Sloops and Gunboats

Guinness · July 16, 2020, 06:15:18 PM

Information about Sloops of Imperial Navy can be found here.

Guinness · July 17, 2020, 08:22:05 AM

Songshu Class

(Purchased from Parthia)

8 ships:
Songshu 1-8 (ld 1894, refit 1904)

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Songshu, China Rivirine Gunboat laid down 1894

Displacement:
250 t light; 272 t standard; 284 t normal; 293 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(161.95 ft / 157.48 ft) x 26.25 ft x (3.94 / 4.04 ft)
(49.36 m / 48.00 m) x 8.00 m x (1.20 / 1.23 m)

Armament:
1 - 4.72" / 120 mm 40.0 cal gun - 50.71lbs / 23.00kg shells, 200 per gun
Breech loading gun in deck mount, 1889 Model
1 x Single mount on centreline, forward deck centre
1 - 4.65" / 118 mm 20.0 cal gun - 44.09lbs / 20.00kg shells, 300 per gun
Breech loading gun in deck mount, 1889 Model
1 x Single mount on sides forward
8 - 0.59" / 15.0 mm 74.0 cal guns - 0.11lbs / 0.05kg shells, 5,000 per gun
Machine guns in deck mounts, 1886 Model
4 x Twin mounts on side ends, evenly spread
4 raised mounts
2 - 1.77" / 45.0 mm 40.0 cal guns - 2.64lbs / 1.20kg shells, 300 per gun
Quick firing guns in casemate mounts, 1889 Model
2 x Single mounts on sides, forward deck aft
Weight of broadside 101 lbs / 46 kg

This is a casement armor clad, able to defeat small arms

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0.79" / 20 mm 55.12 ft / 16.80 m 6.56 ft / 2.00 m
Ends: Unarmoured
Upper: 0.39" / 10 mm 55.12 ft / 16.80 m 9.19 ft / 2.80 m
Main Belt covers 54 % of normal length

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

- Armoured deck - single deck: 0.39" / 10 mm For and Aft decks

- Conning towers: Forward 0.59" / 15 mm, Aft 0.00" / 0 mm

Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 2 shafts, 163 ihp / 122 Kw = 9.50 kts
Range 1,600nm at 6.00 kts
Bunker at max displacement = 20 tons (100% coal)

Complement:
33 - 44

Cost:
£0.017 million / $0.067 million

Distribution of weights at normal displacement:
Armament: 12 tons, 4.1 %
Armour: 44 tons, 15.6 %
- Belts: 25 tons, 9.0 %
- Armament: 6 tons, 2.0 %
- Armour Deck: 13 tons, 4.4 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 31 tons, 10.8 %
Hull, fittings & equipment: 161 tons, 56.8 %
Fuel, ammunition & stores: 33 tons, 11.7 %
Miscellaneous weights: 3 tons, 1.1 %
- Above deck: 3 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,615 lbs / 733 Kg = 30.6 x 4.7 " / 120 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.34
Metacentric height 1.1 ft / 0.3 m
Roll period: 10.3 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- Recoil effect (Restricted arc if above 1.00): 0.38
Seaboat quality (Average = 1.00): 1.60

Hull form characteristics:
Hull has low forecastle, low quarterdeck ,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.610 / 0.613
Length to Beam Ratio: 6.00 : 1
'Natural speed' for length: 12.55 kts
Power going to wave formation at top speed: 31 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 33.00 %, 5.58 ft / 1.70 m, 5.58 ft / 1.70 m
- Forward deck: 17.00 %, 13.78 ft / 4.20 m, 13.78 ft / 4.20 m
- Aft deck: 18.00 %, 13.78 ft / 4.20 m, 13.78 ft / 4.20 m
- Quarter deck: 32.00 %, 5.58 ft / 1.70 m, 5.58 ft / 1.70 m
- Average freeboard: 8.45 ft / 2.58 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 53.1 %
- Above water (accommodation/working, high = better): 242.7 %
Waterplane Area: 3,051 Square feet or 283 Square metres
Displacement factor (Displacement / loading): 198 %
Structure weight / hull surface area: 41 lbs/sq ft or 198 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 2.89
- 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

These vessels are designed to operate in rivers such as the Tigris, or Don. They can be shipped by rail in sections. The propellers are in tunnels to avoid fouling. Overall, they somewhat resemble the Confederate Casement Ironclads, but with only the middle third in the casement, allowing guns to be mounted fore and aft.

Draft is that of the OTL Insect Class, which operated in the Tigris River.

The forward 120mm is a conventional naval rifle.
The 118L20 is a howitzer.
The twin 15mm guns are Gardner handcranked machine guns on the roof.
10mm gunshields are provided.
A pair of 45mm QF are casement mounted amidships. This can fire fore/aft, or engage targets on the beam. While lacking the punch of the main guns, they allow suppressive fire totally under armor, and the small HE charge in the gun is sufficient to quickly engage and destroy enemy field peices.

The raised amidships superstructure is covered by 10mm armor and slanted back at 30 degrees (for a Cos30 O/H = 2.8m), this is expected to defeat all small arms.
The main belt covers from +1.7 to -0.3m with 20mm armor, protecting the engines and magazines. This is expected to defeat any field gun HE rounds, as field guns will not be fitted with

Range is for 10 days.

Miscellaneous weights :
3t - Extra ventilation

Decks :
+4.2
+1.7 1st Deck
-1.2 Engineering deck.

Guinness · July 17, 2020, 08:23:53 AM

Xuediao Class

(Purchased from Rome)

4 ships in class
Xuediao 1-4 (ld 1900, refit 1910)

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Vigil I, Imperial Roman Navy Sloop laid down 1900

Displacement:
740 t light; 765 t standard; 879 t normal; 970 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(223.09 ft / 219.82 ft) x 29.53 ft x (8.20 / 8.89 ft)
(68.00 m / 67.00 m) x 9.00 m x (2.50 / 2.71 m)

Armament:
2 - 5.51" / 140 mm 45.0 cal guns - 79.37lbs / 36.00kg shells, 60 per gun
Quick firing guns in deck mount, 1897 Model
1 x Single mount on centreline forward
2 - 2.95" / 75.0 mm 45.0 cal guns - 13.23lbs / 6.00kg shells, 150 per gun
Quick firing guns in deck mounts, 1897 Model
2 x Single mounts on sides, forward deck aft
Weight of broadside 185 lbs / 84 kg

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

- Protected deck - single deck:
For and Aft decks: 0.39" / 10 mm
Forecastle: 0.20" / 5 mm Quarter deck: 0.20" / 5 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 1,400 ihp / 1,044 Kw = 14.83 kts
Range 3,500nm at 10.00 kts
Bunker at max displacement = 206 tons (100% coal)

Complement:
79 - 104

Cost:
£0.066 million / $0.263 million

Distribution of weights at normal displacement:
Armament: 34 tons, 3.9 %
- Guns: 34 tons, 3.9 %
Armour: 35 tons, 4.0 %
- Armament: 4 tons, 0.5 %
- Armour Deck: 31 tons, 3.5 %
Machinery: 219 tons, 24.9 %
Hull, fittings & equipment: 262 tons, 29.8 %
Fuel, ammunition & stores: 139 tons, 15.9 %
Miscellaneous weights: 190 tons, 21.6 %
- Hull below water: 20 tons
- Hull above water: 100 tons
- On freeboard deck: 50 tons
- Above deck: 20 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,119 lbs / 508 Kg = 13.4 x 5.5 " / 140 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.30
Metacentric height 1.3 ft / 0.4 m
Roll period: 10.9 seconds
Steadiness - As gun platform (Average = 50 %): 98 %
- Recoil effect (Restricted arc if above 1.00): 0.26
Seaboat quality (Average = 1.00): 1.95

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.578 / 0.589
Length to Beam Ratio: 7.44 : 1
'Natural speed' for length: 14.83 kts
Power going to wave formation at top speed: 46 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 1.54 ft / 0.47 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Forward deck: 30.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Aft deck: 35.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Quarter deck: 15.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Average freeboard: 9.84 ft / 3.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 105.6 %
- Above water (accommodation/working, high = better): 110.3 %
Waterplane Area: 4,650 Square feet or 432 Square metres
Displacement factor (Displacement / loading): 117 %
Structure weight / hull surface area: 40 lbs/sq ft or 197 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.85
- Overall: 1.00
Adequate machinery, storage, compartmentation space
Adequate accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Guinness · July 17, 2020, 08:25:36 AM

Huan Class

(Purchased from Parthia)

9 ships in class
Huan 1-9 (ld 1907)

Quote
Vigil III, Imperial Roman Navy Sloop laid down 1907

Displacement:
750 t light; 776 t standard; 889 t normal; 980 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(223.11 ft / 219.82 ft) x 29.53 ft x (8.20 / 8.88 ft)
(68.00 m / 67.00 m) x 9.00 m x (2.50 / 2.71 m)

Armament:
2 - 5.51" / 140 mm 50.0 cal guns - 85.98lbs / 39.00kg shells, 60 per gun
Quick firing guns in deck mounts, 1902 Model
2 x Single mounts on centreline ends, evenly spread
2 - 2.95" / 75.0 mm 50.0 cal guns - 13.23lbs / 6.00kg shells, 150 per gun
Quick firing guns in deck mounts, 1902 Model
2 x Single mounts on sides, forward deck aft
Weight of broadside 198 lbs / 90 kg

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

- Protected deck - single deck:
For and Aft decks: 0.59" / 15 mm
Forecastle: 0.20" / 5 mm Quarter deck: 0.20" / 5 mm

Machinery:
Coal and oil fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 2,000 ihp / 1,492 Kw = 16.22 kts
Range 4,000nm at 10.00 kts
Bunker at max displacement = 204 tons (90% coal)

Complement:
80 - 105

Cost:
£0.068 million / $0.272 million

Distribution of weights at normal displacement:
Armament: 40 tons, 4.5 %
- Guns: 40 tons, 4.5 %
Armour: 51 tons, 5.7 %
- Armament: 6 tons, 0.6 %
- Armour Deck: 45 tons, 5.1 %
Machinery: 220 tons, 24.7 %
Hull, fittings & equipment: 261 tons, 29.4 %
Fuel, ammunition & stores: 139 tons, 15.7 %
Miscellaneous weights: 178 tons, 20.0 %
- Hull below water: 8 tons
- Hull above water: 100 tons
- On freeboard deck: 50 tons
- Above deck: 20 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,161 lbs / 526 Kg = 13.9 x 5.5 " / 140 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.34
Metacentric height 1.4 ft / 0.4 m
Roll period: 10.7 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.21
Seaboat quality (Average = 1.00): 1.61

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.584 / 0.595
Length to Beam Ratio: 7.44 : 1
'Natural speed' for length: 14.83 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.66 ft / 0.20 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Forward deck: 30.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Aft deck: 35.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Quarter deck: 15.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Average freeboard: 9.84 ft / 3.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 104.9 %
- Above water (accommodation/working, high = better): 109.6 %
Waterplane Area: 4,676 Square feet or 434 Square metres
Displacement factor (Displacement / loading): 115 %
Structure weight / hull surface area: 41 lbs/sq ft or 199 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.86
- Overall: 1.00
Adequate machinery, storage, compartmentation space
Adequate accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Sloops and Gunboats

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