WesWorld

I did this as an experiment to fit into my Class C cruiser concept. It's not perfect, but it did turn out fairly well.

*****

MIBN Executor, Empire of Brazil Escort Cruiser laid down 1939

Displacement:
7,180 t light; 7,457 t standard; 7,980 t normal; 8,399 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(542.35 ft / 531.00 ft) x 60.70 ft x (18.36 / 19.06 ft)
(165.31 m / 161.85 m) x 18.50 m x (5.60 / 5.81 m)

Armament:
8 - 5.98" / 152 mm 50.0 cal guns - 120.00lbs / 54.43kg shells, 150 per gun
Breech loading guns in turret on barbette mounts , 1939 Model
4 x Twin mounts on centreline ends, evenly spread
2 raised mounts - superfiring
16 - 1.46" / 37.0 mm 45.0 cal guns - 2.00lbs / 0.91kg shells, 2,000 per gun
Anti-air guns in deck mounts , 1939 Model
8 x Twin mounts on sides, evenly spread
4 raised mounts
16 - 0.54" / 13.7 mm 45.0 cal guns - 0.08lbs / 0.04kg shells, 2,000 per gun
Machine guns in deck mounts , 1939 Model
16 x Single mounts on sides, evenly spread
16 raised mounts
Weight of broadside 993 lbs / 993 kg
8 - 21.0" / 533 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.35" / 110 mm 351.97 ft / 107.28 m 8.63 ft / 2.63 m
Ends: Unarmoured
Main Belt covers 102 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.00" / 102 mm 2.00" / 51 mm 4.00" / 102 mm

- Armour deck: 3.60" / 91 mm, Conning tower: 1.50" / 38 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 63,614 shp / 47,456 Kw = 30.50 kts
Range 8,100nm at 12.00 kts
Bunker at max displacement = 942 tons

Complement:
421 - 548

Cost:
£3.430 million / $13.720 million

Distribution of weights at normal displacement:
Armament: 236 tons, 3.0 %
Armour: 2,226 tons, 27.9 %
- Belts: 554 tons, 6.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 264 tons, 3.3 %
- Armour Deck: 1,395 tons, 17.5 %
- Conning Tower: 13 tons, 0.2 %
Machinery: 1,721 tons, 21.6 %
Hull, fittings & equipment: 3,118 tons, 39.1 %
Fuel, ammunition & stores: 800 tons, 10.0 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
11,293 lbs / 5,122 Kg = 105.4 x 6.0 " / 152 mm shells or 1.8 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 2.4 ft / 0.7 m
Roll period: 16.5 seconds
Steadiness - As gun platform (Average = 50 %): 82 %
- Recoil effect (Restricted arc if above 1.00): 0.38
Seaboat quality (Average = 1.00): 1.08

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.472 / 0.479
Length to Beam Ratio: 8.75 : 1
'Natural speed' for length: 23.04 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 76
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 17.00 %, 24.34 ft / 7.42 m, 17.70 ft / 5.39 m
- Forward deck: 50.00 %, 17.70 ft / 5.39 m, 17.70 ft / 5.39 m
- Aft deck: 16.00 %, 17.70 ft / 5.39 m, 17.70 ft / 5.39 m
- Quarter deck: 17.00 %, 17.70 ft / 5.39 m, 17.70 ft / 5.39 m
- Average freeboard: 18.15 ft / 5.53 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 82.4 %
- Above water (accommodation/working, high = better): 139.1 %
Waterplane Area: 20,946 Square feet or 1,946 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 97 lbs/sq ft or 474 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.41
- 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

You'll probably need something in the way of secondary armament. Maybe a few 75mm or 100mm guns to serve as heavy AA.

Deck armour seems rather excessive. It means you're proof against 8" gunfire out to 30,000yds at which range the 6" guns can't fire to and hitting is extremely doubtful.

Her BC is way too low and as RA already said: she lacks a secondary battery.

I´d ditch some armor ....

....and add more speed too while we´re at it.

It may just be me, but I think that Executor would be a better name for a Super-Cruiser.

Other than that, she seems very poor compared to ships already in service, or in build. And why such heavy deck armour?

Quoted

Her BC is way too low

Maybe so, but it is higher than the Italian Saint Class with a BC of 0.45. Hell even the Pisa Class has a lower BC (just at 0.47) and that one carries quad main guns with the same caliber as the MIBN Executor.

A few others with lower BC...
DeGrasse Class (France) = 0.44
Leipzig Class (Germany) = 0.45
Avada Kedavra Class (Iberia) = 0.465


And how about ...
Sviatoslav class heavy cruisers (Russia) = 0.43
Northampton Class heavy cruiser (USA) = 0.436
Ranger CVL (USA) = 0.439
Constellation CVL (USA) = 0.457

Now if you think that the BC on the MIBN Executor is too low, then I would think that you will consider the BCs on those ships to be too low as well.

Quoted

It may just be me, but I think that Executor would be a better name for a Super-Cruiser.

I think that name is better suited for a Super Star Destroyer.

I do.

(And gladly you mentioned no RSAN units.... )

well, I only looked at ships of similar or greater displacement. None of the RSAN ships I spotted in that category appeared to have a BC smaler than 0.50 so there is no need to mention them.

She's meant to be something of a floating AA battery, hence the lack of 90mm guns in favor of having twice the AA armament of the Saggie and the DP main guns. She's also meant to be more expendable than the Saggie, which is more of a CLA than a true light cruiser.

And people keep commented on the level of armour for my cruisers and I keep not changing the practice. The reason for it is simple; I can't afford many cruisers, so the ones I can need to be very tough hombres.

Quoted

The reason for it is simple; I can't afford many cruisers, so the ones I can need to be very tough hombres.

...they really need higher stability, or else they risk capsizing from slight damage below the waterline.

Agreed! IIRC, we once said everything under 1.03 must be considered in serious risk of turning turtle in case of of center flooding....

Quoted

And people keep commented on the level of armour for my cruisers and I keep not changing the practice. The reason for it is simple; I can't afford many cruisers, so the ones I can need to be very tough hombres.

Unless you're expecting to fight battleships with this light cruiser, or be dive bombed with 1500lb bombs regularly, the current deck armour can be considerably thinned and still afford protection.

If she is meant to be an AA ship, I'd increase the light AA battery considerably.

Quoted

Originally posted by HoOmAn
Agreed! IIRC, we once said everything under 1.03 must be considered in serious risk of turning turtle in case of of center flooding....

And yet the Executor has a seaboat rating of 1.08.

Quoted

Originally posted by Red Admiral
Unless you're expecting to fight battleships with this light cruiser, or be dive bombed with 1500lb bombs regularly, the current deck armour can be considerably thinned and still afford protection.

Actually, I am. Since my most likely enemy has more capital ships than I have cruisers, it makes sense to armour them as heavily as possible. As it is, you're seriously underestimating the deck penetration that's possible with even the Exec's guns, BigGun rates them as having a deck penetration of 3.35 inches with max elevation (45 degrees) at 25,900 yards.

Quoted

If she is meant to be an AA ship, I'd increase the light AA battery considerably.

I'll look into it.

Quoted

Originally posted by Fyrwulf

Quoted

Originally posted by HoOmAn
Agreed! IIRC, we once said everything under 1.03 must be considered in serious risk of turning turtle in case of of center flooding....

And yet the Executor has a seaboat rating of 1.08.

Not seaboat rating, stability. Right now the design's stability is 1.00, which means it's stability is marginal, at best. If you take off-center flooding, and that's how most flooding will be, you'll have to counterflood immediately or suffer serious listing leading to capsizing.

How would you suggest I improve stability, then? It's not very helpful to state that something needs improving without suggesting how to do it.

Solving it should be extremely obvious...

Quoted

Steadiness - As gun platform (Average = 50 %): 82 %

and

Quoted

Trim (Max stability = 0, Max steadiness = 100): 76

Lower trim so your steadiness is 70%. That should get stability above 1.05.

Lets remember folks, this is all freindly critisism. I sence wee bit of frustration.

Quoted

As it is, you're seriously underestimating the deck penetration that's possible with even the Exec's guns, BigGun rates them as having a deck penetration of 3.35 inches with max elevation (45 degrees) at 25,900 yards.

The problem is that at that range you're looking a hit percentage of around 0.5% from a 6" gun. Bringing the range down to a closer 19000yds (70% of max) and this'll up a bit to 3% max, but is still extremely low. For fighting at longer ranges, larger guns are better.

Quoted

Originally posted by Red Admiral
The problem is that at that range you're looking a hit percentage of around 0.5% from a 6" gun. Bringing the range down to a closer 19000yds (70% of max) and this'll up a bit to 3% max, but is still extremely low. For fighting at longer ranges, larger guns are better.

Of course, but that's six or seven penetrating hits through the deck of a light cruiser assuming it's just two cruisers duking it out at max range. Bring that in to 70% of max range and it goes way up with 36 to forty hits through the deck. A light cruiser will probably survive six or seven hits, but six times as many hits will gut the same cruiser. Of course, that's assuming the deck isn't adequately armoured; if it is, then there's no problem.

So many hits will destroy your cruiser anyway. Even if the armored deck is not penetrated everything else will be ruined and burning....