Re: Netherlands design study for 1921 program

[damocles]

K-class (Improved I class., Holland  torpedojager laid down 1920

Displacement:
  1,497 t light; 1,586 t standard; 1,874 t normal; 2,103 t full load

Dimensions: Length overall / water x beam x draught
  393.70 ft / 393.70 ft x 33.46 ft x 12.14 ft (normal load)
  120.00 m / 120.00 m x 10.20 m - If you make this 12.00 m it will be better I think  x 3.70 m

It only works at 1700 tons up, I think.
===================================

Armament:
     6 - 5.91" / 150 mm guns (3x2 guns), 102.98lbs / 46.71kg shells - I think Korped used 45.00kg shells, 1920 Model
    Quick firing guns in deck mounts with hoists
    on centreline ends, majority aft, 1 raised mount aft - superfiring
    Main guns limited to end-on fire
     16 - 0.59" / 15.0 mm guns (8x2 guns), 0.10lbs / 0.05kg shells, 1920 Model
    Machine guns in deck mounts
    on side, evenly spread
  Weight of broadside 619 lbs / 281 kg
  Shells per gun, main battery: 150
  8 - 21.0" / 533.4 mm above water torpedoes

Armour:
  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
  Main:   0.39" / 10 mm   0.39" / 10 mm      0.39" / 10 mm

Machinery:
  Oil fired boilers, steam turbines,
  Geared drive, 2 shafts, 25,576 shp / 19,080 Kw = 30.00 kts
  Range 9,000nm at 12.00 kts
  Bunker at max displacement = 517 tons

Complement:
  142 - 185

Cost:
  £0.524 million / $2.095 million

Distribution of weights at normal displacement:
  Armament: 77 tons, 4.1 %
  Armour: 10 tons, 0.5 %
     - Belts: 0 tons, 0.0 %
     - Torpedo bulkhead: 0 tons, 0.0 %
     - Armament: 10 tons, 0.5 %
     - Armour Deck: 0 tons, 0.0 %
     - Conning Tower: 0 tons, 0.0 %
  Machinery: 744 tons, 39.7 % - Still too light IMHO
Maybe, but that 10% weight penalty is not worth a another knot and a half. Not realistically when I need the other ship qualities more.

  Hull, fittings & equipment: 568 tons, 30.3 %
  Fuel, ammunition & stores: 376 tons, 20.1 %
  Miscellaneous weights: 98 tons, 5.2 %

Overall survivability and seakeeping ability:
  Survivability (Non-critical penetrating hits needed to sink ship):
    510 lbs / 231 Kg = 5.0 x 5.9 " / 150 mm shells or 0.3 torpedoes
  Stability (Unstable if below 1.00): 1.18
  Metacentric height 1.3 ft / 0.4 m
  Roll period: 12.3 seconds
  Steadiness   - As gun platform (Average = 50 %): 62 %
        - Recoil effect (Restricted arc if above 1.00): 1.00 - Beam increase needed to lower this

Does it have to be <0.99?

  Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
  Hull has rise forward of midbreak
  Block coefficient: 0.410
  Length to Beam Ratio: 11.76 : 1
  'Natural speed' for length: 19.84 kts
  Power going to wave formation at top speed: 57 %
  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 %):   13.78 ft / 4.20 m
     - Mid (40 %):      14.11 ft / 4.30 m (10.83 ft / 3.30 m aft of break)
     - Quarterdeck (10 %):   10.83 ft / 3.30 m
     - Stern:      10.83 ft / 3.30 m
     - Average freeboard:   12.25 ft / 3.73 m
  Ship tends to be wet forward

Ship space, strength and comments:
  Space   - Hull below water (magazines/engines, low = better): 165.5 %
     - Above water (accommodation/working, high = better): 74.6 %
  Waterplane Area: 8,159 Square feet or 758 Square metres
  Displacement factor (Displacement / loading): 74 %
  Structure weight / hull surface area: 39 lbs/sq ft or 192 Kg/sq metre
  Hull strength (Relative):
     - Cross-sectional: 0.53 - Over built
quite possibly, but its the only number in a dozen variables that allows me a 30 knot/9000 mile/6" gunned destroyer   
     - Longitudinal: 0.92
     - Overall: 0.56
  Hull space for machinery, storage, compartmentation is cramped
  Room for accommodation and workspaces is cramped

90 tons   available                  
1915 radar                25 tons
1918 toepedoes      24 tons
ASW gear.                 25 tons
Misc.#                           16 tons

# Depth charges or mines.

If I increase the beam I raise the tonnage and I already pushed the block coefficient and freeboard as fine as I dare to fix this. The only margin I have left is misc. I can scrape by with 10 tons less but that doesn't affect the recoil.

About Korpen's artillery, the question is how do I springsharp a lighter shell? especially as I want the 5.9 QF guns? If I stick with year 1900 cruiser bag charge guns, my RoF is less than 4 shells a minute. With 1915 brass cased and ram assist its about 8.  

====================================

TC reply. The British used radio direction finding to shoot down Zeppelins at a hundred miles from their receivers in 1917.  Radiolocation is almost 93 years old. Hastameyer's sets were not fitted to ships at all-ever. .  Yet there it was in 1915. Now Holland spent six years and $12 Riksdollars in the game on a 25 ton blob detector that does what Hastameyer actually did on his own in 1912 for about $135,000 real dollars . It may be useless beyond 5000+ meters, but its there.

Which would you fit, the 25 ton blob detector that gives you some kind of bearing and range to ~ 5000 meters so that your direct fire telescopic optics can at least point at something detected out there in the dark, or nothing at all, considering that you cannot fit a 100 ton fire control optic in a destroyer to do that thing?  

I just consider it useful. If nothing else it can serve as a navigation aid and save some groundings ?

D.          

[TexanCowboy]

Navigation Aid....now there we're talking. Sorry about the rather rude responses, we were dealing with a player over at Wesworld a few months back that was trying to introduce things like guided torpedoes in 1935, and I've been a tad bit paranoid ever since.

My main issue with this would be the issue of height. A destroyer cannot have a very tall mainmast to put this on, and it isn't going to be able to support the weight as high up as a capital ship. I would expect this to be useful more at night and bad weather than actually managing to detect a enemy, unless it was a capital ship.

[damocles]

Navigation Aid....now there we're talking. Sorry about the rather rude responses, we were dealing with a player over at Wesworld a few months back that was trying to introduce things like guided torpedoes in 1935, and I've been a tad bit paranoid ever since.

I wanted to see what a Hastamayer set was supposed to do. 5000 meters is what is stated. That is what I will assume unless someone can prove different.  Navigation aid suits me as a ruling.    

My main issue with this would be the issue of height. A destroyer cannot have a very tall mainmast to put this on, and it isn't going to be able to support the weight as high up as a capital ship. I would expect this to be useful more at night and bad weather than actually managing to detect a enemy, unless it was a capital ship.

Let me do a radar horizon check at say 10 meters above sea level? That's about 13,000 meters. Is that a fair navigation range limit check for such a set? Could be we set detection threshhold at 1/2 that? Note that the fire control optical horizon at that height is 11,000 meters.

Of course the taller h2 is to h1, the farther away the blob will show up as a detected object.  

[Borys]

Let me do a radar horizon check at say 10 meters above sea level? That's about 13,000 meters. Is that a fair navigation range limit check for such a set? Could be we set detection threshhold at 1/2 that? Note that the fire control optical horizon at that height is 11,000 meters.
Of course the taller h2 is to h1, the farther away the blob will show up as a detected object.   

Hopefully sometimes it will work as advertised, sometimes it will miss the MN Brittanie, and sometimes it will see Things Which Were Not ...
Borys

[damocles]

The mysteries of radar are ever complex. Sometimes you can get a return off a sparrow at 300 miles, sometimes the oil tanker is right in  front of you and the radar says there is nothing there.

Its why we have mods. They can tell me I never saw the oil tanker, even though I had the radar running. Fair is fair. I hit it, I sink.

D.

     

[Sachmle]

Simming lighter shells is easy. Just change the shell weight in Springsharp.

[damocles]

Thank you very much.

[P3D]

What the Huelsmeyer device can do, is to tell you that there's some high radio reflectivity object, well... in this quadrant, within the sensitivity range of the device. The aperture is too small (and wavelength too long) so the divergence of the beam is way too large to get any accurate bearing measurement - or why mid-WWII radars were good at ranging, but not for bearing.
About range, it won't be able to tell anything either, as Huelsmeyer's original ranging idea relied on angle measurement,

NB, there are quite a few (r)evolutionary applications that theoretically could have been made to work even with pre-Great War technology, given access to a time-traveller engineer.

[damocles]

Here are a pair of torpedo boats to look at.

MTB A class , Holland Oscar ! 1920

Displacement:
   200 t light; 206 t standard; 228 t normal; 246 t full load

Dimensions: Length overall / water x beam x draught
   194.88 ft / 194.88 ft x 16.40 ft x 6.56 ft (normal load)
   59.40 m / 59.40 m x 5.00 m  x 2.00 m

Armament:
      4 - 1.97" / 50.0 mm guns (2x2 guns), 3.81lbs / 1.73kg shells, 1920 Model
     Quick firing guns in deck mounts
     on centreline, all forward, 1 raised mount - superfiring
      4 - 0.59" / 15.0 mm guns (2x2 guns), 0.10lbs / 0.05kg shells, 1920 Model
     Machine guns in deck mounts
     on centreline, all aft, 1 raised mount - superfiring
   Weight of broadside 16 lbs / 7 kg
   Shells per gun, main battery: 150
   4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
   Diesel Internal combustion motors,
   Geared drive, 2 shafts, 7,179 shp / 5,356 Kw = 28.00 kts
   Range 2,400nm at 12.00 kts
   Bunker at max displacement = 40 tons

Complement:
   29 - 38

Cost:
   £0.061 million / $0.242 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.9 %
   Machinery: 121 tons, 53.1 %
   Hull, fittings & equipment: 73 tons, 31.9 %
   Fuel, ammunition & stores: 28 tons, 12.3 %
   Miscellaneous weights: 4 tons, 1.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     54 lbs / 24 Kg = 14.1 x 2.0 " / 50 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 0.99
   Metacentric height 0.3 ft / 0.1 m
   Roll period: 12.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 54 %
         - Recoil effect (Restricted arc if above 1.00): 0.16
   Seaboat quality  (Average = 1.00): 0.84

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.381
   Length to Beam Ratio: 11.88 : 1
   'Natural speed' for length: 13.96 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 65
   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:      11.81 ft / 3.60 m
      - Forecastle (18 %):   10.50 ft / 3.20 m
      - Mid (30 %):      10.50 ft / 3.20 m (6.56 ft / 2.00 m aft of break)
      - Quarterdeck (15 %):   6.23 ft / 1.90 m
      - Stern:      7.38 ft / 2.25 m
      - Average freeboard:   7.78 ft / 2.37 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 180.0 %
      - Above water (accommodation/working, high = better): 12.6 %
   Waterplane Area: 1,950 Square feet or 181 Square metres
   Displacement factor (Displacement / loading): 44 %
   Structure weight / hull surface area: 17 lbs/sq ft or 83 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 2.19
      - Overall: 0.58
   Caution: Poor stability - excessive risk of capsizing
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

=============================================

A bit heavier in the artillery here:

MTB A class , Holland ship type torpedoboot  1920

Displacement:
   200 t light; 207 t standard; 230 t normal; 247 t full load

Dimensions: Length overall / water x beam x draught
   195.87 ft / 195.87 ft x 16.40 ft x 6.56 ft (normal load)
   59.70 m / 59.70 m x 5.00 m  x 2.00 m

Armament:
      2 - 2.95" / 75.0 mm guns (1x2 guns), 12.87lbs / 5.84kg shells, 1920 Model
     Quick firing guns in deck mount
     on centreline forward
      4 - 0.59" / 15.0 mm guns (2x2 guns), 0.10lbs / 0.05kg shells, 1920 Model
     Machine guns in deck mounts
     on centreline, all aft, 1 raised mount - superfiring
   Weight of broadside 26 lbs / 12 kg
   Shells per gun, main battery: 150
   4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
   Diesel Internal combustion motors,
   Geared drive, 2 shafts, 7,174 shp / 5,352 Kw = 28.00 kts
   Range 2,400nm at 12.00 kts
   Bunker at max displacement = 40 tons

Complement:
   29 - 38

Cost:
   £0.063 million / $0.251 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 1.4 %
   Machinery: 120 tons, 52.3 %
   Hull, fittings & equipment: 74 tons, 32.3 %
   Fuel, ammunition & stores: 29 tons, 12.7 %
   Miscellaneous weights: 3 tons, 1.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     56 lbs / 25 Kg = 4.3 x 3.0 " / 75 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.00
   Metacentric height 0.3 ft / 0.1 m
   Roll period: 11.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 55 %
         - Recoil effect (Restricted arc if above 1.00): 0.22
   Seaboat quality  (Average = 1.00): 0.84

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.381
   Length to Beam Ratio: 11.94 : 1
   'Natural speed' for length: 14.00 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 65
   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:      11.81 ft / 3.60 m
      - Forecastle (18 %):   10.50 ft / 3.20 m
      - Mid (30 %):      10.50 ft / 3.20 m (6.56 ft / 2.00 m aft of break)
      - Quarterdeck (15 %):   6.23 ft / 1.90 m
      - Stern:      7.38 ft / 2.25 m
      - Average freeboard:   7.78 ft / 2.37 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 181.0 %
      - Above water (accommodation/working, high = better): 13.1 %
   Waterplane Area: 1,960 Square feet or 182 Square metres
   Displacement factor (Displacement / loading): 43 %
   Structure weight / hull surface area: 17 lbs/sq ft or 84 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 2.18
      - Overall: 0.58
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather



===============================================

Overgunned, SLOW as molasses, these are second class warships, but they are CHEAP, 

[TexanCowboy]

Have you used the speed calculator in the rules? That normally juts up the speed 4-5 knots.

[Sachmle]

Have you used the speed calculator in the rules? That normally juts up the speed 4-5 knots.

I did, they both come in over 33kts.

[damocles]

Have you used the speed calculator in the rules? That normally juts up the speed 4-5 knots.

I did, they both come in over 33kts.

I thought those were trials speeds?

[maddox]

Yes, the Guinness Trial Speed calculator gives trial speeds, but for our purposes, it depends on a lot of variables if a ship can achive such speeds during operations.  Like, just after build/refit, full load on the start of a journey, or light after a long journey, after a prolonged fight, access to good fuel or not, and so on.

It's our way to deal with the SS bias concerning lighter combattants.

[eltf177]

Here are a pair of torpedo boats to look at.

MTB A class , Holland Oscar ! 1920
   Caution: Poor stability - excessive risk of capsizing

Bit of a problem here. Also, misc. weight insufficient for torpedoes.

[damocles]

Here are a pair of torpedo boats to look at.

MTB A class , Holland Oscar ! 1920
   Caution: Poor stability - excessive risk of capsizing

Bit of a problem here. Also, misc. weight insufficient for torpedoes.

=======================================

MTB C class , Holland torpedoboot laid down 1920

Displacement:
   247 t light; 257 t standard; 282 t normal; 302 t full load

Dimensions: Length overall / water x beam x draught
   193.45 ft / 190.29 ft x 16.40 ft (Bulges 19.69 ft) x 5.64 ft (normal load)
   58.96 m / 58.00 m x 5.00 m (Bulges 6.00 m)  x 1.72 m

Armament:
     4 - 2.95" / 75.0 mm guns (2x2 guns), 12.87lbs / 5.84kg shells, 1920 Model
     Quick firing guns in deck mounts
     on centreline, all forward, 1 raised mount - superfiring
     4 - 0.59" / 15.0 mm guns (2x2 guns), 0.10lbs / 0.05kg shells, 1920 Model
     Machine guns in deck mounts
     on centreline, all aft, 1 raised mount - superfiring
   Weight of broadside 52 lbs / 24 kg
   Shells per gun, main battery: 150
   4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
   Diesel Internal combustion motors,
   Geared drive, 2 shafts, 7,876 shp / 5,875 Kw = 27.00 kts
   Range 2,400nm at 12.00 kts
   Bunker at max displacement = 46 tons

Complement:
   33 - 44

Cost:
   £0.079 million / $0.317 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 2.3 %
   Machinery: 139 tons, 49.2 %
   Hull, fittings & equipment: 89 tons, 31.7 %
   Fuel, ammunition & stores: 36 tons, 12.6 %
   Miscellaneous weights: 12 tons, 4.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     66 lbs / 30 Kg = 5.2 x 3.0 " / 75 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.00
   Metacentric height 0.3 ft / 0.1 m
   Roll period: 14.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 55 %
         - Recoil effect (Restricted arc if above 1.00): 0.31
   Seaboat quality  (Average = 1.00): 0.76

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.467
   Length to Beam Ratio: 9.67 : 1
   'Natural speed' for length: 13.79 kts
   Power going to wave formation at top speed: 72 %
   Trim (Max stability = 0, Max steadiness = 100): 73
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      11.81 ft / 3.60 m
      - Forecastle (20 %):   10.50 ft / 3.20 m
      - Mid (50 %):      7.22 ft / 2.20 m
      - Quarterdeck (10 %):   7.22 ft / 2.20 m
      - Stern:      7.22 ft / 2.20 m
      - Average freeboard:   8.47 ft / 2.58 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 181.0 %
      - Above water (accommodation/working, high = better): 10.8 %
   Waterplane Area: 2,020 Square feet or 188 Square metres
   Displacement factor (Displacement / loading): 46 %
   Structure weight / hull surface area: 19 lbs/sq ft or 92 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 2.52
      - Overall: 0.59
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Notes: Using speed calculator, 31 knots.
==============================================

rMTB C class , Holland FPB-A laid down 1920

Displacement:
   249 t light; 260 t standard; 285 t normal; 305 t full load

Dimensions: Length overall / water x beam x draught
   223.55 ft / 219.82 ft x 21.98 ft x 5.41 ft (normal load)
   68.14 m / 67.00 m x 6.70 m  x 1.65 m

Armament:
      4 - 2.95" / 75.0 mm guns (2x2 guns), 12.87lbs / 5.84kg shells, 1920 Model
     Quick firing guns in deck mounts
     on centreline, all forward, 1 raised mount - superfiring
      16 - 0.59" / 15.0 mm guns (8x2 guns), 0.10lbs / 0.05kg shells, 1920 Model
     Machine guns in deck mounts
     on side, all aft, 4 raised mounts - superfiring
   Weight of broadside 53 lbs / 24 kg
   Shells per gun, main battery: 150
   4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
   Diesel Internal combustion motors,
   Geared drive, 2 shafts, 5,788 shp / 4,318 Kw = 26.00 kts
   Range 2,400nm at 12.00 kts
   Bunker at max displacement = 45 tons

Complement:
   34 - 45

Cost:
   £0.077 million / $0.308 million

Distribution of weights at normal displacement:
   Armament: 7 tons, 2.3 %
   Machinery: 130 tons, 45.7 %
   Hull, fittings & equipment: 100 tons, 35.2 %
   Fuel, ammunition & stores: 36 tons, 12.5 %
   Miscellaneous weights: 12 tons, 4.2 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     97 lbs / 44 Kg = 7.5 x 3.0 " / 75 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.00
   Metacentric height 0.5 ft / 0.2 m
   Roll period: 12.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 81 %
         - Recoil effect (Restricted arc if above 1.00): 0.27
   Seaboat quality  (Average = 1.00): 0.89

Hull form characteristics:
   Hull has rise aft of midbreak
   Block coefficient: 0.381
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 14.83 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 91
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      13.94 ft / 4.25 m
      - Forecastle (30 %):   9.02 ft / 2.75 m
      - Mid (50 %):      6.89 ft / 2.10 m (9.02 ft / 2.75 m aft of break)
      - Quarterdeck (25 %):   6.89 ft / 2.10 m
      - Stern:      6.89 ft / 2.10 m
      - Average freeboard:   8.60 ft / 2.62 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 170.2 %
      - Above water (accommodation/working, high = better): 56.4 %
   Waterplane Area: 2,947 Square feet or 274 Square metres
   Displacement factor (Displacement / loading): 61 %
   Structure weight / hull surface area: 20 lbs/sq ft or 98 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.53
      - Longitudinal: 1.44
      - Overall: 0.59
   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
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Notes 12 tons ,misc.
4 tons nightfighting gear all versions

Subchaser/mine warfare  version lands torpedoes and replaces these weapons with
2 tons hydrophones.
6 tons depth charges or mines carried..
When sweeping mines, 6 tons of sweep gear carried.

   


Notes: average trial speed is 30 knots.

Those are gunboats designed for colonial defense.