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Herstal Class, Belgium Minesweeper laid down 1947
Displacement:
150 t light; 154 t standard; 163 t normal; 171 t full load
Dimensions: Length overall / water x beam x draught
117.49 ft / 113.19 ft x 21.98 ft x 6.89 ft (normal load)
35.81 m / 34.50 m x 6.70 m x 2.10 m
Armament:
2 - 0.91" / 23.0 mm guns (1x2 guns), 0.44lbs / 0.20kg shells, 1941 Model
Anti-aircraft guns in deck mount
on centreline forward
2 - 0.52" / 13.2 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1928 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 1 lbs / 0 kg
Shells per gun, main battery: 850
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 620 shp / 462 Kw = 15.03 kts
Range 2,300nm at 10.00 kts
Bunker at max displacement = 17 tons
Complement:
22 - 29
Cost:
£0.054 million / $0.218 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.1 %
Armour: 1 tons, 0.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 15 tons, 9.4 %
Hull, fittings & equipment: 69 tons, 42.2 %
Fuel, ammunition & stores: 13 tons, 8.1 %
Miscellaneous weights: 65 tons, 39.9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
363 lbs / 165 Kg = 978.9 x 0.9 " / 23 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.93
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.333
Length to Beam Ratio: 5.15 : 1
'Natural speed' for length: 10.64 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 26
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11.81 ft / 3.60 m
- Forecastle (20 %): 9.84 ft / 3.00 m
- Mid (65 %): 8.20 ft / 2.50 m
- Quarterdeck (15 %): 7.38 ft / 2.25 m
- Stern: 7.22 ft / 2.20 m
- Average freeboard: 8.84 ft / 2.69 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 75.3 %
- Above water (accommodation/working, high = better): 113.8 %
Waterplane Area: 1,520 Square feet or 141 Square metres
Displacement factor (Displacement / loading): 168 %
Structure weight / hull surface area: 25 lbs/sq ft or 124 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.79
- Longitudinal: 8.61
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Misc Weight
40 tons sweeping gear and handling equipment
5 tons mine detecting ASDIC
5 tons Signaal M1946 surface search RDF set
15 tons growth margin
Quoted
Spa Class, Belgium Escort laid down 1947
Displacement:
1,203 t light; 1,263 t standard; 1,546 t normal; 1,772 t full load
Dimensions: Length overall / water x beam x draught
286.63 ft / 278.87 ft x 34.45 ft x 10.73 ft (normal load)
87.37 m / 85.00 m x 10.50 m x 3.27 m
Armament:
4 - 3.54" / 90.0 mm guns (2x2 guns), 24.25lbs / 11.00kg shells, 1947 Model
Automatic rapid fire 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, 1944 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.91" / 23.0 mm guns (2x2 guns), 0.44lbs / 0.20kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts
Weight of broadside 108 lbs / 49 kg
Shells per gun, main battery: 450
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: 0.59" / 15 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -
- Conning tower: 0.98" / 25 mm
Machinery:
Oil fired boilers, steam turbines,
Electric motors, 2 shafts, 22,500 shp / 16,785 Kw = 27.82 kts
Range 7,500nm at 15.00 kts
Bunker at max displacement = 509 tons
Complement:
123 - 160
Cost:
£0.962 million / $3.848 million
Distribution of weights at normal displacement:
Armament: 15 tons, 1.0 %
Armour: 11 tons, 0.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 8 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.2 %
Machinery: 556 tons, 36.0 %
Hull, fittings & equipment: 437 tons, 28.3 %
Fuel, ammunition & stores: 343 tons, 22.2 %
Miscellaneous weights: 185 tons, 12.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
878 lbs / 398 Kg = 39.5 x 3.5 " / 90 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.30
Metacentric height 1.6 ft / 0.5 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.19
Seaboat quality (Average = 1.00): 1.24
Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.525
Length to Beam Ratio: 8.10 : 1
'Natural speed' for length: 16.70 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.33 ft / 6.50 m
- Forecastle (20 %): 18.70 ft / 5.70 m
- Mid (50 %): 17.22 ft / 5.25 m
- Quarterdeck (15 %): 9.84 ft / 3.00 m (17.22 ft / 5.25 m before break)
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 16.84 ft / 5.13 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 138.1 %
- Above water (accommodation/working, high = better): 178.2 %
Waterplane Area: 6,550 Square feet or 608 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 32 lbs/sq ft or 157 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 3.74
- Overall: 0.61
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily
Misc Weight
5 tons for Signaal M1946 surface search RDF set
20 tons for two ASDIC sets
22 tons for Hedgehog and ammunition
20 tons for 2x DC racks and 2x DCT for 36x DCs
8 tons for Hazemeyer IV mounts
8 tons for automatic 90mm mounts
50 tons for improved habitability
50 tons for growth
Is economy really what Belgium is looking for, though? It'd seem to me that with 5.5 factories, Belgium is "over-saturated" with naval tonnage for its reasonable needs, and so an "economical" solution like the Roon ought to be avoided.
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If you want it to be a proper Belgian sponge, you should build it out of concrete and not install engines.
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I'd probably have set up three twin dual-purpose guns (125mm?) rather than two twin 152mm guns, but that's just my preference.
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