Rio Serena class , Peru Patrol boat laid down 1893
1893
Rio Serena
Rio Moropa
Rio Pastaza
1894
Rio Tigre
Rio Putumayo
Rio Napo
Displacement:
150 t light; 154 t standard; 157 t normal; 159 t full load
Dimensions: Length overall / water x beam x draught
131.23 ft / 131.23 ft x 17.72 ft x 5.91 ft (normal load)
40.00 m / 40.00 m x 5.40 m x 1.80 m
Armament:
2 - 2.00" / 50.8 mm guns in single mounts, 4.00lbs / 1.81kg shells, 1893 Model
Quick firing guns in deck mounts
on centreline, evenly spread
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1893 Model
Quick firing guns in deck mounts
on side, evenly spread
Weight of broadside 8 lbs / 4 kg
Shells per gun, main battery: 200
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0.79" / 20 mm 124.67 ft / 38.00 m 6.17 ft / 1.88 m
Ends: Unarmoured
Main Belt covers 146 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm - -
2nd: 0.79" / 20 mm - -
- Armour deck: 0.50" / 13 mm
Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 2 shafts, 260 ihp / 194 Kw = 12.31 kts
Range 900nm at 5.00 kts
Bunker at max displacement = 6 tons (100% coal)
Complement:
21 - 28
Cost:
£0.013 million / $0.052 million
Distribution of weights at normal displacement:
Armament: 1 tons, 0.6 %
Armour: 39 tons, 24.6 %
- Belts: 24 tons, 15.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 1.1 %
- Armour Deck: 13 tons, 8.4 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 49 tons, 31.2 %
Hull, fittings & equipment: 56 tons, 35.7 %
Fuel, ammunition & stores: 7 tons, 4.6 %
Miscellaneous weights: 5 tons, 3.2 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
180 lbs / 82 Kg = 45.1 x 2.0 " / 51 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.40
Metacentric height 0.7 ft / 0.2 m
Roll period: 9.1 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 1.88
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.400
Length to Beam Ratio: 7.41 : 1
'Natural speed' for length: 11.46 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 38
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: 8.86 ft / 2.70 m
- Forecastle (18 %): 8.86 ft / 2.70 m
- Mid (30 %): 4.92 ft / 1.50 m
- Quarterdeck (10 %): 4.92 ft / 1.50 m
- Stern: 4.92 ft / 1.50 m
- Average freeboard: 5.87 ft / 1.79 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 110.3 %
- Above water (accommodation/working, high = better): 68.1 %
Waterplane Area: 1 431 Square feet or 133 Square metres
Displacement factor (Displacement / loading): 105 %
Structure weight / hull surface area: 24 lbs/sq ft or 117 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.27
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
They look like handy little short-range patrol boats.
Belt and deck armor on a 150t ship? Why? She's so expendable it's not worth it. I'd put the weight saved into more range or speed. Other than that she is a handy little ship.
Ahoj!
Quote from: Sachmle on April 03, 2008, 02:20:47 PM
Belt and deck armor on a 150t ship?
Wait until you see more of Jefgte's designs.
He's quite an excentric :)
Borys
I've seen some on the other discussion boards I frequent. He also does out-f*ckin'-standing scratch built models.
So we are in for a ride then? ???
Belt & armour are just 20mm
I install them for the stability.
The machinery is 49T for 12.3kts on a 150T ship - 33% of the deplacement.
When I remove the belt armour the ship nearly caspize.
Jef
Quote from: Ithekro on April 03, 2008, 03:27:54 PM
So we are in for a ride then? ???
http://www.phpbbplanet.com/warshipprojects/viewtopic.php?t=1623&mforum=warshipprojects (http://www.phpbbplanet.com/warshipprojects/viewtopic.php?t=1623&mforum=warshipprojects)
Jef's scratch-built family of WWII
Panzerschiffs.
As you can see, had the Kriegsmarine had this man working for them, they'd have probably won the naval war. ;)
A better Serana Coastal Gun Boat
more guns & range increase
Serena, Peru Coastal Gun Boat laid down 1893
Displacement:
150 t light; 156 t standard; 173 t normal; 187 t full load
Dimensions: Length overall / water x beam x draught
124.67 ft / 124.67 ft x 17.81 ft x 6.59 ft (normal load)
38.00 m / 38.00 m x 5.43 m x 2.01 m
Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1893 Model
Breech loading gun in deck mount
on centreline
4 - 2.00" / 50.8 mm guns in single mounts, 4.00lbs / 1.81kg shells, 1893 Model
Quick firing guns in deck mounts
on side, evenly spread
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1893 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 30 lbs / 13 kg
Shells per gun, main battery: 120
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm - -
2nd: 0.79" / 20 mm - -
Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 2 shafts, 250 ihp / 186 Kw = 12.38 kts
Range 3 000nm at 7.00 kts
Bunker at max displacement = 31 tons (100% coal)
Complement:
23 - 31
Cost:
£0.015 million / $0.060 million
Distribution of weights at normal displacement:
Armament: 4 tons, 2.1 %
Armour: 4 tons, 2.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 4 tons, 2.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 47 tons, 27.2 %
Hull, fittings & equipment: 85 tons, 49.1 %
Fuel, ammunition & stores: 23 tons, 13.4 %
Miscellaneous weights: 10 tons, 5.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
235 lbs / 106 Kg = 17.4 x 3.0 " / 76 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 0.5 ft / 0.1 m
Roll period: 10.8 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0.27
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.414
Length to Beam Ratio: 7.00 : 1
'Natural speed' for length: 13.31 kts
Power going to wave formation at top speed: 46 %
Trim (Max stability = 0, Max steadiness = 100): 36
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: 13.12 ft / 4.00 m
- Forecastle (15 %): 12.30 ft / 3.75 m
- Mid (40 %): 8.37 ft / 2.55 m
- Quarterdeck (8 %): 8.37 ft / 2.55 m
- Stern: 8.37 ft / 2.55 m
- Average freeboard: 9.50 ft / 2.90 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 111.1 %
- Above water (accommodation/working, high = better): 106.8 %
Waterplane Area: 1 431 Square feet or 133 Square metres
Displacement factor (Displacement / loading): 126 %
Structure weight / hull surface area: 25 lbs/sq ft or 123 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.76
- Longitudinal: 11.86
- Overall: 1.00
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