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Torpedo Boats

Doug Wise

Unregistered

1

Friday, February 10th 2006, 6:19am

Torpedo Boats

Tehran, T-1 (ex-PRS Prosperina), deleted ?
Baluchistan, T-2 (ex-PRS Rayo), deleted ?

Filipino Prosperina-class torpedo boat, laid down 1923

Length, 181 ft x Beam, 17.7 ft x Depth, 7.5 ft
316 tons normal displacement (283 tons standard)

Main battery: 1 x 2.24-inch / 57mm 42-cal
Light battery: 2 x 0.30-inch / 7.62mm

Weight of broadside: 6 lbs

4 TT, 18.0"

Hull unarmored

Battery armor:
Main, 0.5" shields


Maximum speed for 9954 shp = 27.90 knots
Approximate cruising radius, 4700 nm / 10 kts

Typical complement: 8 officers and 35 men


Estimated cost, $399,000 (£100,000)

Remarks:

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

Caution: Very cramped ship with excessively poor habitability;
lacks suitable working space.

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


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 1 tons = 0 pct
Machinery ........................ 171 tons = 54 pct
Hull and fittings; equipment ..... 104 tons = 33 pct
Fuel, ammunition, stores ......... 39 tons = 13 pct
Miscellaneous weights ............ 0 tons = 0 pct
-----
316 tons = 100 pct

Estimated metacentric height, 0.5 ft

Displacement summary:

Light ship: 276 tons
Standard displacement: 283 tons
Normal service: 316 tons
Full load: 341 tons

Loading submergence 54 tons/foot

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.12

Shellfire needed to sink: 108 lbs = 19.3 x 2.2-inch 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, 0.05

Relative quality as a seaboat: 1.02

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


Hull form characteristics:

Block coefficient: 0.46
Sharpness coefficient: 0.32
Hull speed coefficient 'M' = 8.12
'Natural speed' for length = 13.5 knots
Power going to wave formation
at top speed: 75 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 177 percent

Relative accommodation and working space: 39 percent


Displacement factor: 47 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.60
(Structure weight per square
foot of hull surface: 24 lbs)

Relative longitudinal hull strength: 2.90
(for 11.0 ft average freeboard;
freeboard adjustment +3.4 ft)

Relative composite hull strength: 0.70

Doug Wise

Unregistered

2

Sunday, February 26th 2006, 7:04am




Qom, T-3
Ahvaz, T-4

RM Ariete, Italian Torpedo Boat laid down 1930

Displacement:
607 t light; 627 t standard; 678 t normal; 719 t full load

Dimensions: Length overall / water x beam x draught
268.93 ft / 262.47 ft x 22.97 ft x 9.84 ft (normal load)
81.97 m / 80.00 m x 7.00 m x 3.00 m

Armament:
2 - 3.94" / 100 mm guns in single mounts, 30.51lbs / 13.84kg shells, 1930 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread, 1 raised mount
2 - 0.79" / 20.0 mm guns (1x2 guns), 0.24lbs / 0.11kg shells, 1930 Model
Anti-aircraft guns in deck mount
on side
Weight of broadside 62 lbs / 28 kg
Shells per gun, main battery: 200
6 - 17.7" / 450 mm above water torpedoes

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

- Conning tower: 0.79" / 20 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 20,000 shp / 14,920 Kw = 32.68 kts
Range 2,000nm at 15.00 kts
Bunker at max displacement = 92 tons

Complement:
66 - 86

Cost:
£0.313 million / $1.252 million

Distribution of weights at normal displacement:
Armament: 8 tons, 1.1 %
Armour: 5 tons, 0.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 337 tons, 49.7 %
Hull, fittings & equipment: 198 tons, 29.1 %
Fuel, ammunition & stores: 71 tons, 10.5 %
Miscellaneous weights: 60 tons, 8.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
161 lbs / 73 Kg = 5.3 x 3.9 " / 100 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.19
Seaboat quality (Average = 1.00): 0.79

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 11.43 : 1
'Natural speed' for length: 18.54 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 63
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.04 ft / 5.50 m
- Forecastle (20 %): 16.40 ft / 5.00 m
- Mid (30 %): 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: 10.79 ft / 3.29 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 178.8 %
- Above water (accommodation/working, high = better): 53.8 %
Waterplane Area: 3,851 Square feet or 358 Square metres
Displacement factor (Displacement / loading): 51 %
Structure weight / hull surface area: 24 lbs/sq ft or 116 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.24
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Doug Wise

Unregistered

3

Sunday, February 26th 2006, 7:20am

Bushehr, T-5, laid down 1930
Bandar-e Abbas, T-6, laid down 1930, lost 1938
Bandar-e Anzali, T-7, laid down 1930
Rasht, T-8, laid down 1930
Mashhad, T-9, laid down 1931
Kermann, T-10, laid down 1931
Yazd, T-11, laid down 1932
Bam, T-12, laid down 1932

Bushehr, Persian Torpedo Boat laid down 1930

Displacement:
554 t light; 570 t standard; 607 t normal; 637 t full load

Dimensions: Length overall / water x beam x draught
235.50 ft / 230.00 ft x 22.00 ft x 10.50 ft (normal load)
71.78 m / 70.10 m x 6.71 m x 3.20 m

Armament:
4 - 1.97" / 50.0 mm guns in single mounts, 3.81lbs / 1.73kg shells, 1926 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, 2 raised mounts - superfiring
6 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1926 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
Weight of broadside 18 lbs / 8 kg
Shells per gun, main battery: 350
4 - 24.0" / 609.6 mm above water torpedoes

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 18,520 shp / 13,816 Kw = 32.00 kts
Range 1,500nm at 15.00 kts
Bunker at max displacement = 66 tons

Complement:
60 - 79

Cost:
£0.274 million / $1.098 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.4 %
Machinery: 317 tons, 52.2 %
Hull, fittings & equipment: 211 tons, 34.8 %
Fuel, ammunition & stores: 53 tons, 8.7 %
Miscellaneous weights: 24 tons, 4.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
182 lbs / 82 Kg = 47.6 x 2.0 " / 50 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 48 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 0.90

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 10.45 : 1
'Natural speed' for length: 17.48 kts
Power going to wave formation at top speed: 73 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 18.00 ft / 5.49 m
- Forecastle (20 %): 12.00 ft / 3.66 m
- Mid (50 %): 12.00 ft / 3.66 m
- Quarterdeck (15 %): 12.00 ft / 3.66 m
- Stern: 12.00 ft / 3.66 m
- Average freeboard: 12.48 ft / 3.80 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 176.0 %
- Above water (accommodation/working, high = better): 35.5 %
Waterplane Area: 3,232 Square feet or 300 Square metres
Displacement factor (Displacement / loading): 52 %
Structure weight / hull surface area: 25 lbs/sq ft or 121 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 5.62
- Overall: 0.64
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is extremely poor
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Vukovlad

Me too !!!

Posts: 4,137

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4

Sunday, February 17th 2008, 6:31am

Vendidad Class
(simmed by Earl822)

Vendidad - sold to China, 1941


[SIZE=1](drawn by BCRenown)[/SIZE]

Displacement:
1,993 t light; 2,071 t standard; 2,148 t normal; 2,210 t full load

Dimensions: Length overall / water x beam x draught
394.41 ft / 390.00 ft x 37.80 ft x 12.00 ft (normal load)
120.22 m / 118.87 m x 11.52 m x 3.66 m

Armament:
6 - 3.00" / 76.2 mm guns (3x2 guns), 13.50lbs / 6.12kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
4 - 1.46" / 37.0 mm guns (1x4 guns), 1.65lbs / 0.75kg shells, 1935 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
8 - 0.79" / 20.0 mm guns in single mounts, 0.27lbs / 0.12kg shells, 1935 Model
Machine guns in deck mounts
on side, all amidships, 4 raised mounts - superfiring
Weight of broadside 90 lbs / 41 kg
Shells per gun, main battery: 640
8 - 18.0" / 457.2 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 0.50" / 13 mm -
2nd: 0.50" / 13 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 61,264 shp / 45,703 Kw = 37.50 kts
Range 1,505nm at 15.00 kts
Bunker at max displacement = 139 tons

Complement:
157 - 205

Cost:
£1.328 million / $5.312 million

Distribution of weights at normal displacement:
Armament: 11 tons, 0.5 %
Armour: 8 tons, 0.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 8 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,298 tons, 60.4 %
Hull, fittings & equipment: 662 tons, 30.8 %
Fuel, ammunition & stores: 155 tons, 7.2 %
Miscellaneous weights: 15 tons, 0.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
476 lbs / 216 Kg = 35.2 x 3.0 " / 76 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 1.7 ft / 0.5 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.11
Seaboat quality (Average = 1.00): 0.97

Hull form characteristics:
Hull has raised forecastle, rise forward of midbreak
and transom stern
Block coefficient: 0.425
Length to Beam Ratio: 10.32 : 1
'Natural speed' for length: 22.70 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 72
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.00 ft / 7.62 m
- Forecastle (40 %): 21.00 ft / 6.40 m (20.00 ft / 6.10 m aft of break)
- Mid (40 %): 20.00 ft / 6.10 m (14.00 ft / 4.27 m aft of break)
- Quarterdeck (10 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 17.44 ft / 5.32 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 201.0 %
- Above water (accommodation/working, high = better): 118.0 %
Waterplane Area: 9,576 Square feet or 890 Square metres
Displacement factor (Displacement / loading): 60 %
Structure weight / hull surface area: 35 lbs/sq ft or 170 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.16
- Overall: 0.57
Hull space for machinery, storage, compartmentation is extremely poor
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Class: T-13 Vendidad

This post has been edited 5 times, last edit by "Vukovlad" (Feb 12th 2010, 7:32pm)