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1

Saturday, November 18th 2006, 1:47pm

New DD for Germany, 1933

Here's a new DD (though she counts as a CL under the Treaty) for the Kriegsmarine. Apparently France and Germany are thinking along similar, though not identical, lines right now.....


(Picture by Wes, with minor turret modifications to look more like the fore turret on Z-31 by me)


KM Lebrecht Maas, German Heavy Destroyer laid down 1933

Displacement:
2,852 t light; 2,979 t standard; 3,288 t normal; 3,536 t full load

Dimensions: Length overall / water x beam x draught
483.15 ft / 465.88 ft x 44.29 ft x 13.94 ft (normal load)
147.26 m / 142.00 m x 13.50 m x 4.25 m

Armament:
6 - 5.91" / 150 mm guns (3x2 guns), 100.31lbs / 45.50kg shells, 1933 Model
Breech loading guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
4 - 3.46" / 88.0 mm guns (2x2 guns), 20.79lbs / 9.43kg shells, 1933 Model
Dual purpose guns in deck mounts
on centreline, all aft, all raised mounts - superfiring
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1933 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 699 lbs / 317 kg
Shells per gun, main battery: 150
8 - 23.6" / 600 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.76" / 70 mm 1.57" / 40 mm 2.76" / 70 mm
2nd: 1.18" / 30 mm 0.79" / 20 mm -
3rd: 0.79" / 20 mm 0.79" / 20 mm -
4th: 0.39" / 10 mm 0.39" / 10 mm -

- Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 57,418 shp / 42,834 Kw = 35.50 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 557 tons

Complement:
216 - 282

Cost:
£1.846 million / $7.384 million

Distribution of weights at normal displacement:
Armament: 89 tons, 2.7 %
Armour: 80 tons, 2.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 67 tons, 2.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 13 tons, 0.4 %
Machinery: 1,540 tons, 46.8 %
Hull, fittings & equipment: 1,093 tons, 33.2 %
Fuel, ammunition & stores: 436 tons, 13.3 %
Miscellaneous weights: 50 tons, 1.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,018 lbs / 462 Kg = 9.9 x 5.9 " / 150 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.24
Metacentric height 2.2 ft / 0.7 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.57
Seaboat quality (Average = 1.00): 1.20

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 10.52 : 1
'Natural speed' for length: 24.86 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.07 ft / 8.25 m
- Forecastle (20 %): 22.15 ft / 6.75 m
- Mid (40 %): 22.15 ft / 6.75 m (15.58 ft / 4.75 m aft of break)
- Quarterdeck (15 %): 15.58 ft / 4.75 m
- Stern: 15.58 ft / 4.75 m
- Average freeboard: 18.60 ft / 5.67 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 173.7 %
- Above water (accommodation/working, high = better): 135.5 %
Waterplane Area: 13,182 Square feet or 1,225 Square metres
Displacement factor (Displacement / loading): 78 %
Structure weight / hull surface area: 45 lbs/sq ft or 220 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.55
- Overall: 0.56
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

10 tons reserved for depth charges and rails

40 tons reserved for mines and growth

2

Saturday, November 18th 2006, 1:56pm

Big, fast, and long-legged, I like.

The twin 6" turrets seem a little small, although I'm not sure what Wes's scale is.

What's the intended role? Destroyer leader?

3

Saturday, November 18th 2006, 2:45pm

Intended role is as either destroyer leaders or simply large fleet destroyers.

4

Saturday, November 18th 2006, 9:52pm

Scale is similar to Hoomans, my own 6" turrets seem large by compairison.

Give me some specs on the turret size and I'll size em up properly on my template to see if its accurate.

5

Saturday, November 18th 2006, 10:04pm



Comparison with 152mm turrets from a smaller scale. I'm working at 1:45 and you and Stephan are around 1:35 - 1:40 so should have larger turrets.

6

Saturday, November 18th 2006, 11:19pm

Funny, when I went into my German weapons template I found the turret was small when compared to its triple counterpart, not sure how that happened. He she is with larger turrets...


7

Saturday, November 18th 2006, 11:35pm

Are those the twin 15cm from the capital ships, or the twin 15cm from the Zerstorers?

Reason I ask is that the turrets should look like the bow turret here:

8

Saturday, November 18th 2006, 11:40pm

I like the bigger turrets, methinks she looks more balanced now.

9

Saturday, November 18th 2006, 11:58pm

They are basically twin versions of the 15cm turrets from the Ankara class, though obviously with less armor.

Given my own German DD models dipict turrets very similar in appearance to those on the capital ships they might look appropriate.

HoOmAn

Keeper of the Sacred Block Coefficient

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10

Sunday, November 19th 2006, 2:31am

Beam seems too wide on the pic - she has a length:beam ratio above 10 after all.

11

Sunday, November 19th 2006, 2:35am

Don't know how seeing as its been done to scale.

12

Sunday, November 19th 2006, 11:43am

I'm inclined to see Lebrecht Maas less as a destroyer than an unarmoured fast cruiser.

I agree she looks fatter than a DD should, perhaps its that and the powerful turrets that makes me think more of a cruiser than a destroyer.

13

Sunday, November 19th 2006, 4:34pm

Well , what turned out the be the German scout cruiser was originally proposed in 1938 as "Destroyer 1938 ac" or "ad" (and was actually larger than this design) and later (1939) grew into a Reconassiance Cruiser.
So based on historical precedent I guess this could be considered a destroyer