WesWorld

With the tender thread, I've decided to post some stats on Russian merchant ships presently being produced for civilian service. And yes, you've seen 'em before. The larger is a shorter-range version of the Dalniy class Torpedo Cruiser Tender, and the smaller is of course the Sadko class. Anti-aircraft armament shown is optional. Their turbine propulsion assures better fuel economy than reciprocating engines on competitors.* They both have range, excellent seakeeping, and good cargo capacity for their size:

Dalniy class, Russian Merchant Ship laid down 1928

Displacement:
5,785 t light; 5,925 t standard; 6,538 t normal; 7,029 t full load

Dimensions: Length overall / water x beam x draught
415.86 ft / 393.70 ft x 59.06 ft x 16.40 ft (normal load)
126.75 m / 120.00 m x 18.00 m x 5.00 m

Armament:
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1928 Model
Anti-aircraft guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 6 lbs / 3 kg
Shells per gun, main battery: 2,500

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 6,949 shp / 5,184 Kw = 17.00 kts
Range 15,000nm at 10.00 kts
Bunker at max displacement = 1,104 tons

Complement:
36 - 47

Cost:
£0.891 million / $3.565 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.0 %
Machinery: 216 tons, 3.3 %
Hull, fittings & equipment: 1,567 tons, 24.0 %
Fuel, ammunition & stores: 754 tons, 11.5 %
Miscellaneous weights: 4,000 tons, 61.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
757 lbs / 344 Kg = 490 x 1.5 " / 37 mm shells or 1.7 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 2.4 ft / 0.7 m
Roll period: 16.0 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.57

Hull form characteristics:
Hull has raised forecastle, rise forward of midbreak, raised quarterdeck
Block coefficient: 0.600
Length to Beam Ratio: 6.67 : 1
'Natural speed' for length: 19.84 kts
Power going to wave formation at top speed: 41 %
Trim (Max stability = 0, Max steadiness = 100): 32
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 9.84 ft / 3.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.33 ft / 6.50 m
- Forecastle (20 %): 16.40 ft / 5.00 m (10.17 ft / 3.10 m aft of break)
- Mid (50 %): 11.48 ft / 3.50 m (10.17 ft / 3.10 m aft of break)
- Quarterdeck (15 %): 16.40 ft / 5.00 m (10.17 ft / 3.10 m before break)
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 12.94 ft / 3.95 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 78.0 %
- Above water (accommodation/working, high = better): 93.5 %
Waterplane Area: 17,005 Square feet or 1,580 Square metres
Displacement factor (Displacement / loading): 147 %
Structure weight / hull surface area: 67 lbs/sq ft or 329 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.13
- Overall: 1.01
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather



Sadko class, Russian Merchant Ship laid down 1929

Displacement:
2,561 t light; 2,626 t standard; 2,942 t normal; 3,195 t full load

Dimensions: Length overall / water x beam x draught
308.94 ft / 295.28 ft x 49.21 ft x 11.81 ft (normal load)
94.16 m / 90.00 m x 15.00 m x 3.60 m

Armament:
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1929 Model
Anti-aircraft guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1929 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 6 lbs / 3 kg
Shells per gun, main battery: 1,700

Machinery:
Coal and oil fired boilers, steam turbines,
Geared drive, 2 shafts, 5,903 shp / 4,404 Kw = 18.00 kts
Range 12,000nm at 10.00 kts
Bunker at max displacement = 569 tons (15% coal)

Complement:
20 - 26

Cost:
£0.464 million / $1.856 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.0 %
Machinery: 184 tons, 6.2 %
Hull, fittings & equipment: 826 tons, 28.1 %
Fuel, ammunition & stores: 382 tons, 13.0 %
Miscellaneous weights: 1,550 tons, 52.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
425 lbs / 193 Kg = 275 x 1.5 " / 37 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 2.1 ft / 0.6 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.50

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.600
Length to Beam Ratio: 6.00 : 1
'Natural speed' for length: 17.18 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 34
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 9.84 ft / 3.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.65 ft / 6.60 m
- Forecastle (20 %): 18.04 ft / 5.50 m (11.15 ft / 3.40 m aft of break)
- Mid (50 %): 11.15 ft / 3.40 m
- Quarterdeck (15 %): 16.40 ft / 5.00 m (11.15 ft / 3.40 m before break)
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 13.61 ft / 4.15 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 78.5 %
- Above water (accommodation/working, high = better): 113.5 %
Waterplane Area: 10,628 Square feet or 987 Square metres
Displacement factor (Displacement / loading): 153 %
Structure weight / hull surface area: 56 lbs/sq ft or 271 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.77
- Overall: 1.03
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather



* For turbine-driven Sadko class, 12,000 nm @ 10 kts:

Distribution of weights at normal displacement:
Armament: 1 tons, 0.0 %
Machinery: 184 tons, 6.2 %
Hull, fittings & equipment: 826 tons, 28.1 %
Fuel, ammunition & stores: 382 tons, 13.0 %
Miscellaneous weights: 1,550 tons, 52.7 %


For reciprocating engine-driven Sadko class, 12,000 nm @ 10 kts:

Distribution of weights at normal displacement:
Armament: 1 tons, 0.0 %
Machinery: 341 tons, 11.6 %
Hull, fittings & equipment: 829 tons, 28.2 %
Fuel, ammunition & stores: 471 tons, 16.0 %
Miscellaneous weights: 1,300 tons, 44.2 %

Lighter engine, 20% greater cargo capacity, and 20% better fuel economy. What's not to like?

Quoted

Lighter engine, 20% greater cargo capacity, and 20% better fuel economy. What's not to like?

That its complete crap. (but thats not your fault)

I need to find some more numbers, but reciprocating engines are more fuel efficient at slower speeds. Only at 20knts+ are turbines more efficient. Why did interwar merchant vessels still use reciprocating engines? Speed isn't an issue with non-perishable goods.

Quoted

That its complete crap. (but thats not your fault)

I don't doubt that for a minute. You know far more about such matters than I do.

Quoted

I need to find some more numbers, but reciprocating engines are more fuel efficient at slower speeds. Only at 20knts+ are turbines more efficient. Why did interwar merchant vessels still use reciprocating engines? Speed isn't an issue with non-perishable goods.

Sure. But Spring* defines the physics of the WesWorld, and SpringSharp sez turbines have better fuel economy at 10 knots than reciprocating engines do.