First project for the Indochinese Navy : a small patrol ship, for harbours and rivers. It's inspired by a NUS ship, but it's bigger and more protected than the NUS ship.
QuoteGia-Long, Independent Indochina Patrol Ship laid down 1919 (Engine 1916)
Displacement:
42 t light; 43 t standard; 55 t normal; 64 t full load
Dimensions: Length overall / water x beam x draught
98,43 ft / 98,43 ft x 11,48 ft x 3,94 ft (normal load)
30,00 m / 30,00 m x 3,50 m x 1,20 m
Armament:
1 - 2,24" / 57,0 mm guns in single mounts, 5,65lbs / 2,56kg shells, 1911 Model
Quick firing gun in deck mount
on centreline forward
2 - 0,50" / 12,7 mm guns in single mounts, 0,06lbs / 0,03kg shells, 1911 Model
Machine guns in deck mounts
on centreline, evenly spread
Weight of broadside 6 lbs / 3 kg
Shells per gun, main battery: 200
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,59" / 15 mm - -
2nd: 0,59" / 15 mm - -
- Armour deck: 0,20" / 5 mm
Machinery:
Petrol Internal combustion motors,
Geared drive, 2 shafts, 329 shp / 246 Kw = 15,00 kts
Range 2 300nm at 12,00 kts
Bunker at max displacement = 21 tons
Complement:
9 - 13
Cost:
£0,008 million / $0,033 million
Distribution of weights at normal displacement:
Armament: 1 tons, 1,3 %
Armour: 3 tons, 6,0 %
- Belts: 0 tons, 0,0 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 1 tons, 1,3 %
- Armour Deck: 3 tons, 4,7 %
- Conning Tower: 0 tons, 0,0 %
Machinery: 12 tons, 22,3 %
Hull, fittings & equipment: 20 tons, 37,1 %
Fuel, ammunition & stores: 13 tons, 24,2 %
Miscellaneous weights: 5 tons, 9,1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
71 lbs / 32 Kg = 12,6 x 2,2 " / 57 mm shells or 0,2 torpedoes
Stability (Unstable if below 1.00): 1,05
Metacentric height 0,2 ft / 0,1 m
Roll period: 10,4 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0,31
Seaboat quality (Average = 1.00): 2,00
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,433
Length to Beam Ratio: 8,57 : 1
'Natural speed' for length: 9,92 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 10,93 ft / 3,33 m
- Forecastle (10 %): 6,96 ft / 2,12 m
- Mid (50 %): 6,96 ft / 2,12 m
- Quarterdeck (15 %): 6,96 ft / 2,12 m
- Stern: 6,96 ft / 2,12 m
- Average freeboard: 7,11 ft / 2,17 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 93,1 %
- Above water (accommodation/working, high = better): 104,7 %
Waterplane Area: 711 Square feet or 66 Square metres
Displacement factor (Displacement / loading): 143 %
Structure weight / hull surface area: 10 lbs/sq ft or 50 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,49
- Longitudinal: 9,40
- Overall: 0,66
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is adequate
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
The X-sectional strength is below the one under destroyer rules - but the boat is too slow to build under such.
Should I increase the cross-sectionnal hull strenght ?
Quote from: ciders on July 23, 2010, 02:04:41 PM
Should I increase the cross-sectionnal hull strenght ?
I would, but I'd do it by lowering freeboard. With a 2.00 seakeeping you can afford it. Shouldn't take much, maybe 2.10 instead of 2.12 across the ship, or drop the quarterdeck then you can drop mines (granted only 5) or depth charges. (Multi purpose is good, no?)
You still need 1.00 overall strength. The range is too high, bunkerage taking 50% of full displacement. The ships is kinda slow and somewhat weakly armed to act as a subchaser.
Quote from: P3D on July 23, 2010, 02:41:18 PM
You still need 1.00 overall strength. The range is too high, bunkerage taking 50% of full displacement. The ships is kinda slow and somewhat weakly armed to act as a subchaser.
LOL...I never even looked at the overall.
It's not an coastal patrol ship, but more a riverine patrol ship, in fact. It will have to patrol in the neighborhood of Saigon and on the Mekong, not hunt RRC subs.
Reduce the freeboard to increase stability - 1.10
Overall = 1.00
Jef ;)
Pas facile de faire une miniature de 42t ... ;)
( Not easy to SS a 42t miniature... ;) )
Jef ;)
( Dis tout de suite que mon Gia-Long est une barcasse rouillée armée par une bande d'Anglais rescapés de l'inauguration de la goelette de Bill ). ;D
Second prototype :
QuoteGia-Long, Independent Indochina Patrol Ship laid down 1919 (Engine 1916)
Displacement:
60 t light; 62 t standard; 66 t normal; 70 t full load
Dimensions: Length overall / water x beam x draught
114,83 ft / 114,83 ft x 11,81 ft x 3,94 ft (normal load)
35,00 m / 35,00 m x 3,60 m x 1,20 m
Armament:
1 - 2,24" / 57,0 mm guns in single mounts, 5,65lbs / 2,56kg shells, 1911 Model
Quick firing gun in deck mount
on centreline forward
2 - 0,50" / 12,7 mm guns in single mounts, 0,06lbs / 0,03kg shells, 1911 Model
Machine guns in deck mounts
on centreline, evenly spread
Weight of broadside 6 lbs / 3 kg
Shells per gun, main battery: 200
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,59" / 15 mm - -
2nd: 0,59" / 15 mm - -
- Armour deck: 0,20" / 5 mm
Machinery:
Petrol Internal combustion motors,
Geared drive, 2 shafts, 339 shp / 253 Kw = 15,00 kts
Range 800nm at 12,00 kts
Bunker at max displacement = 8 tons
Complement:
11 - 15
Cost:
£0,010 million / $0,039 million
Distribution of weights at normal displacement:
Armament: 1 tons, 1,1 %
Armour: 4 tons, 5,8 %
- Belts: 0 tons, 0,0 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 1 tons, 1,1 %
- Armour Deck: 3 tons, 4,7 %
- Conning Tower: 0 tons, 0,0 %
Machinery: 13 tons, 19,1 %
Hull, fittings & equipment: 37 tons, 56,6 %
Fuel, ammunition & stores: 6 tons, 9,8 %
Miscellaneous weights: 5 tons, 7,6 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
148 lbs / 67 Kg = 26,3 x 2,2 " / 57 mm shells or 0,3 torpedoes
Stability (Unstable if below 1.00): 1,01
Metacentric height 0,2 ft / 0,1 m
Roll period: 10,9 seconds
Steadiness - As gun platform (Average = 50 %): 66 %
- Recoil effect (Restricted arc if above 1.00): 0,21
Seaboat quality (Average = 1.00): 2,00
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,433
Length to Beam Ratio: 9,72 : 1
'Natural speed' for length: 10,72 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 33
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 10,93 ft / 3,33 m
- Forecastle (15 %): 6,96 ft / 2,12 m
- Mid (50 %): 6,96 ft / 2,12 m
- Quarterdeck (15 %): 6,96 ft / 2,12 m
- Stern: 6,96 ft / 2,12 m
- Average freeboard: 7,19 ft / 2,19 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 79,7 %
- Above water (accommodation/working, high = better): 102,8 %
Waterplane Area: 854 Square feet or 79 Square metres
Displacement factor (Displacement / loading): 166 %
Structure weight / hull surface area: 16 lbs/sq ft or 78 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,77
- Longitudinal: 10,50
- 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
Quote...Stability (Unstable if below 1.00): 1,01
...
- Increase beam
- Reduce freeboard
- Increase stability to 1.08 - 1.10
Jef
QuoteGia-Long, Independent Indochina Patrol Ship laid down 1919 (Engine 1916)
Displacement:
66 t light; 69 t standard; 73 t normal; 77 t full load
Dimensions: Length overall / water x beam x draught
114,83 ft / 114,83 ft x 13,12 ft x 3,94 ft (normal load)
35,00 m / 35,00 m x 4,00 m x 1,20 m
Armament:
1 - 2,24" / 57,0 mm guns in single mounts, 5,65lbs / 2,56kg shells, 1911 Model
Quick firing gun in deck mount
on centreline forward
2 - 0,50" / 12,7 mm guns in single mounts, 0,06lbs / 0,03kg shells, 1911 Model
Machine guns in deck mounts
on centreline, evenly spread
Weight of broadside 6 lbs / 3 kg
Shells per gun, main battery: 200
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,59" / 15 mm - -
2nd: 0,59" / 15 mm - -
- Armour deck: 0,20" / 5 mm
Machinery:
Petrol Internal combustion motors,
Geared drive, 2 shafts, 367 shp / 274 Kw = 15,00 kts
Range 800nm at 12,00 kts
Bunker at max displacement = 9 tons
Complement:
12 - 16
Cost:
£0,011 million / $0,042 million
Distribution of weights at normal displacement:
Armament: 1 tons, 1,0 %
Armour: 4 tons, 5,7 %
- Belts: 0 tons, 0,0 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 1 tons, 1,0 %
- Armour Deck: 3 tons, 4,7 %
- Conning Tower: 0 tons, 0,0 %
Machinery: 14 tons, 18,6 %
Hull, fittings & equipment: 43 tons, 58,4 %
Fuel, ammunition & stores: 7 tons, 9,5 %
Miscellaneous weights: 5 tons, 6,8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
171 lbs / 78 Kg = 30,3 x 2,2 " / 57 mm shells or 0,3 torpedoes
Stability (Unstable if below 1.00): 1,08
Metacentric height 0,3 ft / 0,1 m
Roll period: 10,5 seconds
Steadiness - As gun platform (Average = 50 %): 66 %
- Recoil effect (Restricted arc if above 1.00): 0,13
Seaboat quality (Average = 1.00): 2,00
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,433
Length to Beam Ratio: 8,75 : 1
'Natural speed' for length: 10,72 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 33
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11,78 ft / 3,59 m
- Forecastle (10 %): 6,56 ft / 2,00 m
- Mid (40 %): 6,56 ft / 2,00 m
- Quarterdeck (10 %): 6,56 ft / 2,00 m
- Stern: 6,56 ft / 2,00 m
- Average freeboard: 6,77 ft / 2,06 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 76,5 %
- Above water (accommodation/working, high = better): 98,8 %
Waterplane Area: 948 Square feet or 88 Square metres
Displacement factor (Displacement / loading): 174 %
Structure weight / hull surface area: 20 lbs/sq ft or 98 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,94
- Longitudinal: 7,73
- Overall: 1,16
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