This is the
Pangu class of destroyer leaders that I built in a post 1925 game playing Skawbie's mods, the Coastal Defense Guns mod, and Director's Imperial China mod (Note that this is from the AAR that I am doing with Imperial China, this was from a different game). I read several posts about 6 in. gun destroyers and decided to try them out. Just a few comments, the torpedo armament is a bit light (4 per side) but since they were going to be so heavily gunned, I figured that torpedo were to be a secondary concern. They're also a bit slow, at 28 knots, but there have to be trade-offs for such a heavy gun armament. This class never saw active combat service, but a preceding experimental class of 5 destroyers worked out somewhat well (they didn't have all the fire control and good long-range reliable engines that these got), but with only five of them, they did not see much combat as a whole (two credible small actions was the sum of their battle service). I know there is no actual destroyer leader designation in game, but that is essentially what these were. Some other notes on the design, they had fully enclosed bridges (which made them popular for stormy Northern Pacific duty. I would have preferred fully enclosed gun turrets (the game doesn't allow them) just so the gun crews would have been better shielded from the weather. Designs posted below
For fun, I put the design into springsharp (still trying to learn the ins and outs of it) Here it is
Pangu, China Destroyer Leader laid down 1938
Displacement:
1,111 t light; 1,213 t standard; 1,500 t normal; 1,730 t full load
Dimensions: Length overall / water x beam x draught
352.73 ft / 341.00 ft x 34.00 ft x 18.00 ft (normal load)
107.51 m / 103.94 m x 10.36 m x 5.49 m
Armament:
8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1938 Model
Breech loading guns in deck mounts
on center-line ends, evenly spread, all raised mounts - super-firing
Main guns limited to end-on fire
Weight of broadside 864 lbs / 392 kg
Shells per gun, main battery: 150
8 - 18.0" / 457.2 mm above water torpedoes
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 17,450 shp / 13,018 Kw = 28.00 kts
Range 6,000nm at 16.00 kts
Bunker at max displacement = 517 tons
Complement:
119 - 156
Cost:
£1.060 million / $4.239 million
Distribution of weights at normal displacement:
Armament: 108 tons, 7.2 %
Machinery: 417 tons, 27.8 %
Hull, fittings & equipment: 586 tons, 39.0 %
Fuel, ammunition & stores: 389 tons, 25.9 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and sea-keeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
889 lbs / 403 Kg = 8.2 x 6.0 " / 152 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.34
Metacentric height 1.7 ft / 0.5 m
Roll period: 11.1 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 1.14
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.252
Length to Beam Ratio: 10.03 : 1
'Natural speed' for length: 18.47 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.31 ft / 6.19 m
- Forecastle (20 %): 12.93 ft / 3.94 m
- Mid (50 %): 12.93 ft / 3.94 m
- Quarterdeck (15 %): 12.93 ft / 3.94 m
- Stern: 12.93 ft / 3.94 m
- Average freeboard: 13.52 ft / 4.12 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 145.1 %
- Above water (accommodation/working, high = better): 163.2 %
Waterplane Area: 12,116 Square feet or 1,126 Square meters
Displacement factor (Displacement / loading): 82 %
Structure weight / hull surface area: 36 lbs/sq ft or 176 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.45
- Longitudinal: 3.13
- Overall: 0.54
Hull space for machinery, storage, compartmentation is cramped
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