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Re: Time Period for SDN World 3

Posted: 2009-10-19 05:05pm
by Ryan Thunder
Steve wrote:If your navy is to defend coastal waters you don't need Navy Focus of 4 or 5. Hell, with your coastline a 2 might be enough, since a realistic navy for your Gran Colombia would be based on protecting coastal waters and the Panama Canal.

Frankly at this point I'm ready to tie Navy Focus into Colonial Territory to A) encourage people to stop using it as a sink score and B) reflect that if you don't have overseas colonies, you don't need a long-ranging Navy as much.
Obviously I've misunderstood the meaning of it, then.

I was under the impression that the Naval rating was to do with the quality of the vessels in service, or how powerful it was in general...

What did you intend?

Re: Time Period for SDN World 3

Posted: 2009-10-19 05:49pm
by Beowulf
Thanas wrote:Germany would actually not be that much against a Naval Treaty, whatever its terms.

However, if two nations already said they will not sign it, I am hard-pressed to think whether this would not be pointless.
I propose one of the least useful treaties ever: a limitation of gun size to 16". C'est fini.

Re: Time Period for SDN World 3

Posted: 2009-10-19 06:04pm
by DarthShady
I've been having Internet access problems, hopefully I can catch up fully tomorrow and finish up my version of history and other stuff. If I end up MIA, the Balkans are still mine, so don't get any funny ideas. :P

Re: Time Period for SDN World 3

Posted: 2009-10-19 06:20pm
by Steve
Ryan Thunder wrote:
Steve wrote:If your navy is to defend coastal waters you don't need Navy Focus of 4 or 5. Hell, with your coastline a 2 might be enough, since a realistic navy for your Gran Colombia would be based on protecting coastal waters and the Panama Canal.

Frankly at this point I'm ready to tie Navy Focus into Colonial Territory to A) encourage people to stop using it as a sink score and B) reflect that if you don't have overseas colonies, you don't need a long-ranging Navy as much.
Obviously I've misunderstood the meaning of it, then.

I was under the impression that the Naval rating was to do with the quality of the vessels in service, or how powerful it was in general...

What did you intend?
I meant it to reflect everything - sophistication, support system, size - but Thanas' proposed refinements and other things may help me permit players to diversify how their Focus acts. To a degree. If your Navy is highly local you won't need the same amount of sophistication as a world-spanning fleet would, and you can easily purchase a license for advanced naval guns from the naval powers of the world.

Re: Time Period for SDN World 3

Posted: 2009-10-20 06:25am
by Fingolfin_Noldor
Beowulf wrote:
Thanas wrote:Germany would actually not be that much against a Naval Treaty, whatever its terms.

However, if two nations already said they will not sign it, I am hard-pressed to think whether this would not be pointless.
I propose one of the least useful treaties ever: a limitation of gun size to 16". C'est fini.
Well, 18" guns pose significant challeneges on their own without saying...

Re: Time Period for SDN World 3

Posted: 2009-10-20 08:34am
by Ryan Thunder
Fingolfin_Noldor wrote:Well, 18" guns pose significant challeneges on their own without saying...
Uh... what about my boat?

Re: Time Period for SDN World 3

Posted: 2009-10-20 12:43pm
by Fingolfin_Noldor
Question: How does one deal with "Hull strain in open seas" in Spring Sharp?

Re: Time Period for SDN World 3

Posted: 2009-10-20 12:53pm
by Thanas
It means your design would not be seaworthy, really. It is overweight and the hull would crack and you would get far less life out of your ship than intended.

Also, your ships would probably also not be strong enough to withstand enemy weapons.

In short - it is not advised for anything larger than a destroyer.

That is, unless you like having your battleships suddenly break apart.

Re: Time Period for SDN World 3

Posted: 2009-10-20 01:05pm
by Steve
Thanas wrote:It means your design would not be seaworthy, really. It is overweight and the hull would crack and you would get far less life out of your ship than intended.

Also, your ships would probably also not be strong enough to withstand enemy weapons.

In short - it is not advised for anything larger than a destroyer.

That is, unless you like having your battleships suddenly break apart.
I think he's asking how one fixes that.

Re: Time Period for SDN World 3

Posted: 2009-10-20 01:12pm
by Thanas
Reduce armor, engines, weaponry.

Basically, the hull is strained if it has too carry too much.

Re: Time Period for SDN World 3

Posted: 2009-10-20 01:16pm
by Ryan Thunder
Ah. I figured something like that would qualify as a design failure.

Valiant will be going back to the drawing board, then...

Re: Time Period for SDN World 3

Posted: 2009-10-20 01:24pm
by Beowulf
Ryan Thunder wrote:
Fingolfin_Noldor wrote:Well, 18" guns pose significant challeneges on their own without saying...
Uh... what about my boat?
Aside from the Furious, the only warship which has mounted guns of 18" caliber was the Yamato class. The Furious only mounted one, for a fairly short period of time, before getting converted to an aircraft carrier.
Thanas wrote:Reduce armor, engines, weaponry.

Basically, the hull is strained if it has too carry too much.
. Alternatively, increace displacement. For fast ships, increasing length while maintaining block coefficient is the easiest way to proceed, due to synergistic effects. It should be noted that ships which don't have to see the open sea can be built lighter, like the Baltic battleships.

Re: Time Period for SDN World 3

Posted: 2009-10-20 01:46pm
by Ma Deuce
Aside from the Furious, the only warship which has mounted guns of 18" caliber was the Yamato class.
Nope. The same 18" guns that armed Furious were also used on at least two 6,500 ton shore bombardment monitors in single mounts.

I would also like the add that even without the stress issues, the entire design concept is questionable, if Ryan intends the role for this vessel that I think he does (he called it a "coastal defense monitor", implying use against attacking ships). The design seems to be loosely based on the modified Lord Clive class monitors the British used toward the end of WWI, which were about the same size of his design and also mounted a single 18" gun. However, these ships were intended for offensive shore bombardment rather than defense, so in that role a single gun was acceptable. But against ships, a single big gun is near worthless. You'll have a very difficult time finding the right range with only one gun and will score very few hits even when you do (protip: 5% accuracy against moving ships at range was considered very good for big naval guns of the era). For a coast defense ship, you'll want no fewer than four large guns. For a good design template of this kind of ship, take a look at the Finnish Ilmarinen-class, which mounted four 10-inch guns on 4,000 tons. You can scale it up or down to suit your needs, but the basic design concept is well suited to this role. Sure, it was built about 7 years years after the start of our game, but I don't see that making a huge difference.

Re: Time Period for SDN World 3

Posted: 2009-10-20 02:09pm
by Ryan Thunder
Ma Deuce wrote:I would also like the add that even without the stress issues, the entire design concept is questionable, if Ryan intends the role for this vessel that I think he does (he called it a "coastal defense monitor", implying use against attacking ships).
Yeah, its a coastal defense monitor.
The design seems to be loosely based on the modified Lord Clive class monitors the British used toward the end of WWI, which were about the same size of his design and also mounted a single 18" gun.
Interesting. However, I actually based it off of the Erebus-class, and then replaced the twin 15" guns with a single 450 mm gun.
However, these ships were intended for offensive shore bombardment rather than defense, so in that role a single gun was acceptable. But against ships, a single big gun is near worthless. You'll have a very difficult time finding the right range with only one gun and will score very few hits even when you do (protip: 5% accuracy against moving ships at range was considered very good for big naval guns of the era). For a coast defense ship, you'll want no fewer than four large guns.
Ah. Thanks for the tip. I will endeavour to keep it in mind for future designs.
For a good design template of this kind of ship, take a look at the Finnish Ilmarinen-class, which mounted four 10-inch guns on 4,000 tons. You can scale it up or down to suit your needs, but the basic design concept is well suited to this role. Sure, it was built about 7 years years after the start of our game, but I don't see that making a huge difference.
I'll certainly have a look at it. It sounds quite a bit more efficient than what I have here...

Re: Time Period for SDN World 3

Posted: 2009-10-20 04:13pm
by Ryan Thunder
Spoiler
CSS Valiant, Columbian monitor laid down 1920

Displacement:
3 542 t light; 3 884 t standard; 4 000 t normal; 4 093 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(393.70 ft / 393.70 ft) x 49.21 ft x (14.76 / 15.02 ft)
(120.00 m / 120.00 m) x 15.00 m x (4.50 / 4.58 m)

Armament:
4 - 9.84" / 250 mm 45.0 cal guns - 480.81lbs / 218.09kg shells, 200 per gun
Breech loading guns in turret on barbette mounts, 1920 Model
4 x Single mounts on centreline, evenly spread
8 - 3.94" / 100.0 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 300 per gun
Breech loading guns in deck mounts, 1920 Model
8 x Single mounts on side ends, evenly spread
4 - 1.57" / 40.0 mm 40.0 cal guns - 1.87lbs / 0.85kg shells, 1 000 per gun
Anti-air guns in deck mounts, 1920 Model
4 x Single mounts on sides, aft evenly spread
4 - 0.79" / 20.0 mm 60.0 cal guns - 0.27lbs / 0.12kg shells, 2 000 per gun
Machine guns in deck mounts, 1920 Model
8 x Single mounts on side ends, evenly spread
Weight of broadside 2 190 lbs / 993 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.94" / 100 mm 236.22 ft / 72.00 m 8.43 ft / 2.57 m
Ends: 1.97" / 50 mm 157.45 ft / 47.99 m 8.43 ft / 2.57 m
Upper: 1.97" / 50 mm 236.22 ft / 72.00 m 8.01 ft / 2.44 m
Main Belt covers 92 % of normal length

- Torpedo Bulkhead - Strengthened structural bulkheads:
1.97" / 50 mm 236.22 ft / 72.00 m 12.83 ft / 3.91 m
Beam between torpedo bulkheads 49.21 ft / 15.00 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.94" / 100 mm - 1.97" / 50 mm

- Box over machinery & magazines:
1.97" / 50 mm
Forecastle: 1.97" / 50 mm Quarter deck: 1.97" / 50 mm

- Conning towers: Forward 1.97" / 50 mm, Aft 1.97" / 50 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 8 976 shp / 6 696 Kw = 20.00 kts
Range 1 200nm at 15.00 kts
Bunker at max displacement = 209 tons

Complement:
250 - 326

Cost:
£0.856 million / $3.425 million

Distribution of weights at normal displacement:
Armament: 581 tons, 14.5 %
- Guns: 581 tons, 14.5 %
Armour: 1 286 tons, 32.2 %
- Belts: 590 tons, 14.7 %
- Torpedo bulkhead: 221 tons, 5.5 %
- Armament: 123 tons, 3.1 %
- Armour Deck: 332 tons, 8.3 %
- Conning Towers: 21 tons, 0.5 %
Machinery: 314 tons, 7.8 %
Hull, fittings & equipment: 1 360 tons, 34.0 %
Fuel, ammunition & stores: 458 tons, 11.4 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6 471 lbs / 2 935 Kg = 13.6 x 9.8 " / 250 mm shells or 1.8 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 2.2 ft / 0.7 m
Roll period: 14.0 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- Recoil effect (Restricted arc if above 1.00): 1.06
Seaboat quality (Average = 1.00): 1.59

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.489 / 0.492
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 19.84 kts
Power going to wave formation at top speed: 44 %
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 %, 19.91 ft / 6.07 m, 16.31 ft / 4.97 m
- Forward deck: 30.00 %, 16.31 ft / 4.97 m, 12.66 ft / 3.86 m
- Aft deck: 30.00 %, 12.66 ft / 3.86 m, 12.66 ft / 3.86 m
- Quarter deck: 20.00 %, 12.66 ft / 3.86 m, 12.66 ft / 3.86 m
- Average freeboard: 14.23 ft / 4.34 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.5 %
- Above water (accommodation/working, high = better): 132.2 %
Waterplane Area: 12 786 Square feet or 1 188 Square metres
Displacement factor (Displacement / loading): 106 %
Structure weight / hull surface area: 100 lbs/sq ft or 487 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.86
- Overall: 1.05
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
How about that instead?

Re: Time Period for SDN World 3

Posted: 2009-10-20 04:25pm
by Thanas
That is actually a good design for a ship that size.

Re: Time Period for SDN World 3

Posted: 2009-10-20 05:22pm
by Ryan Thunder
Thanks. Would there be any benefit to having some barges with a few heavy guns on them for defending my ports, or should these monitors suffice?

Re: Time Period for SDN World 3

Posted: 2009-10-20 05:25pm
by Bluewolf
Is it OK if I get to steal/modify that design if I need to?

Re: Time Period for SDN World 3

Posted: 2009-10-20 05:25pm
by Thanas
Well, I am not sure if 10-inch batteries are enough against super-dreadnoughts. And I would suggest that you spend some points rather on fortresses instead of monitors. After all, a fortress is generally more tougher than an attacking ship. The Duchess has a picture thread of old forts in AMP.

Re: Time Period for SDN World 3

Posted: 2009-10-20 06:03pm
by Ryan Thunder
Thanas wrote:Well, I am not sure if 10-inch batteries are enough against super-dreadnoughts.
I was thinking of using 350-450 mm guns. I figure a 1-tonne shell should be effective against nearly anything that floats. :P
And I would suggest that you spend some points rather on fortresses instead of monitors. After all, a fortress is generally more tougher than an attacking ship. The Duchess has a picture thread of old forts in AMP.
Ah, fortifications. I love fortifications... :D

Although, I was under the impression that fortifications were largely ineffective during the first and second world wars. Didn't they just bombard them into rubble or overrun them with more mobile elements?

I'll happily build gratuitous numbers of polygonal and star forts if I can expect that they're going to be effective, but if not...

Re: Time Period for SDN World 3

Posted: 2009-10-20 06:14pm
by Thanas
Well, the Dardanelles forts did hold out quite well against an anglo-french fleet.

Re: Time Period for SDN World 3

Posted: 2009-10-20 07:54pm
by Steve
Forts are very potent, Ryan. And not as prone to destruction by bombardment as you think. There's a reason the Allies bypassed Truk and Rabaul. Singapore fell primarily because A) its commander was an idiot and coward and B) because the guns were pointing seaward, not toward the peninsula. And it wasn't even that fortified compared to what it could have been, as the US and UK had agreed not to fortify their Pacific islands to get Japan into the WNT.

Historically sea ships don't do so well against land forts. Finding the range for accurate fire is harder due to causing dust billows from shell impacts (the dust and soil thrown into the air cover the target and make range-finding hard or impossible), and shells on naval ships aren't as optimal against ground targets. You can pummel them down eventually, sure, but it's not like you'll win handily without enough force or a land ally to hit the forts too.

Re: Time Period for SDN World 3

Posted: 2009-10-20 08:05pm
by CmdrWilkens
Ryan Thunder wrote:
Thanas wrote:Well, I am not sure if 10-inch batteries are enough against super-dreadnoughts.
I was thinking of using 350-450 mm guns. I figure a 1-tonne shell should be effective against nearly anything that floats. :P
And I would suggest that you spend some points rather on fortresses instead of monitors. After all, a fortress is generally more tougher than an attacking ship. The Duchess has a picture thread of old forts in AMP.
Ah, fortifications. I love fortifications... :D

Although, I was under the impression that fortifications were largely ineffective during the first and second world wars. Didn't they just bombard them into rubble or overrun them with more mobile elements?

I'll happily build gratuitous numbers of polygonal and star forts if I can expect that they're going to be effective, but if not...
Fortresses are only as effective as the defending garrison. Look at the battles around Verdun and the defense of Antwerp, hell even the Leige and Namur battles were as much a matter of initiative at the middle grades of command rather than the ineffectiveness of fortification. Likewise several of the eastern front battles, on the Carpathian front in particular, turned on the major fortresses in the region.

Fortification in and of itself is a poor man's substitute for real military planning but well thought out fortification provides a base from which to either channel defensive effort by acting as breakwaters or to launch in to offensive operations with a secure logistics base. Fortifications which command natural avenues of advance are magnets for offensive and defensive operations where the well prepared defender will hold the advantage of the terrain knowledge and established lines of communication and supply.