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Shigure
Post subject: Treaty Cruiser Design ChallengePosted: March 23rd, 2018, 1:18 pm
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Here are the results! Congrats Maomatic! You got first place :shock:

[ img ]

https://docs.google.com/spreadsheets/d/ ... sp=sharing

---------------------------------Original Post------------------------------------------------
Hello everyone.

With the conclusion of Regia's cruiser submarine challenge, I have decided the start another. This one is rather simple, you'll need to design a cruiser under the limits of the Washington Naval Treaty.

-The vessel must be a cruiser displacing either EXACTLY or LESS than 10k tonnes standard and cannot have a main gun calibre exceeding 203mm.
-A SpringSharp report is recommended. If you are unfamiliar with how to use SpringSharp you can get someone to make a report for you. This is done in order to see whether or not you are cheating. The 10k tonnage limit is strict! Not one ton over the limit, or you are disqualified.
-You may make as many entries as you wish.
-Entries close on 30 April, the winner will be decided that day.

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Last edited by Shigure on May 3rd, 2018, 5:24 pm, edited 4 times in total.

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Karle94
Post subject: Re: Treaty Cruiser Design ChallengePosted: March 23rd, 2018, 3:30 pm
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I'll post an oldie, but goldie. Fits both the WNT and the LNT I/II.

Seeing the aparrent lack of light cruisers between the Omaha and the Brooklyn, I decided to make a light cruiser inspired by a picture I found of the starting point for the Brooklyn class. It has 12 6 inch guns in 4 triple turrets, and interestingly enough, 4 dual 5 inch turrets. On my drawing I used the ones I drew for my American entry into the 25.000 ton BB/BC "competition." The turret is based on the turrets I have seen on early 30s design battleships, you can find them in Friedman's US Battleships.

The Phoenix is the same size as the Brooklyn, 185 meters long and 18 meters wide. Top speed is 33 kts, range is 10000 nm at 10 kts. Armor is also very similar to the Brooklyn, armor belt is 5 inches thick. The turrets are 6 inches at the front, 2 inches on the sides and the rear, the barbettes are 6 inches thick. The conning tower is 5 inches thick. The armor belt covers all the front turrets, and the #3 turret aft. The armor belt goes as deep as the knuckle, so I guess it kinda blends in with it, if that is even possible. Overall it looks alot like the New Orleans class.

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USS Phoenix, United States of America, Light Cruiser, laid down in 1932

Displacement:
9 011 t light; 10 000 t standard; 11 100 t normal; 11 609 t full load

Dimensions: Length overall / water x beam x draught
606,00 ft / 595,50 ft x 62,00 ft x 27,00 ft (normal load)
184,71 m / 181,51 m x 18,90 m x 8,23 m

Armament:
12 - 6,00" / 152 mm guns (4x3 guns), 108,00lbs / 48,99kg shells, 1932 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 5,00" / 127 mm guns (4x2 guns), 62,50lbs / 28,35kg shells, 1932 Model
Breech loading guns in deck mounts with hoists
on side, all amidships
4 - 0,50" / 12,7 mm guns in single mounts, 0,06lbs / 0,03kg shells, 1932 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 1 796 lbs / 815 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5,00" / 127 mm 390,00 ft / 118,87 m 20,00 ft / 6,10 m
Ends: Unarmoured
Main Belt covers 101 % of normal length
Main belt does not fully cover magazines and engineering spaces

- Torpedo Bulkhead:
2,00" / 51 mm 321,50 ft / 97,99 m 10,00 ft / 3,05 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 6,00" / 152 mm 2,00" / 51 mm 6,00" / 152 mm

- Armour deck: 2,00" / 51 mm, Conning tower: 5,00" / 127 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 104 456 shp / 77 924 Kw = 33,00 kts
Range 10 000nm at 10,00 kts
Bunker at max displacement = 1 146 tons

Complement:
576 - 749

Cost:
£4,571 million / $18,284 million

Distribution of weights at normal displacement:
Armament: 225 tons, 1,9 %
Armour: 3 257 tons, 26,9 %
- Belts: 1 620 tons, 13,4 %
- Torpedo bulkhead: 238 tons, 2,0 %
- Armament: 488 tons, 4,0 %
- Armour Deck: 855 tons, 7,1 %
- Conning Tower: 57 tons, 0,5 %
Machinery: 3 083 tons, 25,5 %
Hull, fittings & equipment: 4 446 tons, 36,7 %
Fuel, ammunition & stores: 1 089 tons, 9,0 %
Miscellaneous weights: 0 tons, 0,0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13 011 lbs / 5 902 Kg = 120,5 x 6,0 " / 152 mm shells or 1,9 torpedoes
Stability (Unstable if below 1.00): 1,11
Metacentric height 3,0 ft / 0,9 m
Roll period: 15,0 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0,39
Seaboat quality (Average = 1.00): 1,03

Hull form characteristics:
Hull has raised forecastle, rise forward of midbreak, low quarterdeck
Block coefficient: 0,425
Length to Beam Ratio: 9,60 : 1
'Natural speed' for length: 24,40 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 16,08 degrees
Stern overhang: 2,00 ft / 0,61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 29,50 ft / 8,99 m
- Forecastle (20 %): 26,00 ft / 7,92 m (24,00 ft / 7,32 m aft of break)
- Mid (50 %): 22,50 ft / 6,86 m (13,50 ft / 4,11 m aft of break)
- Quarterdeck (15 %): 13,50 ft / 4,11 m (14,50 ft / 4,42 m before break)
- Stern: 15,00 ft / 4,57 m
- Average freeboard: 19,49 ft / 5,94 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 144,6 %
- Above water (accommodation/working, high = better): 139,5 %
Waterplane Area: 23 097 Square feet or 2 146 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 111 lbs/sq ft or 544 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,95
- Longitudinal: 1,56
- Overall: 1,00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent


Last edited by Karle94 on March 25th, 2018, 2:25 pm, edited 1 time in total.

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Shigure
Post subject: Re: Treaty Cruiser Design ChallengePosted: March 23rd, 2018, 5:22 pm
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Nice! I like it

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JSB
Post subject: Re: Treaty Cruiser Design ChallengePosted: March 24th, 2018, 2:21 am
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filler not completed


Last edited by JSB on April 30th, 2018, 9:24 pm, edited 3 times in total.

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Kannevets
Post subject: Re: Treaty Cruiser Design ChallengePosted: March 24th, 2018, 2:57 am
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Joined: May 30th, 2017, 1:38 pm
Not gonna make it in, removed post

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Last edited by Kannevets on April 29th, 2018, 11:29 pm, edited 1 time in total.

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Colosseum
Post subject: Re: Treaty Cruiser Design ChallengePosted: March 24th, 2018, 5:32 am
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Yes, more placeholders please as drawings are difficult and springsharp reports are not :)

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Krakatoa
Post subject: Re: Treaty Cruiser Design ChallengePosted: March 24th, 2018, 9:22 am
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Shigure - please remember that Springsharp is a very flawed program - Do not rely on it for anything.


My entry is a set of drawings for Alternate British County class cruisers depicting both as it was completed and with refits to the start of WW2.

[ img ]

[ img ]

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If somebody wants to play with Springsharp and print a report, go to it.


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Hood
Post subject: Re: Treaty Cruiser Design ChallengePosted: March 24th, 2018, 10:35 am
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Joined: July 31st, 2010, 10:07 am
Yes, getting a good Springsharp report requires nearly as much skill as a good Shipbucket drawing!

I can already see a few issues with Kannevets' SS report, not least the overall hull strength of 1.27. Ideally you should aim for 1.00 and if you've got that much excess strength then you've probably got too much hull or not enough realistic weight. I'm not sure the layout of the 32 5in guns makes sense either from the report.

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Gollevainen
Post subject: Re: Treaty Cruiser Design ChallengePosted: March 24th, 2018, 11:23 am
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Yes, I have to also ruin the party bit By reminding that this is Shipbucket forum, not springsharp forum. So if OP makes out threads in the drawing section which somehow engourages others to produce text posts rather than pictures, some moderation action may have to take Place. I've always told people that this is a Drawing and art community, not pseudo-engineering design forum.

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Shigure
Post subject: Re: Treaty Cruiser Design ChallengePosted: March 24th, 2018, 1:26 pm
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Joined: May 25th, 2016, 2:05 pm
I've made them optional now. I've requested them in order to make this contest fair because it's really easy to lie about your tonnage. I mean they did it IRL

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