History
During the early inter-war period the Finnish Navy consisted of some 30 ex-Russian vessels, most of them taken as war-trophies following the civil war. Never ideal types for the navy's needs, they were generally old and in poor condition. In 1925, a tragic incident highlighted the sorry state of the navy. An old torpedo boat was lost in a fierce storm, taking with her the entire crew of 53. A heated debate started, and intensive lobbying led to the adoption of a new Finnish Navy Act in 1927.
Prior to World War II, the fleet renewal program led to the acquisition or construction of five submarines, four torpedo boats, and two coastal defense ships. Among the last of their kind, the Väinämöinen and Ilmarinen were two of the most concentrated naval artillery units ever built. They were designed by the Dutch company NV Ingenieurskantoor voor Scheepsbouw, and were optimized for operations in the archipelagos of the Baltic Sea. Their open sea performance was de-emphasized in order to give the vessels their shallow draft and super-compact design.
Coastal defence ships were particularly popular in the Nordic countries, and began serving in the navies of Denmark, Sweden and Norway early in the 20th century. These vessels typically had heavy armament and good armor protection, but were relatively slow. Their sizes were around 4,000 tons, main armament consisted of guns between 210 and 240mm, the armor corresponded to that of armoured cruisers, and speeds were between 15 and 18 knots. A coastal defence ship was somewhere between a cruiser and a monitor: slower than a cruiser but better armed, faster than a monitor, but with smaller guns. The coastal defence ships also varied among themselves; some of them were closer to cruisers, and others, such as the Finnish ones, were closer to monitors.
Being the second of her class, Ilmarinen was launched at the Turku shipyard on 9 September 1933. The ship went through its finishing trials and was handed over to the Finnish Navy on 17 April 1934. Her sister ship Väinämöinen had preceded her by two years.
The vessels had a compact design, with a high mast and large turrets for main and secondary artillery. Foreign comments on their design ranged from puns to praise. Not truly designed for open sea operations, the ships had a tendency to roll slowly and widely even in moderate seas. Travel on them was unpleasant, but deemed safe. Additional keels were later fitted, which improved the situation somewhat.
The Väinämöinen and Ilmarinen had a displacement of 3,900 tonnes, a maximum length of 93 metres, and a draught of 4.50 metres. Requirements of speed and range were moderate, as they were expected to operate near their home bases. Both vessels were equipped with four diesel engines that powered two electrical engines. These generated a total of 4,800 hp. There were also two smaller 100 hp auxiliary diesel engines. Maximum speed was 14.5 knots, and range was further limited by the vessels' carrying capacity of only 93 tonnes of diesel oil.
The four 254mm Bofors guns were massive for vessels of this size, and they could hurl a 225 kg shell up to 31 km. The secondary artillery consisted of eight 105mm dual-purpose Bofors guns in four turrets. These were the primary defense against fast torpedo boats and aircraft. Additionally, the ships were equipped with four 40mm anti-aircraft guns (initially British-made "pom-pom" guns, which, after mediocre performance in the Winter War, were replaced with Bofors guns) and two 20mm Madsen auto-cannons (later increased to eight).
The purpose of the coastal defence ships was to prevent landing operations and naval blockades that threatened vital sea trade. Thanks to the construction of vast defensive systems during the czarist era, Finland had strong coastal artillery in permanent positions. These defenses were to be supplemented with minefields in times of unrest. One of the main purposes of the navy was to buy time for ground forces to deploy to the islands in the Archipelago. In these confined spaces, coastal defence ships armed with 254mm main artillery would have been a tough opponent for any ship of the era.
The Soviet Baltic Fleet was the obvious threat, and the Finnish vessels were meant to deter the largest Soviet ships, such as the battleships Marat and Oktyabrskaya Revolutsiya, as well as the cruiser Kirov, from venturing too close to Finnish shores.
Read more about this topic: Finnish Coastal Defence Ship Ilmarinen
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