WesWorld

The CNDO, Chinese Navy Design Office, is an organization of the Chinese Navy. Its purpose is to preserve
the knowledge of the chinese shipbuilding industry and to develop further. The company is funded by the
Chinese Navy and is a joint venture of two chinese shipyards, the Kiangnan Dock & Engineering Works in
Shanghai and Quindao Beihai Shipbuilding in Taipei. The design work is carried out in the facilities of
both companies.
The CNDO receives development contracts from all branches of the armed forces, and also from foreign
nations.

Project A: successor of the Shuihong-Class; project was published; first vessels ordered


Project B: fishermen protecting vessel and subchaser; project was published; first vessels will be built in 1941


Project C: advanced heavy cruiser (Zunyi or Prince Class); first drawings started; target date not known


Project D: successor of the Fuzhou-Class; preliminary investigations started

- aircraft recovery


- sea rescue service


- operational tasks


- training


- air defense


not more information published at present

None at present

The chinese navy intended to built a seaplane tender. The leadership of the chinese navy wanted a cheap and easy-to-build seaplane tender. The plan was then, however, rejected in favor of the Zhuhai-class.


Xu-Class
Seaplane Tender

Displacement:
6.963 t light; 7.143 t standard; 7.506 t normal; 7.796 t full load

Dimensions: Length overall / water x beam x draught
481,91 ft / 474,08 ft x 64,96 ft x 17,06 ft (normal load)
146,88 m / 144,50 m x 19,80 m x 5,20 m

Armament:
12 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread
8 - 1,46" / 37,0 mm guns in single mounts, 1,55lbs / 0,70kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships
12 - 0,30" / 7,6 mm guns (6x2 guns), 0,01lbs / 0,00kg shells, 1933 Model
Machine guns in deck mounts
on centreline ends, evenly spread
Weight of broadside 262 lbs / 119 kg
Shells per gun, main battery: 200

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1,38" / 35 mm 225,07 ft / 68,60 m 11,35 ft / 3,46 m
Ends: Unarmoured
Main Belt covers 73% of normal length

- Armour deck: 0,98" / 25 mm, Conning tower: 1,38" / 35 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 34.084 shp / 25.427 Kw = 25,80 kts
Range 8.000nm at 10,00 kts
Bunker at max displacement = 653 tons

Complement:
403 - 524

Cost:
£1,939 million / $7,757 million

Distribution of weights at normal displacement:
Armament: 33 tons, 0,4%
Armour: 547 tons, 7,3%
- Belts: 162 tons, 2,2%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 0 tons, 0,0%
- Armour Deck: 374 tons, 5,0%
- Conning Tower: 11 tons, 0,2%
Machinery: 993 tons, 13,2%
Hull, fittings & equipment: 3.640 tons, 48,5%
Fuel, ammunition & stores: 543 tons, 7,2%
Miscellaneous weights: 1.750 tons, 23,3%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
16.845 lbs / 7.641 Kg = 810,1 x 3,5 " / 88 mm shells or 2,3 torpedoes
Stability (Unstable if below 1.00): 1,00
Metacentric height 2,6 ft / 0,8 m
Roll period: 16,9 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0,07
Seaboat quality (Average = 1.00): 2,00

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0,500
Length to Beam Ratio: 7,30 : 1
'Natural speed' for length: 21,77 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 29,20 ft / 8,90 m
- Forecastle (18%): 29,20 ft / 8,90 m
- Mid (50%): 29,20 ft / 8,90 m
- Quarterdeck (18%): 14,11 ft / 4,30 m (29,20 ft / 8,90 m before break)
- Stern: 14,11 ft / 4,30 m
- Average freeboard: 26,56 ft / 8,10 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 72,6%
- Above water (accommodation/working, high = better): 283,2%
Waterplane Area: 20.519 Square feet or 1.906 Square metres
Displacement factor (Displacement / loading): 165%
Structure weight / hull surface area: 101 lbs/sq ft or 494 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,04
- Longitudinal: 4,52
- Overall: 1,21
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, can fire her guns in the heaviest weather

Already in the Great War, the available small barges for naval aviators, were not been strong enough in many cases for recovering a
damaged floatplane. With the increasing size and weight of new aircraft designs, therefore it is an increasing demand of ships, which
are equipped with a powerful crane, so that seaplanes could directly be taken on board and brought back to the base.

The CNDO followed two routes:

A) The construction of a ship with high seaworthiness and sufficient range for use on open sea: aircraft salvage ship

B) The construction of units with a shallow draft and a special propeller protection for use in shallow waters: salvage lighter


Aircraft salvage ship:
Air salvage ships are planned to support float planes in areas where no costal bases were available. Equipped with a huge crane,
those ships could take the float planes on board, refuel and re-arm them or do some maintenance duty.

The CNDO presented the Línchóng-Type as a first version.

Salvage Lighters:
Salvage lighters will be used for the salvage of downed seaplanes in coastal areas. Equipped with a huge crane and pump and repair
facilities, those ships could take the float plane on board and repair them or bring them back to the seaplanebase.

The CNDO presented the Heizhì-Type.

The chinese navy intended to convert the old Thrasius-Class Cruisers to an assault ship, which could be used as amphibious support vessel. Therefore China bought in 1940 4 vessels of this class from Mexico. During the investigation about the realisation of this rebuilding, it was decided to build new vessels instead of converting these old ships. Finally the vessels were not taken in service and were scrapped 1941 at Dairen.

as light cruiser

Thrasius class, Mexico (ex-Atlantis) Light Cruiser laid down 1912 (Engine 1917)

Displacement:
4,570 t light; 4,758 t standard; 4,986 t normal; 5,169 t full load

Dimensions: Length overall / water x beam x draught
459.70 ft / 456.00 ft x 52.00 ft x 16.00 ft (normal load)
140.12 m / 138.99 m x 15.85 m x 4.88 m

Armament:
2 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
6 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
Breech loading guns in deck mounts
on side, all amidships
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1912 Model
Quick firing guns in deck mounts
on side, evenly spread
10 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1912 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 923 lbs / 419 kg
Shells per gun, main battery: 150
4 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 310.00 ft / 94.49 m 12.00 ft / 3.66 m
Ends: 1.57" / 40 mm 146.00 ft / 44.50 m 8.00 ft / 2.44 m
Upper: 1.18" / 30 mm 160.00 ft / 48.77 m 8.00 ft / 2.44 m
Main Belt covers 105 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -

- Armour deck: 1.18" / 30 mm, Conning tower: 6.10" / 155 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 4 shafts, 35,598 shp / 26,556 Kw = 28.00 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 412 tons

Complement:
296 - 385

Cost:
£0.440 million / $1.758 million

Distribution of weights at normal displacement:
Armament: 115 tons, 2.3 %
Armour: 1,011 tons, 20.3 %
- Belts: 628 tons, 12.6 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 11 tons, 0.2 %
- Armour Deck: 333 tons, 6.7 %
- Conning Tower: 38 tons, 0.8 %
Machinery: 1,305 tons, 26.2 %
Hull, fittings & equipment: 2,089 tons, 41.9 %
Fuel, ammunition & stores: 416 tons, 8.3 %
Miscellaneous weights: 50 tons, 1.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,516 lbs / 2,956 Kg = 60.3 x 6.0 " / 152 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 2.8 ft / 0.9 m
Roll period: 13.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.20
Seaboat quality (Average = 1.00): 1.24

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.460
Length to Beam Ratio: 8.77 : 1
'Natural speed' for length: 21.35 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 57
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (70 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 17.08 ft / 5.21 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 104.3 %
- Above water (accommodation/working, high = better): 153.5 %
Waterplane Area: 15,251 Square feet or 1,417 Square metres
Displacement factor (Displacement / loading): 109 %
Structure weight / hull surface area: 86 lbs/sq ft or 422 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.06
- Longitudinal: 1.80
- Overall: 1.12
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
Good seaboat, rides out heavy weather easily

as planned assault ship

Displacement:
4.400 t light; 4.535 t standard; 4.990 t normal; 5.353 t full load

Dimensions: Length overall / water x beam x draught
459,71 ft / 456,00 ft x 52,00 ft x 16,01 ft (normal load)
140,12 m / 138,99 m x 15,85 m x 4,88 m

Armament:
1 - 5,98" / 152 mm guns in single mounts, 107,15lbs / 48,60kg shells, 1912 Model
Breech loading gun in deck mount
on centreline forward
8 - 1,85" / 47,0 mm guns (2x4 guns), 3,17lbs / 1,44kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all aft, all raised mounts - superfiring
2 - 1,85" / 47,0 mm guns (1x2 guns), 3,17lbs / 1,44kg shells, 1940 Model
Anti-aircraft guns in deck mount
on side forward, all raised guns
8 - 0,79" / 20,0 mm guns (2x4 guns), 0,24lbs / 0,11kg shells, 1940 Model
Machine guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 141 lbs / 64 kg
Shells per gun, main battery: 400

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3,15" / 80 mm 310,01 ft / 94,49 m 12,01 ft / 3,66 m
Ends: Unarmoured
Main Belt covers 105% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,79" / 20 mm 0,39" / 10 mm -
2nd: 0,39" / 10 mm 0,39" / 10 mm -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 20.986 shp / 15.655 Kw = 24,50 kts
Range 5.000nm at 16,00 kts
Bunker at max displacement = 818 tons

Complement:
296 - 385

Cost:
£0,247 million / $0,989 million

Distribution of weights at normal displacement:
Armament: 18 tons, 0,4%
Armour: 493 tons, 9,9%
- Belts: 489 tons, 9,8%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 5 tons, 0,1%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 561 tons, 11,2%
Hull, fittings & equipment: 2.078 tons, 41,6%
Fuel, ammunition & stores: 590 tons, 11,8%
Miscellaneous weights: 1.250 tons, 25,1%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
9.525 lbs / 4.320 Kg = 88,9 x 6,0 " / 152 mm shells or 1,9 torpedoes
Stability (Unstable if below 1.00): 1,03
Metacentric height 2,0 ft / 0,6 m
Roll period: 15,4 seconds
Steadiness - As gun platform (Average = 50 %): 83 %
- Recoil effect (Restricted arc if above 1.00): 0,04
Seaboat quality (Average = 1.00): 1,65

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,460
Length to Beam Ratio: 8,77 : 1
'Natural speed' for length: 21,35 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 10,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21,00 ft / 6,40 m
- Forecastle (20%): 20,01 ft / 6,10 m
- Mid (70%): 20,01 ft / 6,10 m (10,01 ft / 3,05 m aft of break)
- Quarterdeck (15%): 10,01 ft / 3,05 m
- Stern: 10,01 ft / 3,05 m
- Average freeboard: 17,09 ft / 5,21 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 67,8%
- Above water (accommodation/working, high = better): 173,8%
Waterplane Area: 15.252 Square feet or 1.417 Square metres
Displacement factor (Displacement / loading): 166%
Structure weight / hull surface area: 86 lbs/sq ft or 420 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,16
- Longitudinal: 1,86
- Overall: 1,22
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, can fire her guns in the heaviest weather

1250tons = aircraft and vehicles:
--------------------------------------------
250tons = 10 planes
150tons = doors, landing craft launch system, cranes
700tons = 350 soldiers
50tons = 5 landing crafts
100tons = cargo