WesWorld

Wes: forms follows function; the earlier, slower cruiser got a more typical Indian cruiser superstructure. The newer big destroyer got a ligther destroyer superstructure (which I just cut and pasted directly from one of my destroyer drawings).

You're right about the canvas hangar not being necessary, but the aircraft will likely have a longer service life if the whole thing is covered in bad weather.

Now we have to see what Chairman Cheung thinks of these designs we've sent him...

The vessel offered meets the power plant and range specifications. Additional length was worked in to allow more room for a hanger. While further increasing dimensions would allow more room, engine requirements would grow rapidly beyond the target range.

The Dutch experience with the placing of aircraft on our smaller destroyers in the 1920s was not overly satisfactory, the seakeeping of of this vessel should aid that issue.

A substantial amount of slack was left in the design, and a high miscellaneous wieght detailed, to allow for specification changes prior to a potential final design.

Escort Cruiser, China Kanoneerbooten laid down 1932

Displacement:
2,135 t light; 2,301 t standard; 2,515 t normal; 2,687 t full load

Dimensions: Length overall / water x beam x draught
408.87 ft / 393.70 ft x 42.65 ft x 11.15 ft (normal load)
124.62 m / 120.00 m x 13.00 m x 3.40 m

Armament:
6 - 5.51" / 140 mm guns (3x2 guns), 83.72lbs / 37.97kg shells, 1932 Model
Quick firing guns in deck mounts with hoists
on centreline, all aft, 1 raised mount aft - superfiring
2 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, all raised mounts
6 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread
16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.88kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
4 - 0.52" / 13.2 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 637 lbs / 289 kg
Shells per gun, main battery: 300
4 - 21.0" / 533 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0.98" / 25 mm 255.91 ft / 78.00 m 13.12 ft / 4.00 m
Ends: Unarmoured
Main Belt covers 100 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm 0.98" / 25 mm
2nd: 0.59" / 15 mm - -
3rd: 0.59" / 15 mm - -
4th: 0.59" / 15 mm - -

- Armour deck: 0.59" / 15 mm, Conning tower: 0.79" / 20 mm

Machinery:
Coal and oil fired boilers, steam turbines,
Geared drive, 3 shafts, 10,269 shp / 7,661 Kw = 23.15 kts
Range 5,000nm at 12.00 kts
Bunker at max displacement = 387 tons (85% coal)

Complement:
176 - 230

Cost:
£0.853 million / $3.410 million

Distribution of weights at normal displacement:
Armament: 80 tons, 3.2 %
Armour: 292 tons, 11.6 %
- Belts: 138 tons, 5.5 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 27 tons, 1.1 %
- Armour Deck: 124 tons, 4.9 %
- Conning Tower: 3 tons, 0.1 %
Machinery: 328 tons, 13.1 %
Hull, fittings & equipment: 1,235 tons, 49.1 %
Fuel, ammunition & stores: 380 tons, 15.1 %
Miscellaneous weights: 200 tons, 8.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,601 lbs / 2,087 Kg = 55.0 x 5.5 " / 140 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.8 ft / 0.5 m
Roll period: 13.5 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- Recoil effect (Restricted arc if above 1.00): 0.55
Seaboat quality (Average = 1.00): 1.60

Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.470
Length to Beam Ratio: 9.23 : 1
'Natural speed' for length: 22.87 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 22.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.29 ft / 6.49 m
- Forecastle (20 %): 21.29 ft / 6.49 m (13.29 ft / 4.05 m aft of break)
- Mid (50 %): 13.29 ft / 4.05 m
- Quarterdeck (15 %): 13.29 ft / 4.05 m
- Stern: 13.29 ft / 4.05 m
- Average freeboard: 14.89 ft / 4.54 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 78.7 %
- Above water (accommodation/working, high = better): 136.1 %
Waterplane Area: 11,320 Square feet or 1,052 Square metres
Displacement factor (Displacement / loading): 141 %
Structure weight / hull surface area: 71 lbs/sq ft or 347 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.83
- Overall: 1.04
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

India would charge a slip-usage fee of 10% on top of the cost of any vessels built in Indian yards. This would make each ship cosst 2408 + 241 = 2649 t.

A similar fee would apply to the second design, with a total cost of 2098 + 210 = 2308 t for each unit built in India. India is certainly happy to continue discussions on this type and modify it to suit Chinese requirements.

Alternately, China may purchase exclusive licences for 700 t for either design.

A top view will be a day or two away; I'm rather busy with farm chores at the moment.

A class two slipway is currently available from Q3/31 to Q4/33; five ships could be laid down at six month intervals during that period.

Peter the Great Yard, Vladivostok, thanks Chairman Cheung for his high praise, and would be pleased to construct this cruiser for China at a cost of her Light displacement, plus a fee of 10%, or a total of 2,412 tons of warship materials, payable upon delivery.

Construction can begin in the first quarter of 1932.

Quoted

A top view will be a day or two away; I'm rather busy with farm chores at the moment.

Or not. Guess I'm taking a couple hours off farm duty.



I had to modify the plan view after concluding that the torpedo carriages really wouldn't work on the centreline with this width. So now it's a quadruple bank firing to each side. That leaves some empty deck space around the catapult, but maybe light AA will fill it up later.

Placing the small boats in the space forward of the catapult would work well. That would allow you to place a few more larger ones where the current boats are placed.

603 tons per quarter would be satisfactory.