August von Thomsen, German Naval Store Carrier laid down 1943
Displacement: 1,667 t light; 1,755 t standard; 3,999 t normal; 5,795 t full load
Dimensions: Length overall / water x beam x draught
297.12 ft / 279.69 ft x 44.39 ft x 15.88 ft (normal load) [90.56 m / 85.25 m x 13.53 m x 4.84 m]
Armament:
1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1943 Model Anti-aircraft Gun in deck mount on centerline aft
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1943 Model Anti-aircraft guns in deck mounts on centerline ends, evenly spread, all raised mounts - superfiring
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1943 Model Anti-aircraft guns in deck mounts on side, all amidships, 1 raised mount - superfiring
Weight of broadside 42 lbs / 19 kg
Shells per gun, main battery: 300
Machinery:
Diesel Internal combustion motors, Geared drive, 1 shaft, 826 shp / 616 Kw = 10.00 kts
Range 89,500nm at 10.00 kts
Bunker at max displacement = 4,040 tons
Complement: 250 - 326
Cost: £0.431 million / $1.722 million
Distribution of weights at normal displacement:
Armament: 5 tons, 0.1 %
Machinery: 21 tons, 0.5 %
Hull, fittings & equipment: 1,090 tons, 27.3 %
Fuel, ammunition & stores: 2,332 tons, 58.3 %
Miscellaneous weights: 550 tons, 13.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship): 28,058 lbs / 12,727 Kg = 794.4 x 4.1 " / 105 mm shells or 7.8 torpedoes
Stability (Unstable if below 1.00): 1.26
Metacentric height 2.3 ft / 0.7 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 88 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle, rise forward of midbreak, raised quarterdeck
Block coefficient: 0.710
Length to Beam Ratio: 6.30: 1
'Natural speed' for length: 16.72 kts
Power going to wave formation at top speed: 27 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.29 ft / 7.10 m
- Forecastle (20 %): 22.15 ft / 6.75 m (21.33 ft / 6.50 m aft of break)
- Mid (50 %): 20.51 ft / 6.25 m (19.69 ft / 6.00 m aft of break)
- Quarterdeck (15 %): 20.51 ft / 6.25 m (19.69 ft / 6.00 m before break)
- Stern: 21.33 ft / 6.50 m
- Average freeboard: 20.82 ft / 6.35 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 19.6 %
- Above water (accommodation/working, high = better): 154.1 %
Waterplane Area: 9,987 Square feet or 928 Square meters
Displacement factor (Displacement / loading): 630 %
Structure weight / hull surface area: 57 lbs/sq. ft or 279 Kg/sq. meter
Hull strength (Relative):
- Cross-sectional: 0.85
- Longitudinal: 6.05
- Overall: 1.03
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
Adapted from standard Hansa A-3 cargo vessels - Cost to convert 250 tons; time to convert 49 days
Low-stowed cargo simmed as additional fuel - true bunkers 269 tons for a radius of 10,000 nm; low stowed cargo 1,900 tons
550 tons miscellaneous weight reserved for deck cargo, modifications, etc.
August von Thomsen – Conversion begun 1 January 1950; Conversion complete 19 February 1950
Eduard von Knorr – Conversion begun 1 January 1950; Conversion complete 19 February 1950