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1

Thursday, May 19th 2011, 1:42am

New German Designs for 1942

Placeholder for designs projected for the 1942 Program of Construction

2

Thursday, May 19th 2011, 1:43am

Support Tanker

Tanker R, German Support Tanker laid down 1942

Displacement: 1,952 t light; 2,087 t standard; 6,700 t normal; 10,390 t full load

Dimensions: Length overall / water x beam x draught

366.07 ft / 355.97 ft x 45.93 ft x 20.18 ft (normal load) [111.58 m / 108.50 m x 14.00 m x 6.15 m]

Armament:

2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1938 Model Anti-aircraft guns in deck mount on centreline aft
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, all aft
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 500

Machinery:

Diesel Internal combustion motors, Geared drive, 1 shaft, 9,016 shp / 6,726 Kw = 18.00 kts
Range 50,000nm at 15.00 kts
Bunker at max displacement = 8,304 tons

Complement: 369 - 481

Cost: £0.647 million / $2.588 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Machinery: 236 tons, 3.5 %
Hull, fittings & equipment: 1,416 tons, 21.1 %
Fuel, ammunition & stores: 4,748 tons, 70.9 %
Miscellaneous weights: 300 tons, 4.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 44,183 lbs / 20,041 Kg = 28,588.0 x 1.5 " / 37 mm shells or 9.8 torpedoes
Stability (Unstable if below 1.00): 1.68
Metacentric height 3.7 ft / 1.1 m
Roll period: 10.1 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.711
Length to Beam Ratio: 7.75: 1
'Natural speed' for length: 18.87 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 16.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.79 ft / 7.25 m
- Forecastle (15 %): 22.31 ft / 6.80 m (21.33 ft / 6.50 m aft of break)
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (15 %): 21.33 ft / 6.50 m (13.12 ft / 4.00 m before break)
- Stern: 21.33 ft / 6.50 m
- Average freeboard: 17.26 ft / 5.26 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 18.2 %
- Above water (accommodation/working, high = better): 103.1 %
Waterplane Area: 13,163 Square feet or 1,223 Square metres
Displacement factor (Displacement / loading): 865 %
Structure weight / hull surface area: 62 lbs/sq ft or 305 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.23
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Low stowed cargo simmed as additional bunkers. Normal radius is 6,000 nm at 15 knots.

Breakdown of low-stowed cargo: 3,000 tons bunker fuel oil, 880 tons diesel oil, 150 tons aviation spirit

Breakdown of miscellaneous weight:

120 tons reserved for deck gear and equipment for underway replenishment
100 tons reserved for provisions and other stores
80 tons reserved for munitions

3

Wednesday, May 25th 2011, 9:36pm

Improved Paderborn class Destroyer

Zerstorer Typ 1942 - Improved Paderborn, German Fleet Destroyer laid down 1942

Displacement: 1,919 t light; 2,033 t standard; 2,257 t normal; 2,437 t full load

Dimensions: Length overall / water x beam x draught

410.43 ft / 393.70 ft x 38.06 ft x 12.86 ft (normal load) [125.10 m / 120.00 m x 11.60 m x 3.92 m]

Armament:

6 - 5.04" / 128 mm guns (3x2 guns), 63.99lbs / 29.03kg shells, 1940 Model Dual purpose guns in deck mounts with hoists on centreline ends, majority forward, 1 raised mount - superfiring
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1940 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
16 - 0.79" / 20.0 mm guns (4x4 guns), 0.24lbs / 0.11kg shells, 1940 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 400 lbs / 182 kg
Shells per gun, main battery: 300
8 - 21.0" / 533 mm above water torpedoes

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.79" / 20 mm -
2nd: 0.59" / 15 mm 0.59" / 15 mm -
3rd: 0.59" / 15 mm - -

Conning tower: 1.57" / 40 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 36,628 shp / 27,324 Kw = 33.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 404 tons

Complement: 163 - 212

Cost: £1.521 million / $6.082 million

Distribution of weights at normal displacement:

Armament: 50 tons, 2.2 %
Armour: 28 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 22 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 6 tons, 0.3 %
Machinery: 927 tons, 41.1 %
Hull, fittings & equipment: 864 tons, 38.3 %
Fuel, ammunition & stores: 339 tons, 15.0 %
Miscellaneous weights: 50 tons, 2.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,053 lbs / 478 Kg = 16.5 x 5.0 " / 128 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 1.7 ft / 0.5 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 68 %
- Recoil effect (Restricted arc if above 1.00): 0.59
Seaboat quality (Average = 1.00): 1.34

Hull form characteristics:

Hull has rise forward of midbreak and transom stern
Block coefficient: 0.410
Length to Beam Ratio: 10.34 : 1
'Natural speed' for length: 22.85 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.29 ft / 7.10 m
- Forecastle (20 %): 21.98 ft / 6.70 m
- Mid (45 %): 21.98 ft / 6.70 m (13.78 ft / 4.20 m aft of break)
- Quarterdeck (15 %): 13.78 ft / 4.20 m
- Stern: 14.44 ft / 4.40 m
- Average freeboard: 17.62 ft / 5.37 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 153.9 %
- Above water (accommodation/working, high = better): 120.6 %
Waterplane Area: 9,631 Square feet or 895 Square metres
Displacement factor (Displacement / loading): 94 %
Structure weight / hull surface area: 44 lbs/sq ft or 216 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.56
- Longitudinal: 2.64
- Overall: 0.66
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Miscellaneous Weight - 50 tons, comprising

20 tons for radar outfit
20 tons for ASDIC/Sonar outfit
10 tons for design growth

4

Thursday, May 26th 2011, 4:10pm

Looks good to me. A perfect mix for a fleet destroyer.

5

Wednesday, June 8th 2011, 8:40pm

Proposed Light Seaplane Tender

Seaplane Tender E, German Light Seaplane Tender laid down 1942

Displacement: 1,042 t light; 1,078 t standard; 1,560 t normal; 1,945 t full load

Dimensions: Length overall / water x beam x draught

309.27 ft / 295.28 ft x 38.55 ft x 10.50 ft (normal load) [94.26 m / 90.00 m x 11.75 m x 3.20 m]

Armament:

1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1940 Model Dual purpose gun in deck mount on centreline forward
8 - 0.79" / 20.0 mm guns (2x4 guns), 0.24lbs / 0.11kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 37 lbs / 17 kg
Shells per gun, main battery: 250

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 3,644 shp / 2,718 Kw = 18.00 kts
Range 15,000nm at 14.00 kts
Bunker at max displacement = 867 tons

Complement: 123 - 161

Cost: £0.342 million / $1.367 million

Distribution of weights at normal displacement:

Armament: 5 tons, 0.3 %
Machinery: 95 tons, 6.1 %
Hull, fittings & equipment: 622 tons, 39.9 %
Fuel, ammunition & stores: 518 tons, 33.2 %
Miscellaneous weights: 320 tons, 20.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 5,726 lbs / 2,597 Kg = 162.1 x 4.1 " / 105 mm shells or 2.1 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 1.7 ft / 0.5 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has raised forecastle, rise forward of midbreak
Block coefficient: 0.457
Length to Beam Ratio: 7.66: 1
'Natural speed' for length: 17.18 kts
Power going to wave formation at top speed: 44 %
Trim (Max stability = 0, Max steadiness = 100): 36
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.97 ft / 7.00 m
- Forecastle (20 %): 20.51 ft / 6.25 m (19.69 ft / 6.00 m aft of break)
- Mid (50 %): 19.69 ft / 6.00 m (11.48 ft / 3.50 m aft of break)
- Quarterdeck (20 %): 11.48 ft / 3.50 m
- Stern: 11.48 ft / 3.50 m
- Average freeboard: 15.94 ft / 4.86 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 45.8 %
- Above water (accommodation/working, high = better): 176.2 %
Waterplane Area: 7,302 Square feet or 678 Square metres
Displacement factor (Displacement / loading): 285 %
Structure weight / hull surface area: 47 lbs/sq ft or 231 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.86
- Longitudinal: 3.56
- 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

Aviation fuel storage simmed as additional bunkers

Radius 8,000 nm on 260 tons of fuel; Aviation fuel stores - 150 tons aviation gasoline, 82 tons diesel

Breakdown of miscellaneous weight

100 tons reserved for two aircraft handling cranes and deck gear
100 tons reserved for service workshops
80 tons reserved for spare aircrew accommodation
40 tons reserved for dry stores and spares

6

Wednesday, June 8th 2011, 8:44pm

Something akin to the Barnegat-class?

7

Wednesday, June 8th 2011, 9:04pm

Of a sort - my inspiration was the OTL French Sans Souci class of small seaplane tenders, though the KM did construct a couple of AVPs - the Richthofen class - that featured a real big boat crane right aft - designed to service flying boats.

Here is a link to the Richthofen design.

I am not certain that they will be built, but I wanted to float the design for review.

This post has been edited 1 times, last edit by "BruceDuncan" (Jun 8th 2011, 9:06pm)


8

Thursday, June 9th 2011, 2:46am

Float the Floatplane tender design, punny Bruce, very punny. :D

9

Thursday, June 9th 2011, 2:48am

Quoted

Originally posted by Sachmle
Float the Floatplane tender design, punny Bruce, very punny. :D

A good pun is it's own reword!

10

Wednesday, July 13th 2011, 12:41am

Transport A - Mercantile Conversion

German Amphibious Transport laid down 1938, converted 1941

Displacement: 8,729 t light; 9,095 t standard; 17,610 t normal; 24,423 t full load

Dimensions: Length overall / water x beam x draught

502.66 ft / 488.85 ft x 61.35 ft x 28.54 ft (normal load) [153.21 m / 149.00 m x 18.70 m x 8.70 m]

Armament:

2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1938 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 85 lbs / 39 kg
Shells per gun, main battery: 250

Armour:

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

Machinery:

Diesel Internal combustion motors, Geared drive, 1 shaft, 9,666 shp / 7,211 Kw = 16.00 kts
Range 62,000nm at 14.00 kts
Bunker at max displacement = 15,328 tons

Complement: 763 - 993

Cost: £1.981 million / $7.925 million

Distribution of weights at normal displacement:

Armament: 11 tons, 0.1 %
Armour: 6 tons, 0.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 265 tons, 1.5 %
Hull, fittings & equipment: 3,947 tons, 22.4 %
Fuel, ammunition & stores: 8,881 tons, 50.4 %
Miscellaneous weights: 4,500 tons, 25.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 55,148 lbs / 25,014 Kg = 1,561.3 x 4.1 " / 105 mm shells or 6.3 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 3.1 ft / 1.0 m
Roll period: 14.6 seconds
Steadiness - As gun platform (Average = 50 %): 54 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has raised forecastle
Block coefficient: 0.720
Length to Beam Ratio: 7.97: 1
'Natural speed' for length: 22.11 kts
Power going to wave formation at top speed: 35 %
Trim (Max stability = 0, Max steadiness = 100): 27
Bow angle (Positive = bow angles forward): 19.65 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 29.49 ft / 8.99 m
- Forecastle (20 %): 27.85 ft / 8.49 m (24.57 ft / 7.49 m aft of break)
- Mid (50 %): 26.21 ft / 7.99 m
- Quarterdeck (20 %): 26.21 ft / 7.99 m
- Stern: 27.85 ft / 8.49 m
- Average freeboard: 26.59 ft / 8.11 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 34.6 %
- Above water (accommodation/working, high = better): 157.0 %
Waterplane Area: 24,373 Square feet or 2,264 Square metres
Displacement factor (Displacement / loading): 344 %
Structure weight / hull surface area: 85 lbs/sq ft or 417 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 3.18
- 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
High stowed cargo and deck equipment simmed as miscellaneous weight
Low stowed cargo simmed as additional bunkers

Bunkers for normal range of 18,000 nm = 2,535 tons; total low-stowed cargo 5,000 tons

Breakdown of miscellaneous weight:

Two Pionier Landungsboot 40 (@62 tons) plus handling gear - 180 tons
Twelve Sturm Landungsboot 40 (@20 tons) plus handling gear - 420 tons
Troop accommodation for 64 officers and 1136 other ranks - 2,500 tons
Recreational and training spaces for landing force - 300 tons
Heavy lift cargo gear - 300 tons
Boat maintenance shop - 300 tons
Enhanced command and control facilities - 250 tons
Provision for additional deck cargo - 250 tons

Cost to acquire and refit - 2,182 tons. Time for conversion - 125 days.
Landing craft must be acquired separately

HoOmAn

Keeper of the Sacred Block Coefficient

  • Send private message

11

Wednesday, July 13th 2011, 6:17pm

Drawings?

Do you have drawings for these ships?

Thanks,

HoOmAn

12

Wednesday, July 13th 2011, 7:21pm

Yes. Drawings would be fine.

13

Wednesday, July 13th 2011, 8:33pm

I have a drawing of the original merchantman, but I think that is not what you are seeking. Alas, I do not have a drawing of her fitted out as a tranport, at least at the present time.

Ship drawings are not my strongest suit.

14

Wednesday, July 13th 2011, 11:32pm

Your drawings are good !!!

15

Wednesday, July 13th 2011, 11:35pm

Quoted

Originally posted by parador
Your drawings are good !!!



Yes, but they do take time. What you have seen is material I have collected over many months.

16

Friday, July 15th 2011, 3:33am

Drawings

I must thank ALVAMA for allowing me to use his drawing of the Hansa Line freighter Goldenfels, which is the ship upon which the Transport A design is based. As a merchantmen, she appears thus:



I must also apologize in advance to him for the kit-bashing I performed to generate a rather quick, preliminary drawing of the proposed Transport A. It is for general configuration only, and not necessarily exact to the Springsharp. I fear I am really not that good.


17

Thursday, August 4th 2011, 8:04pm

Fleet Repair and Support Ship

Tender A, German Fleet Repair and Support Ship laid down 1942

Displacement: 7,608 t light; 7,862 t standard; 11,684 t normal; 14,742 t full load

Dimensions: Length overall / water x beam x draught

519.72 ft / 506.89 ft x 67.26 ft x 20.51 ft (normal load) [158.41 m / 154.50 m x 20.50 m x 6.25 m]

Armament:

4 - 4.13" / 105 mm guns (2x2 guns), 35.32lbs / 16.02kg shells, 1941 Model Anti-aircraft guns in deck mounts with hoists on centreline ends, evenly spread
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1938 Model Anti-aircraft guns in deck mount on centreline forward, all raised guns
6 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 146 lbs / 66 kg
Shells per gun, main battery: 240

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm 0.98" / 25 mm
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

Machinery: Diesel Internal combustion motors, Geared drive, 2 shafts, 16,759 shp / 12,502 Kw = 20.00 kts
Range 31,000nm at 15.00 kts
Bunker at max displacement = 6,880 tons

Complement: 561 - 730

Cost: £2.182 million / $8.728 million

Distribution of weights at normal displacement:

Armament: 18 tons, 0.2 %
Armour: 9 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 9 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 438 tons, 3.7 %
Hull, fittings & equipment: 3,344 tons, 28.6 %
Fuel, ammunition & stores: 4,076 tons, 34.9 %
Miscellaneous weights: 3,800 tons, 32.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 31,357 lbs / 14,224 Kg = 887.8 x 4.1 " / 105 mm shells or 4.0 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 3.9 ft / 1.2 m
Roll period: 14.4 seconds
Steadiness - As gun platform (Average = 50 %): 62 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has rise forward of midbreak
Block coefficient: 0.585
Length to Beam Ratio: 7.54: 1
'Natural speed' for length: 22.51 kts
Power going to wave formation at top speed: 41 %
Trim (Max stability = 0, Max steadiness = 100): 31
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.25 ft / 8.00 m
- Forecastle (20 %): 26.25 ft / 8.00 m
- Mid (50 %): 26.25 ft / 8.00 m (18.04 ft / 5.50 m aft of break)
- Quarterdeck (40 %): 18.04 ft / 5.50 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 22.15 ft / 6.75 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 49.9 %
- Above water (accommodation/working, high = better): 202.0 %
Waterplane Area: 24,587 Square feet or 2,284 Square metres
Displacement factor (Displacement / loading): 242 %
Structure weight / hull surface area: 88 lbs/sq ft or 432 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.72
- 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

Bunkers include fuel storage for other vessels.
Range = 12,000 nm on 2,728 tons; remainder, 4,000 tons, represents fuel oil carried for transfer.

Breakdown of Miscellaneous Weight

Cranes and heavy handling equipment - 540 tons
Accommodation for repair personnel - 800 tons
Engine repair shop - including tools and equipment - 720 tons
Hull repair shop - including tools and equipment - 720 tons
Ordnance repair shop - including tools and equipment - 720 tons
Boat repair shop - including tools and equipment - 300 tons

18

Sunday, August 7th 2011, 12:12am

Ex-mercantile Fleet Repair and Support Ship

Proposed as an alternative to the purpose designed Tender A.

...........


Tender B German Fleet Repair and Support Ship laid down 1942

Displacement: 6,238 t light; 6,472 t standard; 11,003 t normal; 14,627 t full load

Dimensions: Length overall / water x beam x draught

423.30 ft / 406.82 ft x 56.76 ft x 23.62 ft (normal load) [129.02 m / 124.00 m x 17.30 m x 7.20 m]

Armament:

2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1940 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, 1 raised mount
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, all amidships
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 78 lbs / 35 kg
Shells per gun, main battery: 300

Armour:

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

Machinery: Diesel Internal combustion motors, Geared drive, 1 shaft, 4,665 shp / 3,480 Kw = 14.00 kts
Range 64,800nm at 12.00 kts
Bunker at max displacement = 8,155 tons

Complement: 536 - 698

Cost: £1.550 million / $6.200 million

Distribution of weights at normal displacement:

Armament: 10 tons, 0.1 %
Armour: 5 tons, 0.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 122 tons, 1.1 %
Hull, fittings & equipment: 2,302 tons, 20.9 %
Fuel, ammunition & stores: 4,764 tons, 43.3 %
Miscellaneous weights: 3,800 tons, 34.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 25,255 lbs / 11,455 Kg = 715.0 x 4.1 " / 105 mm shells or 3.9 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 2.5 ft / 0.8 m
Roll period: 14.9 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has raised forecastle, rise forward of midbreak
Block coefficient: 0.706
Length to Beam Ratio: 7.17: 1
'Natural speed' for length: 20.17 kts
Power going to wave formation at top speed: 33 %
Trim (Max stability = 0, Max steadiness = 100): 29
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.23 ft / 8.30 m
- Forecastle (20 %): 26.25 ft / 8.00 m (25.26 ft / 7.70 m aft of break)
- Mid (50 %): 17.06 ft / 5.20 m (16.40 ft / 5.00 m aft of break)
- Quarterdeck (15 %): 16.40 ft / 5.00 m
- Stern: 17.06 ft / 5.20 m
- Average freeboard: 19.93 ft / 6.07 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 43.1 %
- Above water (accommodation/working, high = better): 122.3 %
Waterplane Area: 18,498 Square feet or 1,719 Square metres
Displacement factor (Displacement / loading): 267 %
Structure weight / hull surface area: 76 lbs/sq ft or 369 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.14
- Overall: 1.00
Hull space for machinery, storage, and compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Bunkers include fuel storage for other vessels.
Range = 12,000 nm on 1,591 tons; remainder, 6,000 tons, represents fuel oil carried for transfer.


Breakdown of Miscellaneous Weight

Cranes and heavy handling equipment - 500 tons
Accommodation for repair personnel - 800 tons
Engine repair shop - including tools and equipment - 700 tons
Hull repair shop - including tools and equipment - 700 tons
Ordnance repair shop - including tools and equipment - 700 tons
Boat repair shop - including tools and equipment - 400 tons

Cost to acquire and convert @25% - 1,560 tons; time to convert - 118 days

19

Sunday, August 7th 2011, 12:47pm

The cheaper conversion might be better value for money. It's not vastly inferior and from the misc weight calcs seems to carry most of the same equipment fit.

20

Sunday, August 7th 2011, 12:53pm

Upon reflection, I am in complete agreement with you; the mercantile conversion is far more cost effective.

But I have this cool-looking drawing for Tender A which now goes back into the drawer. Oh well. :(