Brandenburger Transportdampfen

[Sachmle]

An effect of the latest war is the realization that we do not possess enough sea lift capability to adequately project our forces if needed. Therefore a larger version of the Hohenfriedburg klasse transportdampfen was required.

E Klasse, Brandenburger Transportdampfer laid down 1918 (Engine 1916)

Displacement:
   5,000 t light; 5,139 t standard; 6,130 t normal; 6,923 t full load

Dimensions: Length overall / water x beam x draught
   393.71 ft / 388.29 ft x 64.70 ft x 15.19 ft (normal load)
   120.00 m / 118.35 m x 19.72 m  x 4.63 m

Armament:
      4 - 4.13" / 105 mm guns in single mounts, 35.27lbs / 16.00kg shells, 1908 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      4 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1918 Model
     Quick firing guns in deck mounts
     on side ends, evenly spread
      4 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.01kg shells, 1918 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 147 lbs / 67 kg
   Shells per gun, main battery: 200

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm         -               -
   2nd:   0.98" / 25 mm         -               -
   3rd:   0.39" / 10 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 5,034 ihp / 3,755 Kw = 15.70 kts
   Range 8,000nm at 12.00 kts
   Bunker at max displacement = 1,783 tons (100% coal)

Complement:
   346 - 450

Cost:
   £0.473 million / $1.892 million

Distribution of weights at normal displacement:
   Armament: 18 tons, 0.3 %
   Armour: 11 tons, 0.2 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 11 tons, 0.2 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 329 tons, 5.4 %
   Hull, fittings & equipment: 1,641 tons, 26.8 %
   Fuel, ammunition & stores: 1,130 tons, 18.4 %
   Miscellaneous weights: 3,000 tons, 48.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     9,396 lbs / 4,262 Kg = 266.0 x 4.1 " / 105 mm shells or 2.0 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 14.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 1.54

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.562
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 19.71 kts
   Power going to wave formation at top speed: 37 %
   Trim (Max stability = 0, Max steadiness = 100): 32
   Bow angle (Positive = bow angles forward): 17.75 degrees
   Stern overhang: -2.46 ft / -0.75 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      16.93 ft / 5.16 m
      - Forecastle (20 %):   12.96 ft / 3.95 m
      - Mid (50 %):      12.80 ft / 3.90 m
      - Quarterdeck (15 %):   12.80 ft / 3.90 m
      - Stern:      12.80 ft / 3.90 m
      - Average freeboard:   13.17 ft / 4.01 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 73.7 %
      - Above water (accommodation/working, high = better): 125.3 %
   Waterplane Area: 17,734 Square feet or 1,648 Square metres
   Displacement factor (Displacement / loading): 161 %
   Structure weight / hull surface area: 71 lbs/sq ft or 344 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.21
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

2000t for 1000 troops
200t for 10 10t steam launches above normal ship's boats
700t cargo
25t Long range markoni
25t sehendes auge
50t reserve weight

[Borys]

Ahoj!
Can I license the design?
Borys

[Sachmle]

Ahoj!
Can I license the design?
Borys

Sure.

[The Rock Doctor]

I support the idea, but find the freeboard to be rather low for a transport that needs accommodation for a thousand.

[Sachmle]

I support the idea, but find the freeboard to be rather low for a transport that needs accommodation for a thousand.

Fair enough...I didn't really look. I'll tweek it. How's this?

E Klasse, Brandenburger Transportdampfer laid down 1918 (Engine 1916)

Displacement:
   5,350 t light; 5,497 t standard; 6,500 t normal; 7,303 t full load

Dimensions: Length overall / water x beam x draught
   393.70 ft / 388.29 ft x 64.70 ft x 17.55 ft (normal load)
   120.00 m / 118.35 m x 19.72 m  x 5.35 m

Armament:
      4 - 4.13" / 105 mm guns in single mounts, 35.27lbs / 16.00kg shells, 1908 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      4 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1918 Model
     Quick firing guns in deck mounts
     on side ends, evenly spread
      4 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.00kg shells, 1918 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 147 lbs / 67 kg
   Shells per gun, main battery: 200

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm         -               -
   2nd:   0.98" / 25 mm         -               -
   3rd:   0.39" / 10 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 5,000 ihp / 3,730 Kw = 15.63 kts
   Range 8,000nm at 12.00 kts
   Bunker at max displacement = 1,806 tons (100% coal)

Complement:
   361 - 470

Cost:
   £0.497 million / $1.988 million

Distribution of weights at normal displacement:
   Armament: 18 tons, 0.3 %
   Armour: 11 tons, 0.2 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 11 tons, 0.2 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 327 tons, 5.0 %
   Hull, fittings & equipment: 1,993 tons, 30.7 %
   Fuel, ammunition & stores: 1,150 tons, 17.7 %
   Miscellaneous weights: 3,000 tons, 46.2 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     12,912 lbs / 5,857 Kg = 365.6 x 4.1 " / 105 mm shells or 2.3 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 3.3 ft / 1.0 m
   Roll period: 15.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.516
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 19.71 kts
   Power going to wave formation at top speed: 36 %
   Trim (Max stability = 0, Max steadiness = 100): 25
   Bow angle (Positive = bow angles forward): 12.40 degrees
   Stern overhang: -2.46 ft / -0.75 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      24.61 ft / 7.50 m
      - Forecastle (20 %):   21.33 ft / 6.50 m
      - Mid (50 %):      21.33 ft / 6.50 m
      - Quarterdeck (15 %):   21.33 ft / 6.50 m
      - Stern:      21.33 ft / 6.50 m
      - Average freeboard:   21.59 ft / 6.58 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 69.5 %
      - Above water (accommodation/working, high = better): 191.1 %
   Waterplane Area: 16,984 Square feet or 1,578 Square metres
   Displacement factor (Displacement / loading): 170 %
   Structure weight / hull surface area: 77 lbs/sq ft or 374 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.65
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

2000t for 1000 troops
200t for 10 10t steam launches above normal ship's boats
700t cargo
25t Long range markoni
25t sehendes auge
50t reserve weight

[The Rock Doctor]

Thumbs up.

[TexanCowboy]

You can carry 20 launches, not 10.

[Sachmle]

You can carry 20 launches, not 10.

Miscellaneous Weights

This will be added to as new items are suggested or become available.

Boats:  Typical ship's boats are part of fittings.  Extra boats, landing craft, or attack craft require 2 t of miscellaneous weight per tonne of boat weight:  the difference accounts for cranes and hull reinforcements.

10t boat = 20t misc weight. 10 boats x 20t each= 200t.

[TexanCowboy]

Oh, ok.