HSwMS Vättern (J24)  and  HSwMS Mälaren (J25)

The story which didn't happen ... outside Atlantic Air Combat

A debate had been going on for some time in Sweden about whether to scrap, maintain or develop their "blue water" navy (re: the 3 Sverige class, and the 2 Tre Kronor class heavy cruisers commissioned after WW2).  In the light of Soviet military development,  Sweden felt they couldn't do else than expand their own military to secure their neutrality and so decided in January 1956 to strengthen their navy, and acquire aircraft two carriers.           

While the carriers were supposed to provide air cover for their Artic fleet, the Swedish Navy was perfectly conscious of the threat posed by aircrafts to a surface fleet.  They therefore ordered two specifically designed missile destroyers to take advantage of the RSC151 missile, initially developped by Oerlikon in Switzerland and further enhance by Bofors.  Three such destroyers had been ordered initially but the third Lake class destroyer was later cancelled notwithstanding the fact that works were well advanced.

With the help of the US Navy,
Eriksbergs Mekaniska Verkstads AB developped an automatically reloading (single) launcher, very much similar to the one developped in the US for the Talos and later Tartar missiles.  A similar system was developped to handle the RIM-72 Chaparral missile system, although this was a quadruple type launcher

To counter surface missiles, these destroyers where equipped with quad 13.2mm radar directed mountings.  Closely related to the American Maxon quads, it was a rather light system to counter anti-shipping missiles but since the system proved to be very much lethal at short range, it was adopted.

In a more classical range the destroyers were equipped with two twin 120mm dual purpose turrets

Foreign Sales

Not only Eriksbergs managed to sell a refitted Colossus carrier to South Africa but they also managed to seel this country the third Lake destroyer.   However, taking into account the embargo the US was implementing against South Africa, this third ship was delivered without the RIM-72 system.   Instead, South Africa asked to install one the QF2 pom-pom quad guns, of which they had plenty in storage.  The ship entered service with the South African Navy as the Walter T. Ashcroft after the name of a WW2 POW who served in the Royal Navy.


Although the ship was classical in design, its propulsion wasn't.   Contrary to modern destroyers and frigates, the Lake class was not turbine but diesel powered with a pair of 19800KW MAN diesel.   While this propulsion setup prevented the ship to reach high speed, it offered them a much larger range, ensuring that air defence was effectively offered to the carrier it was supposed to escort.   This solution was thus chosen, considering it was much more important to be able to cruise at 25 knots than jumping at 35 knots and consume all fuel.   Top speed in calm sea was measured at 31 knots.

SAR - Search And Rescue (PEDRO)
The Lake destroyers were provided with helipad but not with a hangar.   Considering these vessels were to operate along a carrier, it was considered unnecessary to supply it with hangar facilities.   But allowing a small helicopter to land on the ship was a bonus.   While not larege enough to allow large helicopters to land, the helipad could nevertheless accept a variety of smaller aircrafts, either the HH-43B selected to operate from the carriers, or an Alouette III, a Westland Wasp or even a Sikorsky HSS-1