WesWorld

In a surprise development, the Filipino Navy has announced that the Luzon-class cruiser Mindoro, previously scheduled to be scrapped in the third quarter of 1925, upon the commissioning of her replacement, Basilian, will instead be converted into the Philippines' first aircraft carrier.

PRS Mindoro, aircraft carrier conversion, laid down 1925

Length, 504 ft x Beam, 69.5 ft x Depth, 26.5 ft
15966 tons normal displacement (13512 tons standard)

Air Group: 46 aircraft

Main battery: 4 x 3.94-inch / 100mm (4 x 1; 2 superfiring)
Secondary battery: 8 x 5.10-inch / 130mm (4 x 2)
AA battery: 12 x 1.57-inch / 40mm
Light battery: 8 x 0.98-inch / 25mm

Weight of broadside: 680 lbs

Main belt, 8.0 inches; ends unarmored
Armor deck, average 1.0 inches
C.T., 2.5 inches

Battery armor:
Main, 1.0" / secondary, 2.0"
AA, 0.5" shields / light guns, 0.2" shields

Maximum speed for 29993 shp = 22.15 knots
Approximate cruising radius, 10000 nm / 17 kts

Typical complement: 710-923


Estimated cost, $8.738 million (£2.184 million)

Remarks:

Relative extent of belt armor, 47 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.

Ship is roomy, with superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 85 tons = 1 pct
Armor, total ..................... 1181 tons = 7 pct

Belt 524 tons = 3 pct
Deck 461 tons = 3 pct
C.T. 34 tons = 0 pct
Armament 162 tons = 1 pct

Machinery ........................ 974 tons = 6 pct
Hull and fittings; equipment ..... 7896 tons = 49 pct
Fuel, ammunition, stores ......... 2830 tons = 18 pct
Miscellaneous weights ............ 3000 tons = 19 pct
-----
15966 tons = 100 pct

Estimated metacentric height, 3.2 ft

Displacement summary:

Light ship: 13136 tons
Standard displacement: 13512 tons
Normal service: 15966 tons
Full load: 17865 tons

Loading submergence 712 tons/foot

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.06

Shellfire needed to sink: 34124 lbs = 1115.8 x 3.9-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 4.6
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 71 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.11

Relative quality as a seaboat: 1.61

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.602
Sharpness coefficient: 0.40
Hull speed coefficient 'M' = 6.12
'Natural speed' for length = 22.4 knots
Power going to wave formation
at top speed: 49 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 46 percent

Relative accommodation and working space: 134 percent


Displacement factor: 235 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.94
(Structure weight per square
foot of hull surface: 199 lbs)

Relative longitudinal hull strength: 3.53
(for 20.0 ft average freeboard;
freeboard adjustment +3.4 ft)

Relative composite hull strength: 2.06

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

504.00 x 69.50 x 26.50; 20.00 -- Dimensions
0.60 -- Block coefficient
1925 -- Year laid down
22.15 / 10000 / 17.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
3000 tons -- Miscellaneous weights
++++++++++
4 x 3.94; 4; 2 -- Main battery; turrets; superfiring
:
8 x 5.10; 4 -- Secondary battery; turrets
:
12 x 1.57 -- Tertiary (QF/AA) battery
Gun-shields
:
8 x 0.98 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
8.00 / 0.00 / 0.00 / 0.00; 47 -- Belt armor; relative extent
1.00 / 2.50 -- Deck / CT
1.00 / 2.00 / 0.50 / 0.20 -- Battery armor


+++++++++++++++++++++++++++++++++++++++++++++++++++++++


For comparison, here are the stats for the Luzons as built:


Filipino Luzon-class Armored Cruiser, laid down 1901

Length, 504 ft x Beam, 69.5 ft x Depth, 26.5 ft
15966 tons normal displacement (13139 tons standard)

Main battery: 4 x 8.00-inch / 203mm (2 x 2)
Secondary battery: 14 x 6.00-inch / 152mm
QF battery: 18 x 3.00-inch / 76mm / 14-pdr

Weight of broadside: 2779 lbs

Main belt, 8.0 inches; bow and stern, 2.0 inches
Armor deck, average 2.0 inches
C.T., 8.0 inches

Battery armor:
Main, 9.0" / secondary, 3.0"
QF, 0.5" shields

Maximum speed for 20272 ihp = 20.00 knots
Approximate cruising radius, 4500 nm / 17 kts

Typical complement: 710-923


Estimated cost, $4.676 million (£1.169 million)

Remarks:

Relative extent of belt armor, 82 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.

Ship is roomy, with superior accommodation and working space.

Main deck secondary guns subject to being washed down
in a seaway.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 347 tons = 2 pct
Armor, total ..................... 2712 tons = 17 pct

Belt 1021 tons = 6 pct
Deck 922 tons = 6 pct
C.T. 109 tons = 1 pct
Armament 660 tons = 4 pct

Machinery ........................ 3119 tons = 20 pct
Hull and fittings; equipment ..... 6385 tons = 40 pct
Fuel, ammunition, stores ......... 3378 tons = 21 pct
Miscellaneous weights ............ 25 tons = 0 pct
-----
15966 tons = 100 pct

Estimated metacentric height, 4.9 ft

Displacement summary:

Light ship: 12588 tons
Standard displacement: 13139 tons
Normal service: 15966 tons
Full load: 18163 tons

Loading submergence 712 tons/foot

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.34

Shellfire needed to sink: 21594 lbs = 84.3 x 8.0-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 2.3
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 77 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.38

Relative quality as a seaboat: 1.92

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.602
Sharpness coefficient: 0.40
Hull speed coefficient 'M' = 6.12
'Natural speed' for length = 22.4 knots
Power going to wave formation
at top speed: 44 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 81 percent

Relative accommodation and working space: 134 percent


Displacement factor: 137 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.37
(Structure weight per square
foot of hull surface: 161 lbs)

Relative longitudinal hull strength: 2.61
(for 20.0 ft average freeboard;
freeboard adjustment +3.4 ft)

Relative composite hull strength: 1.46

+++++++++++++++++++++++++

Normally I would say her speed as an aircraft carrier is too slow but given the fact that shes converted from a former American 1st class cruiser and that she is the first carrier for the Philipino navy this seems realistic.

Perhaps for realism purposes you would be wise to seek experience from other nations who posess carriers already. Britain, the U.S. Atlantis, Japan and Italy would seem to be the trend setters while France, Russia, Iberia, India and the SAE are quickly catching up.

I think realisticaly though the Mindoro would only be able to carry 20/25 aircraft given her size and the fact that shes a conversion.

Considering she would have been running reciprocating engines before, theres going to be a lot of space in the engine rooms.

Also needed to be considered is that she is a pre-dread and as thus has no TDS whatsoever. Theres not a great chance that she'd take 1-2 torpedo hits. Spring* calculates for 20" torps so with most navies shipping 21" or even 600mm she'll sink quickly.

As a training ship for a completely purpose built carrier she would be ok, however I wouldn't invest too much in her. Keep the engines the same but take the main turrets off and build a temporary flying deck full length at about 1-2 decks fup from the main deck.

Does the Philipino navy actually have any aircraft? The RM is in a bad state with mainly aging flying boats but there are some new aircraft on the way(both real and fictional).

The Philipines could also look to other nations for help as well. Quite a few countries have carriers now. Italy has 1 25,000t conversion and will be laying down 2 much smaller, useful carriers in 1925 as well.

Well, I figured that since it'll be a reconstruction, a (minimal) TDS might be installed.

She will be a 'temporary' carrier, pending the first 'real' carrier to be laid down in 1933; but it is also intended that she be able to serve as a light carrier - what might today be called a 'littoral combat carrier' - helping, among other things, to defend against those pesky pirates.

I'll tweak the air group down to about 32 aircraft or so; I figure they'll probably be U.S. types; although, what are the Russians using?

I'd agree with RA's assessment - leave the engines be, since the two knots of speed will make little difference anyway.

Perhaps Commodore Garcia should visit India's small carrier Otta while he's at the Akbar events. India is operating Baagh fighters and Dhairya scout-bombers off of her, and is developing a torpedo-bomber for testing.

There are plenty of aircraft on offer in the world. Italy is operating a navalised Fiat CR.1 which is very fast, and a fictional torpedo bomber.

Is anyone interested in buying any aircraft?

For long range patol, Italy can offer 2 world-beaters.

The Savoia-Marchetti S.55


The Dornier 'Wal'

The engines have to be changed; the old ones are worn out (OOC: and if I set SpringStyle to a date of 1901, to keep the old engines, the armament doesn't work out right...).

As for aircraft: the Philippines Air Force uses mostly American types, and has been quite satisfied with them, so there is pressure for the Navy to also buy American.

The Philippines gratefully accepts the invitation of the Indian Navy to tour their carrier.


Does this design look better? Less change, more armour, and a more realistic armament.

PRS Mindoro, aircraft carrier conversion, laid down 1925

Length, 504 ft x Beam, 69.5 ft x Depth, 26.5 ft
15966 tons normal displacement (14115 tons standard)

Air group: 32 aircraft

Main battery: 8 x 3.94-inch / 100mm
Secondary battery: 16 x 1.57-inch / 40mm
AA battery: 8 x 0.98-inch / 25mm
Light battery: 4 x 0.54-inch / 13.7mm

Weight of broadside: 280 lbs

Main belt, 8.0 inches; ends unarmored
Armor deck, average 1.0 inches
C.T., 2.5 inches

Battery armor:
Main, 2.0" shields / secondary, 0.5" shields
AA, 0.2" shields

Maximum speed for 20272 shp = 20.00 knots
Approximate cruising radius, 7500 nm / 17 kts

Typical complement: 710-923


Estimated cost, $7.901 million (£1.975 million)

Remarks:

Relative extent of belt armor, 82 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.

Ship is roomy, with superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 35 tons = 0 pct
Armor, total ..................... 1437 tons = 9 pct

Belt 914 tons = 6 pct
Deck 461 tons = 3 pct
C.T. 34 tons = 0 pct
Armament 28 tons = 0 pct

Machinery ........................ 658 tons = 4 pct
Hull and fittings; equipment ..... 9143 tons = 57 pct
Fuel, ammunition, stores ......... 2193 tons = 14 pct
Miscellaneous weights ............ 2500 tons = 16 pct
-----
15966 tons = 100 pct

Estimated metacentric height, 3.6 ft

Displacement summary:

Light ship: 13773 tons
Standard displacement: 14115 tons
Normal service: 15966 tons
Full load: 17382 tons

Loading submergence 712 tons/foot

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.11

Shellfire needed to sink: 47487 lbs = 1552.8 x 3.9-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 6.6
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 70 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.02

Relative quality as a seaboat: 1.85

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.60
Sharpness coefficient: 0.40
Hull speed coefficient 'M' = 6.12
'Natural speed' for length = 22.4 knots
Power going to wave formation
at top speed: 44 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 34 percent

Relative accommodation and working space: 134 percent


Displacement factor: 289 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 2.35
(Structure weight per square
foot of hull surface: 230 lbs)

Relative longitudinal hull strength: 4.13
(for 20.0 ft average freeboard;
freeboard adjustment +3.4 ft)

Relative composite hull strength: 2.49

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

504.00 x 69.50 x 26.50; 20.00 -- Dimensions
0.60 -- Block coefficient
1925 -- Year laid down
20.00 / 7500 / 17.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
2500 tons -- Miscellaneous weights
++++++++++
8 x 3.94; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
16 x 1.57; 0 -- Secondary battery; turrets
Gun-shields
:
8 x 0.98 -- Tertiary (QF/AA) battery
Gun-shields
:
4 x 0.54 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
8.00 / 0.00 / 0.00 / 0.00; 82 -- Belt armor; relative extent
1.00 / 2.50 -- Deck / CT
2.00 / 0.50 / 0.20 / 0.00 -- Battery armor


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Compared, again, to the original:


Filipino Luzon-class Armored Cruiser, laid down 1901

Length, 504 ft x Beam, 69.5 ft x Depth, 26.5 ft
15966 tons normal displacement (13139 tons standard)

Main battery: 4 x 8.00-inch / 203mm (2 x 2)
Secondary battery: 14 x 6.00-inch / 152mm
QF battery: 18 x 3.00-inch / 76mm / 14-pdr

Weight of broadside: 2779 lbs

Main belt, 8.0 inches; bow and stern, 2.0 inches
Armor deck, average 2.0 inches
C.T., 8.0 inches

Battery armor:
Main, 9.0" / secondary, 3.0"
QF, 0.5" shields

Maximum speed for 20272 ihp = 20.00 knots
Approximate cruising radius, 4500 nm / 17 kts

Typical complement: 710-923


Estimated cost, $4.676 million (£1.169 million)

Remarks:

Relative extent of belt armor, 82 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.

Ship is roomy, with superior accommodation and working space.

Main deck secondary guns subject to being washed down
in a seaway.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 347 tons = 2 pct
Armor, total ..................... 2712 tons = 17 pct

Belt 1021 tons = 6 pct
Deck 922 tons = 6 pct
C.T. 109 tons = 1 pct
Armament 660 tons = 4 pct

Machinery ........................ 3119 tons = 20 pct
Hull and fittings; equipment ..... 6385 tons = 40 pct
Fuel, ammunition, stores ......... 3378 tons = 21 pct
Miscellaneous weights ............ 25 tons = 0 pct
-----
15966 tons = 100 pct

Estimated metacentric height, 4.9 ft

Displacement summary:

Light ship: 12588 tons
Standard displacement: 13139 tons
Normal service: 15966 tons
Full load: 18163 tons

Loading submergence 712 tons/foot

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.34

Shellfire needed to sink: 21594 lbs = 84.3 x 8.0-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 2.3
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 77 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.38

Relative quality as a seaboat: 1.92

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.602
Sharpness coefficient: 0.40
Hull speed coefficient 'M' = 6.12
'Natural speed' for length = 22.4 knots
Power going to wave formation
at top speed: 44 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 81 percent

Relative accommodation and working space: 134 percent


Displacement factor: 137 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.37
(Structure weight per square
foot of hull surface: 161 lbs)

Relative longitudinal hull strength: 2.61
(for 20.0 ft average freeboard;
freeboard adjustment +3.4 ft)

Relative composite hull strength: 1.46

+++++++++++++++++++++++++

The philipines is in luck when it comes to touring carriers at the Akbar events, in addition to India's Otta, Atlantis will also have the older Siboney, perhaps France, Russia and Italy will also send some carriers as well. I would have sent Arrogant but it seems she would not be able to make it to the event on time so soon after her completion.

Quoted

what are the Russians using?

Russian aviation is based on domestically developed airframes and weapons, using French engines built under licence. 1921-vintage aircraft now coming to the end of serial production are described here.

New models are coming into service, based on new developments in engine technology, airframe design, and weaponry.

A true 'flat-top', with no island...

PRS Mindoro, aircraft carrier conversion, converted 1925

Length, 504 ft x Beam, 69.5 ft x Depth, 26.5 ft
15966 tons normal displacement (14130 tons standard)

Air group: 32 aircraft

Main battery: 4 x 3.94-inch / 100mm
Secondary battery: 12 x 1.57-inch / 40mm
AA battery: 4 x 0.98-inch / 25mm
Light battery: 4 x 0.54-inch / 13.7mm

Weight of broadside: 148 lbs

Main belt, 8.0 inches; ends unarmored
Armor deck, average 1.0 inches

Battery armor:
Main, 2.0" shields / secondary, 0.5" shields


Maximum speed for 20272 shp = 20.00 knots
Approximate cruising radius, 7500 nm / 17 kts

Typical complement: 710-923


Estimated cost, $7.732 million (£1.933 million)

Remarks:

Relative extent of belt armor, 34 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.

Ship is roomy, with superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 18 tons = 0 pct
Armor, total ..................... 855 tons = 5 pct

Belt 379 tons = 2 pct
Deck 461 tons = 3 pct
Armament 15 tons = 0 pct

Machinery ........................ 658 tons = 4 pct
Hull and fittings; equipment ..... 9767 tons = 61 pct
Fuel, ammunition, stores ......... 2167 tons = 14 pct
Miscellaneous weights ............ 2500 tons = 16 pct
-----
15966 tons = 100 pct

Estimated metacentric height, 3.6 ft

Displacement summary:

Light ship: 13799 tons
Standard displacement: 14130 tons
Normal service: 15966 tons
Full load: 17370 tons

Loading submergence 712 tons/foot

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.11

Shellfire needed to sink: 48608 lbs = 1589.5 x 3.9-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 6.8
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 71 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.01

Relative quality as a seaboat: 1.83

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.602
Sharpness coefficient: 0.40
Hull speed coefficient 'M' = 6.12
'Natural speed' for length = 22.4 knots
Power going to wave formation
at top speed: 44 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 33 percent

Relative accommodation and working space: 134 percent


Displacement factor: 331 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 2.54
(Structure weight per square
foot of hull surface: 246 lbs)

Relative longitudinal hull strength: 4.42
(for 20.0 ft average freeboard;
freeboard adjustment +3.4 ft)

Relative composite hull strength: 2.68

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

504.00 x 69.50 x 26.50; 20.00 -- Dimensions
0.60 -- Block coefficient
1925 -- Year laid down
20.00 / 7500 / 17.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
2500 tons -- Miscellaneous weights
++++++++++
4 x 3.94; 0 -- Main battery; turrets
Gun-shields
:
12 x 1.57; 0 -- Secondary battery; turrets
Gun-shields
:
4 x 0.98 -- Tertiary (QF/AA) battery
:
4 x 0.54 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
8.00 / 0.00 / 0.00 / 0.00; 34 -- Belt armor; relative extent
1.00 / 0.00 -- Deck / CT
2.00 / 0.50 / 0.00 / 0.00 -- Battery armor


+++++++++++++++++++++++++++++++++++++++++++++++++++++++