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301

Sunday, February 11th 2018, 1:39am

Nisshin Maru, Japan Research Vessel laid down 1944, converted in 1948

Displacement:
6,480 t light; 6,633 t standard; 7,661 t normal; 8,483 t full load

Dimensions: Length overall / water x beam x draught
392.23 ft / 380.00 ft x 70.00 ft x 16.80 ft (normal load)
119.55 m / 115.82 m x 21.34 m x 5.12 m

Machinery:
Diesel Internal combustion motors,
No drive to shaft, 2 shafts, 14,893 shp / 11,110 Kw = 20.00 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 1,850 tons

Complement:
409 - 532

Cost:
£1.884 million / $7.536 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 380 tons, 5.0 %
Hull, fittings & equipment: 2,100 tons, 27.4 %
Fuel, ammunition & stores: 1,181 tons, 15.4 %
Miscellaneous weights: 4,000 tons, 52.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
12,380 lbs / 5,616 Kg = 114.6 x 6 " / 152 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 3.3 ft / 1.0 m
Roll period: 16.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.62

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 5.43 : 1
'Natural speed' for length: 19.49 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 43
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.00 ft / 8.23 m
- Forecastle (20 %): 18.00 ft / 5.49 m
- Mid (50 %): 18.00 ft / 5.49 m
- Quarterdeck (15 %): 18.00 ft / 5.49 m
- Stern: 18.00 ft / 5.49 m
- Average freeboard: 18.72 ft / 5.71 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.5 %
- Above water (accommodation/working, high = better): 163.1 %
Waterplane Area: 19,455 Square feet or 1,807 Square metres
Displacement factor (Displacement / loading): 161 %
Structure weight / hull surface area: 78 lbs/sq ft or 380 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 2.04
- 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
Excellent seaboat, comfortable, rides out heavy weather easily

Miscellaneous weights breakdown (4000 tons)
Not sorted out yet.

302

Sunday, February 11th 2018, 1:42am

I-350

Date: 1948
Type: Coastal
Length: 40.0m
Beam: 4.5m
Draft: 4.5m
Crush depth: 225.0m
Light Displacement 335t
Loaded Displacement 363t
Full Displacement 405t
wt fuel&batts: 60t
Reserve buoyancy: 10%

Armament:
- 2 x 21" (bow)
ElecHP: 1650hp
DieselHP: 225hp
Speed:
- Max Surf Speed: 8.2 knots
- Max Sub Speed: 16.2 knots
Range:
- Surfaced: 3,781nm@8 knots
- Submerged: 122nm@5 knots
Tons Oil: 20.0t
Tons Battery: 40.0t
Miscellaneous Weight: 50 tons

Crew: 18

- 6 Type 3 torpedoes (= 2 in the tubes + 4 from the 8 tons for 'mines or reload torpedoes').
- Diesel-electric drive.
- Main electric engine output: 1,550 shp.
- Silent running engine output: 100 shp.
- Surface speed: (diesel-electric) 16.1 knots.
- Submerged speed: (silent running engines) 6.3 knots, (battery-electric) 15.8 knots, (diesel-electric + Ninjatousaya) 10 knots.
- Range Surfaced (diesel): 3,781nm@8 knots.
- Range Submerged (batteries, silent running engine): 862nm@2 knots, 375nm@3 knots, 122nm@5 knots.
- Range Submerged (batteries, main engine): 35nm@8 knots, 17nm@10 knots, 3nm@15 knots.
- Endurance: (surfaced, diesel) 19 days and 16 hours @ 8 knots, (submerged, electric) 1 day @ 5 knots.
- Diving depth: 295 feet
- Emergency Depth: 472 feet
- Crush Depth: 738 feet
- 50 tons Miscellaneous weights breakdown:
--- 10 tons for Ninjatousaya System.
--- 20 tons for sonar and hydrophones.
--- 10 tons for air condition system.
--- 1 tons for 20 oxygen bottles (50 l, 150 atm).
--- 5 tons CO2 removal system + Soda lime.
--- 4 tons for desalinization gear.

303

Tuesday, September 18th 2018, 10:20pm

The Anano is a test platform for the Funryu 4 (‘Raging Dragon’) Ship Launched Antiaircraft Rocket and is based on the Ashida class design. The superfiring main gun turrets were removed from the Ashida design and replaced by the Raiun ('Thundercloud') launch system. 75mm and 25mm guns, 61cm torpedoes and all ASWs were also removed while a few additional 40mm mounts were added. 1 inch protective plates cover part of the deck and the superstructure near and around the launchers.

Anano, Japan Experimental Light Cruiser laid down 1948

Displacement:
5,653 t light; 5,986 t standard; 6,951 t normal; 7,722 t full load

Dimensions: Length overall / water x beam x draught
559.17 ft / 540.00 ft x 49.50 ft x 19.00 ft (normal load)
170.43 m / 164.59 m x 15.09 m x 5.79 m

Armament:
4 - 5.00" / 127 mm guns (2x2 guns), 55.12lbs / 25.00kg shells, 1948 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 5.00" / 127 mm guns (2x2 guns), 0.00lbs / 0.00kg shells, 1948 Model
Automatic rapid fire guns in turrets (on barbettes)
on centreline ends, evenly spread, all raised mounts (see below)
48 - 1.57" / 40.0 mm guns (8x6 guns), 2.00lbs / 0.91kg shells, 1948 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 316 lbs / 144 kg
Shells per gun, main battery: 925 (see below)

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.00" / 51 mm 365.00 ft / 111.25 m 9.25 ft / 2.82 m
Ends: Unarmoured
Main Belt covers 104 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.00" / 76 mm 1.00" / 25 mm 2.00" / 51 mm
2nd: - - 2.00" / 51 mm
3rd: 1.00" / 25 mm 1.00" / 25 mm -

- Armour deck: 0.75" / 19 mm, Conning tower: 6.00" / 152 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 59,785 shp / 44,600 Kw = 32.00 kts
Range 6,000nm at 20.00 kts
Bunker at max displacement = 1,736 tons

Complement:
379 - 494

Cost:
£3.543 million / $14.171 million

Distribution of weights at normal displacement:
Armament: 87 tons, 1.2 %
Armour: 661 tons, 9.5 %
- Belts: 277 tons, 4.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 84 tons, 1.2 %
- Armour Deck: 252 tons, 3.6 %
- Conning Tower: 47 tons, 0.7 %
Machinery: 1,461 tons, 21.0 %
Hull, fittings & equipment: 2,245 tons, 32.3 %
Fuel, ammunition & stores: 1,297 tons, 18.7 %
Miscellaneous weights: 1,200 tons, 17.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,672 lbs / 3,480 Kg = 122.8 x 5.0 " / 127 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 1.9 ft / 0.6 m
Roll period: 15.0 seconds
Steadiness - As gun platform (Average = 50 %): 54 %
- Recoil effect (Restricted arc if above 1.00): 0.16
Seaboat quality (Average = 1.00): 1.09

Hull form characteristics:
Hull has low quarterdeck
and transom stern
Block coefficient: 0.479
Length to Beam Ratio: 10.91 : 1
'Natural speed' for length: 26.41 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.00 ft / 8.53 m
- Forecastle (20 %): 18.00 ft / 5.49 m
- Mid (50 %): 18.00 ft / 5.49 m
- Quarterdeck (20 %): 11.00 ft / 3.35 m (18.00 ft / 5.49 m before break)
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 17.40 ft / 5.30 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 99.0 %
- Above water (accommodation/working, high = better): 164.3 %
Waterplane Area: 18,166 Square feet or 1,688 Square metres
Displacement factor (Displacement / loading): 127 %
Structure weight / hull surface area: 74 lbs/sq ft or 360 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 1.25
- Overall: 0.91
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

2x2 5" mounts (2nd gun) simmed for AA Rocket launcher mount.

Actual rounds per gun:
5" guns: 500 rounds per gun
40mm guns: 2500 rounds per gun

200 tons for 2x4 Raiun AA Rocket launch systems ('B' and 'X') and Funryu 4 rockets
50 tons for Air Search Radar
20 tons for Surface Search Radar
100 tons for Fire Control
57 tons for damage control and fire suppression systems
15 tons for emergency diesel generators
57 tons for air condition system
112 tons for degauss coiling
21 tons for 5" loading, training and elevation systems
16 tons for 40mm loading, training and elevation systems
160 tons for testing and experimental facilities
208 tons for 1 inch protective plating on deck and superstructure
184 tons for various


Funryu 4 (data and image from "Japanese Secret Projects")


Length: 4 meters
Diameter: 0.6 meters
Wingspan: 1.6 meters
Weight: 1900 kg
Engine: One Toko Ro.2 rocket engine, 1500 kg thrust
Warhead: 200 kg
Maximum Speed: 1099 km/h
Maximum Range: 30 kilometers
Ceiling: 15000 meters
Guidance: Beam Riding

304

Wednesday, September 19th 2018, 1:41pm

Seems a reasonable design overall as a testbed.

I'm not sure whether its best to sim the launcher and missile magazine as a gun mount or just rely on misc weight.
I can see pros and cons with either method. At least this way it reserves space within the hull armour and some additional weight, although it will throw your recoil stats off a bit.

305

Wednesday, September 19th 2018, 5:42pm

Quoted

I'm not sure whether its best to sim the launcher and missile magazine as a gun mount or just rely on misc weight.

It was done more for the 2" barbette that would appear in the sim report than the gun mount itself, though it could easily be done with just the miscellaneous weights (and the 100 ton per launcher + rockets is probably more than enough). I just like it more this way. :) (also looking at the sim the way it is, it should be obvious that the launchers are superfiring the main guns, although it probably is not necessary as, according to wiki, the rocket would have been launched at a 45° angle).

Quoted

although it will throw your recoil stats off a bit

A quick test showed that it is only 0.03 difference between this design and one without the superfiring mounts. Also it is well below 1 so I am not too worried about that.

306

Thursday, September 20th 2018, 10:07am

In that case the rationale seems quite sound, and at least doing it that way will have given the correct topweight/ stability calc for the superfiring launchers.