Armour: 3 782 tons, 33.2 %
- Belts: 1 897 tons, 16.7 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 713 tons, 6.3 %
- Armour Deck: 1 073 tons, 9.4 %
- Conning Tower: 99 tons, 0.9 %
Machinery: 857 tons, 7.5 %
Hull, fittings & equipment: 4 286 tons, 37.7 %
Fuel, ammunition & stores: 1 378 tons, 12.1 %
Miscellaneous weights: 310 tons, 2.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13 722 lbs / 6 224 Kg = 15.9 x 12.0 " / 305 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 4.2 ft / 1.3 m
Roll period: 15.5 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.50
Seaboat quality (Average = 1.00): 1.04
Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.585
Length to Beam Ratio: 5.52 : 1
'Natural speed' for length: 20.41 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.13 ft / 6.44 m
- Forecastle (18 %): 17.52 ft / 5.34 m (13.91 ft / 4.24 m aft of break)
- Mid (50 %): 13.58 ft / 4.14 m
- Quarterdeck (18 %): 13.58 ft / 4.14 m
- Stern: 13.58 ft / 4.14 m
- Average freeboard: 14.60 ft / 4.45 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 78.2 %
- Above water (accommodation/working, high = better): 107.3 %
Waterplane Area: 22 675 Square feet or 2 107 Square metres
Displacement factor (Displacement / loading): 95 %
Structure weight / hull surface area: 140 lbs/sq ft or 684 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 1.92
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Better view of the rebuilt
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--------------------------
& the originaly built
Inti - Illapa, Peru BB laid down 1901 (Engine 1900)
Displacement:
10 400 t light; 10 927 t standard; 11 628 t normal; 12 189 t full load
Dimensions: Length overall / water x beam x draught
416.67 ft / 416.67 ft x 75.46 ft x 22.13 ft (normal load)
127.00 m / 127.00 m x 23.00 m x 6.74 m
Armament:
4 - 12.01" / 305 mm guns (2x2 guns), 865.70lbs / 392.67kg shells, 1901 Model
Breech loading guns in turrets (on barbettes)
on centreline, evenly spread
12 - 5.98" / 152 mm guns in single mounts, 107.15lbs / 48.60kg shells, 1901 Model
Breech loading guns in casemate mounts
on side, evenly spread
12 - 3.54" / 90.0 mm guns in single mounts, 22.24lbs / 10.09kg shells, 1901 Model
Quick firing guns in deck mounts
on side, evenly spread, all raised mounts
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, all raised mounts
Weight of broadside 5 016 lbs / 2 275 kg
Shells per gun, main battery: 100
4 - 18.0" / 457.2 mm submerged torpedo tubes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 9.84" / 250 mm 275.59 ft / 84.00 m 10.17 ft / 3.10 m
Ends: 4.02" / 102 mm 124.67 ft / 38.00 m 10.17 ft / 3.10 m
16.40 ft / 5.00 m Unarmoured ends
Upper: 5.00" / 127 mm 275.59 ft / 84.00 m 8.01 ft / 2.44 m
Main Belt covers 102 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 280 mm 3.94" / 100 mm 9.06" / 230 mm
2nd: 5.00" / 127 mm - -
3rd: 0.79" / 20 mm - -
- Armour deck: 2.56" / 65 mm, Conning tower: 9.06" / 230 mm
Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 11 912 ihp / 8 886 Kw = 17.92 kts
Range 4 500nm at 10.00 kts
Bunker at max displacement = 1 261 tons (100% coal)
Complement:
559 - 727
Cost:
£1.151 million / $4.605 million
Distribution of weights at normal displacement:
Armament: 627 tons, 5.4 %
Armour: 3 832 tons, 33.0 %
- Belts: 1 897 tons, 16.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 762 tons, 6.6 %
- Armour Deck: 1 073 tons, 9.2 %
- Conning Tower: 100 tons, 0.9 %
Machinery: 1 861 tons, 16.0 %
Hull, fittings & equipment: 3 789 tons, 32.6 %
Fuel, ammunition & stores: 1 228 tons, 10.6 %
Miscellaneous weights: 290 tons, 2.5 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
11 405 lbs / 5 173 Kg = 13.2 x 12.0 " / 305 mm shells or 1.7 torpedoes
Stability (Unstable if below 1.00): 1.27
Metacentric height 5.1 ft / 1.5 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 73 %
- Recoil effect (Restricted arc if above 1.00): 0.34
Seaboat quality (Average = 1.00): 1.47
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.585
Length to Beam Ratio: 5.52 : 1
'Natural speed' for length: 20.41 kts
Power going to wave formation at top speed: 45 %
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: 16.73 ft / 5.10 m
- Forecastle (18 %): 13.45 ft / 4.10 m
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (18 %): 13.12 ft / 4.00 m
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 13.47 ft / 4.11 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 99.8 %
- Above water (accommodation/working, high = better): 102.0 %
Waterplane Area: 22 675 Square feet or 2 107 Square metres
Displacement factor (Displacement / loading): 90 %
Structure weight / hull surface area: 125 lbs/sq ft or 610 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.66
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
Inti- Ld 1901 - engine 1902 - in service 1904
Illapa - Ld 1903 - engine 1904 - in service 1906
Very nice upgrade. The big question is - are you getting value for your money? If this rebuild extends their service life another decade or so it's probably cheaper and quicker than scrapping and building new ships.
Quote...building new ships
What kind of ships?
I have balanced the efficiency / time / cost:
- I have noted the transfert time from Atlantic to Pacific - 12 days - to have a battle squadron (21-22kts).
- Actualy, the "18kts coal fleet" is unable to work as a part of a 21-22kts battle squadron.
-I have much coasts in South America to protect.
- Built other 21-22kts Battleships take much time, not really neccessary & is expensive for NUS.
- Rebuilt from coal to oil the 1905 PDNs & the 1908 ACs is a possibility.
-The rebuilt "ll be in the same spirit as Iberia made a few years with her ships.
- The cost must be judiciously calculated.
- I am going to test some SS to see what I can do with them...
----------------
Actualy the total cost calculated to rebuilt 5 ships of the "18kts coal fleet" is 9.35BPs
- are the 230mm from existing stock - it creates mixed heavy battery ......
1 alternative - 1 ship ALL 230mm ( 2x2, 6x1), 1 ship ALL 305mm (2 x2, 4 x1 ?) - but more expensive
I must built T1x230
The first SS with 2T2x12" +4T1x12" give 11560t & 11611t with 4T2x12"
Mixed battery is not a problem, the 2 groups of turrets fired alternatively with the same director of fire.
The max range is 23000m.
interesting solution on the mixed battery - plan to use dye as well?
it means loading cycles need to be in line - but given the 305s are in turret and 230s in mount + hoist - seems quite compatible (mount + hoist is not ideal for 370 lb shells !)
one aspect of mixed battery can be useful - depending on target - e.g. for Heavy Target could use AP 305 and 230 HE
- what is plan on type of shells carried + use by type of target?
Quote..and 230s in mount + hoist - seems quite compatible (mount + hoist is not ideal for 370 lb shells !)...
Mount & hoist... that's a SS typo mistake
That is not M1x230 but T1x230.
About shells; 305 AP & 230 HE is correct I think
update
Inti - Illapa, Peru BB laid down 1901 (Engine 1916)
Displacement:
10 120 t light; 10 709 t standard; 11 506 t normal; 12 144 t full load
Dimensions: Length overall / water x beam x draught
418.44 ft / 416.67 ft x 75.46 ft x 21.89 ft (normal load)
127.54 m / 127.00 m x 23.00 m x 6.67 m
Armament:
4 - 12.01" / 305 mm guns (2x2 guns), 865.70lbs / 392.67kg shells, 1901 Model
Breech loading guns in turrets (on barbettes)
on centreline, evenly spread
6 - 9.06" / 230 mm guns in single mounts, 371.24lbs / 168.39kg shells, 1901 Model
Breech loading guns in turrets (on barbettes)
on side, evenly spread
8 - 4.72" / 120 mm guns (4x2 guns), 52.72lbs / 23.91kg shells, 1916 Model
Breech loading guns in deck mounts with hoists
on side, evenly spread, all raised mounts
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1916 Model
Quick firing guns in deck mounts
on side, evenly spread, all raised mounts
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, all raised mounts
Weight of broadside 6 120 lbs / 2 776 kg
Shells per gun, main battery: 100
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 9.84" / 250 mm 275.59 ft / 84.00 m 10.17 ft / 3.10 m
Ends: 4.02" / 102 mm 124.67 ft / 38.00 m 10.17 ft / 3.10 m
16.40 ft / 5.00 m Unarmoured ends
Upper: 5.00" / 127 mm 275.59 ft / 84.00 m 8.01 ft / 2.44 m
Main Belt covers 102 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 280 mm 3.94" / 100 mm 9.06" / 230 mm
2nd: 4.72" / 120 mm 2.36" / 60 mm 1.97" / 50 mm
3rd: 2.76" / 70 mm 1.18" / 30 mm 1.97" / 50 mm
4th: 0.79" / 20 mm - -
5th: 0.50" / 13 mm - -
- Armour deck: 2.56" / 65 mm, Conning tower: 9.06" / 230 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 23 000 shp / 17 158 Kw = 21.24 kts
Range 7 250nm at 12.00 kts
Bunker at max displacement = 1 434 tons
Complement:
555 - 722
Cost:
£1.117 million / $4.467 million
Distribution of weights at normal displacement:
Armament: 765 tons, 6.6 %
Armour: 3 889 tons, 33.8 %
- Belts: 1 897 tons, 16.5 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 819 tons, 7.1 %
- Armour Deck: 1 073 tons, 9.3 %
- Conning Tower: 99 tons, 0.9 %
Machinery: 857 tons, 7.4 %
Hull, fittings & equipment: 4 293 tons, 37.3 %
Fuel, ammunition & stores: 1 386 tons, 12.0 %
Miscellaneous weights: 316 tons, 2.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13 781 lbs / 6 251 Kg = 15.9 x 12.0 " / 305 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 4.1 ft / 1.2 m
Roll period: 15.7 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.49
Seaboat quality (Average = 1.00): 1.01
Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.585
Length to Beam Ratio: 5.52 : 1
'Natural speed' for length: 20.41 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.24 ft / 6.17 m
- Forecastle (18 %): 16.96 ft / 5.17 m (13.68 ft / 4.17 m aft of break)
- Mid (50 %): 13.35 ft / 4.07 m
- Quarterdeck (18 %): 13.35 ft / 4.07 m
- Stern: 13.35 ft / 4.07 m
- Average freeboard: 14.29 ft / 4.36 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77.4 %
- Above water (accommodation/working, high = better): 104.6 %
Waterplane Area: 22 675 Square feet or 2 107 Square metres
Displacement factor (Displacement / loading): 96 %
Structure weight / hull surface area: 140 lbs/sq ft or 686 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.88
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Inti- Ld 1901 - engine 1902 - com 1904 - rebuilt 1921
Illapa - Ld 1903 - engine 1904 - com 1906 - rebuilt 1922
Cost:2.5BP & 5.528$