WesWorld

May be built instead of the Étangs de Sologne-class above. Based on the USN's 70-ton light harbour tug.

[SIZE=3]Alouette-class Small Harbour Tug[/SIZE]
Displacement: 75 tonnes
Length: 21 m
Width: 5.2 m
Draught: 2.40 m
Machinery: 2x naval diesels
Speed: 10 knots
Crew: 8 men
Armament: two 13.2mm machine guns and two light 6.5mm machine guns

I was wondering how other players might react to the design and decided to hold my thoughts for a while; but since you have posited a design without the helicopter deck, I guess I should have my say.

I think that the provision of a helicopter deck - and presumably troop-carrying helicopters - wasreally pushing this design into the 1950s; my proposing an alternate design the result is not unlike the WW2 vintage Casa Grande class and much more in keeping with the main stream of tactical thinking rather than being so far in advance. The alternate design is a clear follow-on from the existing Caiman type landing ship and is comparable to the British Glens.

[SIZE=3]VTB1 motor torpedo boat[/SIZE]
Displacement: 30 tonnes
Length: 20 m
Width: 3.96 m
Draught: 1.25 m
Machinery: 2x Lorraine petrol engines or Clerget diesels driving two shafts, 2200 hp total
Speed: 45 knots
Range: 330nm at 45 knots
Crew: 5 men
Armament:
- 2 x 13.2mm machine guns
- 2 x 400mm torpedoes
- 1 x DC roll-off rack

One boat may be constructed as a test/trials unit.

[SIZE=3]Camerone-class, French Military Transport laid down 1938[/SIZE]

Displacement:
4,220 t light; 4,387 t standard; 7,319 t normal; 9,665 t full load

Dimensions: Length overall / water x beam x draught
437.41 ft / 426.51 ft x 59.06 ft x 16.40 ft (normal load)
133.32 m / 130.00 m x 18.00 m x 5.00 m

Armament:
8 - 1.57" / 40.0 mm guns (2x4 guns), 1.95lbs / 0.88kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1938 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 2,000

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 1 shaft, 5,885 shp / 4,390 Kw = 16.00 kts
Range 25,000nm at 16.00 kts
Bunker at max displacement = 5,279 tons

Complement:
395 - 514

Cost:
£0.970 million / $3.878 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.0 %
Machinery: 161 tons, 2.2 %
Hull, fittings & equipment: 2,007 tons, 27.4 %
Fuel, ammunition & stores: 3,099 tons, 42.3 %
Miscellaneous weights: 2,050 tons, 28.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
24,406 lbs / 11,070 Kg = 12,498.0 x 1.6 " / 40 mm shells or 4.4 torpedoes
Stability (Unstable if below 1.00): 1.29
Metacentric height 3.6 ft / 1.1 m
Roll period: 13.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.620
Length to Beam Ratio: 7.22 : 1
'Natural speed' for length: 20.65 kts
Power going to wave formation at top speed: 35 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (20 %): 22.97 ft / 7.00 m
- Mid (50 %): 21.33 ft / 6.50 m (14.76 ft / 4.50 m aft of break)
- Quarterdeck (15 %): 15.42 ft / 4.70 m
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 19.04 ft / 5.80 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 39.4 %
- Above water (accommodation/working, high = better): 163.0 %
Waterplane Area: 18,418 Square feet or 1,711 Square metres
Displacement factor (Displacement / loading): 306 %
Structure weight / hull surface area: 72 lbs/sq ft or 353 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.61
- Overall: 1.00
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

Notes:
3545 tons of low-stowed cargo simmed as fuel. Total cargo 5595 tons.
Range is actually 8,000nm at 16.00 kts (Bunker at max displacement = 1,734 tons)

Ships in Class:
- Camerone
- Tuyen Quang
- Acheron
- Jules Verne
- Garonne
- Bougainville

[SIZE=3]Cephee, French Salvage Tug laid down 1940[/SIZE]

Displacement:
1,460 t light; 1,513 t standard; 2,046 t normal; 2,473 t full load

Dimensions: Length overall / water x beam x draught
219.31 ft / 213.25 ft x 39.37 ft x 16.40 ft (normal load)
66.85 m / 65.00 m x 12.00 m x 5.00 m

Armament:
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.89kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1940 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1940 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 9 lbs / 4 kg
Shells per gun, main battery: 2,000

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 3,639 shp / 2,715 Kw = 16.50 kts
Range 12,500nm at 14.00 kts
Bunker at max displacement = 960 tons

Complement:
151 - 197

Cost:
£0.394 million / $1.576 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.1 %
Machinery: 97 tons, 4.8 %
Hull, fittings & equipment: 1,161 tons, 56.7 %
Fuel, ammunition & stores: 587 tons, 28.7 %
Miscellaneous weights: 200 tons, 9.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,905 lbs / 3,132 Kg = 3,536.0 x 1.6 " / 40 mm shells or 3.4 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 1.6 ft / 0.5 m
Roll period: 13.2 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.31

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.520
Length to Beam Ratio: 5.42 : 1
'Natural speed' for length: 14.60 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15.75 ft / 4.80 m
- Forecastle (20 %): 12.80 ft / 3.90 m
- Mid (50 %): 8.86 ft / 2.70 m
- Quarterdeck (15 %): 10.83 ft / 3.30 m
- Stern: 12.80 ft / 3.90 m
- Average freeboard: 11.26 ft / 3.43 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 28.7 %
- Above water (accommodation/working, high = better): 74.0 %
Waterplane Area: 5,698 Square feet or 529 Square metres
Displacement factor (Displacement / loading): 507 %
Structure weight / hull surface area: 125 lbs/sq ft or 610 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.27
- Longitudinal: 8.12
- Overall: 2.58
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weight:
- 30 tons salvage crane
- 75 tons towing equipment
- 15 tons ASW fit
- 20 tons high-capacity pumps
- 25 tons reserved for diving bell/sub rescue apparatus
- 35 tons subsidiary low-speed towing diesel

A good workman-like design. Some might consider the range excessive but under a tow fuel consumption might be far more than under normal conditions. I also like the reserve hull strength.

Quoted

Originally posted by BruceDuncan
A good workman-like design. Some might consider the range excessive but under a tow fuel consumption might be far more than under normal conditions.

That was my line of thinking, yes.

Alternate version with a bigger deck gun.

Quoted

[SIZE=3]Cephee, French Salvage Tug laid down 1940[/SIZE]

Displacement:
1,484 t light; 1,534 t standard; 2,046 t normal; 2,456 t full load

Dimensions: Length overall / water x beam x draught
219.31 ft / 213.25 ft x 39.37 ft x 16.40 ft (normal load)
66.85 m / 65.00 m x 12.00 m x 5.00 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1940 Model
Anti-aircraft gun in deck mount
on centreline forward
2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1940 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 800

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 3,639 shp / 2,715 Kw = 16.50 kts
Range 12,000nm at 14.00 kts
Bunker at max displacement = 922 tons

Complement:
151 - 197

Cost:
£0.404 million / $1.617 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.1 %
Machinery: 97 tons, 4.8 %
Hull, fittings & equipment: 1,184 tons, 57.9 %
Fuel, ammunition & stores: 562 tons, 27.5 %
Miscellaneous weights: 200 tons, 9.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,844 lbs / 3,104 Kg = 531.7 x 3.0 " / 75 mm shells or 3.4 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.6 ft / 0.5 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 1.30

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.520
Length to Beam Ratio: 5.42 : 1
'Natural speed' for length: 14.60 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15.75 ft / 4.80 m
- Forecastle (20 %): 12.80 ft / 3.90 m
- Mid (50 %): 8.86 ft / 2.70 m
- Quarterdeck (15 %): 10.83 ft / 3.30 m
- Stern: 12.80 ft / 3.90 m
- Average freeboard: 11.26 ft / 3.43 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 28.9 %
- Above water (accommodation/working, high = better): 74.0 %
Waterplane Area: 5,698 Square feet or 529 Square metres
Displacement factor (Displacement / loading): 497 %
Structure weight / hull surface area: 127 lbs/sq ft or 622 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.31
- Longitudinal: 8.28
- Overall: 2.62
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weight:
- 30 tons salvage crane
- 75 tons towing equipment
- 15 tons ASW fit
- 20 tons high-capacity pumps
- 25 tons reserved for diving bell/sub rescue apparatus
- 35 tons subsidiary low-speed towing diesel

There isn't much reason for the ASW fit is she can't handle a surfaced sub.

Can't really see why a salvage tug needs ASW weapons. The 75mm should be pretty useful though.