WesWorld

Räumboote Typ 1941

The Kriegsmarine is considering designs for several types of small craft that may be ordered some time in 1941.



Tonnage – 150 tons (166 tons full load)
Dimensions – Length 41.1 metres; Beam 5.80 metres; Draft 1.60 metres
Machinery – Two shafts, Maschinenfabrik Augsburg-Nurnberg diesel motors, BHP 1,800 = 19 knots. Bunker capacity 11 tons, radius 1,000 nm at 15 knots
Armament –One single 20mm FlaK38 forward of the cockpit, one single 20mm FlaK38 amidships, one 37mm FlaK38 aft
Crew – 38

Characteristics:

Tonnage: 25
Dimensions: 19.20 (pp) x 5.33 x 1.14 metres
Engines: Three shafts, three Daimler Benz marine diesels, 1,500 hp
Speed: 30 knots
Armament: None
Crew: 9


To meet current requirements the Naval Staff, on behalf of the Marineflieger, has proposed a design for a motor rescue launch for use by the Seenotdienst (Sea Rescue Service). This class of vessel would be operated from coastal seaplane and other stations to rescue airmen downed at sea by accident or other incident.

Nice little design.

Thanks!

Can't quite recall where I located the drawing of the boat; the dimensions are derived from those of the RAF's 63-footer.

Pionier Motor Launch Typ 1941

The Kriegsmarine is considering designs for several types of small craft that may be ordered some time in 1941.



Tonnage – 82 tons (130 tons full load)
Dimensions – Length 34.15 metres (oa); Beam 5.55 metres; Draft 2.30 metres.
Machinery – Two shafts, Maschinenfabrik Augsburg-Nurnberg diesel motors, BHP 1,200 = 19 knots. Bunker capacity 11 tons, radius 1,200 nm at 12 knots
Armament – One single 20mm Flak38 on the foredeck, one single 20mm Flak38 aft.
Crew – 16

Hum, interesting looking design. What's it intended to do?

It's suitable for a variety of roles - l expect in KM service it would be employed for harbor patrol. Two of them are intended to be carried aboard the new Coronel class advanced base ships, so they might find themselves running ship-to-shore dispatch boat missions, light towing around an unimproved harbour, or perhaps even coastal survey. Over a short trip they could probably carry some additional personnel and stores for an outpost.

I rather see them as maids of all work.

Interesting idea; sounds like they could be useful sorts.

Are the funnels necessary on this sort of small diesel-powered craft? I'd have thought not...

I doubt that funnels in the traditional sense would be required. However, the historical exemplar I chose was built that way, so I stayed with it. I does make for a neat profile I think.

The Deutsche Schiff und Maschinenbau Aktiengesellschaft of Bremen has proposed the following design to meet the potential needs of foreign customers for an affordable yet modern destroyer of modest dimensions.



Deschimag Export Destroyer, German - Export Account Destroyer laid down 1941

Displacement: 1,617 t light; 1,700 t standard; 1,925 t normal; 2,104 t full load

Dimensions: Length overall / water x beam x draught

386.73 ft / 374.02 ft x 35.99 ft x 12.20 ft (normal load) [117.88 m / 114.00 m x 10.97 m x 3.72 m]

Armament:

4 - 5.04" / 128 mm guns in single mounts, 63.99lbs / 29.03kg shells, 1940 Model Dual purpose guns in deck mounts with hoists on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, all amidships, all raised mounts - superfiring
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
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, evenly spread, all raised mounts
Weight of broadside 271 lbs / 123 kg
Shells per gun, main battery: 280
10 - 21.0" / 533.4 mm above water torpedoes

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.59" / 15 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -
4th: 0.39" / 10 mm - -

Conning tower: 1.57" / 40 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 33,917 shp / 25,302 Kw = 33.00 kts
Range 5,500nm at 15.00 kts
Bunker at max displacement = 405 tons

Complement: 144 - 188

Cost: £1.254 million / $5.015 million

Distribution of weights at normal displacement:

Armament: 34 tons, 1.8 %
Armour: 20 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 15 tons, 0.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 5 tons, 0.3 %
Machinery: 841 tons, 43.7 %
Hull, fittings & equipment: 672 tons, 34.9 %
Fuel, ammunition & stores: 307 tons, 16.0 %
Miscellaneous weights: 50 tons, 2.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 782 lbs / 355 Kg = 12.2 x 5.0 " / 128 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.5 ft / 0.5 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 74 %
- Recoil effect (Restricted arc if above 1.00): 0.53
Seaboat quality (Average = 1.00): 1.42

Hull form characteristics:

Hull has raised forecastle, rise forward of midbreak and transom stern
Block coefficient: 0.410
Length to Beam Ratio: 10.39: 1
'Natural speed' for length: 22.26 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 52
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: 25.92 ft / 7.90 m
- Forecastle (20 %): 24.61 ft / 7.50 m (23.95 ft / 7.30 m aft of break)
- Mid (45 %): 23.95 ft / 7.30 m (12.14 ft / 3.70 m aft of break)
- Quarterdeck (15 %): 12.14 ft / 3.70 m
- Stern: 12.14 ft / 3.70 m
- Average freeboard: 17.69 ft / 5.39 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 158.8 %
- Above water (accommodation/working, high = better): 93.2 %
Waterplane Area: 8,653 Square feet or 804 Square metres
Displacement factor (Displacement / loading): 90 %
Structure weight / hull surface area: 36 lbs/sq ft or 177 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.84
- Overall: 0.59
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weight

50 tons reserved for electronics and design growth

Nice design, nice drawing.

However, I doubt you will have enough deck space abreast her forward superstructure to place a 2cm quad. A deck plan would reveal that.

Quoted

Originally posted by HoOmAn
Nice design, nice drawing.

However, I doubt you will have enough deck space abreast her forward superstructure to place a 2cm quad. A deck plan would reveal that.

You may be quite correct on that point. It is something to consider. But I cannot take much credit for the drawing, it is but an adaptation of one I found on the German Naval History site.

Well, whoever designed it first - the quad will not fit.

Quoted

Originally posted by HoOmAn
Well, whoever designed it first - the quad will not fit.

The placement of the quad mount is part of my adaptation. And I will consider alternatives.