Mine sweeper

[Borys]

M-1, Habsburg Minensuchboot laid down 1906 (Engine 1909)

Displacement:
   358 t light; 369 t standard; 416 t normal; 453 t full load

Dimensions: Length overall / water x beam x draught
   165,00 ft / 165,00 ft x 19,00 ft x 7,00 ft (normal load)
   50,29 m / 50,29 m x 5,79 m  x 2,13 m

Armament:
      1 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1906 Model
     Quick firing gun in deck mount
     on centreline forward
      2 - 0,43" / 11,0 mm guns in single mounts, 0,04lbs / 0,02kg shells, 1906 Model
     Machine guns in deck mounts
     on side, all amidships
   Weight of broadside 32 lbs / 15 kg
   Shells per gun, main battery: 150

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 1 shaft, 2 166 ihp / 1 616 Kw = 18,00 kts
   Range 2 500nm at 10,00 kts
   Bunker at max displacement = 84 tons (100% coal)

Complement:
   45 - 59

Cost:
   £0,039 million / $0,157 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 1,0%
   Machinery: 167 tons, 40,1%
   Hull, fittings & equipment: 137 tons, 33,1%
   Fuel, ammunition & stores: 58 tons, 13,9%
   Miscellaneous weights: 50 tons, 12,0%

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     255 lbs / 116 Kg = 8,0 x 4,0 " / 102 mm shells or 0,2 torpedoes
   Stability (Unstable if below 1.00): 1,22
   Metacentric height 0,6 ft / 0,2 m
   Roll period: 10,3 seconds
   Steadiness   - As gun platform (Average = 50 %): 61 %
         - Recoil effect (Restricted arc if above 1.00): 0,16
   Seaboat quality  (Average = 1.00): 1,53

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,663
   Length to Beam Ratio: 8,68 : 1
   'Natural speed' for length: 12,85 kts
   Power going to wave formation at top speed: 64 %
   Trim (Max stability = 0, Max steadiness = 100): 40
   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:      14,34 ft / 4,37 m
      - Forecastle (20%):   9,13 ft / 2,78 m
      - Mid (50%):      9,13 ft / 2,78 m
      - Quarterdeck (15%):   9,13 ft / 2,78 m
      - Stern:      9,13 ft / 2,78 m
      - Average freeboard:   9,55 ft / 2,91 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 150,1%
      - Above water (accommodation/working, high = better): 92,8%
   Waterplane Area: 2 401 Square feet or 223 Square metres
   Displacement factor (Displacement / loading): 100%
   Structure weight / hull surface area: 27 lbs/sq ft or 134 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,86
      - Longitudinal: 4,72
      - Overall: 1,02
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[swamphen]

What conditions might there be for providing this design to your fellow Germans?

[Alikchi]

I like the design, but you could do well building something smaller and cheaper. You really don't need anything faster than ten knots IMHO.

[Borys]

Runaway! Runaway!
That's what I need the speed for.

It is true I could cut the spped to 15-16 knots. Seriously, the speed is useful to get on station sooner, for redeployment, etc. The size also helps with seakeeping.

Borys

[P3D]

And if the ship is a bit larger, it can also be used as a minelayer.
That is the justification why Orange has relatively large minesweepers. In addition, the Orange Navy has to consider some serious seakeeping requirements, and range is also an issue.

[Borys]

Ahoj!

What conditions might there be for providing this design to your fellow Germans?

None.
Habsburg-Hohenzollern comaradie in arms is enough.
Copy the design to your heart's content.
Borys

[Desertfox]

*Begins plans for minesweeper killers* Ah! but I already have my own M-1s...

[Borys]

http://www.cerrahogullari.com.tr/ports/DARDANELLES%20(CANAKKALE)%20STRAIT.htm

I remember reading that the current made it difficult to minesweep the Dardanelles. 4 knots being the norm, I'm glad my ships can make 18 :)

Borys

[Korpen]

hm, i think my colonial gun boats will make perfect minesweepers...
Got to build more of them...

[swamphen]

hm, i think my colonial gun boats will make perfect minesweepers...

Once per gunboat, anyway.  :P

[Korpen]

hm, i think my colonial gun boats will make perfect minesweepers...

Once per gunboat, anyway.  :P

For that (mine braking) I will not use military ships, I simply charter a merchantman, load it full of wood (or something else that floats) and let it lead the way trough the minefield.

Very smalls ships has in fact a better chance to survive a mine hit then a medium sized one, as they are light enough so the blast will throw the entire ship away rather then smashing it to pieces. Also having a draft of less then 1m helps as well. :)

[Carthaginian]

For that (mine braking) I will not use military ships, I simply charter a merchantman, load it full of wood (or something else that floats) and let it lead the way trough the minefield.

Wood?

I wouldn't think that a good idea.
What happens when you DO knock a hole in the side of the ship, and the water does come in? Sure wood 'floats,' but it also swells and becomes waterlogged. I'd think that any benefit you'd gain by putting dry wood in the hold would be negated when that wood soaked up water and increased it's weight by quite a bit.

[maddox]

Q ships were regulary filled with cork or cellusose, to get more floating capacity when the hull is breeched.

[Carthaginian]

Q ships were regulary filled with cork or cellusose, to get more floating capacity when the hull is breeched.

Cork and industrially-refined cellulose are a lot less dense than wood.
Wood gets waterlogged enough to sink, less dense cork bark and refined cellulose don't. I was just wondering if there might be something better that could be used, like your two suggestions, rather than the wood blocks it sounded like he was intending to use.

[Korpen]

Cork and industrially-refined cellulose are a lot less dense than wood.
Wood gets waterlogged enough to sink, less dense cork bark and refined cellulose don't. I was just wondering if there might be something better that could be used, like your two suggestions, rather than the wood blocks it sounded like he was intending to use.

It rather depends on what kind of wood, and for how long it will be drenched.
And even waterlogged it weigh a lot less the just water. In effect it prevents the mine breaker from sinking at the first mine. :)
Add to that, wood has the rather nice advantage of being ceap and easy to get everywere, so it is what will be used if notinh better is around.