France 1870 restart

[Jefgte]

I have noted that French ships are undergunned vs all stranger designs.
I have more ships (74) but smaller.

I "ll rework all SS to increase firepower & reduce a little the number of ships.

Jef

[Jefgte]

First class BB

Update from 6x274 to 8x274

BB-8x274+4x194, France BB laid down 1870

Displacement:
   6 540 t light; 6 888 t standard; 7 264 t normal; 7 565 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (301.84 ft / 295.28 ft) x 52.49 ft (Bulges 59.06 ft) x (23.29 / 24.20 ft)
   (92.00 m / 90.00 m) x 16.00 m (Bulges 18.00 m)  x (7.10 / 7.38 m)

Armament:
      2 - 10.79" / 274 mm 20.0 cal guns - 470.75lbs / 213.53kg shells, 75 per gun
     Breech loading guns in casemate mounts, 1870 Model
     2 x Single mounts on centreline ends, evenly spread
      6 - 10.79" / 274 mm 20.0 cal guns - 470.75lbs / 213.53kg shells, 75 per gun
     Breech loading guns in casemate mounts, 1870 Model
     6 x Single mounts on sides, evenly spread
      4 - 7.64" / 194 mm 20.0 cal guns - 167.09lbs / 75.79kg shells, 120 per gun
     Breech loading guns in casemate mounts, 1870 Model
     4 x Single mounts on sides, evenly spread
      4 - 1.85" / 47.0 mm 45.0 cal guns - 2.67lbs / 1.21kg shells, 150 per gun
     Breech loading guns in deck mounts, 1870 Model
     4 x Single mounts on centreline, aft deck forward
      4 raised mounts
       10 - 0.51" / 13.0 mm 45.0 cal guns - 0.07lbs / 0.03kg shells, 2 000 per gun
     Breech loading guns in deck mounts, 1870 Model
     2 x 5-Reffye gun mounts on sides amidships
      2 raised mounts
      Weight of broadside 4 446 lbs / 2 017 kg


Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   11.8" / 300 mm   196.85 ft / 60.00 m   7.87 ft / 2.40 m
   Ends:   7.87" / 200 mm     98.43 ft / 30.00 m   7.87 ft / 2.40 m
   Upper:   5.91" / 150 mm   196.85 ft / 60.00 m   11.81 ft / 3.60 m
     Main Belt covers 103 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.94" / 100 mm         -         7.87" / 200 mm
   2nd:   3.94" / 100 mm         -               -
   3rd:   1.97" / 50 mm         -               -
   4th:   0.39" / 10 mm         -               -
   5th:   0.39" / 10 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 1.57" / 40 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 7.87" / 200 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 4 657 ihp / 3 474 Kw = 14.00 kts
   Range 3 000nm at 7.00 kts
   Bunker at max displacement = 677 tons (100% coal)

Complement:
   393 - 511

Cost:
   £0.482 million / $1.926 million

Distribution of weights at normal displacement:
   Armament: 250 tons, 3.4 %
      - Guns: 250 tons, 3.4 %
   Armour: 2 161 tons, 29.8 %
      - Belts: 1 648 tons, 22.7 %
      - Armament: 124 tons, 1.7 %
      - Armour Deck: 327 tons, 4.5 %
      - Conning Tower: 64 tons, 0.9 %
   Machinery: 1 141 tons, 15.7 %
   Hull, fittings & equipment: 2 368 tons, 32.6 %
   Fuel, ammunition & stores: 724 tons, 10.0 %
   Miscellaneous weights: 620 tons, 8.5 %
      - Above deck: 620 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     7 396 lbs / 3 355 Kg = 16.8 x 10.8 " / 274 mm shells or 1.9 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 2.8 ft / 0.9 m
   Roll period: 14.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.68
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has low forecastle, low quarterdeck ,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.626 / 0.627
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 17.18 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): -30.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   16.00 %,  13.78 ft / 4.20 m,  11.81 ft / 3.60 m
      - Forward deck:   32.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Aft deck:   36.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Quarter deck:   16.00 %,  11.81 ft / 3.60 m,  11.81 ft / 3.60 m
      - Average freeboard:      14.61 ft / 4.45 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 65.6 %
      - Above water (accommodation/working, high = better): 88.6 %
   Waterplane Area: 11 614 Square feet or 1 079 Square metres
   Displacement factor (Displacement / loading): 122 %
   Structure weight / hull surface area: 131 lbs/sq ft or 640 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 3.09
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Cramped 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

saisl speed:17.18kts:2=8.59+3.5kts=12.09kts

[KWorld]

Centerline bow casemates, unless mounted below deck level (to signify they're in the bows) are going to have issues with the rigging on vessels that have sails.  They'll certainly be able to shoot, just not directly ahead, for fear of hitting the foremast or the bowsprit and taking down the forward rigging.

Ram is perhaps a bit short for actual use, a little more length would be no bad thing.


She's certainly more weatherly than the American Congress-class.  At a guess, I'd expect the gun layout along the sides to be 274 (with cutout to get more forward fire than normal) - 194 - 274 - 194 - 274 (with cutout to get more aft fire than normal).

[Jefgte]

That kind of disposition

-------------194---274--274--274---194---------
---274-M----------------M--------------------M-274-----
-------------194---274--274--274---194---------

M=> mast

[Jefgte]

Second class BB
Update from 6x240 to 8x240

BB-8x240+4x194, France BB laid down 1870

Displacement:
   4 920 t light; 5 182 t standard; 5 497 t normal; 5 749 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (285.43 ft / 278.87 ft) x 45.93 ft (Bulges 52.49 ft) x (21.34 / 22.26 ft)
   (87.00 m / 85.00 m) x 14.00 m (Bulges 16.00 m)  x (6.50 / 6.79 m)

Armament:
      2 - 9.45" / 240 mm 20.0 cal guns - 316.36lbs / 143.50kg shells, 75 per gun
     Breech loading guns in casemate mounts, 1870 Model
     2 x Single mounts on centreline ends, evenly spread
      6 - 9.45" / 240 mm 20.0 cal guns - 316.36lbs / 143.50kg shells, 75 per gun
     Breech loading guns in casemate mounts, 1870 Model
     6 x Single mounts on side ends, majority forward
      4 - 7.64" / 194 mm 20.0 cal guns - 167.09lbs / 75.79kg shells, 120 per gun
     Breech loading guns in casemate mounts, 1870 Model
     4 x Single mounts on sides, evenly spread
      4 - 1.85" / 47.0 mm 45.0 cal guns - 2.67lbs / 1.21kg shells, 150 per gun
     Breech loading guns in deck mounts, 1870 Model
     4 x Single mounts on centreline, aft deck forward
      4 raised mounts
      10 - 0.51" / 13.0 mm 45.0 cal guns Reffye- 0.07lbs / 0.03kg shells, 2 000 per gun
     Breech loading guns in deck mounts, 1870 Model
     2 x 5-gun mounts on sides amidships
      2 raised mounts
      Weight of broadside 3 211 lbs / 1 456 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.87" / 200 mm   180.45 ft / 55.00 m   7.87 ft / 2.40 m
   Ends:   5.91" / 150 mm     65.62 ft / 20.00 m   7.87 ft / 2.40 m
     32.81 ft / 10.00 m Unarmoured ends
   Upper:   5.91" / 150 mm   164.04 ft / 50.00 m   11.81 ft / 3.60 m
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.94" / 100 mm         -         7.87" / 200 mm
   2nd:   3.94" / 100 mm         -               -
   3rd:   1.97" / 50 mm         -               -
   4th:   0.39" / 10 mm         -               -
   5th:   0.39" / 10 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 1.38" / 35 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 7.87" / 200 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 3 959 ihp / 2 953 Kw = 14.00 kts
   Range 3 000nm at 7.00 kts
   Bunker at max displacement = 567 tons (100% coal)

Complement:
   318 - 414

Cost:
   £0.375 million / $1.501 million

Distribution of weights at normal displacement:
   Armament: 207 tons, 3.8 %
      - Guns: 207 tons, 3.8 %
   Armour: 1 517 tons, 27.6 %
      - Belts: 1 123 tons, 20.4 %
      - Armament: 109 tons, 2.0 %
      - Armour Deck: 233 tons, 4.2 %
      - Conning Tower: 53 tons, 1.0 %
   Machinery: 970 tons, 17.7 %
   Hull, fittings & equipment: 1 745 tons, 31.8 %
   Fuel, ammunition & stores: 577 tons, 10.5 %
   Miscellaneous weights: 480 tons, 8.7 %
      - Above deck: 480 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     4 847 lbs / 2 198 Kg = 16.4 x 9.4 " / 240 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 2.2 ft / 0.7 m
   Roll period: 15.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.66
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.616 / 0.617
   Length to Beam Ratio: 5.31 : 1
   'Natural speed' for length: 16.70 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): -30.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   16.00 %,  17.06 ft / 5.20 m,  17.06 ft / 5.20 m
      - Forward deck:   32.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Aft deck:   36.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Quarter deck:   16.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Average freeboard:      13.75 ft / 4.19 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 71.3 %
      - Above water (accommodation/working, high = better): 74.7 %
   Waterplane Area: 9 509 Square feet or 883 Square metres
   Displacement factor (Displacement / loading): 120 %
   Structure weight / hull surface area: 116 lbs/sq ft or 564 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 3.02
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Cramped 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

sails speed:16.7kts:2=8.35kts+3.7kts=12.05kts

[KWorld]

That kind of disposition

-------------194---274--274---194---------
---274-M------------M-----------------M-274-----
-------------194---274--274---194---------

M=> mast

You have 6 side-mounted 274's.  :)

[Jefgte]

 ;)

That kind of disposition

-------------194---274--274--274---194---------
---274-M----------------M--------------------M-274---
-------------194---274--274--274---194---------

M=> mast

[KWorld]

In that case, you may want to mark the 194s as being in side ends mountings.

[KWorld]

On the second-class BB, she has more upper beltarmor than she needs: with her main deck at 4m, 3.6m of upper belt pushes the main belt down so only .4m is above water at normal draft.  Interesting the difference between the first and second-class BBs in their 13mm armament.

[Jefgte]

BB-8x240+4x194, France BB laid down 1870

Displacement:
   4 765 t light; 5 023 t standard; 5 333 t normal; 5 581 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (285.43 ft / 278.87 ft) x 45.93 ft (Bulges 52.49 ft) x (20.70 / 21.61 ft)
   (87.00 m / 85.00 m) x 14.00 m (Bulges 16.00 m)  x (6.31 / 6.59 m)

Armament:
      2 - 9.45" / 240 mm 20.0 cal guns - 316.36lbs / 143.50kg shells, 75 per gun
     Breech loading guns in casemate mounts, 1870 Model
     2 x Single mounts on centreline ends, evenly spread
      6 - 9.45" / 240 mm 20.0 cal guns - 316.36lbs / 143.50kg shells, 75 per gun
     Breech loading guns in casemate mounts, 1870 Model
     6 x Single mounts on sides, evenly spread
      4 - 7.64" / 194 mm 20.0 cal guns - 167.09lbs / 75.79kg shells, 120 per gun
     Breech loading guns in casemate mounts, 1870 Model
     4 x Single mounts on side ends, evenly spread
      4 - 1.85" / 47.0 mm 45.0 cal guns - 2.67lbs / 1.21kg shells, 150 per gun
     Breech loading guns in deck mounts, 1870 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      10 - 0.51" / 13.0 mm 45.0 cal guns - 0.07lbs / 0.03kg shells, 2 000 per gun
     Breech loading guns in deck mounts, 1870 Model
     2 x 5-gun mounts on sides, forward deck aft
      2 raised mounts
      Weight of broadside 3 211 lbs / 1 456 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.87" / 200 mm   180.45 ft / 55.00 m   7.87 ft / 2.40 m
   Ends:   5.91" / 150 mm     65.62 ft / 20.00 m   7.87 ft / 2.40 m
     32.81 ft / 10.00 m Unarmoured ends
   Upper:   5.91" / 150 mm   164.04 ft / 50.00 m   9.19 ft / 2.80 m
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.94" / 100 mm         -         7.87" / 200 mm
   2nd:   3.94" / 100 mm         -               -
   3rd:   1.97" / 50 mm         -               -
   4th:   0.39" / 10 mm         -               -
   5th:   0.39" / 10 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 1.38" / 35 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 7.87" / 200 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 3 889 ihp / 2 901 Kw = 14.00 kts
   Range 3 000nm at 7.00 kts
   Bunker at max displacement = 558 tons (100% coal)

Complement:
   311 - 405

Cost:
   £0.368 million / $1.470 million

Distribution of weights at normal displacement:
   Armament: 207 tons, 3.9 %
      - Guns: 207 tons, 3.9 %
   Armour: 1 402 tons, 26.3 %
      - Belts: 1 009 tons, 18.9 %
      - Armament: 109 tons, 2.0 %
      - Armour Deck: 233 tons, 4.4 %
      - Conning Tower: 52 tons, 1.0 %
   Machinery: 953 tons, 17.9 %
   Hull, fittings & equipment: 1 737 tons, 32.6 %
   Fuel, ammunition & stores: 568 tons, 10.7 %
   Miscellaneous weights: 465 tons, 8.7 %
      - Above deck: 465 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     4 754 lbs / 2 157 Kg = 16.1 x 9.4 " / 240 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 2.2 ft / 0.7 m
   Roll period: 14.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.66
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.616 / 0.617
   Length to Beam Ratio: 5.31 : 1
   'Natural speed' for length: 16.70 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): -30.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   16.00 %,  17.06 ft / 5.20 m,  17.06 ft / 5.20 m
      - Forward deck:   32.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Aft deck:   36.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Quarter deck:   16.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
      - Average freeboard:      13.75 ft / 4.19 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 72.4 %
      - Above water (accommodation/working, high = better): 76.4 %
   Waterplane Area: 9 509 Square feet or 883 Square metres
   Displacement factor (Displacement / loading): 121 %
   Structure weight / hull surface area: 116 lbs/sq ft or 566 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.89
      - Longitudinal: 2.98
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Cramped 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

sails speed:16.7kts:2=8.35kts+3.7kts=12.05kts
13.0 mm are light naval De Reffye machine gun - 5 guns per mount

[KWorld]

Didn't the De Reffye mitrailleuse have 25 barrels per gun, not 5?  Other than that, looks solid.

[Jefgte]

Didn't the De Reffye mitrailleuse have 25 barrels per gun, not 5?  Other than that, looks solid.

Exactly, a gun with 25 barrels.

But:
1- This is an infantry machine gun, for the navy, 25 barrels are certainly too much.
2- How SS 25 guns per mount ?

Jef

[Jefgte]

2x240+8x194+4x47+10x13, France Canonnière Cuirassée laid down 1870

Displacement:
   2 555 t light; 2 723 t standard; 2 936 t normal; 3 105 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (242.78 ft / 236.22 ft) x 32.81 ft (Bulges 41.01 ft) x (16.94 / 17.97 ft)
   (74.00 m / 72.00 m) x 10.00 m (Bulges 12.50 m)  x (5.16 / 5.48 m)

Armament:
      2 - 9.45" / 240 mm 20.0 cal guns - 316.36lbs / 143.50kg shells, 80 per gun
     Breech loading guns in casemate mounts, 1870 Model
     2 x Single mounts on centreline ends, evenly spread
      8 - 7.64" / 194 mm 20.0 cal guns - 167.09lbs / 75.79kg shells, 108 per gun
     Breech loading guns in casemate mounts, 1870 Model
     8 x Single mounts on sides, evenly spread
      4 - 1.85" / 47.0 mm 45.0 cal guns - 2.67lbs / 1.21kg shells, 150 per gun
     Breech loading guns in deck mounts, 1870 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      10 - 0.51" / 13.0 mm 45.0 cal guns - 0.07lbs / 0.03kg shells, 2 000 per gun
     Breech loading guns in deck mounts, 1870 Model
     2 x Quintuple mounts on sides amidships
      2 raised mounts
      Weight of broadside 1 981 lbs / 898 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   5.91" / 150 mm   157.48 ft / 48.00 m   7.87 ft / 2.40 m
   Ends:   1.57" / 40 mm     39.37 ft / 12.00 m   7.22 ft / 2.20 m
     39.37 ft / 12.00 m Unarmoured ends
     Main Belt covers 103 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.94" / 100 mm         -         1.57" / 40 mm
   2nd:   1.57" / 40 mm         -         1.18" / 30 mm
   4th:   0.39" / 10 mm         -               -
   5th:   0.39" / 10 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 1.38" / 35 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 3.94" / 100 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 2 822 ihp / 2 105 Kw = 14.00 kts
   Range 3 000nm at 7.00 kts
   Bunker at max displacement = 382 tons (100% coal)

Complement:
   199 - 259

Cost:
   £0.228 million / $0.912 million

Distribution of weights at normal displacement:
   Armament: 129 tons, 4.4 %
      - Guns: 129 tons, 4.4 %
   Armour: 547 tons, 18.6 %
      - Belts: 330 tons, 11.2 %
      - Armament: 57 tons, 2.0 %
      - Armour Deck: 142 tons, 4.8 %
      - Conning Tower: 17 tons, 0.6 %
   Machinery: 692 tons, 23.6 %
   Hull, fittings & equipment: 912 tons, 31.1 %
   Fuel, ammunition & stores: 381 tons, 13.0 %
   Miscellaneous weights: 275 tons, 9.4 %
      - Above deck: 275 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1 963 lbs / 890 Kg = 6.6 x 9.4 " / 240 mm shells or 0.8 torpedoes
   Stability (Unstable if below 1.00): 1.28
   Metacentric height 1.5 ft / 0.4 m
   Roll period: 14.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 76 %
         - Recoil effect (Restricted arc if above 1.00): 0.63
   Seaboat quality  (Average = 1.00): 1.53

Hull form characteristics:
   Hull has low forecastle, low quarterdeck ,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.626 / 0.624
   Length to Beam Ratio: 5.76 : 1
   'Natural speed' for length: 15.37 kts
   Power going to wave formation at top speed: 48 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): -30.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   16.00 %,  9.19 ft / 2.80 m,  6.56 ft / 2.00 m
      - Forward deck:   32.00 %,  10.17 ft / 3.10 m,  10.17 ft / 3.10 m
      - Aft deck:   37.00 %,  10.17 ft / 3.10 m,  10.17 ft / 3.10 m
      - Quarter deck:   15.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Average freeboard:      9.22 ft / 2.81 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 92.9 %
      - Above water (accommodation/working, high = better): 56.5 %
   Waterplane Area: 5 807 Square feet or 539 Square metres
   Displacement factor (Displacement / loading): 113 %
   Structure weight / hull surface area: 96 lbs/sq ft or 471 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.42
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Cramped 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

Misc Weight: 9.5% - 280t
Natural speed is 15.37kts.
5% of the ship Normal Displacement (142t) give a speed of 15.37kts:2= 7.68kts.
Plus an additionnal of 4.4%
Speed under sails is 7.68+4.4=12.08kts

[KWorld]

Didn't the De Reffye mitrailleuse have 25 barrels per gun, not 5?  Other than that, looks solid.

Exactly, a gun with 25 barrels.

But:
1- This is an infantry machine gun, for the navy, 25 barrels are certainly too much.
2- How SS 25 guns per mount ?

Given the way the mitrailleuse wsa reloaded, you'd probably want more barrels than 5, since after 5 rounds you'd have to stop firing and reload.  I'd recommend going with as many barrels as SS allows, which I think is 10.

[KWorld]

On the Canonnière Cuirassée, looks solid enough. The lack of upper belt armor is a design choice that allows heavier main belt armor.  The former gives a target area for shells, but the latter makes it more difficult to punch holes that will actually sink the ship.