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Tuesday, July 8th 2003, 10:40pm

Houkokusho Taisho 8 Nen 6 Getsu 30 Nichi

(hope I made no mistakes)

Second Quarter of Eighth year of the Emperor Taisho report of Japan.

Submitted by Nakamura Shoda to the Shogun. Taisho 8 Nen 6 Getsu 30 Nichi


Attached is a list of the 2nd quarter of the Eight year of the Reign of Emperor Taisho.

Your loyal servant and secretary,
Nakamura Shoda


Factory assignment:

Of the 25 factories available to the empire, Factories I to XV are used for the infrastructure (fixed for the year) for a total of 1.5 points in the quarter. Factories XVI to XXV are assigned to produce materials to be used in the warships for a total of 10000 tons in the quarter.


As per Kobe Protocol, 1,000 t of warship material have been delivered to Japan as compensation for the loss of the Augsburg. In total, Germany still owes 3,000 t of material to Japan.

Infrastructure construction:

The infrastructure points are used in the construction on Factory XXVI (3 points at end of 2nd quarter).


I) Ships already under construction.

Five vessels were under construction on April 1, 1921. The Experimental carrier Hosho, the carriers Zuiho (ex Kaga) and Shoho (ex Tosa), the Battleship Mutsu and the Coast Defense Ship Atsusa.

April 1, 1921 status. (x months under construction, y tons used total)
Hosho: See below. 16 months, 7005 tons. 405 tons used this month.
Zuiho: 13.5 months, 10890 tons. 2280 tons used this month.
Shoho: 8.5 months 6850 tons. 2340 tons used this month.
Mutsu: 47 months, 37600 tons. 3000 tons used this month. Note: a few minor problems caused some minor delays. It is still believed that Mutsu will be ready in the first half of next month.
Atsusa: 3 months, 1000 tons. 975 tons used this month.

II) Ships started in the second quarter.

The Coastal Defense ships Zansho (“Lingering [summer] Heat”) and Asasamu (“Morning Chill” or “Morning Cold”) of the Atsusa class were laid down on 4/2/1921 and 4/5/1921 respectively. Each one requires 3,630 tons of materials and 12.75 months construction time before they are completed. It is expected that both ships will be launched early September and will be ready Late April 1922.

III) Status of ships under construction at the end of the second quarter.
Of the 11000 tons, the Mutsu will receive 3x1000 = 3000 tons, the Zuiho will receive 3x760 = 2280 tons, the Shoho will receive 3x780 = 2340 tons, the Hosho will receive 405 tons, Atsusa will receive 3x325 = 975 tons, Zansho will receive 2x292 and 1x 291 = 875 tons and Asasamu will receive 2x292 and 1x 291 = 875 tons.

IIIB) additional note.
250 tons used for the modification of 215 WWI Air Force planes to be used aboard the carriers.

Mutsu at 99.99%. Still requires 0 tons and 0 months.
Zuiho at 40%. Still requires 19,420 tons and 26.75 months
Tosa at 30%. Still requires 21,450 tons and 28.25 months.
Atsusa at 54%. Still requires 1655 tons and 6.75 months.
Zansho at 24%. Still requires 2755 tons and 9.75 months.
Asasamu at 24%. Still requires 2755 tons and 9.75 months.

IVa) Finished ships
The Carrier HIJMS Hosho was completed on April 12. She set sail on April 24 for Yokosuka to be fitted out with aircraft. Hosho is capable of carrying 42 planes, but only 30 modified WWI planes will be used for the shakedown cruise, which will start in May.

IVb) Launched ships
Atsusa launched from Slip II-5A at Fukuoka Navy Yard, Fukuoka (Kyushu) on June 10.

Current fleet:
At the end of the 2nd Quarter
- Battleships (5+1): 4 Fuso class and 1 Nagato class active. 1 Nagato class under construction.
- Carriers (1+2): 1 Hosho class active. 2 Zuiho class under construction.
- Heavy/Armored Cruisers (8+0): 4 Asama and 4 Jakumo class active. None under construction.
- Light Cruisers (13+0): 2 Tenryu class, 5 Kuma class, and 6 Nagara class active. None under construction.
- 1st Class Destroyers (0+0): None active. None under construction.
- 2nd Class Destroyers (22+0): 13 Minekaze class and 9 Kamikaze class active. None under construction.
- CDS (0+3): 3 Atsusa class under construction.
- Submarines (5+0): 2 Ie Ichi class and 5 Ie Ni class active.
Nagato returned from its shakedown cruiser June 17th. It should be noted that gunnery skills have greatly improved since the North Yemen Campaign.
Hosho started its shakedown cruise on May 5th.

Construction/Repair activity:

I) Slips/Docks:
- Zuiho under construction on Slip V-3A at Kawasaki Co, Kobe (Honshu).
- Shoho under construction on Slip V-4A at Mitsubushi Co, Nagasaki (Kyushu).
- Atsusa under construction and launched from Slip II-5A at Fukuoka Navy Yard, Fukuoka (Kyushu).
- Zansho under construction on Slip II-3A at Kawasaki Co, Kobe (Honshu).
- Asasamu under construction on Slip II-4A at Mitsubushi Co, Nagasaki (Kyushu).
All other slips and docks are currently not used.

II) Free-floating construction
- Mutsu under construction at Yokosuka Navy Yard, Yokosuka (Honshu).
- Hosho completed at Hakodate Navy Yard, Hakodate (Hokkaido).


With planning I made a slight calculation error. Those 250 tons were originally for the Hosho, but after calculations, I found out I only needed 405 tons instead of the originally calculated 655 tons. I decided to use the 250 tons for modifications on existing planes for use on carriers rather than to recalculate the whole plan. :-P
(Of course I could also have used it for the very small wooden vesseld)



Wednesday, July 9th 2003, 9:33pm

Data on the Atsusa class Coast Defense Ship, released by the Imperial Navy:

Atsusa, Japan CDS laid down 1921

Number of ships to be built: 6.

Ships and names:
Atsusa means “Heat”
Zansho means “Lingering [summer] Heat”
Asasamu means “Morning Chill” or “Morning Cold”
Yosamu means “Night Chill” or “Cold Night”
Kanya means “Cold Night” or “Midwinter Night”
Sokobie means “Deep Cold”

3,630 t light; 3,840 t standard; 4,149 t normal; 4,379 t full load
Loading submergence 421 tons/feet

400.00 ft x 55.00 ft x 12.00 ft (normal load)
121.92 m x 16.76 m x 3.66 m

4 - 9.06" / 230 mm guns (2 Main turrets x 2 guns)
8 - 1.97" / 50 mm AA guns
20 - 0.98" / 25 mm guns
Weight of broadside 1,525 lbs / 692 kg

Belt 5.00" / 127 mm, ends unarmoured
Belts cover 65 % of normal area
Main turrets 8.00" / 203 mm, AA gun shields 1.00" / 25 mm, Light gun shields 1.00" / 25 mm
Armour deck 2.00" / 51 mm, Conning tower 5.00" / 127 mm

Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 9,620 shp / 7,176 Kw = 20.00 kts
Range 5,800nm at 12.00 kts

258 - 335

£0.849 million / $3.396 million

Distribution of weights at normal displacement:
Armament: 191 tons, 4.6 %
Armour: 1,274 tons, 30.7 %
Belts: 319 tons, 7.7 %, Armament: 381 tons, 9.2 %, Armour Deck: 545 tons, 13.1 %
Conning Tower: 28 tons, 0.7 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 331 tons, 8.0 %
Hull, fittings & equipment: 1,834 tons, 44.2 %
Fuel, ammunition & stores: 519 tons, 12.5 %
Miscellaneous weights: 0 tons, 0.0 %

Metacentric height 3.3

Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.30
Shellfire needed to sink: 7,757 lbs / 3,518 Kg = 20.9 x 9.1 " / 230 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.1
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 53 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.29
Relative quality as seaboat: 1.06

Hull form characteristics:
Block coefficient: 0.550
Sharpness coefficient: 0.39
Hull speed coefficient 'M': 7.61
'Natural speed' for length: 20.00 kts
Power going to wave formation at top speed: 45 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 62.2 %
Relative accommodation and working space: 112.1 %
(Average = 100%)
Displacement factor: 120 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.00
(Structure weight / hull surface area: 95 lbs / square foot or 464 Kg / square metre)
Relative longitudinal hull strength: 1.00
(for 10.30 ft / 3.14 m average freeboard, freeboard adjustment -2.40 ft)
Relative composite hull strength: 1.00