WesWorld

Memnon class Atlantean Battleship laid down 1929

Memnon, Philomedes


*yes I know those additional 20mm mounts are missing aft!*

Displacement:
38,537 t light; 40,906 t standard; 45,750 t normal; 49,625 t full load

Dimensions: Length overall / water x beam x draught
745.94 ft / 732.00 ft x 108.00 ft x 32.15 ft (normal load)
227.36 m / 223.11 m x 32.92 m x 9.80 m

Armament:
9 - 15.00" / 381 mm guns (3x3 guns), 1,687.50lbs / 765.44kg shells, 1929 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
15 - 6.00" / 152 mm guns (5x3 guns), 108.00lbs / 48.99kg shells, 1929 Model
Breech loading guns in turrets (on barbettes)
on side, all amidships, 1 raised mount - superfiring
16 - 3.00" / 76.2 mm guns (8x2 guns), 13.50lbs / 6.12kg shells, 1929 Model
Anti-aircraft guns in deck mounts with hoists
on side, evenly spread, all raised mounts
20 - 1.57" / 39.9 mm guns (10x2 guns), 1.93lbs / 0.88kg shells, 1929 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
24 - 0.79" / 20.0 mm guns (8x3 guns), 0.24lbs / 0.11kg shells, 1929 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 17,068 lbs / 7,742 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.0" / 406 mm 390.00 ft / 118.87 m 14.00 ft / 4.27 m
Ends: Unarmoured
Main Belt covers 82 % of normal length

- Torpedo Bulkhead:
2.35" / 60 mm 390.00 ft / 118.87 m 28.00 ft / 8.53 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 16.5" / 420 mm 11.0" / 280 mm 14.0" / 356 mm
2nd: 3.94" / 100 mm 2.35" / 60 mm 2.76" / 70 mm
3rd: 1.00" / 25 mm 1.00" / 25 mm -

- Armour deck: 6.25" / 159 mm, Conning tower: 16.00" / 406 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 134,048 shp / 100,000 Kw = 28.23 kts
Range 15,000nm at 15.00 kts
Bunker at max displacement = 8,719 tons

Complement:
1,563 - 2,033

Cost:
£14.869 million / $59.477 million

Distribution of weights at normal displacement:
Armament: 2,134 tons, 4.7 %
Armour: 15,916 tons, 34.8 %
- Belts: 3,981 tons, 8.7 %
- Torpedo bulkhead: 949 tons, 2.1 %
- Armament: 3,670 tons, 8.0 %
- Armour Deck: 6,875 tons, 15.0 %
- Conning Tower: 441 tons, 1.0 %
Machinery: 4,117 tons, 9.0 %
Hull, fittings & equipment: 16,221 tons, 35.5 %
Fuel, ammunition & stores: 7,212 tons, 15.8 %
Miscellaneous weights: 150 tons, 0.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
63,897 lbs / 28,983 Kg = 37.9 x 15.0 " / 381 mm shells or 10.0 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 6.1 ft / 1.9 m
Roll period: 18.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.63
Seaboat quality (Average = 1.00): 1.11

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.630
Length to Beam Ratio: 6.78 : 1
'Natural speed' for length: 27.06 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 63
Bow angle (Positive = bow angles forward): 17.00 degrees
Stern overhang: 4.40 ft / 1.34 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.22 ft / 9.52 m
- Forecastle (21 %): 22.00 ft / 6.71 m
- Mid (50 %): 22.00 ft / 6.71 m
- Quarterdeck (22 %): 22.00 ft / 6.71 m
- Stern: 22.00 ft / 6.71 m
- Average freeboard: 22.77 ft / 6.94 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 81.4 %
- Above water (accommodation/working, high = better): 159.4 %
Waterplane Area: 59,456 Square feet or 5,524 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 199 lbs/sq ft or 971 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.36
- 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
----------------------------------------------------------------------
Hector, Atlantean Heavy Cruiser laid down 1928
Hector, Apollo

Displacement:
10,839 t light; 11,329 t standard; 12,432 t normal; 13,315 t full load

Dimensions: Length overall / water x beam x draught
595.92 ft / 585.00 ft x 66.00 ft x 24.50 ft (normal load)
181.64 m / 178.31 m x 20.12 m x 7.47 m

Armament:
9 - 8.00" / 203 mm guns (3x3 guns), 256.00lbs / 116.12kg shells, 1928 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 4.50" / 114 mm guns (4x2 guns), 45.56lbs / 20.67kg shells, 1928 Model
Dual purpose guns in deck mounts
on side, all amidships
2 - 4.50" / 114 mm guns (1x2 guns), 45.56lbs / 20.67kg shells, 1928 Model
Dual purpose guns in deck mount
on centreline aft, all raised guns - superfiring
8 - 1.57" / 39.9 mm guns (4x2 guns), 1.93lbs / 0.88kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
18 - 0.79" / 19.9 mm guns (6x3 guns), 0.24lbs / 0.11kg shells, 1928 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 2,779 lbs / 1,261 kg
Shells per gun, main battery: 150
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.70" / 119 mm 390.00 ft / 118.87 m 10.00 ft / 3.05 m
Ends: Unarmoured
Main Belt covers 103 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.50" / 140 mm 3.92" / 100 mm 3.92" / 100 mm
2nd: 1.00" / 25 mm - -
3rd: 1.00" / 25 mm - -

- Armour deck: 2.35" / 60 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 96,795 shp / 72,209 Kw = 32.00 kts
Range 12,000nm at 12.00 kts
Bunker at max displacement = 1,986 tons

Complement:
588 - 765

Cost:
£4.174 million / $16.695 million

Distribution of weights at normal displacement:
Armament: 347 tons, 2.8 %
Armour: 2,389 tons, 19.2 %
- Belts: 766 tons, 6.2 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 507 tons, 4.1 %
- Armour Deck: 1,080 tons, 8.7 %
- Conning Tower: 36 tons, 0.3 %
Machinery: 3,014 tons, 24.2 %
Hull, fittings & equipment: 4,939 tons, 39.7 %
Fuel, ammunition & stores: 1,593 tons, 12.8 %
Miscellaneous weights: 150 tons, 1.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13,550 lbs / 6,146 Kg = 52.9 x 8.0 " / 203 mm shells or 1.7 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 2.9 ft / 0.9 m
Roll period: 16.1 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.65
Seaboat quality (Average = 1.00): 1.15

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.460
Length to Beam Ratio: 8.86 : 1
'Natural speed' for length: 24.19 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 62
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.00 ft / 9.14 m
- Forecastle (20 %): 26.00 ft / 7.92 m
- Mid (45 %): 26.00 ft / 7.92 m (18.00 ft / 5.49 m aft of break)
- Quarterdeck (20 %): 18.00 ft / 5.49 m
- Stern: 19.00 ft / 5.79 m
- Average freeboard: 22.02 ft / 6.71 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 101.9 %
- Above water (accommodation/working, high = better): 147.1 %
Waterplane Area: 24,834 Square feet or 2,307 Square metres
Displacement factor (Displacement / loading): 110 %
Structure weight / hull surface area: 119 lbs/sq ft or 582 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.85
- 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
----------------------------------------------------------------------
MS-26 class, Atlantean Mine warfare vessel laid down 1929



Displacement:
674 t light; 694 t standard; 782 t normal; 853 t full load

Dimensions: Length overall / water x beam x draught
229.73 ft / 227.00 ft x 26.00 ft x 8.00 ft (normal load)
70.02 m / 69.19 m x 7.92 m x 2.44 m

Armament:
2 - 3.00" / 76.2 mm guns (1x2 guns), 13.50lbs / 6.12kg shells, 1929 Model
Dual purpose guns in deck mount
on centreline forward
2 - 1.57" / 39.9 mm guns (1x2 guns), 1.93lbs / 0.88kg shells, 1929 Model
Anti-aircraft guns in deck mount
on centreline aft
2 - 1.00" / 25.4 mm guns (1x2 guns), 0.50lbs / 0.23kg shells, 1929 Model
Anti-aircraft guns in deck mount
on centreline forward, all raised guns - superfiring
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1929 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 32 lbs / 15 kg
Shells per gun, main battery: 220

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -
2nd: 0.79" / 20 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 1,912 shp / 1,426 Kw = 16.50 kts
Range 5,000nm at 12.00 kts
Bunker at max displacement = 159 tons

Complement:
73 - 96

Cost:
£0.141 million / $0.563 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.5 %
Armour: 5 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 59 tons, 7.5 %
Hull, fittings & equipment: 427 tons, 54.6 %
Fuel, ammunition & stores: 108 tons, 13.8 %
Miscellaneous weights: 180 tons, 23.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,661 lbs / 753 Kg = 123.0 x 3.0 " / 76 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 0.7 ft / 0.2 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.06
Seaboat quality (Average = 1.00): 1.34

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.580
Length to Beam Ratio: 8.73 : 1
'Natural speed' for length: 15.07 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 52
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 10.20 ft / 3.11 m
- Forecastle (20 %): 10.00 ft / 3.05 m
- Mid (50 %): 8.00 ft / 2.44 m
- Quarterdeck (15 %): 6.00 ft / 1.83 m (8.00 ft / 2.44 m before break)
- Stern: 6.00 ft / 1.83 m
- Average freeboard: 8.42 ft / 2.57 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 54.6 %
- Above water (accommodation/working, high = better): 93.5 %
Waterplane Area: 4,237 Square feet or 394 Square metres
Displacement factor (Displacement / loading): 234 %
Structure weight / hull surface area: 66 lbs/sq ft or 321 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.82
- Longitudinal: 2.43
- Overall: 1.87
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

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A variety of light vessels are being produced by Atlantis. The Type 1 class CMB is already in production while the MTB-1 class vessels will be built later this year. The Type 1 motor launch is also a new design that will begin production this year, in addition a minelayer version has been designed.


Type 1 class Coastal Motor Boat
(Based on British type 3 C.M.B.)

CMB-1 through 121 (1928/29/30)

Demensions 55x11x3
displacement:15 tons
Armament 1x20mm forward, 2x0.50 cal mg aft of
bridge, 2x18"TT, 4 D.C.
Machinery 2x 500 hp Roth petrol motor
speed 35 knots
Designed to operate primarily in the Taurian Sea, Caribbean and Sea of Marmara

MTB-1 through 61 (1929)

Demensions: 70x19x5
displacement: 35 tons
Armament: 2x20mm, 2x0.50 cal mg, 4x18"TT, 6 D.C.
Machinery: Batch 1, 6 ships, 3x 1200 hp Packard petrol motors
Batch 2, 6 ships, 3x 1200 hp Roth petrol motors
Speed: 40/41 knots

Type 1 Motor launch
Demensions 110x17.5x4.6
displacement:60 tons
Armament 1x40mm forward, 2x20mm 4x0.50 cal mg, 12 D.C.
Machinery 4x 500 hp Roth petrol motor
speed 25 knots

Type 1 Motor launch, mine layer version
Demensions 110x17.5x4.6
displacement:68 tons
Armament 1x40mm forward, 2x20mm 2x0.50 cal mg, 6 mines
Machinery 4x 500 hp Roth petrol motor
speed 24 knots

Like your designs Wes. The way the stern looks, you might as well throw a transom on the MS-26 design...

You have no idea how long it took me to get a BB design that looked good once drawn!!

As for the transom, not sure, allthough early to mid 1929 is not really jumping the gun on the 1930 rule too much I suppose. If its generally accepted she should recieve a transom then maybe then I can modify her...

Got to be careful with transoms and mines.....

Quoted

Got to be careful with transoms and mines.....

At times one has to take a few risks...
One takes risks by letting crew members smoke in the Magazines (for a Filipino-style *KABOOOM*) or by letting some idiot fly his plane around a munitions factory (for a Japanese-style *KABOOOOOOOOM*).

Quoted

As for the transom, not sure, allthough early to mid 1929 is not really jumping the gun on the 1930 rule too much I suppose. If its generally accepted she should recieve a transom then maybe then I can modify her...

Seeing how the Overall Hull Strength is 1.87 it's not like you're going to take advantage of that feature...

Nice battleship there! Mighty mean-looking...
;-)

...and with a name like Memnon it gives me leeway with nicknames from the crew.

Walter, you make a good point about the possibility of a transom not really being a benifit, aside from esthetically.

The drag from the transome stern might make your mines come back to you - keep that in mind....

Btw, why´s your MS 2cm too long for a type 1 slip/dock?

IIRC a type 0 slip/drydock is 230 feet long while MS-26 is 229.73 feet long including bow rake.

As for the mines and the transom, yeah thats what I've heard somewhere.....if thats really the case shes good the way she is.

Memnon's an impressive ship, particularly in her armor plate and an excellent secondary battery. I also like the fact that she's carrying a reasonable for the time AA battery.

Somebody's been watching "The Scorpion King", methinks.

I'm not real keen on the cruiser's dimensions. She's got a real deep draught and a low block-co-efficient. Vadodara's only 6.6 meters and 0.48 by comparison, for a similar-sized ship.

I also find the ranges a bit puzzling. Atlantis' usual operating area isn't really that vast so I wouldn't think 15000 at 15 knots would be necessary for a BB. Yet 12000 at 12 knots seems low if the cruisers are supposed to accompany carriers that like to move fast.

Not to be a pain or anything...

Heh, I noticed the 15000 at 15 and wrote it off to getting additional tonnage for other uses by using the definition of "standard ton" to the designer's advantage. I suffer from the same temptation, for Baltic and North Sea work I don't need a lot of range, but the way standard tons work if I increase the range I can get a bigger, badder ship for the same Treaty tonnage.

Kinda makes you wonder what would happen if we limited ships by maximum displacement instead of standard displacement, eh?

Germany might have suggested that, or light tonnage, but these things were decided by others.

And yeah, an impressive secondary battery, 9x6" per broadside. And that deck armor! She's really protected against plunging fire, and if the 6.25" is an average, then her armor over magazines and engineering spaces is really formidable.

They all look good.

Any reason for sticking with the 3" AA gun instead of 4" or 4.5"?

The CMBs look good, but 35knts from only 500hp?

The 4" will slowly be eclipsed by the 4.5" DP and 3" AA, I used the later for its true AA capability's.

As for the CMB its a typo, it should read 2x500hp engine for a total of 1000 hp.

Is the belt in the drawing the right length?
It seems you need to thin the belt or shorten the superstructure, or invent a tardis.

Cheers,

Which drawing, the BB or CA?

Memnon.

Cheers,