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The Salmon of Wisdom

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Brockpaine

The Shadow

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Thursday, April 22nd 2010, 4:35pm

The Salmon of Wisdom

As per the Irish news, Ireland has sold two H-class subs and will build a new training submarine, the Bradán Feasa (Salmon of Wisdom). Only a single boat will be purchased in order to give the Irish yards the construction experience. A follow-on "production" design, the Pooka-class, is in the design stage and should incorporate



[SIZE=3]Bradán Feasa-class School-ship Submarine[/SIZE]
Date: 1939
Coastal
Armament 1x3" gun
ElecHP: 900hp
DieselHP: 1400hp
CREW: 29
wt fuel&batts: 190t
Light Displacement 400t
Loaded Displacement 507t
Full Displacement 654t
Reserve buoyancy: 22%
Max Surf Speed: 14.1 knots
Max Sub Speed: 8.4 knots

Length: 58.0m
Beam: 4.9m
Draft: 4.6m
Crush depth: 200m
#TT 4 x 533mm (4 bow, 8 reloads)
12 Mines
Tons Oil: 95.0t
Tons Battery: 95.0t
Cruise speed: 12 knots
Submerged speed: 6 knots

Surface Range: 6586nm@12 knots
Submerged Range: 43nm@6 knots

ALVAMA

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Thursday, April 22nd 2010, 5:36pm

Excellent! Wish I could build subs in the future :D
We'll see!

Brockpaine

The Shadow

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Thursday, April 22nd 2010, 6:05pm

The follow-on submarines will likely follow this general design. Unlike the Bradán Feasa, the Pookas ("Ghost") is designed for series production. Her engines (still B+W diesels and Paxman electric motors like the rest of the Irish ships) are substantially improved to permit higher surface speeds. (Design is based on the British U and V-class submarines.)

The Pookas are one of the pillars of the INS's War Emergency Plan in case war breaks out in Europe.



[SIZE=3]Pooka-class Coastal Submarine[/SIZE]
Date: 1939
Coastal
Armament 1x3" gun
ElecHP: 900hp
DieselHP: 4000hp
CREW: 45
wt fuel&batts: 190t
Light Displacement 526t
Loaded Displacement 621t
Full Displacement 706t
Reserve buoyancy: 12%
Max Surf Speed: 19.5 knots
Max Sub Speed: 8.3 knots

Length: 62.0m
Beam: 4.9m
Draft: 4.7m
Crush depth: 200m
#TT 4 x 533mm (4 bow, 8 reloads)
Tons Oil: 95.0t
Tons Battery: 95.0t
Cruise speed: 12 knots
Submerged speed: 6 knots

Surface Range: 6515nm@12 knots
Submerged Range: 40nm@6 knots

klagldsf

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Thursday, April 22nd 2010, 6:37pm

*snicker* Salmon of Wisdom :p

Brockpaine

The Shadow

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Thursday, April 22nd 2010, 6:45pm

It was just too perfect a name for a training submarine. :D

Red Admiral

Italian Stallion

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Thursday, April 22nd 2010, 7:04pm

Looks pretty good. Basing it off the U-Class makes fairly good sense for Ireland. It's a nice small, cheap and simple design for them to get started with.

I'm not sure about the follow on Pooka Class. The speed probably won't be able to be used because of seakeeping issues. It's a small submarine. You need a big raised bow to get decent seakeeping on the surface, or a much bigger sub. Is the extra speed worthwhile or is it better to simply have a bit more space available.

Brockpaine

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Thursday, April 22nd 2010, 8:31pm

Hm, you might be right, it might be better to have more space.

Tinkering with my sim, I can lower the diesel horsepower by 25% and it'll still give me 18.1 knots, still substantially faster than what the actual V-class subs were supposedly capable of (5-7 knots faster, depending on my choice of sources). Will also improve reserve buoyancy from 12% to 19%; I'd been a bit anxious that 12% is a bit low, so I feel that change might be acceptable.

Edit:

[SIZE=3]Pooka-class Coastal Submarine[/SIZE]
Date: 1939
Coastal
Armament 1x3" gun
ElecHP: 900hp
DieselHP: 3000hp
CREW: 37
wt fuel&batts: 190t
Light Displacement 476t
Loaded Displacement 571t
Full Displacement 706t
Reserve buoyancy: 19%
Max Surf Speed: 18.1 knots
Max Sub Speed: 8.3 knots

Length: 62.0m
Beam: 4.9m
Draft: 4.7m
Crush depth: 200m
#TT 4 x 533mm (4 bow, 8 reloads)
Tons Oil: 95.0t
Tons Battery: 95.0t
Cruise speed: 12 knots
Submerged speed: 6 knots

Surface Range: 6515nm@12 knots
Submerged Range: 40nm@6 knots

ALVAMA

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Thursday, April 22nd 2010, 9:47pm

That is a post war torpedo btw! ;)

Brockpaine

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Thursday, April 22nd 2010, 9:56pm

Quoted

Originally posted by ALVAMA
That is a post war torpedo btw! ;)

Huh?

Commodore Green

The Irish Legend

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Thursday, April 22nd 2010, 10:55pm

I think he means the drawing!!

Brockpaine

The Shadow

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Thursday, April 22nd 2010, 11:06pm

Quoted

Originally posted by Commodore Green
I think he means the drawing!!

(All together now!) Ohhhhhh!

No idea, honestly. I fiddled this up from Darth Panda's U-class drawings from Shipbucket, and the torpedo was there when I started. I'm presuming Ireland's going to use whatever 21" torp Britain/Commonwealth is using at present.

ShinRa_Inc

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Friday, April 23rd 2010, 2:07am

I think the RN has moved up to a larger calber of torpedo. Canada still uses the older 21", but mostly because the RCN is unwilling to refit all the cruisers to swap tubes at the moment.

TexanCowboy

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Friday, April 23rd 2010, 2:10am

Yeah, the 24.5'' torpedoes...those, the Russian 650 mm torpedoes, the Japanese 24'' torpedoes and the Italian/other nation 600 mm torpedoes are the other heavy hitters.

Brockpaine

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Friday, April 23rd 2010, 2:15am

Quoted

Originally posted by ShinRa_Inc
I think the RN has moved up to a larger calber of torpedo. Canada still uses the older 21", but mostly because the RCN is unwilling to refit all the cruisers to swap tubes at the moment.

For surface ships yes, but not for their latest submarines.

TexanCowboy

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Friday, April 23rd 2010, 2:35am

I don't think it's possible to fit a torpedo that size onto a submarine at this point in time.

Brockpaine

The Shadow

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Friday, April 23rd 2010, 2:37am

Sure it is.

TexanCowboy

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Friday, April 23rd 2010, 2:40am

But not reasonable. Not many reloads could be carried.

thesmilingassassin

The Chosen One

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Friday, April 23rd 2010, 2:50am

Not AS many reloads.

Brockpaine

The Shadow

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Friday, April 23rd 2010, 2:54am

Would depend on the size of the submarine. :P Both Bradan Feasa and the Pookas carry two torpedoes per tube - one in the tube, and one reload. Just like the historical U and V-class subs. Decided to stick with what I knew they could carry, rather than trying to get away with more.

Red Admiral

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Sunday, April 25th 2010, 12:27pm

Quoted

Originally posted by Brockpaine
Hm, you might be right, it might be better to have more space.

Tinkering with my sim, I can lower the diesel horsepower by 25% and it'll still give me 18.1 knots, still substantially faster than what the actual V-class subs were supposedly capable of (5-7 knots faster, depending on my choice of sources). Will also improve reserve buoyancy from 12% to 19%; I'd been a bit anxious that 12% is a bit low, so I feel that change might be acceptable.


It depends where you're getting your diesels from to an extent. I'd go for 2800hp, which would nicely represent two of the units used previously.
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