Montezuma, mexican gunboat laid down 1860
Displacement:
393 t light; 422 t standard; 467 t normal; 502 t full load
Dimensions: Length overall / water x beam x draught
130,17 ft / 117,19 ft x 23,49 ft x 10,60 ft (normal load)
39,68 m / 35,72 m x 7,16 m x 3,23 m
Armament:
1 - 10,00" / 254 mm guns in single mounts, 275,00lbs / 124,74kg shells, 1860 Model
Muzzle loading gun in deck mount
on centreline forward
Main guns limited to end-on fire
6 - 32pdr guns in single mounts, 1860 Model
Smoothbore guns in broadside mounts
on side, evenly spread
Weight of broadside 409 lbs / 186 kg
Shells per gun, main battery: 80
Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 1 shaft, 404 ihp / 302 Kw = 10,50 kts
Range 1 700nm at 6,00 kts
Bunker at max displacement = 80 tons (100% coal)
Complement:
81
Cost:
£0,070 million / $0,280 million
Distribution of weights at normal displacement:
Armament: 51 tons, 11,0%
Machinery: 95 tons, 20,2%
Hull, fittings & equipment: 248 tons, 53,1%
Fuel, ammunition & stores: 73 tons, 15,7%
Miscellaneous weights: 0 tons, 0,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
138 lbs / 62 Kg = 0,5 x 10,0 " / 254 mm shells or 0,1 torpedoes
Stability (Unstable if below 1.00): 1,25
Metacentric height 0,8 ft / 0,3 m
Roll period: 10,7 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 1,40
Seaboat quality (Average = 1.00): 2,00
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,560
Length to Beam Ratio: 4,99 : 1
'Natural speed' for length: 10,83 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 43,00 degrees
Stern overhang: 3,25 ft / 0,99 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 10,43 ft / 3,18 m
- Forecastle (20%): 9,06 ft / 2,76 m
- Mid (50%): 9,06 ft / 2,76 m
- Quarterdeck (15%): 9,06 ft / 2,76 m
- Stern: 9,55 ft / 2,91 m
- Average freeboard: 9,20 ft / 2,80 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 145,8%
- Above water (accommodation/working, high = better): 66,3%
Waterplane Area: 1 884 Square feet or 175 Square metres
Displacement factor (Displacement / loading): 70%
Structure weight / hull surface area: 69 lbs/sq ft or 336 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,79
- Longitudinal: 8,01
- Overall: 1,00
Hull space for machinery, storage, compartmentation is cramped
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
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