Egyptian Design Studies 1918

[ciders]

Project of Riverine Monitor, without mortars but with light field artillery to counter Beduins and ennemies cavalry raids.

...

Alpha, Egypt Riverine Monitor laid down 1918 (Engine 1905)

Displacement:
   546 t light; 561 t standard; 599 t normal; 630 t full load

Dimensions: Length overall / water x beam x draught
   196,85 ft / 196,85 ft x 39,37 ft x 4,92 ft (normal load)
   60,00 m / 60,00 m x 12,00 m  x 1,50 m

Armament:
      2 - 3,00" / 76,2 mm guns in single mounts, 13,50lbs / 6,12kg shells, 1905 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread
      4 - 0,98" / 25,0 mm guns in single mounts, 0,48lbs / 0,22kg shells, 1905 Model
     Breech loading guns in deck mounts
     on centreline, evenly spread
      4 - 0,50" / 12,7 mm guns in single mounts, 0,06lbs / 0,03kg shells, 1905 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 29 lbs / 13 kg
   Shells per gun, main battery: 150

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   0,79" / 20 mm   131,23 ft / 40,00 m   4,92 ft / 1,50 m
   Ends:   0,39" / 10 mm     32,81 ft / 10,00 m   3,28 ft / 1,00 m
     32,81 ft / 10,00 m Unarmoured ends
     Main Belt covers 103 % of normal length

   - Armour deck: 0,39" / 10 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 577 shp / 430 Kw = 12,00 kts
   Range 1 100nm at 10,00 kts
   Bunker at max displacement = 69 tons (100% coal)

Complement:
   59 - 78

Cost:
   £0,058 million / $0,231 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 0,6 %
   Armour: 64 tons, 10,6 %
      - Belts: 24 tons, 4,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 0 tons, 0,0 %
      - Armour Deck: 39 tons, 6,6 %
      - Conning Tower: 0 tons, 0,0 %
   Machinery: 48 tons, 8,0 %
   Hull, fittings & equipment: 401 tons, 66,9 %
   Fuel, ammunition & stores: 53 tons, 8,8 %
   Miscellaneous weights: 30 tons, 5,0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3 122 lbs / 1 416 Kg = 231,3 x 3,0 " / 76 mm shells or 2,1 torpedoes
   Stability (Unstable if below 1.00): 1,24
   Metacentric height 1,8 ft / 0,6 m
   Roll period: 12,3 seconds
   Steadiness   - As gun platform (Average = 50 %): 86 %
         - Recoil effect (Restricted arc if above 1.00): 0,02
   Seaboat quality  (Average = 1.00): 1,49

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,550
   Length to Beam Ratio: 5,00 : 1
   'Natural speed' for length: 14,03 kts
   Power going to wave formation at top speed: 37 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   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:      15,42 ft / 4,70 m
      - Forecastle (20 %):   9,81 ft / 2,99 m
      - Mid (50 %):      9,81 ft / 2,99 m
      - Quarterdeck (15 %):   9,81 ft / 2,99 m
      - Stern:      9,81 ft / 2,99 m
      - Average freeboard:   10,26 ft / 3,13 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 37,7 %
      - Above water (accommodation/working, high = better): 171,3 %
   Waterplane Area: 5 409 Square feet or 502 Square metres
   Displacement factor (Displacement / loading): 274 %
   Structure weight / hull surface area: 59 lbs/sq ft or 286 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1,41
      - Longitudinal: 3,36
      - Overall: 1,54
   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
   Good seaboat, rides out heavy weather easily

[TexanCowboy]

You could get a LOT more out of that. Maybe increase the speed a little and add more guns, maybe a few heavies.

[ciders]

It's a river monitor, not a blocus enforcer. :D

For the heavy guns, I think I can use 37 mm ( like Hotchkiss Model 1916 ).

[TexanCowboy]

Still, maybe you could add a few more knots, or even better, add a few companies of transport capacity. And if thats aimed againist the Zionists, their gunboats are half of the size of yours and mount more guns.

[ciders]

The ships of New Zion ? No, they can't attack my monitors. For a good reason : it's not possible to sail from the actual Uganda to Khartoum.

[TexanCowboy]

Still, very underperforming.

[ciders]

I agree. It's a monitor and Egyptian technology is weak, so I preferred to insist on the armour rather than on the engine.

[TexanCowboy]

The thing is, you could put a lot more armour on that ship then you have.

[ciders]

Yep. But it's only a first try.

So, more guns, more armour, more motorisation. Another ideas ?  :D

EDIT :

Third try, with Sachmle's help :

...

Au pire on ne les achètera pas, s'ils n'existent pas!

[TexanCowboy]

Much better. You could possibly increase the speed a little, but still, a much better ship.

[Sachmle]

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1,57" / 40 mm   131,23 ft / 40,00 m   4,92 ft / 1,50 m
   Ends:   0,98" / 25 mm     32,81 ft / 10,00 m   3,28 ft / 1,00 m
     32,81 ft / 10,00 m Unarmoured ends
   Upper:   0,98" / 25 mm     0,00 ft / 0,00 m   0,00 ft / 0,00 m
     Main Belt covers 103 % of normal length

I'd fix that first, then see what's left over. If there is any, you may want to lengthen the end belts.

[ciders]

Oops, what a nice forget... but not for Egyptian crews. :P