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1

Sunday, July 30th 2006, 10:12am

Mendoza Modification for 1932

It is hoped that the sixth and last Mendoza will complete as the trial ship for the new 115mm DP twin mount now under development. Intended for the 1933 Destroyer Class it is hoped that by Q4 1932 three mounts will be complete for sea trials aboard this ship when she commissions in Q1 1933. Range has been increased as has misc weight to sim heavier mounts and some DCs. No sonar will be fitted. Should only two mounts be ready a new sextuple 20mmm mount will replace the midships mount.

Mendoza No 6 (Cordoba), Argentina Destroyer laid down 1932

Displacement:
1,737 t light; 1,834 t standard; 2,030 t normal; 2,187 t full load

Dimensions: Length overall / water x beam x draught
369.19 ft / 361.55 ft x 33.79 ft x 13.78 ft (normal load)
112.53 m / 110.20 m x 10.30 m x 4.20 m

Armament:
6 - 4.53" / 115 mm guns (3x2 guns), 55.12lbs / 25.00kg shells, 1932 Model
Breech loading guns in deck mounts with hoists
on centreline, evenly spread, 1 raised mount
Aft Main mounts separated by engine room
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
Weight of broadside 335 lbs / 152 kg
Shells per gun, main battery: 300
4 - 23.6" / 600 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.98" / 25 mm 1.97" / 50 mm
2nd: 0.39" / 10 mm - -
3rd: 0.47" / 12 mm - -

- Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 40,800 shp / 30,437 Kw = 34.02 kts
Range 4,200nm at 15.00 kts
Bunker at max displacement = 353 tons

Complement:
150 - 196

Cost:
£1.048 million / $4.193 million

Distribution of weights at normal displacement:
Armament: 35 tons, 1.7 %
Armour: 35 tons, 1.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 25 tons, 1.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 10 tons, 0.5 %
Machinery: 1,001 tons, 49.3 %
Hull, fittings & equipment: 621 tons, 30.6 %
Fuel, ammunition & stores: 293 tons, 14.4 %
Miscellaneous weights: 45 tons, 2.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
579 lbs / 263 Kg = 12.5 x 4.5 " / 115 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.29
Metacentric height 1.6 ft / 0.5 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.56
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.422
Length to Beam Ratio: 10.70 : 1
'Natural speed' for length: 21.80 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (20 %): 20.34 ft / 6.20 m
- Mid (52 %): 20.34 ft / 6.20 m (10.50 ft / 3.20 m aft of break)
- Quarterdeck (15 %): 10.50 ft / 3.20 m
- Stern: 10.50 ft / 3.20 m
- Average freeboard: 15.67 ft / 4.78 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 176.7 %
- Above water (accommodation/working, high = better): 110.3 %
Waterplane Area: 7,919 Square feet or 736 Square metres
Displacement factor (Displacement / loading): 73 %
Structure weight / hull surface area: 37 lbs/sq ft or 182 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.26
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate


2

Sunday, July 30th 2006, 10:19am

Very nice, certainly it will be interesting to see how this ship compares to her sisters.

3

Sunday, October 29th 2006, 4:25pm

Here is the final spec to which the Cordoba will complete. Another standard Mendoza will be built next year. She has the new 115mm DP mount and fire-control system.



Mendoza No 6 (Cordoba), Argentina Destroyer laid down 1932

Displacement:
1,736 t light; 1,834 t standard; 2,030 t normal; 2,187 t full load

Dimensions: Length overall / water x beam x draught
369.19 ft / 361.55 ft x 33.79 ft x 13.78 ft (normal load)
112.53 m / 110.20 m x 10.30 m x 4.20 m

Armament:
6 - 4.53" / 115 mm guns (3x2 guns), 55.12lbs / 25.00kg shells, 1932 Model
Breech loading guns in deck mounts with hoists
on centreline, evenly spread, 1 raised mount
Aft Main mounts separated by engine room
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
6 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 338 lbs / 153 kg
Shells per gun, main battery: 300
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.98" / 25 mm 1.97" / 50 mm
2nd: 0.39" / 10 mm - -
3rd: 0.47" / 12 mm - -

- Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 40,800 shp / 30,437 Kw = 34.02 kts
Range 4,200nm at 15.00 kts
Bunker at max displacement = 353 tons

Complement:
150 - 196

Cost:
£1.049 million / $4.197 million

Distribution of weights at normal displacement:
Armament: 36 tons, 1.8 %
Armour: 35 tons, 1.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 26 tons, 1.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 10 tons, 0.5 %
Machinery: 1,000 tons, 49.3 %
Hull, fittings & equipment: 620 tons, 30.5 %
Fuel, ammunition & stores: 294 tons, 14.5 %
Miscellaneous weights: 45 tons, 2.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
575 lbs / 261 Kg = 12.4 x 4.5 " / 115 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.28
Metacentric height 1.5 ft / 0.5 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.57
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.422
Length to Beam Ratio: 10.70 : 1
'Natural speed' for length: 21.80 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (20 %): 20.34 ft / 6.20 m
- Mid (52 %): 20.34 ft / 6.20 m (10.50 ft / 3.20 m aft of break)
- Quarterdeck (15 %): 10.50 ft / 3.20 m
- Stern: 10.50 ft / 3.20 m
- Average freeboard: 15.67 ft / 4.78 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 176.7 %
- Above water (accommodation/working, high = better): 84.7 %
Waterplane Area: 7,919 Square feet or 736 Square metres
Displacement factor (Displacement / loading): 73 %
Structure weight / hull surface area: 37 lbs/sq ft or 182 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.25
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

4

Sunday, October 29th 2006, 4:36pm

Definitely needs wider turrets. They don't appear to be on the centreline either.

Mounting 3 FC directors is unrealistic. Destroyers usually just had one. Topweight is the main problem.

5

Sunday, October 29th 2006, 5:14pm

Ok, I've changed the picture. Bigger turrets and now an even number of pixels wide. One less director too.

HoOmAn

Keeper of the Sacred Block Coefficient

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6

Monday, October 30th 2006, 10:42am

The smaller M-class clones presented in another thread seem to be the better choice to me. What does this design offer the smaller cannot?

7

Monday, October 30th 2006, 8:11pm

The need to test the 115mm DP turret at sea requires a new build ship so it was decided to convert the sixth Mendoza. This gives a year sea-time to work out the bugs. The old 950ton DD could not be used. She will later become the Flotilla Leader of the first 1933 Class Project 412 group. Of course if needs must 130mm guns can be fitted.