WesWorld

Thanks to Brock for the sim.

R-98-class Submarine

Date 1940
Coastal
Armament 1x75mm gun
ElecHP 3,000
DieselHP 4,500
CREW 49
wt fuel&batts 200t
Light Displacement 735t
Loaded Displacement 835t
Full Displacement 987t
res buoyancy 15%
Max Surf Spd 19 knots
Max Sub Spd 11.4 knots

Length: 67.0m
Beam: 6.2m
Draft: 4.8m
Crush depth: 212.5m
#TT 6 x 21"
Tons Oil: 100.0t
Tons Battery: 100.0t
Tons Misc: 41

Surface Range 7,640@10 knots
Underwater range 31@6 knots

So how far can it go at it's full underwater speed? Any other gun armament besides the single 75mm?

The remaining armament consists of 4x20mm and 4x50cal MG's. Submerged speed (unless I read it wrong) is "Max Sub Spd 11.4 knots".

Range at full speed on batteries is, er, three miles. Maybe I'll see about increasing that.

So the weight of those guns would be taken out of the misc. tonnage, as would any reload torpedoes or torpedo-tube launched mines. I read the max speed, what I was wondering was what is the range at 11.4 knots. It has a range at 6 knots of 31 miles, what's the range at 11.4 knots?

Quoted

Originally posted by Brockpaine
Range at full speed on batteries is, er, three miles. Maybe I'll see about increasing that.

Either increase it or reduce the electric engine power and use the weight savings for more batteries. I didn't think it would be long-ranged, batteries get drained FAST.

Quoted

R-98-class Submarine

Date 1940
Coastal
Armament 1x75mm gun
ElecHP 2,000
DieselHP 4,500
CREW 49
wt fuel&batts 250t
Light Displacement 735t
Loaded Displacement 835t
Full Displacement 987t
res buoyancy 15%
Max Surf Spd 19 knots
Max Sub Spd 10 knots

Length: 67.0m
Beam: 6.2m
Draft: 4.8m
Crush depth: 212.5m
#TT 6 x 21"
Tons Oil: 100.0t
Tons Battery: 150.0t
Tons Misc: 44

Surface Range 7,640@10 knots
Underwater range 53@6 knots or 10nm@10 knots

Lowered submerged speed, increased batteries by 50%. Also 4 tons more miscellaneous weight. (Presume the MGs are counted in that.)

That's better. 1 hour at full electric power isn't too bad, and range would be pretty decent at 4 knots submerged.

What I've tended to do with Subsim designs is use the mine tonnage line for mines or reload torpedoes and the misc. tonnage line for extra guns, it makes the breakdown a little clearer. Something to consider, anyway.

Quoted

The remaining armament consists of 4x20mm and 4x50cal MG's.

That's quite some armament for a small submarine. I really doubt it'll be going at 11kts underwater with all that on the deck in addition to the 75mm gun. 11kts is pretty easy to achieve with some basic streamlining, but it essentially entails removing all gun armament in consequence.

50 cals detatch, 20mm's are aft of conning tower. The R-98's are acctually longer than my D-22 class fleet subs (which have a larger beam) so size shouldn't be an issue.

Modified Zerberus, Atlantean Anti-aircraft cruiser laid down 1940



Displacement:
5,906 t light; 6,211 t standard; 6,928 t normal; 7,501 t full load

Dimensions: Length overall / water x beam x draught
542.17 ft / 528.00 ft x 51.50 ft x 18.50 ft (normal load)
165.25 m / 160.93 m x 15.70 m x 5.64 m

Armament:
12 - 5.10" / 130 mm guns (6x2 guns), 66.33lbs / 30.08kg shells, 1940 Model
Dual purpose guns in deck mounts with hoists
on centreline, evenly spread, 2 raised mounts
8 - 1.58" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.89kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 1.58" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.89kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, 1 raised mount
36 - 0.79" / 20.0 mm guns (7x2, 12x1 guns), 0.24lbs / 0.11kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 10 raised mounts
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1940 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 829 lbs / 376 kg
Shells per gun, main battery: 350
10 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.35" / 60 mm 345.00 ft / 105.16 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 101 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.58" / 40 mm 0.79" / 20 mm 1.58" / 40 mm
2nd: 1.00" / 25 mm - -

- Armour deck: 1.58" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 63,279 shp / 47,206 Kw = 32.39 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 1,291 tons

Complement:
379 - 493

Cost:
£3.184 million / $12.734 million

Distribution of weights at normal displacement:
Armament: 104 tons, 1.5 %
Armour: 944 tons, 13.6 %
- Belts: 331 tons, 4.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 49 tons, 0.7 %
- Armour Deck: 540 tons, 7.8 %
- Conning Tower: 25 tons, 0.4 %
Machinery: 1,692 tons, 24.4 %
Hull, fittings & equipment: 3,086 tons, 44.5 %
Fuel, ammunition & stores: 1,022 tons, 14.8 %
Miscellaneous weights: 80 tons, 1.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
9,583 lbs / 4,347 Kg = 144.5 x 5.1 " / 130 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 2.3 ft / 0.7 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.42
Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.482
Length to Beam Ratio: 10.25 : 1
'Natural speed' for length: 26.23 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.20 ft / 7.68 m
- Forecastle (20 %): 19.00 ft / 5.79 m
- Mid (50 %): 19.00 ft / 5.79 m
- Quarterdeck (15 %): 19.00 ft / 5.79 m
- Stern: 19.00 ft / 5.79 m
- Average freeboard: 19.50 ft / 5.94 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 94.0 %
- Above water (accommodation/working, high = better): 132.1 %
Waterplane Area: 18,531 Square feet or 1,722 Square metres
Displacement factor (Displacement / loading): 132 %
Structure weight / hull surface area: 97 lbs/sq ft or 471 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.07
- Longitudinal: 2.14
- Overall: 1.15
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

20 tons for improved gun dirrectors
20 tons for torpedo's
10 tons for torpedo handling equipment
30 tons for Radars

Modifications mainly involve reducing topweight by lowering the main gun mounts and superstructure in an effort to increase the number of AA without any negative effect.