Bavarian GTB

[Borys]

GTB 1905, Koenigreich Bayern laid down 1906
10 vessels, T1-5 and M6-10 built in 1906/7

Displacement:
   499 t light; 518 t standard; 557 t normal; 589 t full load

Dimensions: Length overall / water x beam x draught
   229,66 ft / 229,66 ft x 16,08 ft x 9,68 ft (normal load)
   70,00 m / 70,00 m x 4,90 m  x 2,95 m

Armament:
      2 - 3,00" / 76,2 mm guns in single mounts, 13,50lbs / 6,12kg shells, 1905 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread
   Weight of broadside 27 lbs / 12 kg
   Shells per gun, main battery: 500
   3 - 14,0" / 356 mm above water torpedoes

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 12 380 shp / 9 235 Kw = 28,00 kts
   Range 600nm at 14,00 kts
   Bunker at max displacement = 72 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   56 - 74

Cost:
   £0,065 million / $0,261 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 0,6%
   Machinery: 322 tons, 57,7%
   Hull, fittings & equipment: 168 tons, 30,1%
   Fuel, ammunition & stores: 58 tons, 10,5%
   Miscellaneous weights: 6 tons, 1,1%

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     127 lbs / 58 Kg = 9,4 x 3,0 " / 76 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,16
   Metacentric height 0,4 ft / 0,1 m
   Roll period: 10,3 seconds
   Steadiness   - As gun platform (Average = 50 %): 74 %
         - Recoil effect (Restricted arc if above 1.00): 0,27
   Seaboat quality  (Average = 1.00): 1,47

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,546
   Length to Beam Ratio: 14,29 : 1
   'Natural speed' for length: 15,15 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 0,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      16,67 ft / 5,08 m
      - Forecastle (30%):   10,60 ft / 3,23 m
      - Mid (50%):      10,60 ft / 3,23 m
      - Quarterdeck (15%):   10,60 ft / 3,23 m
      - Stern:      10,60 ft / 3,23 m
      - Average freeboard:   11,33 ft / 3,45 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 192,9%
      - Above water (accommodation/working, high = better): 69,4%
   Waterplane Area: 2 567 Square feet or 238 Square metres
   Displacement factor (Displacement / loading): 27%
   Structure weight / hull surface area: 19 lbs/sq ft or 95 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,52
      - Longitudinal: 5,49
      - Overall: 0,66
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[Bazhell]

Here also only 5000 PS, and i want two 8,8 cm at the boats :) You constructed 5 at Triest and 5 at Monfalcone? What do you think will the harbour infrastructure look?

[Borys]

Ahoj!
You are wellcome to switch the guns. Won't make much difference on the design.
Infrstructure:

Trieste, Type 2 Port
Building
Type 2, slipway 170 meters/557 feet
Type 2, slipway 170 meters/557 feet
Type 2, slipway 170 meters/557 feet

Repair
Type 2, drydock 170 meters/557 feet
Type 1, drydock 120 meters/393 feet
Type 0, drydock 70 meters/230 feet

This is not covered by the game, but the STT (Stablimento Tecnico Triestino) is one of the most modern, efficient yards in the world.


Monfalcone - no military port facilities
Construction
Type 1, Slipway 120 meters/393 feet

Monfalcone can build quite good cruisers.


I'd say that all TBs were built at Triest. Maybe one or two at Monfalcone. Using drydocks for construction, the STT can build half a dozen in parallel. And building 10 of such small ships in 18 months is a piece of cake for them. In OTL they built, in parallel, two 25,000 battleships in just over
2 years. Under Mussolini they built a Littorio class ship in 3 and a half years ...

Borys

[Bazhell]

My first TB :)

TB 1907, Bavaria Torpedo Boat laid down 1907

Displacement:
   495 t light; 511 t standard; 557 t normal; 594 t full load

Dimensions: Length overall / water x beam x draught
   229,66 ft / 229,66 ft x 22,97 ft x 9,84 ft (normal load)
   70,00 m / 70,00 m x 7,00 m  x 3,00 m

Armament:
      2 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1907 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread
   Weight of broadside 42 lbs / 19 kg
   Shells per gun, main battery: 200
   3 - 20,0" / 508 mm above water torpedoes

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 10.961 shp / 8.177 Kw = 27,50 kts
   Range 2.500nm at 10,00 kts
   Bunker at max displacement = 83 tons

Complement:
   56 - 74

Cost:
   £0,063 million / $0,253 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 0,9%
   Machinery: 297 tons, 53,3%
   Hull, fittings & equipment: 187 tons, 33,6%
   Fuel, ammunition & stores: 62 tons, 11,1%
   Miscellaneous weights: 6 tons, 1,1%

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     184 lbs / 83 Kg = 8,8 x 3,5 " / 88 mm shells or 0,2 torpedoes
   Stability (Unstable if below 1.00): 1,28
   Metacentric height 0,9 ft / 0,3 m
   Roll period: 10,4 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0,12
   Seaboat quality  (Average = 1.00): 1,19

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,376
   Length to Beam Ratio: 10,00 : 1
   'Natural speed' for length: 15,15 kts
   Power going to wave formation at top speed: 66 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   Bow angle (Positive = bow angles forward): 0,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      16,14 ft / 4,92 m
      - Forecastle (20%):   10,27 ft / 3,13 m
      - Mid (50%):      10,27 ft / 3,13 m
      - Quarterdeck (15%):   10,27 ft / 3,13 m
      - Stern:      10,27 ft / 3,13 m
      - Average freeboard:   10,74 ft / 3,27 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 180,6%
      - Above water (accommodation/working, high = better): 72,3%
   Waterplane Area: 3.211 Square feet or 298 Square metres
   Displacement factor (Displacement / loading): 43%
   Structure weight / hull surface area: 26 lbs/sq ft or 128 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,59
      - Longitudinal: 3,36
      - Overall: 0,71
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

[Carthaginian]

I like it a lot!
Small, fast enough, easy to build and cheap.

[Korpen]

Strange things start to happen with springsharp when the block coefficient gets below 0,38, so you should try and raise it, considering that you got a bit of excess hull strength, just reducing her draft a few cm should do the trick..
Other then that she is not bad ship at all, she is cheap, her speed is nice, and her sea keeping acceptable.
But if I were to suggest some modification to her, it would be to raise her forecastle, you got a bit of extra strength in the design, and a higher forecastle would improve her sea keeping as well as the accommodations for the crew.

[Borys]

Ahoj!
You can cut back on range. This ship isn't going anywhere furtherthan the Strait of Otranto.
Borys

[P3D]

You might want to consider higher cruise speeds if you are restricted to the Adriatic - even like 20 knots.

[Bazhell]

TB 1907, Bavaria Torpedo Boat laid down 1907

Displacement:
   498 t light; 517 t standard; 624 t normal; 709 t full load

Dimensions: Length overall / water x beam x draught
   229,66 ft / 229,66 ft x 19,69 ft x 9,84 ft (normal load)
   70,00 m / 70,00 m x 6,00 m  x 3,00 m

Armament:
      3 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1907 Model
     Breech loading guns in deck mounts
     on centreline, evenly spread
     Aft Main mounts separated by engine room
   Weight of broadside 62 lbs / 28 kg
   Shells per gun, main battery: 200
   4 - 20,0" / 508 mm above water torpedoes

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 11.413 shp / 8.514 Kw = 27,00 kts
   Range 1.500nm at 15,00 kts
   Bunker at max displacement = 192 tons (100% coal)

Complement:
   62 - 81

Cost:
   £0,070 million / $0,282 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1,2%
   Machinery: 332 tons, 53,1%
   Hull, fittings & equipment: 150 tons, 24,1%
   Fuel, ammunition & stores: 126 tons, 20,2%
   Miscellaneous weights: 8 tons, 1,3%

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     134 lbs / 61 Kg = 6,4 x 3,5 " / 88 mm shells or 0,2 torpedoes
   Stability (Unstable if below 1.00): 1,17
   Metacentric height 0,6 ft / 0,2 m
   Roll period: 10,8 seconds
   Steadiness   - As gun platform (Average = 50 %): 82 %
         - Recoil effect (Restricted arc if above 1.00): 0,34
   Seaboat quality  (Average = 1.00): 1,37

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0,491
   Length to Beam Ratio: 11,67 : 1
   'Natural speed' for length: 15,15 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   Bow angle (Positive = bow angles forward): 0,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      16,40 ft / 5,00 m
      - Forecastle (20%):   16,40 ft / 5,00 m (10,27 ft / 3,13 m aft of break)
      - Mid (50%):      10,27 ft / 3,13 m
      - Quarterdeck (15%):   10,27 ft / 3,13 m
      - Stern:      10,27 ft / 3,13 m
      - Average freeboard:   11,50 ft / 3,50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 182,8%
      - Above water (accommodation/working, high = better): 42,1%
   Waterplane Area: 2.987 Square feet or 278 Square metres
   Displacement factor (Displacement / loading): 42%
   Structure weight / hull surface area: 18 lbs/sq ft or 90 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,45
      - Longitudinal: 3,42
      - Overall: 0,55
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

added 1 gun and shortend range, as Otranto is only 600 km one way...

[Borys]

Ahoj!
IMO perfect for the job.
Borys

[Carthaginian]

WOW... and a 15 knot cruise speed to boot!
That's quite a tin can, there. Excellent design.

[The Rock Doctor]

I hate to be a stick in the mud, but the cross-sectional strength should be at least 0.50.  If you were to reduce the block co-efficient to about .42 or .43, and increase the draft to ~3.2 m, you'd probably have the same displacement, need less machinery for the speed, and a stronger hull.

[Bazhell]

You are welcome, Bavaria has a lot to learn right now.

[Carthaginian]

I hate to be a stick in the mud, but the cross-sectional strength should be at least 0.50.  If you were to reduce the block co-efficient to about .42 or .43, and increase the draft to ~3.2 m, you'd probably have the same displacement, need less machinery for the speed, and a stronger hull.

DOH!
Didn't notice that... thanks for keeping us straight, Rock!

[The Rock Doctor]

I guess somebody has to be the bad guy...

Bazhell - there's always a learning curve.  My first designs in springstyle were absolute disasters, and I've made quite a few mediocre ones since then.