Shipbucket

The thing I do not understend is how a 18-inch gunned ship will end up with the Block Coefficent of a Destroyer once the issue about the topredo bulkhead is solved. All the battleships I've "tried" on springsharp needed BCs around 0.6/0.65 to work properly (ok, that I usually design unnecessary oversized monsters and I have a thing for 33knot-boats but Usually they are lighter when it comes to TB and barbette armor).

edit:
I've just noticed that she has a 126-foot beam (38.4m) which is a lot. She is beamier than the planned USS Montana.
David, that beam comes from the actual specifications for the 1919 Battleship study or it is a guess? In case it is not from the offical sources I'd reduce it to 108 feet (33m) so she can fit through the Panama locks, this will drasticaly reduce displacement, and I suppose once the Torpedo Bulkhead issue is solved, lead to a Block Coefficent between 0.6 and 0.65.
If the beam figureinstead comes from the official data, well, scrap what I've said.

_________________
My Worklist
Sources and documentations are the most welcome.

-Koko Kyouwakoku (Republic of Koko)
-Koko's carrier-based aircrafts of WWII
-Koko Kaiun Yuso Kaisha - KoKaYu Line (Koko AU spinoff)
-Koko - Civil Aviation

Okay torpedo belt's gone and the armor belt is shortened and RHS = 1.00 . . . now what?

USS New Hampshire, USA Battleship laid down 1920

Displacement:
45,384 t light; 47,965 t standard; 49,700 t normal; 51,088 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(828.40 ft / 807.00 ft) x 126.00 ft x (35.00 / 35.72 ft)
(252.50 m / 245.97 m) x 38.40 m x (10.67 / 10.89 m)

Armament:
8 - 18.00" / 457 mm 48.0 cal guns - 3,054.04lbs / 1,385.29kg shells, 100 per gun
Breech loading guns in turret on barbette mounts, 1920 Model
2 x 2-gun mounts on centreline, aft evenly spread
2 raised mounts
2 x 2-gun mounts on centreline, forward evenly spread
18 - 6.00" / 152 mm 53.0 cal guns - 115.76lbs / 52.51kg shells, 150 per gun
Quick firing guns in deck and hoist mounts, 1920 Model
2 x 3-gun mounts on sides amidships
2 raised mounts
4 x 3-gun mounts on side ends, evenly spread
4 raised mounts
9 - 5.00" / 127 mm 25.0 cal guns - 56.77lbs / 25.75kg shells, 200 per gun
Dual purpose guns in deck mounts, 1920 Model
9 x Single mounts on sides, evenly spread
9 raised mounts
Weight of broadside 27,027 lbs / 12,259 kg
Main Torpedoes
4 - 21.0" / 533 mm, 20.00 ft / 6.10 m torpedoes - 1.303 t each, 5.212 t total
In 2 sets of deck mounted carriage/fixed tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 15.0" / 381 mm 524.55 ft / 159.88 m 13.47 ft / 4.11 m
Ends: Unarmoured
Main Belt covers 100 % of normal length

- Torpedo Bulkhead - Strengthened structural bulkheads:
10.0" / 254 mm 524.55 ft / 159.88 m 33.00 ft / 10.06 m
Beam between torpedo bulkheads 126.00 ft / 38.40 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 18.0" / 457 mm 8.00" / 203 mm 18.0" / 457 mm
2nd: 10.0" / 254 mm 6.00" / 152 mm 10.0" / 254 mm

- Box over machinery & magazines:
6.00" / 152 mm
Forecastle: 6.00" / 152 mm Quarter deck: 6.00" / 152 mm

- Conning towers: Forward 20.00" / 508 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines, plus batteries,
Electric motors, 4 shafts, 125,500 shp / 93,623 Kw = 28.00 kts
Range 10,000nm at 10.00 kts
Bunker at max displacement = 3,122 tons

Complement:
1,663 - 2,163

Cost:
£11.526 million / $46.103 million

Distribution of weights at normal displacement:
Armament: 5,603 tons, 11.3 %
- Guns: 5,597 tons, 11.3 %
- Weapons: 7 tons, 0.0 %
Armour: 20,689 tons, 41.6 %
- Belts: 4,580 tons, 9.2 %
- Torpedo bulkhead: 6,405 tons, 12.9 %
- Armament: 5,643 tons, 11.4 %
- Armour Deck: 3,478 tons, 7.0 %
- Conning Tower: 582 tons, 1.2 %
Machinery: 4,388 tons, 8.8 %
Hull, fittings & equipment: 14,703 tons, 29.6 %
Fuel, ammunition & stores: 4,316 tons, 8.7 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
63,480 lbs / 28,794 Kg = 21.8 x 18.0 " / 457 mm shells or 13.9 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 8.8 ft / 2.7 m
Roll period: 17.8 seconds
Steadiness - As gun platform (Average = 50 %): 64 %
- Recoil effect (Restricted arc if above 1.00): 0.64
Seaboat quality (Average = 1.00): 1.28

Hull form characteristics:
Hull has rise forward of midbreak,
a straight bulbous bow and a round stern
Block coefficient (normal/deep): 0.489 / 0.492
Length to Beam Ratio: 6.40 : 1
'Natural speed' for length: 28.41 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 40.00 degrees
Stern overhang: -6.00 ft / -1.83 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 25.50 ft / 7.77 m, 25.50 ft / 7.77 m
- Forward deck: 40.00 %, 25.50 ft / 7.77 m, 25.50 ft / 7.77 m
- Aft deck: 25.00 %, 17.50 ft / 5.33 m, 17.50 ft / 5.33 m
- Quarter deck: 15.00 %, 17.50 ft / 5.33 m, 17.50 ft / 5.33 m
- Average freeboard: 22.30 ft / 6.80 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77.3 %
- Above water (accommodation/working, high = better): 171.9 %
Waterplane Area: 67,065 Square feet or 6,231 Square metres
Displacement factor (Displacement / loading): 90 %
Structure weight / hull surface area: 262 lbs/sq ft or 1,281 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.59
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Good seaboat, rides out heavy weather easily

_________________
My Avatar is
French Vice-admiral Louis-René-Madeleine Le Vassor de La Touche, comte de Tréville
The original spelling of my last name is: LaTouche.

If I use their 6" gun placement--which is the whole perpose of this exercise--it has to be roughly 126 '



I can't understand how that hull can have such a low BC.

_________________
My Avatar is
French Vice-admiral Louis-René-Madeleine Le Vassor de La Touche, comte de Tréville
The original spelling of my last name is: LaTouche.

is it just me, or do you have an trim of 40 degrees?
also, an GM of 2,7 seems a bit much, it is said that the max GM can best be 3% of the beam, while you now have 7%

_________________
Drawings are credited with J.Scholtens
I ask of you to prove me wrong. Not say I am wrong, but prove it, because then I will have learned something new.
Shipbucket Wiki admin

It's still there:

"- Torpedo Bulkhead - Strengthened structural bulkheads:
10.0" / 254 mm 524.55 ft / 159.88 m 33.00 ft / 10.06 m
Beam between torpedo bulkheads 126.00 ft / 38.40 m"

You don't need to get rid of it, just reduce it to 3.5"

_________________
We can't stop here--this is Bat country!

If it's close enough to cast a shadow, I think the flying house wins initiative.

Bronies are like the Forsworn. Everyone agrees that they are a problem but nobody wants to expend the energy rooting them out.

"That is a very graphic analogy which aids understanding wonderfully while being, strictly speaking, wrong in every possible way."

Ace,

The trim=50 but the bow angle=40.

It's been a long day and I might be dense, but what is a GM?

_________________
My Avatar is
French Vice-admiral Louis-René-Madeleine Le Vassor de La Touche, comte de Tréville
The original spelling of my last name is: LaTouche.

I believe it's gone now.

USS New Hampshire, USA Battleship laid down 1920

Displacement:
45,807 t light; 48,335 t standard; 49,926 t normal; 51,198 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(828.40 ft / 807.00 ft) x 126.00 ft x (35.00 / 35.66 ft)
(252.50 m / 245.97 m) x 38.40 m x (10.67 / 10.87 m)

Armament:
8 - 18.00" / 457 mm 48.0 cal guns - 3,054.04lbs / 1,385.29kg shells, 100 per gun
Breech loading guns in turret on barbette mounts, 1920 Model
2 x 2-gun mounts on centreline, aft evenly spread
2 raised mounts
2 x 2-gun mounts on centreline, forward evenly spread
18 - 6.00" / 152 mm 53.0 cal guns - 115.76lbs / 52.51kg shells, 100 per gun
Quick firing guns in deck and hoist mounts, 1920 Model
2 x 3-gun mounts on sides amidships
2 raised mounts
4 x 3-gun mounts on side ends, evenly spread
4 raised mounts
9 - 5.00" / 127 mm 25.0 cal guns - 56.77lbs / 25.75kg shells, 200 per gun
Dual purpose guns in deck mounts, 1920 Model
9 x Single mounts on sides, evenly spread
9 raised mounts
Weight of broadside 27,027 lbs / 12,259 kg
Main Torpedoes
4 - 21.0" / 533 mm, 20.00 ft / 6.10 m torpedoes - 1.303 t each, 5.212 t total
In 2 sets of deck mounted carriage/fixed tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 15.0" / 381 mm 424.55 ft / 129.40 m 13.47 ft / 4.11 m
Ends: Unarmoured
Upper: 13.5" / 342 mm 0.00 ft / 0.00 m 8.00 ft / 2.44 m
Main Belt covers 81 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 18.0" / 457 mm 8.00" / 203 mm 18.0" / 457 mm
2nd: 10.0" / 254 mm 6.00" / 152 mm 10.0" / 254 mm

- Box over machinery & magazines:
6.00" / 152 mm
Forecastle: 6.00" / 152 mm Quarter deck: 6.00" / 152 mm

- Conning towers: Forward 20.00" / 508 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines, plus batteries,
Electric motors, 4 shafts, 125,968 shp / 93,972 Kw = 28.00 kts
Range 9,000nm at 10.00 kts
Bunker at max displacement = 2,863 tons

Complement:
1,669 - 2,170

Cost:
£11.566 million / $46.265 million

Distribution of weights at normal displacement:
Armament: 5,603 tons, 11.2 %
- Guns: 5,597 tons, 11.2 %
- Weapons: 7 tons, 0.0 %
Armour: 14,854 tons, 29.8 %
- Belts: 4,407 tons, 8.8 %
- Armament: 5,643 tons, 11.3 %
- Armour Deck: 4,219 tons, 8.5 %
- Conning Tower: 584 tons, 1.2 %
Machinery: 4,404 tons, 8.8 %
Hull, fittings & equipment: 20,945 tons, 42.0 %
Fuel, ammunition & stores: 4,119 tons, 8.3 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
62,627 lbs / 28,407 Kg = 21.5 x 18.0 " / 457 mm shells or 5.3 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 8.2 ft / 2.5 m
Roll period: 18.5 seconds
Steadiness - As gun platform (Average = 50 %): 61 %
- Recoil effect (Restricted arc if above 1.00): 0.65
Seaboat quality (Average = 1.00): 1.22

Hull form characteristics:
Hull has rise forward of midbreak,
a straight bulbous bow and a round stern
Block coefficient (normal/deep): 0.491 / 0.494
Length to Beam Ratio: 6.40 : 1
'Natural speed' for length: 28.41 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 40.00 degrees
Stern overhang: -6.00 ft / -1.83 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 25.50 ft / 7.77 m, 25.50 ft / 7.77 m
- Forward deck: 40.00 %, 25.50 ft / 7.77 m, 25.50 ft / 7.77 m
- Aft deck: 25.00 %, 17.50 ft / 5.33 m, 17.50 ft / 5.33 m
- Quarter deck: 15.00 %, 17.50 ft / 5.33 m, 17.50 ft / 5.33 m
- Average freeboard: 22.30 ft / 6.80 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 76.9 %
- Above water (accommodation/working, high = better): 171.6 %
Waterplane Area: 67,199 Square feet or 6,243 Square metres
Displacement factor (Displacement / loading): 102 %
Structure weight / hull surface area: 260 lbs/sq ft or 1,270 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.57
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Good seaboat, rides out heavy weather easily

_________________
My Avatar is
French Vice-admiral Louis-René-Madeleine Le Vassor de La Touche, comte de Tréville
The original spelling of my last name is: LaTouche.

GM = metacentric height.
what is that bow angle? I am not familar with springsharp, but I find that an somewhat weird value if it is what I think it is.

_________________
Drawings are credited with J.Scholtens
I ask of you to prove me wrong. Not say I am wrong, but prove it, because then I will have learned something new.
Shipbucket Wiki admin

From the waterline to the stem the bow pitches 40 degrees forward. From the waterline down the bow is perpendicular to the main deck.

_________________
My Avatar is
French Vice-admiral Louis-René-Madeleine Le Vassor de La Touche, comte de Tréville
The original spelling of my last name is: LaTouche.

Here is it. (sorry for the pic-driven answer, but I though I would hav not beign able to explain it accurately enough).

_________________
My Worklist
Sources and documentations are the most welcome.

-Koko Kyouwakoku (Republic of Koko)
-Koko's carrier-based aircrafts of WWII
-Koko Kaiun Yuso Kaisha - KoKaYu Line (Koko AU spinoff)
-Koko - Civil Aviation