1920 Amazonas-Tarapaca Rebuilt

Jefgte · February 15, 2011, 09:13:34 AM

These 2 x 3400T cruisers were originaly built in 1907-1910 for long range raid.
Now, they have poor armament to be used in Armada.

NUS Admiralty with the new aircraft techno & inspired by GC Espiritu Santo Class,
could test a rebuilt with an aft platform for aircraft. The hull of these cruisers is enough to install a 62m platform aft.

(The rebuilt is similar to USS Pennsylvania or HMS Furious aft deck)

Here is the rebuilt plan with the Calculation.

CR Amazonas 1907 – 3400T
Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 26 190 shp / 19 538 Kw = 26.97 kts
   Range 12 000nm at 10.00 kts
   Bunker at max displacement = 1 281 tons (20% coal)
Distribution of weights at normal displacement:
   Armament: 38 tons, 0.9 %
   Armour: 381 tons, 9.0 %
    - Belts: 131 tons, 3.1 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 12 tons, 0.3 %
    - Armour Deck: 238 tons, 5.7 %
    - Conning Tower: 0 tons, 0.0 %
   Machinery: 1 212 tons, 28.7 %
   Hull, fittings & equipment: 1 668 tons, 39.5 %
   Fuel, ammunition & stores: 818 tons, 19.4 %
   Miscellaneous weights: 100 tons, 2.4 %

SC Amazonas 1920 – 3650T
Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 26 190 shp / 19 537 Kw = 26.83 kts
   Range 7 000nm at 12.00 kts
   Bunker at max displacement = 1 057 tons
Distribution of weights at normal displacement:
   Armament: 68 tons, 1.6 %
   Armour: 389 tons, 8.9 %
    - Belts: 135 tons, 3.1 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 15 tons, 0.3 %
    - Armour Deck: 238 tons, 5.5 %
    - Conning Tower: 0 tons, 0.0 %
   Machinery: 1 190 tons, 27.3 %
   Hull, fittings & equipment: 1 777 tons, 40.7 %
   Fuel, ammunition & stores: 716 tons, 16.4 %
   Miscellaneous weights: 226 tons, 5.2 %

FINAL Calculation
Base Cost of Rebuild - 25% of Original cost & 10% of Original BP:
3400t x 0.25 & 3400t x 0.10: $0.85 and 0.34BP
Coal bunkers removed & use for accommodations & armament installations (152mm mounts & hoists) OIL was 80% & now 83%
Armament: +30T
Armor: +8T
Belt: +4T
Machinery:-22T
Hull, fittings & equipment: +109T
Fuel, ammunition & stores:-102T
Total: +26T
So – 3400T to 3650T
0.25£ & 0.25BP
Total cost
$1.1 and 0.59BP
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Amazonas, Peru 3650T ScoutCruiser laid down 1907 (Engine 1909) - 1920 REBUILT

Displacement:
   3 650 t light; 3 779 t standard; 4 367 t normal; 4 837 t full load

Dimensions: Length overall / water x beam x draught
   498.69 ft / 498.69 ft x 52.49 ft x 13.77 ft (normal load)
   152.00 m / 152.00 m x 16.00 m x 4.20 m

Armament:
1 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1907 Model
    Quick firing gun in a deck mount with hoist
    on centreline forward
4 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1907 Model
    Quick firing guns in deck mounts with hoists
    on side, all amidships
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1907 Model
    Quick firing guns in deck mounts
    on side, evenly spread, all raised mounts
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1907 Model
    Machine guns in deck mounts
    on side, evenly spread
   Weight of broadside 548 lbs / 249 kg
   Shells per gun, main battery: 120
   4 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.18" / 30 mm   347.77 ft / 106.00 m   8.01 ft / 2.44 m
   Ends:   Unarmoured
    Main Belt covers 107 % of normal length

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm    -          -
   2nd:   0.79" / 20 mm    -          -
   3rd:   0.50" / 13 mm    -          -

- Armour deck: 0.79" / 20 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 26 190 shp / 19 537 Kw = 26.83 kts
   Range 7 000nm at 12.00 kts
   Bunker at max displacement = 1 057 tons

Complement:
   268 - 349

Cost:
   £0.352 million / $1.408 million

Distribution of weights at normal displacement:
   Armament: 68 tons, 1.6 %
   Armour: 389 tons, 8.9 %
    - Belts: 135 tons, 3.1 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 15 tons, 0.3 %
    - Armour Deck: 238 tons, 5.5 %
    - Conning Tower: 0 tons, 0.0 %
   Machinery: 1 190 tons, 27.3 %
   Hull, fittings & equipment: 1 777 tons, 40.7 %
   Fuel, ammunition & stores: 716 tons, 16.4 %
   Miscellaneous weights: 226 tons, 5.2 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    5 395 lbs / 2 447 Kg = 50.0 x 6.0 " / 152 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.39
   Metacentric height 3.4 ft / 1.0 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.15
   Seaboat quality (Average = 1.00): 1.26

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.424
   Length to Beam Ratio: 9.50 : 1
   'Natural speed' for length: 22.33 kts
   Power going to wave formation at top speed: 48 %
   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:      21.49 ft / 6.55 m
    - Forecastle (18 %):   14.93 ft / 4.55 m
    - Mid (40 %):      12.30 ft / 3.75 m
    - Quarterdeck (18 %):   12.30 ft / 3.75 m
    - Stern:      12.30 ft / 3.75 m
    - Average freeboard:   13.54 ft / 4.13 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 106.3 %
      - Above water (accommodation/working, high = better): 132.7 %
   Waterplane Area: 16 366 Square feet or 1 520 Square metres
   Displacement factor (Displacement / loading): 123 %
   Structure weight / hull surface area: 76 lbs/sq ft or 369 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 1.00
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Amazonas - LD 1907 - in service 1909
Rebuilt in 1920 with aft seaplane deck & new 6" guns
25 Tons for high rangefinders
75 Tons for 3 seaplanes
92t for aft light deck

---
The original SS

Amazonas, Peru 3400T Cruiser Raider laid down 1907 (Engine 1909)

Displacement:
   3 400 t light; 3 506 t standard; 4 218 t normal; 4 787 t full load

Dimensions: Length overall / water x beam x draught
   498.69 ft / 498.69 ft x 52.49 ft x 13.30 ft (normal load)
   152.00 m / 152.00 m x 16.00 m x 4.05 m

Armament:
2 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1907 Model
    Breech loading guns in deck mounts with hoists
    on centreline, evenly spread
4 - 3.54" / 90.0 mm guns in single mounts, 22.24lbs / 10.09kg shells, 1907 Model
    Quick firing guns in deck mounts
    on centreline, all amidships
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1907 Model
    Machine guns in deck mounts
    on side, evenly spread, all raised mounts
   Weight of broadside 305 lbs / 138 kg
   Shells per gun, main battery: 120
   8 - 18.0" / 457.2 mm above water torpedoes

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.18" / 30 mm   334.65 ft / 102.00 m   8.01 ft / 2.44 m
   Ends:   Unarmoured
    Main Belt covers 103 % of normal length

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm    -          -
   2nd:   0.79" / 20 mm    -          -
   3rd:   0.50" / 13 mm    -          -

- Armour deck: 0.79" / 20 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 26 190 shp / 19 538 Kw = 26.97 kts
   Range 12 000nm at 10.00 kts
   Bunker at max displacement = 1 281 tons (20% coal)

Complement:
   261 - 340

Cost:
   £0.321 million / $1.283 million

Distribution of weights at normal displacement:
   Armament: 38 tons, 0.9 %
   Armour: 381 tons, 9.0 %
    - Belts: 131 tons, 3.1 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 12 tons, 0.3 %
    - Armour Deck: 238 tons, 5.7 %
    - Conning Tower: 0 tons, 0.0 %
   Machinery: 1 212 tons, 28.7 %
   Hull, fittings & equipment: 1 668 tons, 39.5 %
   Fuel, ammunition & stores: 818 tons, 19.4 %
   Miscellaneous weights: 100 tons, 2.4 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    5 977 lbs / 2 711 Kg = 55.3 x 6.0 " / 152 mm shells or 1.2 torpedoes
   Stability (Unstable if below 1.00): 1.50
   Metacentric height 3.8 ft / 1.2 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 73 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality (Average = 1.00): 1.32

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.424
   Length to Beam Ratio: 9.50 : 1
   'Natural speed' for length: 22.33 kts
   Power going to wave formation at top speed: 48 %
   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:      21.98 ft / 6.70 m
    - Forecastle (18 %):   15.42 ft / 4.70 m
    - Mid (40 %):      12.80 ft / 3.90 m
    - Quarterdeck (18 %):   12.80 ft / 3.90 m
    - Stern:      12.80 ft / 3.90 m
    - Average freeboard:   14.03 ft / 4.28 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 103.1 %
      - Above water (accommodation/working, high = better): 133.7 %
   Waterplane Area: 16 366 Square feet or 1 520 Square metres
   Displacement factor (Displacement / loading): 131 %
   Structure weight / hull surface area: 71 lbs/sq ft or 346 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 0.99
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Amazonas - LD 1907 - in service 1909

25 Tons for high rangefinders
60 mines
15 tons for 2 observation baloons
10 tons for normal reserves very long cruise
100 tons overloaded for extra reserves very long cruise

Jefgte · February 15, 2011, 09:58:34 AM

Better drawing ?

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Sachmle · February 15, 2011, 10:41:11 AM

Huh...with the upslope you could probably even land on that.

Jefgte · February 15, 2011, 04:21:07 PM

QuoteHuh...with the upslope you could probably even land on that.

Upslope give some advantages;
- A higher speed to take off, with the cruiser at slow speed.
- A quicker stop when the plane land & the cruiser running at high speed. Note the rope net between the short mast on the flying deck.
- Economise the weight of the flying deck with small aft supports.

Jef

mentat · February 16, 2011, 06:00:27 AM

Upward slope is novel - but on Landing - given how steep it looks - isn't there a Risk of Prop hitting deck :(

Jefgte · February 16, 2011, 07:00:44 AM

The deck is design like this with the 1919-1920 considerations.
Deck form could change after the first tests with aircrafts in 1921.
That is a futur history...

Jef ;)

1920 Amazonas-Tarapaca Rebuilt

Jefgte

Jefgte

Sachmle

Jefgte

mentat

Jefgte