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1

Tuesday, July 27th 2010, 5:21pm

GRT and Springsharp

I was looking some things over, and I wondered if there is any way to calculate - well, perhaps "guess" is more likely - what the gross register tonnage of a ship would be, using only Springsharp information?

2

Tuesday, July 27th 2010, 5:35pm

RE: GRT and Springsharp

Quoted

Originally posted by Brockpaine
I was looking some things over, and I wondered if there is any way to calculate - well, perhaps "guess" is more likely - what the gross register tonnage of a ship would be, using only Springsharp information?


Does this

Have sufficient information? I think it is pertinent to SS3 rather than the SS2 that we are using.

3

Tuesday, July 27th 2010, 5:38pm

Eh, Bruce?

That was pertinent to Springstyle, which was the orginal ship-designing tool back in the days with cavemen....ok, maybe a bit sooner. Then there was SS1, and then SS2, and then SS3.

Should still work for SS2, though.

4

Tuesday, July 27th 2010, 5:49pm

Bah, I can see I asked that before. :P

SS2 doesn't have loading submergence figures that I can see, and I'm not yet seeing how to calculate that...

5

Tuesday, July 27th 2010, 6:06pm

Here ya go....using your newest battleship design, the loading submergence would be the line that is bolded.....at least I think.

Quoted

Blanco Encalada, Canadian Vickers B40, Export Battleship laid down 1940

Displacement:
43,100 t light; 45,550 t standard; 49,150 t normal; 52,030 t full load

Dimensions: Length overall / water x beam x draught
809.62 ft / 803.81 ft x 108.00 ft x 30.00 ft (normal load)
246.77 m / 245.00 m x 32.92 m x 9.14 m

Armament:
12 - 15.00" / 381 mm guns (4x3 guns), 2,039.28lbs / 925.00kg shells, 1940 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
20 - 5.12" / 130 mm guns (10x2 guns), 67.11lbs / 30.44kg shells, 1940 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, 4 raised mounts - superfiring
12 - 3.00" / 76.2 mm guns (6x2 guns), 13.50lbs / 6.12kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
32 - 1.57" / 40.0 mm guns (8x4 guns), 1.95lbs / 0.88kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
24 - 0.79" / 20.0 mm guns (12x2 guns), 0.24lbs / 0.11kg shells, 1940 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 26,044 lbs / 11,813 kg
Shells per gun, main battery: 100

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.0" / 406 mm 490.00 ft / 149.35 m 14.00 ft / 4.27 m
Ends: Unarmoured
Main Belt covers 94 % of normal length

- Torpedo Bulkhead:
2.36" / 60 mm 490.00 ft / 149.35 m 28.00 ft / 8.53 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 16.0" / 406 mm 8.00" / 203 mm 12.0" / 305 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm

- Armour deck: 5.51" / 140 mm, Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 116,097 shp / 86,609 Kw = 28.00 kts
Range 12,000nm at 15.00 kts
Bunker at max displacement = 6,480 tons

Complement:
1,649 - 2,145

Cost:
£25.407 million / $101.627 million

Distribution of weights at normal displacement:
Armament: 2,728 tons, 5.5 %
Armour: 17,114 tons, 34.8 %
- Belts: 4,800 tons, 9.8 %
- Torpedo bulkhead: 1,199 tons, 2.4 %
- Armament: 3,883 tons, 7.9 %
- Armour Deck: 7,145 tons, 14.5 %
- Conning Tower: 87 tons, 0.2 %
Machinery: 3,104 tons, 6.3 %
Hull, fittings & equipment: 19,954 tons, 40.6 %
Fuel, ammunition & stores: 6,050 tons, 12.3 %
Miscellaneous weights: 200 tons, 0.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
77,000 lbs / 34,927 Kg = 45.6 x 15.0 " / 381 mm shells or 12.3 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 6.9 ft / 2.1 m
Roll period: 17.2 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.86
Seaboat quality (Average = 1.00): 1.19

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.661
Length to Beam Ratio: 7.44 : 1
'Natural speed' for length: 32.58 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 33.00 ft / 10.06 m
- Forecastle (40 %): 22.00 ft / 6.71 m
- Mid (75 %): 22.00 ft / 6.71 m
- Quarterdeck (20 %): 22.00 ft / 6.71 m
- Stern: 22.00 ft / 6.71 m
- Average freeboard: 23.76 ft / 7.24 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 78.2 %
- Above water (accommodation/working, high = better): 178.1 %
Waterplane Area: 70,067 Square feet or 6,509 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 216 lbs/sq ft or 1,056 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.21
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent

6

Tuesday, July 27th 2010, 6:19pm

Quoted

Originally posted by TexanCowboy
Here ya go....using your newest battleship design, the loading submergence would be the line that is bolded.....at least I think.

It's not. Should be significantly higher, if my review of older Springstyles is correct.

And I've never seen that battleship design before. It must be a top-secret design spread to induce confusion amongst my enemies.

7

Wednesday, July 28th 2010, 5:27pm

Let's forget about the 'loading submergence' (tons per inch, I believe): it's actually derived from the waterplane area, and I have no idea why Rick Robinson originally used it. To get the same result, you want the total enclosed volume, for which I may have posted a long and complicated formula somewhere. The quick and dirty version is:

(Length x Breadth x Draught x block coefficient) + (freeboard amidships x waterplane area)

Divide that by 100 to get the gross register tonnage if working in feet; divide by 2.832 in metres. The gross register ton was defined as 100 cubic feet, which means that the version in metres is an approximation.

This won't be completely exact, but given that there are various exemptions in the old GRT rules, it doesn't matter. Before the new, 1975 rules, a good naval architect could change the register tonnages quite a bit just by altering the structural details, without affecting the major characteristics of a ship at all. ?(

The method above rates the battleship at 32,629 gross tons.

By the way, under the modern rule 'gross tons' aren't used, and it is proper to speak of the RMS Queen Mary 2, for example, as having a gross tonnage of 148,528 - this is dimensionless.

This post has been edited 1 times, last edit by "RLBH" (Jul 28th 2010, 5:32pm)