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1

Monday, August 9th 2004, 6:14pm

Filipino Armoured Gunboat for 1925

These are virtual clones of the Dutch Brinio-class "Pantersbooten" on page 279 of Jane's WW1.

I intend to build a number of these boats, starting Q1/25.

[EDIT: Changed the designator; Filipino gunboats will have class designations based on their armament.]

Filipino G-100 class gunboat, laid down 1925

Length, 172 ft x Beam, 28.0 ft x Depth, 9.0 ft
545 tons normal displacement (497 tons standard)

Main battery: 4 x 3.94-inch / 100mm
Light battery: 2 x 0.54-inch / 13.7mm

Weight of broadside: 122 lbs

Main belt, 2.0 inches; ends unarmored
Armor deck, average 0.75 inches
C.T., 2.0 inches

Battery armor:
Main, 0.5" shields


Maximum speed for 1500 shp = 16.09 knots
Approximate cruising radius, 5000 nm / 10 kts

Typical complement: 56-73


Estimated cost, $476,000 (£119,000)

Remarks:

Relative extent of belt armor, 54 percent of 'typical' coverage.

Good seaboat; rides out heavy weather easily.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.

Cramped ship; poor crew accommodation, limited working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 15 tons = 3 pct
Armor, total ..................... 77 tons = 14 pct

Belt 33 tons = 6 pct
Deck 39 tons = 7 pct
C.T. 3 tons = 1 pct
Armament 2 tons = 0 pct

Machinery ........................ 49 tons = 9 pct
Hull and fittings; equipment ..... 330 tons = 61 pct
Fuel, ammunition, stores ......... 69 tons = 13 pct
Miscellaneous weights ............ 5 tons = 1 pct
-----
545 tons = 100 pct

Estimated metacentric height, 1.0 ft

Displacement summary:

Light ship: 476 tons
Standard displacement: 497 tons
Normal service: 545 tons
Full load: 581 tons

Loading submergence 79 tons/foot

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.18

Shellfire needed to sink: 1213 lbs = 39.7 x 3.9-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 1.0
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 61 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.16

Relative quality as a seaboat: 1.22

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


Hull form characteristics:

Block coefficient: 0.44
Sharpness coefficient: 0.37
Hull speed coefficient 'M' = 6.43
'Natural speed' for length = 13.1 knots
Power going to wave formation
at top speed: 55 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 53 percent

Relative accommodation and working space: 75 percent


Displacement factor: 180 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.57
(Structure weight per square
foot of hull surface: 72 lbs)

Relative longitudinal hull strength: 4.90
(for 8.0 ft average freeboard;
freeboard adjustment -0.5 ft)

Relative composite hull strength: 1.76

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


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

172.00 x 28.00 x 9.00; 8.00 -- Dimensions
0.44 -- Block coefficient
1925 -- Year laid down
16.09 / 5000 / 10.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
5 tons -- Miscellaneous weights
++++++++++
4 x 3.94; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
0 -- No secondary battery
0 -- No tertiary (QF/AA) battery
2 x 0.54 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
2.00 / 0.00 / 0.00 / 0.00; 54 -- Belt armor; relative extent
0.75 / 2.00 -- Deck / CT
0.50 / 0.00 / 0.00 / 0.00 -- Battery armor


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


2

Wednesday, August 11th 2004, 9:31pm

I like her, I seem to have missed that little design in Janes, otherwise I likely would have copied her too.
Shes a good way to keep those pesky pirates at bay and perfect for all those Islands in the Phillipines.

I sure hope the funnel on your ship is better looking though!

3

Thursday, September 23rd 2004, 10:02pm

Final design

Since I had lots of hull strength to play with, I raised the freeboard and thickened the armour.

Filipino G-100 class gunboat, laid down 1925

Length, 172 ft x Beam, 28.0 ft x Depth, 9.0 ft
545 tons normal displacement (497 tons standard)

Main battery: 4 x 3.94-inch / 100mm
Light battery: 2 x 0.54-inch / 13.7mm

Weight of broadside: 128 lbs

Main belt, 4.0 inches; ends unarmored
Armor deck, average 1.0 inches
C.T., 2.5 inches

Battery armor:
Main, 1.97" shields


Maximum speed for 1500 shp = 16.09 knots
Approximate cruising radius, 5000 nm / 10 kts

Typical complement: 56-73


Estimated cost, $476,000 (£119,000)

Remarks:

Relative extent of belt armor, 54 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 15 tons = 3 pct
Armor, total ..................... 130 tons = 24 pct

Belt 67 tons = 12 pct
Deck 51 tons = 9 pct
C.T. 4 tons = 1 pct
Armament 8 tons = 1 pct

Machinery ........................ 49 tons = 9 pct
Hull and fittings; equipment ..... 277 tons = 51 pct
Fuel, ammunition, stores ......... 69 tons = 13 pct
Miscellaneous weights ............ 5 tons = 1 pct
-----
545 tons = 100 pct

Estimated metacentric height, 0.9 ft

Displacement summary:

Light ship: 476 tons
Standard displacement: 497 tons
Normal service: 545 tons
Full load: 581 tons

Loading submergence 79 tons/foot

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.14

Shellfire needed to sink: 1322 lbs = 43.2 x 3.9-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 1.1
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 70 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.22

Relative quality as a seaboat: 1.53

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


Hull form characteristics:

Block coefficient: 0.44
Sharpness coefficient: 0.37
Hull speed coefficient 'M' = 6.43
'Natural speed' for length = 13.1 knots
Power going to wave formation
at top speed: 55 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 53 percent

Relative accommodation and working space: 90 percent


Displacement factor: 153 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.18
(Structure weight per square
foot of hull surface: 57 lbs)

Relative longitudinal hull strength: 4.88
(for 9.6 ft average freeboard;
freeboard adjustment +1.1 ft)

Relative composite hull strength: 1.36

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


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

172.00 x 28.00 x 9.00; 9.60 -- Dimensions
0.44 -- Block coefficient
1925 -- Year laid down
16.09 / 5000 / 10.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
5 tons -- Miscellaneous weights
++++++++++
4 x 3.94; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
0 -- No secondary battery
0 -- No tertiary (QF/AA) battery
2 x 0.54 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
4.00 / 0.00 / 0.00 / 0.00; 54 -- Belt armor; relative extent
1.00 / 2.50 -- Deck / CT
1.97 / 0.00 / 0.00 / 0.00 -- Battery armor


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

4

Monday, October 4th 2004, 11:52pm

Final design

Added some extra armour (end and upper belts!) since I had oodles of hull strength left...also added an AA gun (a post-Otta-strike mod ;) ).

Also Metricsed, bent, folded, spindled and mutilitated.

Filipino G-100 class gunboat, laid down 1925

Length, 172 ft x Beam, 28.0 ft x Depth, 9.0 ft
545 tons normal displacement (497 tons standard)

Main battery: 4 x 3.94-inch / 100mm
AA battery: 1 x 2.24-inch / 57mm
Light battery: 2 x 0.54-inch / 13.7mm

Weight of broadside: 134 lbs

Main belt, 4.30 inches; bow and stern, 0.98 inches
Upper belt, 1.18 inches
Armor deck, average 1.18 inches
C.T., 2.56 inches

Battery armor:
Main, 1.97" shields
AA, 0.98" shields

Maximum speed for 1500 shp = 16.09 knots
Approximate cruising radius, 5000 nm / 10 kts

Typical complement: 56-73


Estimated cost, $483,000 (£121,000)

Remarks:

Relative extent of belt armor, 54 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 16 tons = 3 pct
Armor, total ..................... 177 tons = 32 pct

Belt 104 tons = 19 pct
Deck 61 tons = 11 pct
C.T. 4 tons = 1 pct
Armament 9 tons = 2 pct

Machinery ........................ 49 tons = 9 pct
Hull and fittings; equipment ..... 229 tons = 42 pct
Fuel, ammunition, stores ......... 69 tons = 13 pct
Miscellaneous weights ............ 5 tons = 1 pct
-----
545 tons = 100 pct

Estimated metacentric height, 0.9 ft

Displacement summary:

Light ship: 476 tons
Standard displacement: 497 tons
Normal service: 545 tons
Full load: 581 tons

Loading submergence 79 tons/foot

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.13

Shellfire needed to sink: 1294 lbs = 42.3 x 3.9-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 1.0
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 71 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.23

Relative quality as a seaboat: 1.51

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


Hull form characteristics:

Block coefficient: 0.44
Sharpness coefficient: 0.37
Hull speed coefficient 'M' = 6.43
'Natural speed' for length = 13.1 knots
Power going to wave formation
at top speed: 55 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 54 percent

Relative accommodation and working space: 90 percent


Displacement factor: 133 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.97
(Structure weight per square
foot of hull surface: 47 lbs)

Relative longitudinal hull strength: 3.87
(for 9.6 ft average freeboard;
freeboard adjustment +1.1 ft)

Relative composite hull strength: 1.11

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


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

172.00 x 28.00 x 9.00; 9.60 -- Dimensions
0.44 -- Block coefficient
1925 -- Year laid down
16.09 / 5000 / 10.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
5 tons -- Miscellaneous weights
++++++++++
4 x 3.94; 0 -- Main battery; turrets
Gun-shields
:
0 -- No secondary battery
1 x 2.24 -- Tertiary (QF/AA) battery
Gun-shields
:
2 x 0.54 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
4.30 / 0.98 / 1.18 / 0.00; 54 -- Belt armor; relative extent
1.18 / 2.56 -- Deck / CT
1.97 / 0.00 / 0.98 / 0.00 -- Battery armor


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

5

Tuesday, October 5th 2004, 3:52pm

I think you should be working to a hull strength of 1.50 or 2.00 considering that shes only good for 16knts.

6

Tuesday, October 5th 2004, 4:09pm

Hmm..

Hadn't thought of that, thanks for pointing it out.

1.37 will have to do...

Filipino G-100 class gunboat, laid down 1925

Length, 172 ft x Beam, 28.0 ft x Depth, 9.0 ft
545 tons normal displacement (497 tons standard)

Main battery: 4 x 3.94-inch / 100mm 52-cal Mk 23
Quick firing guns in deck mounts
in "diamond" arrangement, evenly spread
AA battery: 1 x 2.24-inch / 57mm
Dual purpose gun in a deck mount
on centerline end, aft, raised mount - superfiring
Light battery: 2 x 0.54-inch / 13.7mm
Machine guns in deck mounts
on side end, all aft

Weight of broadside: 134 lbs

Main belt, 3.94 inches; ends unarmored
Armor deck, average 0.98 inches
C.T., 2.24 inches

Battery armor:
Main, 1.57" shields
AA, 0.98" shields

Maximum speed for 1500 shp = 16.09 knots
Approximate cruising radius, 5000 nm / 10 kts

Typical complement: 56-73


Estimated cost, $483,000 (£121,000)

Remarks:

Relative extent of belt armor, 54 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 16 tons = 3 pct
Armor, total ..................... 126 tons = 23 pct

Belt 66 tons = 12 pct
Deck 50 tons = 9 pct
C.T. 3 tons = 1 pct
Armament 7 tons = 1 pct

Machinery ........................ 49 tons = 9 pct
Hull and fittings; equipment ..... 280 tons = 51 pct
Fuel, ammunition, stores ......... 69 tons = 13 pct
Miscellaneous weights ............ 5 tons = 1 pct
-----
545 tons = 100 pct

Estimated metacentric height, 0.9 ft

Displacement summary:

Light ship: 476 tons
Standard displacement: 497 tons
Normal service: 545 tons
Full load: 581 tons

Loading submergence 79 tons/foot

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.13

Shellfire needed to sink: 1295 lbs = 42.3 x 3.9-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 1.0
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 71 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.23

Relative quality as a seaboat: 1.52

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


Hull form characteristics:

Block coefficient: 0.44
Sharpness coefficient: 0.37
Hull speed coefficient 'M' = 6.43
'Natural speed' for length = 13.1 knots
Power going to wave formation
at top speed: 55 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 54 percent

Relative accommodation and working space: 90 percent


Displacement factor: 152 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.19
(Structure weight per square
foot of hull surface: 58 lbs)

Relative longitudinal hull strength: 4.89
(for 9.6 ft average freeboard;
freeboard adjustment +1.1 ft)

Relative composite hull strength: 1.37

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


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

172.00 x 28.00 x 9.00; 9.60 -- Dimensions
0.44 -- Block coefficient
1925 -- Year laid down
16.09 / 5000 / 10.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
5 tons -- Miscellaneous weights
++++++++++
4 x 3.94; 0 -- Main battery; turrets
Gun-shields
:
0 -- No secondary battery
1 x 2.24 -- Tertiary (QF/AA) battery
Gun-shields
:
2 x 0.54 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
3.94 / 0.00 / 0.00 / 0.00; 54 -- Belt armor; relative extent
0.98 / 2.24 -- Deck / CT
1.57 / 0.00 / 0.98 / 0.00 -- Battery armor


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

HoOmAn

Keeper of the Sacred Block Coefficient

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7

Tuesday, October 5th 2004, 5:04pm

What does "diamond arrangement" stand for?

8

Tuesday, October 5th 2004, 5:09pm

Quoted

What does "diamond arrangement" stand for?


He actually means a rhombus.

1 gun at stem, 1 at stern and 2 amidships


------X------
-X---------X-
------X------

9

Tuesday, October 5th 2004, 5:10pm

Quoted

What does "diamond arrangement" stand for?


The gun mounts are arranged like this:

------X------
--X----o-X--
------X------

X - 100mm
o - 57mm

EDIT: RA beat me to it. ;)