Imperial Swedish Navy

The Ehrenstral class was followed by the Forstena type. They shared a common hull but had diffrent arnament. The Forstena or F-type had more emphasis on surface warfare and had a powerfull gunarnament consisting of 2x3 120mm m/42 semiautomatic guns.The airdefence consisted of 7x2 40mm m/36 guns. For ASW the ship got active sonar and 2x3 305mm Squid asw grenades.

The ships where modernized with new sensors and AAA artillery during the 1950s and finally the torpedoes where replace by RBS 08F SSM in 1964-66.

The ships where often deployed as surface action groups around the world - especially when the cruisers where falling to age and money. They where withdrawn from service when the Mannerheim and Lewenhaupt entered service between 1976-80.

[ img ]

_________________
Dieu et mon droit
Solus dux nullus ductus

Worklist
All Royal Swedish Navy units from 1522 to present

This is the Gathenhielm class destoryers. Designed between 1946 and 1948 to replace all the old prewar destroyers. As many as possible of the war lessons where incorporated in the desgned.

The where slightly enlarged over the preceeding Forstena class. They where also armed with the brand new full automatic 12cm L50 Bofors M50 gun and the new 49/48 L70 automatic antiaircraft gun. The torpedo arnment was reduce in favour of preparation for the design of SSMs. The 375mm ASW rocket replace the squid used on the older destroyer clases.

WIP
Greatful for some comments on the ship concept and the drawing.

The top drawing is as completed 1952. The bottom drawing is after MLU 1964.

_________________
Dieu et mon droit
Solus dux nullus ductus

Worklist
All Royal Swedish Navy units from 1522 to present

I'm not certain about the two ASW mortars and the radar placement seems rather low.
The Air search radar in particular seems perfectly placed to irradiate the bridge.
Also, what is that thing on the stern?

_________________
“Close” only counts with horseshoes, hand grenades, and tactical nuclear weapons.
That which does not kill me has made a grave tactical error

Worklist

Source Materiel is always welcome.

Quote:

I'm not certain about the two ASW mortars and the radar placement seems rather low.The Air search radar in particular seems perfectly placed to irradiate the bridge.

Yes, but look at the IRL Halland - she carried the AURAK that way on the bow and had the LW-02/ PS-47 in a similar position.

Quote:

Also, what is that thing on the stern?

It is a "lysraketautomat" an automatic illumination rocket launcher, very common in the 50s on RSwN ships. I think it also can be used for chaff and flare rockets aswell

_________________
Dieu et mon droit
Solus dux nullus ductus

Worklist
All Royal Swedish Navy units from 1522 to present

I was gonna ask if this is a improved and "Up gunned" version of the Halland class DD in having a 3rd 120mm instead of the single 57mm which the Hallands had fitted as B mounts

_________________
[ img ]

"The British Air Farce have droopped their bums on the water works..They have scored a direct hot on the pimps"- British agent/gendarme Officer Crabtree, "Allo,Allo."

To me they look very much over-gunned and unbalanced. Compare the Colombian Veinte de Julio-class:http://shipbucket.com/images.php?dir=Re ... io-0-1.png

_________________
My Avatar:Петр Алексеевич Безобразов (Petr Alekseevich Bezobrazov), Вице-адмирал , царская ВМФ России(1845-1906) - I sign my drawings as Ari Saarinen

Well...I've tried to make the ultimate gunnery destroyer with all the war experience in hand, I used the Halland and especially the Columbian version as a start. I think I have to reduce the AURAK to one and look over the SSM installation. She slightly larger - 5m longer in WL, a meter wider.

The next or improved version of this will be the Horn - bascially a Halland with two 57mm twins in B and X position.

The Columbians differed from Halland in having 3x120mm, 4x40mm and only 5 TTs, 1 AURAK and no SSM rail. I have also looked at the never built Lappland (2x2 120mm, 7x40/48, no 57mm)

But I think the Daring class is the closest equilant, even thoug I use mostly swedish weaponsystem.

_________________
Dieu et mon droit
Solus dux nullus ductus

Worklist
All Royal Swedish Navy units from 1522 to present

The springsharp file
As built

Quote:

Gathenhielm, Sweden Destroyer laid down 1949

Displacement:
3 150 t light; 3 277 t standard; 3 500 t normal; 3 678 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(396,69 ft / 387,14 ft) x 45,93 ft x (14,76 / 15,29 ft)
(120,91 m / 118,00 m) x 14,00 m x (4,50 / 4,66 m)

Armament:
6 - 4,72" / 120 mm 50,0 cal guns - 55,82lbs / 25,32kg shells, 300 per gun
Auto rapid fire guns in turret on barbette mounts, 1950 Model
3 x Twin mounts on centreline ends, majority forward
1 raised mount - superfiring
6 - 1,57" / 40,0 mm 70,0 cal guns - 2,19lbs / 0,99kg shells, 150 per gun
Anti-air guns in deck mounts, 1948 Model
6 x Single mounts on sides, evenly spread
6 raised mounts
Weight of broadside 348 lbs / 158 kg
Main Torpedoes
4 - 21,0" / 533 mm, 26,25 ft / 8,00 m torpedoes - 1,786 t each, 7,144 t total
In 2 sets of deck mounted centre rotating tubes
Main DC/AS Mortars
2 - 231,49 lbs / 105,00 kg Depth Charges + 20 reloads - 2,274 t total
in Stern depth charge racks
2nd DC/AS Mortars
8 - 440,92 lbs / 200,00 kg trainable AS Mortars + 5 reloads - 2,559 t total

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0,79" / 20 mm 251,64 ft / 76,70 m 8,14 ft / 2,48 m
Ends: Unarmoured
Main Belt covers 100 % of normal length
Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,18" / 30 mm 0,39" / 10 mm 1,18" / 30 mm
2nd: 0,20" / 5 mm 0,20" / 5 mm -

- Armoured deck - multiple decks:
For and Aft decks: 0,39" / 10 mm

- Conning towers: Forward 0,79" / 20 mm, Aft 0,00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 71 796 shp / 53 560 Kw = 35,00 kts
Range 3 000nm at 16,00 kts
Bunker at max displacement = 401 tons

Complement:
226 - 295

Cost:
£2,888 million / $11,553 million

Distribution of weights at normal displacement:
Armament: 165 tons, 4,7 %
- Guns: 119 tons, 3,4 %
- Weapons: 45 tons, 1,3 %
Armour: 189 tons, 5,4 %
- Belts: 67 tons, 1,9 %
- Armament: 47 tons, 1,3 %
- Armour Deck: 70 tons, 2,0 %
- Conning Tower: 4 tons, 0,1 %
Machinery: 1 651 tons, 47,2 %
Hull, fittings & equipment: 1 021 tons, 29,2 %
Fuel, ammunition & stores: 350 tons, 10,0 %
Miscellaneous weights: 125 tons, 3,6 %
- Hull below water: 50 tons
- Hull above water: 25 tons
- On freeboard deck: 25 tons
- Above deck: 25 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1 260 lbs / 571 Kg = 23,9 x 4,7 " / 120 mm shells or 0,3 torpedoes
Stability (Unstable if below 1.00): 1,15
Metacentric height 2,0 ft / 0,6 m
Roll period: 13,6 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0,23
Seaboat quality (Average = 1.00): 0,66

Hull form characteristics:
Hull has rise forward of midbreak, low quarterdeck ,
a normal bow and small transom stern
Block coefficient (normal/deep): 0,467 / 0,473
Length to Beam Ratio: 8,43 : 1
'Natural speed' for length: 21,33 kts
Power going to wave formation at top speed: 71 %
Trim (Max stability = 0, Max steadiness = 100): 77
Bow angle (Positive = bow angles forward): 20,00 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 %, 26,25 ft / 8,00 m, 22,97 ft / 7,00 m
- Forward deck: 30,00 %, 22,97 ft / 7,00 m, 19,69 ft / 6,00 m
- Aft deck: 35,00 %, 11,48 ft / 3,50 m, 11,48 ft / 3,50 m
- Quarter deck: 15,00 %, 11,15 ft / 3,40 m, 11,48 ft / 3,50 m
- Average freeboard: 16,97 ft / 5,17 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 165,2 %
- Above water (accommodation/working, high = better): 126,1 %
Waterplane Area: 11 772 Square feet or 1 094 Square metres
Displacement factor (Displacement / loading): 85 %
Structure weight / hull surface area: 55 lbs/sq ft or 270 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,65
- Longitudinal: 1,81
- Overall: 0,72
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Caution: Lacks seaworthiness - very limited seakeeping ability

_________________
Dieu et mon droit
Solus dux nullus ductus

Worklist
All Royal Swedish Navy units from 1522 to present

...the last two sentences, which, I believe, support my argument above.

Shipbucket

Who is online