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1

Tuesday, May 31st 2005, 8:14pm

Battleship/-cruiser design studies

With approximatly 70,000 tons of material scheduled to be available, the Marina de Filipinas design office is beginning to consider options for the 1932 capital ship programme.

One of the first designs to be considered is this one:

(this was actually the winner of one of my RFI comps on the Warships 1 design board many moons ago; unfortunatly I can't remember who the designer was. :( )


PRS Boracay, Filipino battlecruiser, laid down 1932

Displacement:
33,687 t light; 35,313 t standard; 39,436 t normal; 42,576 t full load

Dimensions: Length overall / water x beam x draught
836.61 ft / 803.81 ft x 98.43 ft x 30.18 ft (normal load)
255.00 m / 245.00 m x 30.00 m x 9.20 m

Armament:
6 - 13.78" / 350 mm guns (3x2 guns), 1,308.20lbs / 593.39kg shells, 1915 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
14 - 5.12" / 130 mm guns (7x2 guns), 68.34lbs / 31.00kg shells, 1932 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships, 1 raised mount aft - superfiring
24 - 3.94" / 100 mm guns (12x2 guns), 30.51lbs / 13.84kg shells, 1932 Model
Anti-aircraft guns in deck mounts with hoists
on side, evenly spread, 8 raised mounts
32 - 1.57" / 40.0 mm guns (8x4 guns), 1.98lbs / 0.90kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
32 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread, 24 raised mounts

Weight of broadside 9.617 lbs / 4.362 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 12.6" / 320 mm 492.13 ft / 150.00 m 11.52 ft / 3.51 m
Ends: Unarmoured
Main Belt covers 94% of normal length

- Torpedo Bulkhead:
1.97" / 50 mm 492.13 ft / 150,00 m 24.44 ft / 7,45 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 12.6" / 320 mm 8.86" / 225 mm 12.6" / 320 mm
2nd: 1.97" / 50 mm 1.18" / 30 mm 1.97" / 50 mm
3rd: 1.18" / 30 mm - -
4th: 0.79" / 20 mm - -
5th: 0.79" / 20 mm - -

- Armour deck: 4.72" / 120 mm, Conning tower: 8.86" / 225 mm

Machinery:
Oil fired boilers, steam turbines,
Electric drive, 3 shafts, 204,462 shp / 152,528 Kw = 34.00 kts
Range 15,000nm at 15.00 kts (Bunkerage = 7,421 tons)

Complement:
1,398 - 1,818

Cost:
£13.780 million / $55.122 million

Distribution of weights at normal displacement:
Armament: 1,200 tons, 3.0%
Armour: 11,843 tons, 30.0%
- Belts: 3,074 tons, 7.8%
- Torpedo bulkhead: 876 tons, 2.2%
- Armament: 2,510 tons, 6.4%
- Armour Deck: 5,161 tons, 13.1%
- Conning Tower: 222 tons, 0.6%
Machinery: 6,035 tons, 15.3%
Hull, fittings & equipment: 14,460 tons, 36.7%
Fuel, ammunition & stores: 5,749 tons, 14.6%
Miscellaneous weights: 150 tons, 0.4%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
47,902 lbs / 21,728 Kg = 36.6 x 13.8 " / 350 mm shells or 5.8 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 6.6 ft / 2.0 m
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.45
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.578
Length to Beam Ratio: 8.17 : 1
'Natural speed' for length: 32.59 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 36.52 degrees
Stern overhang: 9.84 ft / 3.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.00 ft / 9.45 m
- Forecastle (20%): 25.59 ft / 7.80 m
- Mid (50%): 25.59 ft / 7.80 m
- Quarterdeck (15%): 25.59 ft / 7.80 m
- Stern: 25.59 ft / 7.80 m
- Average freeboard: 26.02 ft / 7.93 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 93.4%
- Above water (accommodation/working, high = better): 205.9%
Waterplane Area: 59,049 Square feet or 5,486 Square metres
Displacement factor (Displacement / loading): 117%
Structure weight / hull surface area: 172 lbs/sq ft or 842 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.26
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

2

Tuesday, May 31st 2005, 8:30pm

Damn! That's faster than my battleship!!

3

Tuesday, May 31st 2005, 8:33pm

I think the secondary and tertiary batteries are rather excessive - particularly if the 130s are dual-purpose as the design notes. Yank a few out and beef up the deck armor or something.

On the whole, I'd suggest that a battleships is more needed than a battlecruiser, considering you already have two Samals at the time.

4

Tuesday, May 31st 2005, 8:55pm

A bit light on the firepower. I have a nice 23,000ton design with 6x381 or 9x381 on 28,000t.

Maybe Russia will build Stalingrad? 9x305/60 guns and 36knt speed.

I'm not sure that the speed is useful. I'll just drop 30x500lb bombs on her from a single Caproni 90. BTW, I noted that I can actually launch a strategic air war with this bomber. How to bomb the crap out of Manila whilst flying from Siam :)

Basically, combined operations are the norm. What fits in with everything else?

5

Tuesday, May 31st 2005, 9:02pm

Making note: Start the development of the Kaguya High Performance Fighter Aircraft...

6

Tuesday, May 31st 2005, 9:16pm

You might be able to drop 30 bombs from your bomber, but I doubt your crews can hit very much, as historically, level bombing was not very accurate.

7

Tuesday, May 31st 2005, 9:26pm

In this era (and I am talking about the late 1920s), the more bombs you drop, the bigger the chance is that you will get a hit, even if level bombing is not accurate...

8

Tuesday, May 31st 2005, 9:33pm

Do keep in mind that this is an early concept design; the final design...or designs...will almost certainly be quite different.

9

Tuesday, May 31st 2005, 9:40pm

Key work "a hit". But against 12 cm of deck armor?

10

Tuesday, May 31st 2005, 10:46pm

Enough above the armored deck to damage. You won't sink her, but still...

11

Tuesday, May 31st 2005, 11:05pm

But with the increadible number of AAA and DP batteries...it is even less likely said bomber would be able to get even one hit. Even in larger numbers, just the sheer volume of metal flying through the air should be able to cut several aircraft to pieces.

12

Tuesday, May 31st 2005, 11:18pm

35,000 tons for a cruiser killer??

because that will be all she'll be good for.

And she won't be done until 1936, by which time land-based naval patrol aircraft will make her a fugitive without refuge.

13

Wednesday, June 1st 2005, 12:55am

Either that or she is one hell of a big and fast Pacific raider.

14

Wednesday, June 1st 2005, 1:49am

ACME co. presents its Custom Big Bang Cruiser for consideration.
It uses the latest Triple Strength Battleship Armor.

PRS Willie E Coyote, Philippines Cruzero de Batalla laid down 1932

Displacement:
31,153 t light; 35,528 t standard; 36,828 t normal; 37,868 t full load

Dimensions: Length overall / water x beam x draught
840.00 ft / 840.00 ft x 93.00 ft x 30.00 ft (normal load)
256.03 m / 256.03 m x 28.35 m x 9.14 m

Armament:
18 - 12.60" / 320 mm guns (5x4 guns), 1,000.19lbs / 453.68kg shells, 1932 Model
Breech loading guns in turrets (on barbettes)
on centreline, evenly spread, 2 raised mounts
28 - 5.12" / 130 mm guns (14x2 guns), 67.11lbs / 30.44kg shells, 1932 Model
Dual purpose guns in turrets (on barbettes)
on side, evenly spread, 4 raised mounts
36 - 3.94" / 100 mm guns (18x2 guns), 30.58lbs / 13.87kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
48 - 1.57" / 39.9 mm guns in single mounts, 1.93lbs / 0.88kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
48 - 0.98" / 25.0 mm guns (4x12 guns), 0.48lbs / 0.22kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 21,099 lbs / 9,570 kg
Shells per gun, main battery: 300
18 - 26.0" / 660.4 mm above water torpedoes, 18 - 26.0" / 660.4 mm submerged torpedo tubes
Giant slingshot, fires 500lb bombs
2 ACME MkII Deathrays.

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 546.00 ft / 166.42 m 11.70 ft / 3.57 m
Ends: Unarmoured
Main Belt covers 100 % of normal length
Main belt does not fully cover magazines and engineering spaces

- Torpedo Bulkhead:
1.00" / 25 mm 546.00 ft / 166.42 m 27.54 ft / 8.39 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 6.00" / 152 mm 6.00" / 152 mm 6.00" / 152 mm
2nd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm

- Armour deck: 1.00" / 25 mm, Conning tower: 1.00" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 236,896 shp / 176,724 Kw = 36.00 kts
Range 10,000nm at 10.00 kts
Bunker at max displacement = 2,340 tons

Complement:
1,329 - 1,728

Cost:
£19.476 million / $77.903 million

Distribution of weights at normal displacement:
Armament: 2,637 tons, 7.2 %
Armour: 5,753 tons, 15.6 %
- Belts: 1,614 tons, 4.4 %
- Torpedo bulkhead: 556 tons, 1.5 %
- Armament: 2,509 tons, 6.8 %
- Armour Deck: 1,050 tons, 2.9 %
- Conning Tower: 24 tons, 0.1 %
Machinery: 6,992 tons, 19.0 %
Hull, fittings & equipment: 14,771 tons, 40.1 %
Fuel, ammunition & stores: 5,675 tons, 15.4 %
Miscellaneous weights: 1,000 tons, 2.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14,643 lbs / 6,642 Kg = 14.6 x 12.6 " / 320 mm shells or 2.1 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 5.5 ft / 1.7 m
Roll period: 16.7 seconds
Steadiness - As gun platform (Average = 50 %): 34 %
- Recoil effect (Restricted arc if above 1.00): 0.90
Seaboat quality (Average = 1.00): 0.47

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.550
Length to Beam Ratio: 9.03 : 1
'Natural speed' for length: 33.15 kts
Power going to wave formation at top speed: 57 %
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: 32.00 ft / 9.75 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (50 %): 20.00 ft / 6.10 m
- Quarterdeck (15 %): 20.00 ft / 6.10 m
- Stern: 20.00 ft / 6.10 m
- Average freeboard: 20.96 ft / 6.39 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 180.7 %
- Above water (accommodation/working, high = better): 123.1 %
Waterplane Area: 56,759 Square feet or 5,273 Square metres
Displacement factor (Displacement / loading): 88 %
Structure weight / hull surface area: 186 lbs/sq ft or 909 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 0.78
- Overall: 0.81
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Caution: Lacks seaworthiness - very limited seakeeping ability

15

Wednesday, June 1st 2005, 2:31am

Quoted

Originally posted by Desertfox
ACME co. presents its Custom Big Bang Cruiser for consideration.
It uses the latest Triple Strength Battleship Armor.

PRS Willie E Coyote, Philippines Cruzero de Batalla laid down 1932


18 - 12.60" / 320 mm guns (5x4 guns), 1,000.19lbs / 453.68kg shells, 1932 Model
Breech loading guns in turrets (on barbettes)
on centreline, evenly spread, 2 raised mounts


5 X 4 = 20 guns, not 18!! Where did the other 2 come from?????

And 36 knots??.......semi displacement or planing hull!!!!

16

Wednesday, June 1st 2005, 3:07am

Yes, he'll fit in here just fine

Of course...

Quoted


Armour deck: 1.00" / 25 mm

(...)

Seaboat quality (Average = 1.00): 0.47

(...)

Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 0.78
- Overall: 0.81


...would ensure that HMS Road Runner would win. ^_^

17

Wednesday, June 1st 2005, 4:20am

Woops its 4x4.

Its ACME it use super secret propulsion and hull to reach 36kts. Also since it uses Triple strength armor, the armor must be multiplyed by 3.

Anyway its a Philippino ship its designed to blo....err use unconventional tactics to destroy enemy ships.

18

Wednesday, June 1st 2005, 5:18am

"Ramming speed, Mr. Diego. Set all weapons to 'path of least resistance'."

HoOmAn

Keeper of the Sacred Block Coefficient

  • Send private message

19

Wednesday, June 1st 2005, 10:29am

The question to answer is: What´s the job of a Filipino BB?

If you´ve an answer you can go ahead with: What features are necessary to achieve the goal?

I see no reason why the Phillis should build a design as posted but perhaps I misinterpret the navy´s role in the region....

20

Wednesday, June 1st 2005, 1:16pm

Conflicting design ideas

I'm not going to actually build that design - it's simply an early step in the creative process; an example of the MdF Design Office's work.

Quoted

What´s the job of a Filipino BB?

Ay, there's the rub.

I have the materials, infrastructure, and Treaty room to build a pair of 30-35,000 ton ships, which would make a nice matched pair for First Battle Squadron and a nice addition to the SATSUMA Line of Battle in a conflict, in addition to having perhaps the greatest propaganda value (always a selling point for *spoiler deleted* ;-) )

However, perhaps a pair of ~20,000-ton panzerschiffen would be better? After all, India and Japan have a pretty nice set of battleships already, and in the event of the Philippines being in a major war, some Pacific Raiders could come in handy...

Or perhaps even a pair of 15,000-ton supercruisers to escort my aircraft carrier squadron (which, if things Go According To Plan, will consist of three ships)?

Decisions, decisions...