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Keisser
Post subject: AU light cruiserPosted: July 13th, 2016, 8:42 am
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After period of meditation I return to Shipbucket with a wish to learn to produce qualitative drawings.
So, here is my light cruiser.
[ img ]
Aaron Gleaves, Western Union light cruiser laid down 1925

Displacement:
4 006 t light; 4 140 t standard; 4 647 t normal; 5 052 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(444,88 ft / 423,23 ft) x 55,77 ft x (22,97 / 23,99 ft)
(135,60 m / 129,00 m) x 17,00 m x (7,00 / 7,31 m)

Armament:
8 - 5,00" / 127 mm 50,0 cal guns - 66,16lbs / 30,01kg shells, 125 per gun
Dual purpose guns in turret on barbette mounts, 1925 Model
2 x Twin mounts on centreline, aft deck aft
1 raised mount aft - superfiring
2 x Twin mounts on centreline, forward deck forward
1 raised mount - superfiring
12 - 1,58" / 40,1 mm 50,0 cal guns - 2,09lbs / 0,95kg shells, 250 per gun
Anti-air guns in deck mounts, 1925 Model
1 x Quad mount on centreline, aft deck aft
1 raised mount - superfiring
2 x Quad mounts on centreline ends, evenly spread
1 double raised mount - superfiring
12 - 1,00" / 25,4 mm 45,0 cal guns - 0,51lbs / 0,23kg shells, 300 per gun
Anti-air guns in deck mounts, 1925 Model
2 x Twin mounts on sides, aft deck aft
4 x Twin mounts on sides, forward deck forward
4 raised mounts
Weight of broadside 561 lbs / 254 kg
Main Torpedoes
16 - 21,0" / 533 mm, 25,00 ft / 7,62 m torpedoes - 1,619 t each, 25,898 t total
In 4 sets of deck mounted side rotating tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4,00" / 102 mm 175,52 ft / 53,50 m 6,89 ft / 2,10 m
Ends: 1,42" / 36 mm 164,04 ft / 50,00 m 9,84 ft / 3,00 m
83,66 ft / 25,50 m Unarmoured ends
Main Belt covers 64% of normal length
Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5,00" / 127 mm 3,50" / 89 mm 3,00" / 76 mm
2nd: 1,00" / 25 mm - -
3rd: 1,00" / 25 mm - -

- Armoured deck - multiple decks:
For and Aft decks: 1,54" / 39 mm
Forecastle: 1,54" / 39 mm Quarter deck: 1,54" / 39 mm

- Conning towers: Forward 5,00" / 127 mm, Aft 5,00" / 127 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 30 960 shp / 23 096 Kw = 27,50 kts
Range 8 000nm at 13,00 kts
Bunker at max displacement = 912 tons

Complement:
280 - 365

Cost:
£1,110 million / $4,441 million

Distribution of weights at normal displacement:
Armament: 204 tons, 4,4%
- Guns: 152 tons, 3,3%
- Weapons: 52 tons, 1,1%
Armour: 923 tons, 19,9%
- Belts: 309 tons, 6,7%
- Armament: 157 tons, 3,4%
- Armour Deck: 397 tons, 8,5%
- Conning Towers: 60 tons, 1,3%
Machinery: 1 005 tons, 21,6%
Hull, fittings & equipment: 1 859 tons, 40,0%
Fuel, ammunition & stores: 641 tons, 13,8%
Miscellaneous weights: 15 tons, 0,3%
- On freeboard deck: 15 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
5 625 lbs / 2 552 Kg = 90,0 x 5,0 " / 127 mm shells or 1,2 torpedoes
Stability (Unstable if below 1.00): 1,13
Metacentric height 2,6 ft / 0,8 m
Roll period: 14,5 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0,19
Seaboat quality (Average = 1.00): 1,00

Hull form characteristics:
Hull has raised forecastle, rise aft of midbreak,
a straight bulbous bow and a cruiser stern
Block coefficient (normal/deep): 0,300 / 0,312
Length to Beam Ratio: 7,59 : 1
'Natural speed' for length: 20,57 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 45,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 29,00%, 21,65 ft / 6,60 m, 10,33 ft / 3,15 m
- Forward deck: 0,00%, 0,00 ft / 0,00 m, 0,00 ft / 0,00 m
- Aft deck: 61,00%, 10,33 ft / 3,15 m, 10,33 ft / 3,15 m
- Quarter deck: 10,00%, 10,33 ft / 3,15 m, 14,76 ft / 4,50 m
- Average freeboard: 11,87 ft / 3,62 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 82,3%
- Above water (accommodation/working, high = better): 92,9%
Waterplane Area: 13 867 Square feet or 1 288 Square metres
Displacement factor (Displacement / loading): 133%
Structure weight / hull surface area: 92 lbs/sq ft or 447 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,93
- Longitudinal: 1,93
- Overall: 1,00
Excellent machinery, storage, compartmentation space
Adequate accommodation and workspace room
RIP "C" turret...

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«A sea is not a barrier, a sea is a road, and those who try to use the sea as an instrument of isolation soon realize their foe has already put the sea into his own service.». - Alfred Thayer Mahan.


Last edited by Keisser on July 14th, 2016, 6:44 am, edited 4 times in total.

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eltf177
Post subject: Re: AU light cruiserPosted: July 13th, 2016, 9:40 am
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Sleek and dangerous!

Several comments:

- 10-inch CT armor? Way excessive, cut that down.
- Get rid of the TDS, useless on a ship of this size.

This should allow for a few fixes like the poor seakeeping...


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Keisser
Post subject: Re: AU light cruiserPosted: July 13th, 2016, 11:28 am
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I updated SprSh report. No more torpedo bulkheads, reduced CT armor from 10" to 5". However, the seakeeping is still insufficiet. I think this is because of low freeboard, damn.

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«A sea is not a barrier, a sea is a road, and those who try to use the sea as an instrument of isolation soon realize their foe has already put the sea into his own service.». - Alfred Thayer Mahan.


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heuhen
Post subject: Re: AU light cruiserPosted: July 13th, 2016, 2:28 pm
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well you are trying to do an cruiser on a destroyer size vessel... remove one turret, and since she is an light cruiser, only armor around the most vital area.... box around the engine and magazine


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citizen lambda
Post subject: Re: AU light cruiserPosted: July 13th, 2016, 2:33 pm
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The drawing doesn't look too bad, even though I don't know at a glance how much of it is original.
From a design standpoint, two weird details stand out to my era-untrained eyes:
1) What is that stern shape about? Did this happen on IRL ships? If not, what is it for, and how do you intend it to be built? If yes, just... why?
2) Aren't the windows on the bridge a bit too large for a ship of that era and role? Particularly compared with what I assume are vision slits in the rear backup conning tower? If what I call bridge is the same forward conning tower you assign 5" of armor to, wouldn't large square windows create weaknesses when compared to slits or portholes?

Just my $0.02, you'll have to wait for members more knowledgeable on that design era for more in-depth analysis.

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Keisser
Post subject: Re: AU light cruiserPosted: July 13th, 2016, 3:05 pm
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I've managed to made it without cutting one turret. 3,5" belt instead of 5", redusing speed to 27 knots (thogh raising cruising speed to 13 kts) and seakeeping is now well.
SprSh report will be updated in couple of minutes.
Citizen lambda,
About the stern: here is the image, that was the base of my drawing:
[ img ]
Also I've seen such one on AU Bolivar-class by Redhorse, Darth Panda and KIKE92.
Drawing will be updated among with report.

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«A sea is not a barrier, a sea is a road, and those who try to use the sea as an instrument of isolation soon realize their foe has already put the sea into his own service.». - Alfred Thayer Mahan.


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Novice
Post subject: Re: AU light cruiserPosted: July 13th, 2016, 9:25 pm
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Too much has been attempted on such a small hull. I'm no expert, but I think the gun mounting in the middle, just behind the funnel, will greatly interfere with the engine room. As you have taken the USS Erie hull as a base for your ship, and provided us with that incredibly large image of her damage report, I suggest you have a look what is behind the funnel on the real life ship. These guns which look to be 5"/38 guns in base ring mountings, have a lot of space under the deck for hoists and ammo, and that will leave no room for the engine room.
Style wise I think the aircraft on the catapult is too small, and is more like a drone in size than a manned aircraft.

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Keisser
Post subject: Re: AU light cruiserPosted: July 14th, 2016, 6:09 am
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Okay, I will remove the middle turret.
About the aircraft, I took it from Planebucket thread - this biplane was the most suitable one.

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«A sea is not a barrier, a sea is a road, and those who try to use the sea as an instrument of isolation soon realize their foe has already put the sea into his own service.». - Alfred Thayer Mahan.


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Shigure
Post subject: Re: AU light cruiserPosted: July 15th, 2016, 11:43 am
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Joined: May 25th, 2016, 2:05 pm
This looks really great! Well done, man!

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Keisser
Post subject: Re: AU light cruiserPosted: July 15th, 2016, 11:55 am
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Thanks)

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