WesWorld

12 Killed in Collision

A collision has occured between the 5000grt, Italian freighter, SS Doris Star and a Greek contemporary, the SS Endelacus, also of 5000grt. In the early hours of the morning on 24th September, the collision happened between both vessels when they were coursing the Adriatic sea.

Interviewing the first mate, who seemed to have drunk, of of the Doris Star, The Rome Revue uncovers an intruiging tale;
"It was about 0500hrs when we were just cruising along, nice and steady at a lesuirely 10knts, when out of a patch mist came this great shape which materlised into the SS Endelacus. It was behaving erraticly, i'm sure the captain must have been drunk. Anyway it was coming more or less straight for us, so we double checked our lights and they were on full power. At 1000yds they were still coming straight for us, so i swung the wheel over hard to port to get out of the idiot's way. This is when he turned into us and rammed us admidships. We were both going down to davy jones' locker so us on the Doris Star abandoned ship fairly quickly, just jumping into the water. "
"Then another Greek frieghter, we couldn't see her name came torwards the survivors in the water. We swam over towards her but she didn't pick any of us up, she just saved the Greek fellows then ran off."

4 hours later MM Sentinel, one of the Guardino class frigates was able to rescue the 5 remaining Italian seamen, the other's having drowned. Thanks to the MMs timely intervention at least some of the crew was saved.

When the Rome Revue asked the Greek embasy for an explanation they said that the Italian ship had deliberately rammed their freighter and that the second Greek freighter had combed the area for hours without luck.

And I had great hopes for improved Greco-Italian relations!

Sounds like both greece and italy need bigger coastguard fleets to deal with careless merchant ships.

... instead of the Cruisers and Battleships. :-)

Walter

Yes, some 500t patrol boats were on my 'to-do' list. They only mount some 40mm guns so unfortunately they can't sink anything.

Is speed the reason for the light armament ?

Walter

Perhaps something like this could be of use to you...
[Edit: Whoops! Forgot the torpedoes! ;;]

Hayashibara ^_^
Japan Destroyer laid down 1925

Displacement:
476 t light; 494 t standard; 539 t normal; 573 t full load
Loading submergence 74 tons/feet

Dimensions:
220.00 ft x 22.00 ft x 10.00 ft (normal load)
67.06 m x 6.71 m x 3.05 m

Armament:
4 - 3.15" / 80 mm guns (4 Main turrets x 1 guns, 2 superfiring turrets)
4 - 1.97" / 50 mm AA guns
12 - 0.98" / 25 mm guns
Weight of broadside 83 lbs / 38 kg
2 - 21.0" / 533.4 mm above water torpedoes

Armour:
Main turrets 1.00" / 25 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 14,023 shp / 10,461 Kw = 29.00 kts
Range 3,100nm at 12.00 kts

Complement:
55 - 72

Cost:
£0.200 million / $0.800 million

Distribution of weights at normal displacement:
Armament: 10 tons, 1.9 %
Armour: 18 tons, 3.4 %
Belts: 0 tons, 0.0 %, Armament: 18 tons, 3.4 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 0 tons, 0.0 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 255 tons, 47.3 %
Hull, fittings & equipment: 163 tons, 30.1 %
Fuel, ammunition & stores: 63 tons, 11.7 %
Miscellaneous weights: 30 tons, 5.6 %

Metacentric height 0.6

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is cramped

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.05
Shellfire needed to sink: 137 lbs / 62 Kg = 8.8 x 3.1 " / 80 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 50 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.70
Relative quality as seaboat: 1.00

Hull form characteristics:
Block coefficient: 0.390
Sharpness coefficient: 0.29
Hull speed coefficient 'M': 8.26
'Natural speed' for length: 14.83 kts
Power going to wave formation at top speed: 70 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 173.4 %
Relative accommodation and working space: 74.6 %
(Average = 100%)
Displacement factor: 52 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.50
(Structure weight / hull surface area: 27 lbs / square foot or 133 Kg / square metre)
Relative longitudinal hull strength: 2.01
(for 11.70 ft / 3.57 m average freeboard, freeboard adjustment 3.26 ft)
Relative composite hull strength: 0.58

Walter

Patrol Boat, laid down 1918

Length, 45.0 m x Beam, 4.5 m x Depth, 1.4 m
229 tonnes normal displacement (194 tonnes standard)

Main battery: 1 x 5.7-cm (1 x 1 fwd)
Secondary battery: 2 x 3.7-cm (1 x 2 aft)
Light battery: 4 x 1.3-cm

Weight of broadside: 4 kg

Hull unarmored

Battery armor:
Main, 2.5 cm shields / secondary, 2.5 cm shields


Maximum speed for 4372 shaft kw = 24.00 knots
Approximate cruising radius, 3000 nm / 12 knots

Typical complement: 29-38


Estimated cost, $193,000 (£48,000)

Remarks:

Caution: Hull structure is subject to strain in open-sea
conditions.

Oil firing.

Magazines and engineering spaces are cramped, with poor
watertight subdivision.

Roomy upper decks; superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 1 tonnes = 0 pct
Armor, total ..................... 1 tonnes = 1 pct

Armament 1 tonnes = 1 pct

Machinery ........................ 118 tonnes = 52 pct
Hull and fittings; equipment ..... 58 tonnes = 25 pct
Fuel, ammunition, stores ......... 40 tonnes = 18 pct
Miscellaneous weights ............ 10 tonnes = 4 pct
-----
229 tonnes = 100 pct

Estimated metacentric height, 0.1 m

Displacement summary:

Light ship: 188 tonnes
Standard displacement: 194 tonnes
Normal service: 229 tonnes
Full load: 256 tonnes

Loading submergence 176 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.23

Shellfire needed to sink: 39 kg = 15.0 x 5.7-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.1
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 51 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.13

Relative quality as a seaboat: 1.01

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.80
Sharpness coefficient: 0.42
Hull speed coefficient 'M' = 7.37
'Natural speed' for length = 12.1 knots
Power going to wave formation
at top speed: 78 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 175 percent

Relative accommodation and working space: 132 percent


Displacement factor: 52 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.50
(Structure weight per square
metre of hull surface: 80 kg)

Relative longitudinal hull strength: 2.29
(for 3.30 m average freeboard;
freeboard adjustment +1.13 m)

Relative composite hull strength: 0.58

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

147.60 x 14.76 x 4.59; 10.82 -- Dimensions
0.80 -- Block coefficient
1918 -- Year laid down
24.00 / 3000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
10 tons -- Miscellaneous weights
++++++++++
1 x 2.24; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
2 x 1.46; 0 -- Secondary battery; turrets
Gun-shields
:
0 -- No tertiary (QF/AA) battery
4 x 0.51 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
0.98 / 0.98 / 0.00 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Not a bad design Admiral K.
Useful 'for those really hard to get to spots'. ;-)

My design is a 3rd class destroyer design. For it to become a more useful patrol boat, I would ditch a few misc. tons, slightly alter dimensions, and increase the range.
I would use such kind of patrol boat on the more open sea where I can utilize its speed while I would keep your kind of patrol boats 'for those really hard to get to spots' where high speeds would mean hitting the rocks.

Walter

Quoted

while I would keep your kind of patrol boats 'for those really hard to get to spots' where high speeds would mean hitting the rocks.

Indeed. You may have noticed that the seakeeping on my boat isn't up to my usual standards. Good for harbor and coastal patrol/rescue/customs work, but not quite what I'd want on the high seas preventing indifferently piloted merchies banging together. You seem to have that covered.

well, good admiral. your design is a lot smaller and shallower so the seekeeping will not be that good. But it is really kewl :-)

Bernhard

Looks like things (hopefully? *g*) will get interesting in the Med......

As for those two small patrol craft designs: Both seem to be interesting but I´d prefer the japanese version.

As I pointed out, my design is a 3rd Class Destroyer (meaning <600 tons) so not specifically designed to function as a patrol boat. The Admiral's version has to advantage to get to those really hard to get to spots' while mine has a speed advantage.

A slightly altered version would look like this, less misc. load, slightly bigger range, 10 feet longer:

Hayashibara, Japan Patrol boat version laid down 1925

Displacement:
475 t light; 494 t standard; 564 t normal; 618 t full load
Loading submergence 77 tons/feet

Dimensions:
230.00 ft x 22.00 ft x 10.00 ft (normal load)
70.10 m x 6.71 m x 3.05 m

Armament:
4 - 3.15" / 80 mm guns (4 Main turrets x 1 guns, 2 superfiring turrets)
4 - 1.97" / 50 mm AA guns
12 - 0.98" / 25 mm guns
Weight of broadside 83 lbs / 38 kg
2 - 21.0" / 533.4 mm above water torpedoes

Armour:
Main turrets 1.00" / 25 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 13,929 shp / 10,391 Kw = 29.00 kts
Range 4,700nm at 12.00 kts

Complement:
57 - 75

Cost:
£0.207 million / $0.826 million

Distribution of weights at normal displacement:
Armament: 10 tons, 1.9 %
Armour: 18 tons, 3.3 %
Belts: 0 tons, 0.0 %, Armament: 18 tons, 3.3 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 0 tons, 0.0 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 269 tons, 47.8 %
Hull, fittings & equipment: 167 tons, 29.7 %
Fuel, ammunition & stores: 88 tons, 15.7 %
Miscellaneous weights: 10 tons, 1.8 %

Metacentric height 0.6

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is cramped

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.13
Shellfire needed to sink: 153 lbs / 69 Kg = 9.8 x 3.1 " / 80 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 55 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.66
Relative quality as seaboat: 1.10

Hull form characteristics:
Block coefficient: 0.390
Sharpness coefficient: 0.29
Hull speed coefficient 'M': 8.51
'Natural speed' for length: 15.17 kts
Power going to wave formation at top speed: 68 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 170.3 %
Relative accommodation and working space: 76.6 %
(Average = 100%)
Displacement factor: 55 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.50
(Structure weight / hull surface area: 27 lbs / square foot or 131 Kg / square metre)
Relative longitudinal hull strength: 1.83
(for 11.70 ft / 3.57 m average freeboard, freeboard adjustment 3.18 ft)
Relative composite hull strength: 0.57

Walter