WesWorld

Not much to show off, a new destroyer and an icebreaker. The destroyer will be the last for a while and will complete a destroyer sqaudron to full strength and is for fleet operations. The Icebreaker will undertake supply missions to Antarctic scientific bases and coastal patrols and fishery support. In wartime it would be used as an escort vessel.

Project 422 1940 Class, Argentina Destroyer laid down 1940

Displacement:
1,625 t light; 1,719 t standard; 1,970 t normal; 2,171 t full load

Dimensions: Length overall / water x beam x draught
390.63 ft / 383.86 ft x 35.43 ft x 12.30 ft (normal load)
119.06 m / 117.00 m x 10.80 m x 3.75 m

Armament:
6 - 4.53" / 115 mm guns (3x2 guns), 55.00lbs / 24.95kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 2 raised mounts - superfiring
6 - 1.46" / 37.0 mm guns (3x2 guns), 1.55lbs / 0.70kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
12 - 0.79" / 20.0 mm guns (6x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
Weight of broadside 342 lbs / 155 kg
Shells per gun, main battery: 275
8 - 23.6" / 600 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm 0.79" / 20 mm
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

- Conning tower: 0.98" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 35,000 shp / 26,110 Kw = 33.23 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 452 tons

Complement:
147 - 192

Cost:
£1.246 million / $4.983 million

Distribution of weights at normal displacement:
Armament: 36 tons, 1.8 %
Armour: 18 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 15 tons, 0.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.2 %
Machinery: 859 tons, 43.6 %
Hull, fittings & equipment: 622 tons, 31.6 %
Fuel, ammunition & stores: 344 tons, 17.5 %
Miscellaneous weights: 90 tons, 4.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
699 lbs / 317 Kg = 15.1 x 4.5 " / 115 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.32
Metacentric height 1.7 ft / 0.5 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.50
Seaboat quality (Average = 1.00): 1.14

Hull form characteristics:
Hull has raised forecastle, rise forward of midbreak
and transom stern
Block coefficient: 0.412
Length to Beam Ratio: 10.83 : 1
'Natural speed' for length: 22.47 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 43
Bow angle (Positive = bow angles forward): 17.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.15 ft / 6.75 m
- Forecastle (20 %): 21.33 ft / 6.50 m (19.69 ft / 6.00 m aft of break)
- Mid (43 %): 21.33 ft / 6.50 m (11.48 ft / 3.50 m aft of break)
- Quarterdeck (15 %): 11.48 ft / 3.50 m
- Stern: 11.48 ft / 3.50 m
- Average freeboard: 15.59 ft / 4.75 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 161.6 %
- Above water (accommodation/working, high = better): 81.1 %
Waterplane Area: 8,754 Square feet or 813 Square metres
Displacement factor (Displacement / loading): 87 %
Structure weight / hull surface area: 36 lbs/sq ft or 178 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.77
- Overall: 0.56
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

Class Names: Rivadavia

Misc Weight: Includes eight 600mm torpedoes, 4 DCT and two racks (40 DC) and Langhiri-Florisson ASDIC and one search/ gunnery radio-location set



Project 706D Piedra Buena, Argentina Patrol Icebreaker laid down 1940

Displacement:
4,731 t light; 4,856 t standard; 5,878 t normal; 6,695 t full load

Dimensions: Length overall / water x beam x draught
359.76 ft / 357.61 ft x 65.62 ft x 20.34 ft (normal load)
109.66 m / 109.00 m x 20.00 m x 6.20 m

Armament:
2 - 3.94" / 100 mm guns (1x2 guns), 30.42lbs / 13.80kg shells, 1933 Model
Quick firing guns in deck mount
on centreline forward
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
2 - 0.30" / 7.6 mm guns in single mounts, 0.01lbs / 0.01kg shells, 1940 Model
Machine guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 67 lbs / 30 kg
Shells per gun, main battery: 175

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.97" / 50 mm 214.57 ft / 65.40 m 22.97 ft / 7.00 m
Ends: 1.97" / 50 mm 143.04 ft / 43.60 m 22.97 ft / 7.00 m
Main Belt covers 92 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 8,000 shp / 5,968 Kw = 18.08 kts
Range 12,000nm at 15.00 kts
Bunker at max displacement = 1,839 tons

Complement:
335 - 436

Cost:
£1.216 million / $4.863 million

Distribution of weights at normal displacement:
Armament: 8 tons, 0.1 %
Armour: 675 tons, 11.5 %
- Belts: 672 tons, 11.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 214 tons, 3.6 %
Hull, fittings & equipment: 2,109 tons, 35.9 %
Fuel, ammunition & stores: 1,146 tons, 19.5 %
Miscellaneous weights: 1,725 tons, 29.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
15,161 lbs / 6,877 Kg = 496.9 x 3.9 " / 100 mm shells or 3.5 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 3.5 ft / 1.1 m
Roll period: 14.8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.431
Length to Beam Ratio: 5.45 : 1
'Natural speed' for length: 18.91 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (22 %): 22.97 ft / 7.00 m
- Mid (45 %): 22.97 ft / 7.00 m (13.12 ft / 4.00 m aft of break)
- Quarterdeck (18 %): 13.12 ft / 4.00 m
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 17.70 ft / 5.39 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 46.1 %
- Above water (accommodation/working, high = better): 141.7 %
Waterplane Area: 14,746 Square feet or 1,370 Square metres
Displacement factor (Displacement / loading): 203 %
Structure weight / hull surface area: 95 lbs/sq ft or 462 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.13
- Longitudinal: 3.07
- Overall: 1.25
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

Misc Weight includes provision for catapult and one seaplane
1,600 tons is cargo capacity

A design that is kicking around the drawing boards at the moment. What the designer calls a "River Battleship", something to dominate the Rio Paraguay. A vessel heavily armed and armoured to eliminate RSAN vessels on the river. As ususal as with all Argentine river gunboats they use standard Army guns rather than Navy guns.

Thoughts?

Project 617 Paraguay, Argentina River Battleship laid down 1942

Displacement:
1,231 t light; 1,326 t standard; 1,405 t normal; 1,468 t full load

Dimensions: Length overall / water x beam x draught
231.67 ft / 229.66 ft x 39.37 ft x 8.20 ft (normal load)
70.61 m / 70.00 m x 12.00 m x 2.50 m

Armament:
4 - 6.10" / 155 mm guns (2x2 guns), 97.00lbs / 44.00kg shells, 1933 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
4 - 2.95" / 75.0 mm guns in single mounts, 13.71lbs / 6.22kg shells, 1933 Model
Breech loading guns in deck mounts
on side, all amidships
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 0.00" / 0.0 mm guns in single mounts, 0.00lbs / 0.00kg shells, 1930 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 455 lbs / 206 kg
Shells per gun, main battery: 250

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.72" / 120 mm 82.02 ft / 25.00 m 8.20 ft / 2.50 m
Ends: Unarmoured
Main Belt covers 55 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.94" / 100 mm 2.95" / 75 mm -
2nd: 1.97" / 50 mm 0.79" / 20 mm -
3rd: 0.59" / 15 mm - -
4th: 0.39" / 10 mm - -

- Armour deck: 2.56" / 65 mm, Conning tower: 2.95" / 75 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2,100 shp / 1,566 Kw = 15.02 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 142 tons

Complement:
114 - 149

Cost:
£0.669 million / $2.677 million

Distribution of weights at normal displacement:
Armament: 65 tons, 4.6 %
Armour: 576 tons, 41.0 %
- Belts: 168 tons, 12.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 68 tons, 4.8 %
- Armour Deck: 332 tons, 23.6 %
- Conning Tower: 8 tons, 0.6 %
Machinery: 55 tons, 3.9 %
Hull, fittings & equipment: 506 tons, 36.0 %
Fuel, ammunition & stores: 174 tons, 12.4 %
Miscellaneous weights: 30 tons, 2.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,414 lbs / 2,002 Kg = 38.8 x 6.1 " / 155 mm shells or 1.7 torpedoes
Stability (Unstable if below 1.00): 1.48
Metacentric height 2.4 ft / 0.7 m
Roll period: 10.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.20
Seaboat quality (Average = 1.00): 1.80

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.663
Length to Beam Ratio: 5.83 : 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 39
Bow angle (Positive = bow angles forward): 7.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.40 ft / 5.00 m
- Forecastle (15 %): 16.40 ft / 5.00 m
- Mid (50 %): 16.40 ft / 5.00 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 12.30 ft / 3.75 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 53.3 %
- Above water (accommodation/working, high = better): 144.1 %
Waterplane Area: 7,009 Square feet or 651 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 52 lbs/sq ft or 253 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.44
- Overall: 1.00
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

Nasty.... >]

What Hoo said, but I don't think your 0mm machine guns are to useful.

Quoted

Originally posted by Sachmle
What Hoo said, but I don't think your 0mm machine guns are to useful.

How else would you record the laser cannon?

Quoted

Originally posted by BruceDuncan

Quoted

Originally posted by Sachmle
What Hoo said, but I don't think your 0mm machine guns are to useful.

How else would you record the laser cannon?

ROFLMAO!! XD

Quoted

Originally posted by Sachmle

Quoted

Originally posted by BruceDuncan

Quoted

Originally posted by Sachmle
What Hoo said, but I don't think your 0mm machine guns are to useful.

How else would you record the laser cannon?

ROFLMAO!! XD

Photon torpedoes are always more effective...

But Tricobalt ones more so.

Depends on the range and the mobility of the target.

On the design itsself, it might be more useful to put the guns in mount and hoist.

Quoted

Originally posted by TexanCowboy
On the design itsself, it might be more useful to put the guns in mount and hoist.

I'd defer to someone more familiar with shallow draft vessels, but I don't think that there is much space below deck for a hoist. But I could be wrong.

Quoted

Originally posted by BruceDuncan

Quoted

Originally posted by TexanCowboy
On the design itsself, it might be more useful to put the guns in mount and hoist.

I'd defer to someone more familiar with shallow draft vessels, but I don't think that there is much space below deck for a hoist. But I could be wrong.

Correct. Further, as the ship uses Army and not Navy guns, hoist mounts would defeat the purpose, frankly.

No room for a hoist, I'm trying for a turret but obviously its going to need lots of space to manhandle the 155mm rounds. ROF would be quite low for sustained fire.
I decided on eight 37mm simply to provide good AA defence and they will be useful for chewing up small wooden MGBs etc. The las.. er... machine guns will be 13mm for supporting infantry ashore and will be used for AA defence too. Recent war experience shows operating on the Rio Paraguay (especially upstream) in confined waters and with RSAF aircraft roaming about isn't healthy. Aircraft are the main threat, then shore batteries (diving fire) and then enemy gunboats. The idea is to destroy enemy gunboats already in position. SAE would then need to bring up heavier vessels upstream which might be tricky and time consuming.

Looking at Humiata and Paraguay (oohps name already in use!) I've made some refinements. They pack 4x 4.7 and 3x 76mm guns onto 600 tons and are the existing top dogs on the river.
Now it has less draught and more beam and less range (which isn't really needed as it won't be a seagoing warship).

Project 617 Rio Paraguay, Argentina River Battleship laid down 1942

Displacement:
1,351 t light; 1,435 t standard; 1,496 t normal; 1,544 t full load

Dimensions: Length overall / water x beam x draught
231.67 ft / 229.66 ft x 41.01 ft x 6.56 ft (normal load)
70.61 m / 70.00 m x 12.50 m x 2.00 m

Armament:
4 - 6.10" / 155 mm guns (2x2 guns), 97.00lbs / 44.00kg shells, 1933 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
4 - 2.95" / 75.0 mm guns in single mounts, 13.71lbs / 6.22kg shells, 1933 Model
Breech loading guns in deck mounts
on side, all amidships
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1930 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 456 lbs / 207 kg
Shells per gun, main battery: 200

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.72" / 120 mm 82.02 ft / 25.00 m 8.20 ft / 2.50 m
Ends: Unarmoured
Main Belt covers 55 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.95" / 75 mm 1.97" / 50 mm -
2nd: 1.97" / 50 mm 0.79" / 20 mm -
3rd: 0.39" / 10 mm - -
4th: 0.39" / 10 mm - -

- Armour deck: 2.56" / 65 mm, Conning tower: 2.95" / 75 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2,500 shp / 1,865 Kw = 15.08 kts
Range 2,000nm at 12.00 kts
Bunker at max displacement = 109 tons

Complement:
119 - 156

Cost:
£0.706 million / $2.823 million

Distribution of weights at normal displacement:
Armament: 65 tons, 4.3 %
Armour: 635 tons, 42.5 %
- Belts: 171 tons, 11.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 50 tons, 3.4 %
- Armour Deck: 405 tons, 27.1 %
- Conning Tower: 8 tons, 0.6 %
Machinery: 65 tons, 4.4 %
Hull, fittings & equipment: 556 tons, 37.2 %
Fuel, ammunition & stores: 144 tons, 9.6 %
Miscellaneous weights: 30 tons, 2.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
5,225 lbs / 2,370 Kg = 46.0 x 6.1 " / 155 mm shells or 1.8 torpedoes
Stability (Unstable if below 1.00): 1.47
Metacentric height 2.5 ft / 0.8 m
Roll period: 10.8 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.18
Seaboat quality (Average = 1.00): 1.50

Hull form characteristics:
Hull has rise forward of midbreak, low quarterdeck
Block coefficient: 0.847
Length to Beam Ratio: 5.60 : 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 47
Bow angle (Positive = bow angles forward): 7.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.40 ft / 5.00 m
- Forecastle (17 %): 16.40 ft / 5.00 m
- Mid (45 %): 16.40 ft / 5.00 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (17 %): 8.20 ft / 2.50 m (9.84 ft / 3.00 m before break)
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 12.20 ft / 3.72 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 51.5 %
- Above water (accommodation/working, high = better): 166.4 %
Waterplane Area: 8,555 Square feet or 795 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 50 lbs/sq ft or 246 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.11
- Overall: 1.00
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

In 1942 five of the standard Mendoza Class destroyers (armed with 130mm guns) will be refitted in 1942. It's amazing to realise these ships, among the first I designed in WW, are now a decade old.


Mendoza Class, Argentina Destroyer laid down 1931

Displacement:
1,761 t light; 1,877 t standard; 2,030 t normal; 2,152 t full load

Dimensions: Length overall / water x beam x draught
369.19 ft / 361.55 ft x 33.79 ft x 13.78 ft (normal load)
112.53 m / 110.20 m x 10.30 m x 4.20 m

Armament:
6 - 5.12" / 130 mm guns (3x2 guns), 70.55lbs / 32.00kg shells, 1931 Model
Breech loading guns in deck mounts with hoists
on centreline, evenly spread, 2 raised mounts
Aft Main mounts separated by engine room
10 - 1.46" / 37.0 mm guns (5x2 guns), 1.55lbs / 0.70kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 440 lbs / 199 kg
Shells per gun, main battery: 300
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
2nd: 0.98" / 25 mm - -

- Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 40,800 shp / 30,437 Kw = 34.02 kts
Range 3,200nm at 15.00 kts
Bunker at max displacement = 275 tons

Complement:
150 - 196

Cost:
£1.061 million / $4.245 million

Distribution of weights at normal displacement:
Armament: 52 tons, 2.6 %
Armour: 38 tons, 1.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 29 tons, 1.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 10 tons, 0.5 %
Machinery: 983 tons, 48.4 %
Hull, fittings & equipment: 664 tons, 32.7 %
Fuel, ammunition & stores: 269 tons, 13.2 %
Miscellaneous weights: 24 tons, 1.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
546 lbs / 248 Kg = 8.1 x 5.1 " / 130 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.85
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.422
Length to Beam Ratio: 10.70 : 1
'Natural speed' for length: 21.80 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 51
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: 21.00 ft / 6.40 m
- Forecastle (20 %): 20.34 ft / 6.20 m
- Mid (52 %): 20.34 ft / 6.20 m (10.50 ft / 3.20 m aft of break)
- Quarterdeck (15 %): 10.50 ft / 3.20 m
- Stern: 10.50 ft / 3.20 m
- Average freeboard: 15.67 ft / 4.78 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 179.4 %
- Above water (accommodation/working, high = better): 102.1 %
Waterplane Area: 7,919 Square feet or 736 Square metres
Displacement factor (Displacement / loading): 69 %
Structure weight / hull surface area: 40 lbs/sq ft or 195 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.31
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate

25% Refit Notes
Replacement of qaurterdeck 20mm singles with one 37mm twin
Addition of RDF set
Addition of Asdic set
New HACS IV
Refurbishment of internal fittings

The Ministry of the Navy today released this artists impression of the new Project 617 gunboat.

Top-weight much? That Bridge/CT is huge. The distance from the main deck to the RF is more than the depth of the hull from waterline to keel.

Quoted

Originally posted by Sachmle
Top-weight much? That Bridge/CT is huge. The distance from the main deck to the RF is more than the depth of the hull from waterline to keel.

I would tend to side with Sam on this one. Referring back to the design specifications,

Quoted

Stability (Unstable if below 1.00): 1.48
Metacentric height 2.4 ft / 0.7 m
Roll period: 10.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.20
Seaboat quality (Average = 1.00): 1.80

It begs the question how a design that looks to carry so much top hamper is so stable on paper. There may be a good and valid explanation, but at the moment it escapes me.

The L:B Ratio may explain it; it's a rather fat design.

Still;

My revised artists impression;


Better? I admit Shin's version is attractive though.

Quoted

Originally posted by BruceDuncan
It begs the question how a design that looks to carry so much top hamper is so stable on paper. There may be a good and valid explanation, but at the moment it escapes me.

Maybe because the superstructure is made of paper.