QuoteFletcher, USN DD laid down 1941
Displacement:
2,400 t light; 2,532 t standard; 2,806 t normal; 3,026 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(376.50 ft / 369.00 ft) x 39.67 ft x (13.45 / 14.21 ft)
(114.76 m / 112.47 m) x 12.09 m x (4.10 / 4.33 m)
Armament:
5 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 420 per gun
Dual purpose guns in deck and hoist mounts, 1941 Model
5 x Single mounts on centreline ends, majority aft
2 raised mounts - superfiring
2 - 1.57" / 40.0 mm 56.0 cal guns - 2.12lbs / 0.96kg shells, 2,000 per gun
Anti-air guns in deck mount, 1941 Model
1 x Twin mount on centreline, forward deck aft
6 - 0.79" / 20.0 mm 70.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
Machine guns in deck mounts, 1941 Model
2 x Single mounts on sides, aft deck centre
2 x Twin mounts on sides, forward deck centre
2 raised mounts
Weight of broadside 302 lbs / 137 kg
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.13" / 3 mm 0.13" / 3 mm 0.13" / 3 mm
- Box over machinery & magazines:
0.50" / 13 mm
Forecastle: 0.50" / 13 mm Quarter deck: 0.50" / 13 mm
- Conning towers: Forward 0.75" / 19 mm, Aft 0.00" / 0 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 60,263 shp / 44,956 Kw = 35.10 kts
Range 4,364nm at 15.00 kts
Bunker at max displacement = 494 tons
Complement:
192 - 250
Cost:
£1.868 million / $7.471 million
Distribution of weights at normal displacement:
Armament: 74 tons, 2.6 %
- Guns: 74 tons, 2.6 %
Armour: 229 tons, 8.2 %
- Armament: 4 tons, 0.2 %
- Armour Deck: 221 tons, 7.9 %
- Conning Tower: 3 tons, 0.1 %
Machinery: 1,383 tons, 49.3 %
Hull, fittings & equipment: 491 tons, 17.5 %
Fuel, ammunition & stores: 406 tons, 14.5 %
Miscellaneous weights: 223 tons, 7.9 %
- On freeboard deck: 216 tons
- Above deck: 7 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
544 lbs / 247 Kg = 8.7 x 5.0 " / 127 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 1.4 ft / 0.4 m
Roll period: 13.9 seconds
Steadiness - As gun platform (Average = 50 %): 37 %
- Recoil effect (Restricted arc if above 1.00): 0.23
Seaboat quality (Average = 1.00): 0.30
Hull form characteristics:
Hull has a flush deck,
a normal bow and large transom stern
Block coefficient (normal/deep): 0.499 / 0.509
Length to Beam Ratio: 9.30 : 1
'Natural speed' for length: 22.05 kts
Power going to wave formation at top speed: 72 %
Trim (Max stability = 0, Max steadiness = 100): 91
Bow angle (Positive = bow angles forward): 19.00 degrees
Stern overhang: 0.55 ft / 0.17 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 20.17 ft / 6.15 m, 14.79 ft / 4.51 m
- Forward deck: 30.00 %, 14.79 ft / 4.51 m, 9.41 ft / 2.87 m
- Aft deck: 35.00 %, 9.41 ft / 2.87 m, 7.61 ft / 2.32 m
- Quarter deck: 15.00 %, 7.61 ft / 2.32 m, 7.61 ft / 2.32 m
- Average freeboard: 11.14 ft / 3.39 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 169.4 %
- Above water (accommodation/working, high = better): 102.2 %
Waterplane Area: 10,132 Square feet or 941 Square metres
Displacement factor (Displacement / loading): 73 %
Structure weight / hull surface area: 35 lbs/sq ft or 172 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 0.68
- Overall: 0.52
Cramped machinery, storage, compartmentation space
Adequate accommodation and workspace room
Caution: Lacks seaworthiness - very limited seakeeping ability
Geared +10% range = 4800 nm @ 15 kn
7t: FCS
40t: 2x5 21" torps
160t: 4 sets of reloads for 21" torps
2t: 2 DC throwers
14t: 28 DCs + 14 mobilization allowance
QuoteAresthusa, Enter country Enter ship type laid down 1934
Displacement:
4,939 t light; 5,164 t standard; 5,934 t normal; 6,550 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(480.00 ft / 480.00 ft) x 51.00 ft x (14.00 / 15.20 ft)
(146.30 m / 146.30 m) x 15.54 m x (4.27 / 4.63 m)
Armament:
6 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 200 per gun
Quick firing guns in deck and hoist mounts, 1934 Model
3 x 2-gun mounts on centreline ends, majority forward
1 raised mount - superfiring
8 - 4.00" / 102 mm 45.0 cal guns - 32.28lbs / 14.64kg shells, 200 per gun
Dual purpose guns in deck and hoist mounts, 1934 Model
4 x 2-gun mounts on sides, evenly spread
16 - 0.50" / 12.7 mm 90.0 cal guns - 0.07lbs / 0.03kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1934 Model
4 x 4 row quad mounts on side ends, evenly spread
4 raised mounts
Weight of broadside 945 lbs / 429 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.25" / 57 mm 182.00 ft / 55.47 m 18.36 ft / 5.60 m
Ends: Unarmoured
Upper: 2.25" / 57 mm 50.85 ft / 15.50 m 12.71 ft / 3.87 m
Main Belt covers 58 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
2nd: 1.00" / 25 mm - -
3rd: 1.00" / 25 mm - -
- Armoured deck - single deck:
For and Aft decks: 1.28" / 33 mm
Forecastle: 1.00" / 25 mm Quarter deck: 1.00" / 25 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 72,156 shp / 53,829 Kw = 32.00 kts
Range 5,300nm at 18.00 kts
Bunker at max displacement = 1,387 tons
Complement:
337 - 439
Cost:
£2.755 million / $11.019 million
Distribution of weights at normal displacement:
Armament: 280 tons, 4.7 %
- Guns: 280 tons, 4.7 %
Armour: 913 tons, 15.4 %
- Belts: 453 tons, 7.6 %
- Armament: 46 tons, 0.8 %
- Armour Deck: 414 tons, 7.0 %
Machinery: 2,076 tons, 35.0 %
Hull, fittings & equipment: 1,563 tons, 26.3 %
Fuel, ammunition & stores: 995 tons, 16.8 %
Miscellaneous weights: 107 tons, 1.8 %
- On freeboard deck: 54 tons
- Above deck: 53 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3,735 lbs / 1,694 Kg = 34.6 x 6.0 " / 152 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.31
Metacentric height 2.9 ft / 0.9 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.39
Seaboat quality (Average = 1.00): 1.01
Hull form characteristics:
Hull has rise forward of midbreak,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.606 / 0.616
Length to Beam Ratio: 9.41 : 1
'Natural speed' for length: 21.91 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 27.00 ft / 8.23 m, 24.00 ft / 7.32 m
- Forward deck: 38.00 %, 24.00 ft / 7.32 m, 22.00 ft / 6.71 m
- Aft deck: 29.50 %, 14.00 ft / 4.27 m, 14.00 ft / 4.27 m
- Quarter deck: 12.50 %, 14.00 ft / 4.27 m, 14.00 ft / 4.27 m
- Average freeboard: 19.66 ft / 5.99 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 129.0 %
- Above water (accommodation/working, high = better): 194.0 %
Waterplane Area: 18,005 Square feet or 1,673 Square metres
Displacement factor (Displacement / loading): 97 %
Structure weight / hull surface area: 59 lbs/sq ft or 286 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.64
- Longitudinal: 1.34
- Overall: 0.69
Caution: Hull subject to strain in open-sea
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Warning: Beam between bulkheads too wide
The Aresthusa is my trial at what displacement the 0.75 / 0.9 break should be.
Option 1 - use SHP to determine BC
The supporting information on the ship is problematic.
32.5knts with 64,000shp allow determining the BC.
1325 tons of fuel oil is listed....and for the British fleet speed of 14knots
works out to 10,230nm.
The range is a bit irrelevant, the tons of fuel oil should be right
and would effect light displacement and standard displacement.
world-war.co.uk puts the tonnage at 5220 std, 6665 full load.
With this fuel loading it has 5229 Normal- maybe a mix up
but 4493 Std. and 4282 Light. So way off. .
And the Comp Str. Does not work out.
option 2- use alternative range
Elsewhere is listed 5300nm at 13 knots-
But that pushes the standard displacement to 4892-still low, and max disp. is far to low.
The Comp Str. is near correct at 0.73.
option 3- adjust BC to get right 5220 Std displacement, freeboard for 1.0+, then 1325 oil fuel
This gets us near the right max disp, and near the right standard,
while using the right fuel loading, and a reasonable range result.
5300nm & 18knots would take 1387tons fuel. -62 tons more.
Very close.
My guess is a handwritten 5300@18 was mis-copied at 5300@18.
The SHP is too high now, 72,000 vs. 64,000.
A small Transom nearly fixes things, 0.75comp str, 1.0 seakeeping
SHP 66,374 instead of 64,000 ...but all the plans show a cruiser stern.
Perhaps it only made 32 on trials at overload of 72,000,
while 31.1 knots gets 64,000shp for normal speed?
Comp St. is 0.79 for 31.1
The Armor scheme is quite problematic.
The 1" deck/gun protection is clear.
The magazines had 1-3" protection... ok Magazine box, but how much 1", how much 3" ?
The plan shows the deck raised amidships and a big patch of 2.25" belt armor there. About the same height as draft
amid ships, and with a strake aft, but not all along the waterline.
I wound up taking a image to Paint and counting the armor area to
figure the bet area, splitting the two strakes to the main and upper belts.
SS gives a Machinery length of 426.20 ft.
We know that destroyers, and over-engined ships like the Lexington BCs, had engines above the WL.
I am guessing this was the case here, that the engines extended above the WL,
and so they put a patch of armor on the sides and raised the armor deck 2 levels.
While fore/aft the deck was a protective deck and the magazines were under the protective deck with 3" sides
So you wind up with the Armor belt being about 16ft high forward, 8ft aft, for an average of 125
Misc Wt
28 FC
25 LR Radio
5t Paravanes
24 2TT3 21" 34
20t Floatplane
5t Catapult
Armor :
308 armor deck 1"
71 magazine box 3"
QuoteDisplacement:
14,880 t light; 15,585 t standard; 16,861 t normal; 17,883 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(462.37 ft / 452.76 ft) x 90.55 ft x (21.33 / 22.44 ft)
(140.93 m / 138.00 m) x 27.60 m x (6.50 / 6.84 m)
Armament:
4 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 300 per gun
Dual purpose guns in deck mounts, 1929 Model
2 x 2-gun mounts on centreline ends, evenly spread
12 - 1.18" / 30.0 mm 80.0 cal guns - 55.12lbs / 25.00kg shells, 900 per gun
Dual purpose guns in deck and hoist mounts, 1929 Model
4 x 2-gun mounts on side ends, evenly spread
2 x 2-gun mounts on centreline ends, evenly spread
2 raised mounts
Weight of broadside 882 lbs / 400 kg
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.31" / 8 mm - -
2nd: 0.31" / 8 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 20,259 shp / 15,113 Kw = 19.21 kts
Range 5,595nm at 16.00 kts
Bunker at max displacement = 2,298 tons
Complement:
739 - 961
Cost:
£2.697 million / $10.790 million
Distribution of weights at normal displacement:
Armament: 47 tons, 0.3 %
- Guns: 47 tons, 0.3 %
Armour: 7 tons, 0.0 %
- Armament: 7 tons, 0.0 %
Machinery: 606 tons, 3.6 %
Hull, fittings & equipment: 3,925 tons, 23.3 %
Fuel, ammunition & stores: 1,981 tons, 11.8 %
Miscellaneous weights: 10,295 tons, 61.1 %
- Hull below water: 10,141 tons
- Hull void weights: 44 tons
- Hull above water: 40 tons
- On freeboard deck: 40 tons
- Above deck: 30 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
32,601 lbs / 14,788 Kg = 618.3 x 4.7 " / 120 mm shells or 3.0 torpedoes
Stability (Unstable if below 1.00): 2.91
Metacentric height 20.8 ft / 6.3 m
Roll period: 8.3 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle, raised quarterdeck ,
a ram bow and a round stern
Block coefficient (normal/deep): 0.675 / 0.680
Length to Beam Ratio: 5.00 : 1
'Natural speed' for length: 21.28 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 23.62 ft / 7.20 m, 23.62 ft / 7.20 m
- Forward deck: 30.00 %, 15.42 ft / 4.70 m, 15.42 ft / 4.70 m
- Aft deck: 30.00 %, 15.42 ft / 4.70 m, 15.42 ft / 4.70 m
- Quarter deck: 20.00 %, 23.62 ft / 7.20 m, 23.62 ft / 7.20 m
- Average freeboard: 18.70 ft / 5.70 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 80.8 %
- Above water (accommodation/working, high = better): 127.7 %
Waterplane Area: 32,130 Square feet or 2,985 Square metres
Displacement factor (Displacement / loading): 145 %
Structure weight / hull surface area: 95 lbs/sq ft or 465 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.56
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Royn "Oil" is a naval auxiliary tanker.
Designed to be able to fit in the merchant docks in the Pacific, max of 141m.
Designed with a shallow draf to fit almost any port, military or civilian.
This fleet oiler auxiliary is meant to be able to keep up with the battleline over strategic spaces. Maximum speed is designed to let it cruise on 1/2power.
7553*2 = 15106hp needed
Range IS 5595 *1.15 = 6434
Tonnage is meant to complete within 2 years, and
tt 15,000 tons, it takes 24 months to completion.
But can be launched after 9.6 months, allowing docks to be prepped for the next vessel.
Maximum displacement would be 11 months in dock +1 to clear the dock, which would be
11/0.4 = 27.5 months
27.5-9 = 18.5 = 18,500 tons light disp.
While there are economies of scale with larger vessels,
that also makes their loss more difficult.
With 10,000 tons of bunker oil, any two battleships can fully refuel from one tanker.
Ams & Armor
Normal : 17036 * 0.02 = 340t arms & armor
Guns & Armor : 54
Torpedo nets : 141
Total : 195
Misc Wt :
44t - Reserves
AD
5t - FC 1930
25t - LR Radio
0t - SR Radio
OD
40t - 2x 20t Motor launches
HAW
25t - Add Fire Suppresion gear
15t - CO2 Compressor AC
HBW
141t - Torpedo Nets
10,000 - Fuel Oil for Replenishment
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