Yubari, the smallest of Japanese cruisers built after World War I, was in fact an experimental design. The ship was intended as a test bed for new technologies to be employed in the construction of the future Furutaka class heavy cruisers. The ship’s lead designer Fujimoto Kikuo, working under the supervision of the Imperial Navy’s chief naval architect Hiraga Yuzuru, set out to create a fast and heavily armed cruiser with the lightest displacement possible. What emerged was a vessel capable of the same speed, range and broadside weight as those of 5,500 ton ships, but with a significantly lower displacement.   The construction of the cruiser was initially authorized under the 1917 8-4 Fleet Program, but funding wasn’t available until the launch of the 1921 8-6 Fleet Program, where the ship was listed under the name Ayase. The blueprints were formally approved in October 1921 and on December 23, 1921 the ship was renamed Yubari – a reference to the river Yubarigawa in Hokkaido. Sea trials of the cruiser confirmed her expected sea keeping characteristics, but also showed she was overweight – not an uncommon feature for Japanese designs. After she had been completed, Yubari’s normal displacement (with a 25 percent fuel reserve) was 419 tons (14 percent) above the design figures. This had a detrimental effect on the ship’s speed. During a one-mile run carried out on July 5, 1923 Yubari (displacing 3,463 tons) reached the top speed of 34.786 kt with the machinery producing 61,336 hp at 409.87 rpm. With 75 percent of fuel on board, the cruiser’s draft increased by 61 cm, which increased drag and resulted in the drop of speed below the expected 35.5 kt.

The British Airship Carrier HMS Furious is one of the most unusual units of the Second World War.   The ship was designed during the previous conflict as a „great light cruiser” with 457mm guns, but far-reaching changes were made during construction. Furious entered service in June 1917 as aircraft cruiser with a large aircraft deck in the bow and a single turret with a gun of the mentioned caliber in the stern. Thus, Furious made history as one of the precursors of British on-board aviation, becoming a floating platform for various types of trials and tests with airplanes.   It quickly turned out that aircraft deck took up the entire bow part and is insufficient to meet the needs of the day-to-day expanding on-board aviation. Therefore, after carrying out only a few patrols on the waters of the North Sea, the ship was returned to the shipyard in the same year, where it underwent further reconstruction. This time, the aft tower and mast were removed and in their place was built another hangar with an aircraft deck, which was connected to the bow with special platforms running on the sides of the preserved superstructures.   Since then, Furious was already a powerful aircraft, unfortunately not very successful considering the superstructure with a chimney that occupies the entire amidships, which apart from obviously taking up space, caused air turbulences induced by the huge dimensions and warm exhaust gases coming from the chimney.   However, this did not prevent Furious from becoming the hero of the historical event, which was on-board aviation first strike on land targets, which took place on July 19, 1918. The target of the attack was the German Zeppelin base in Tondern, and it was carried out using Sopwith Camel planes taking off from the deck of Furious.

The limited basin of the Adriatic Sea favoured the operation of the light ships and various types of "microorganisms". The Italian naval command at the end of 1914 already drew attention to the combat capabilities of motor torpedo boats. The design of such a unit was presented in November, 1914, by the Italian company Maccia Marchini. The cutter had a displacement of 7-8 tons, a length of 15 meters and was propelled by two engines, 200 HP each. It was supposed to reach a speed of 30 knots. The armament was two torpedoes dropped from both sides. However, the Italian Navy decided not to work with a small and not very well-known company. The fate of the project proposed in February, 1915, by the Venetian company SVAN (Società Veneziana Automobili Nautiche - Venetian Society of Self-Propelled Sea Boats) was different. Torpedo boat designed by engineer Atillia Bisio was somewhat reminiscent of the design of the Maccia Marchini company. It had a similar displacement (7.8 tons) and a length of 15 meters. The drive consisted of four engines with a power of 100 HP each, working on two propeller shafts. The armament was limited to two 450 mm torpedoes and one 37 mm gun.

"Azuma" was one of the six armored cruisers built under the programme. Four of them were built by the British Armstrong shipyard, but "Azuma" was ordered in France, and its sister vessel, the "Yakumo", in Germany. Both cruisers were to carry British guns, making them compatible with units built in hazy Albion. The contract for the construction of "Azuma" was signed on 12th of October, 1897, with Ateliers et Chantiers de la Loire. On 1st of February, 1898, the keel was laid at the concern's shipyard in St. Nazaire. The launch took place on 24th of June, 1899. The construction was completed on 28th of July, 1900. The next day, the cruiser left St. Nazaire and went to Japan, reaching Yokosuka on 29th of October 29 of that year.

The USS Stevens (DD-479) was one of the 175 Fletcher-class destroyers, and was considered one of the finest world War II warships of that type. What set it apart from most of the standard Fletcher-class destroyers was its aircraft-carrying capability. In May 1940 six of the Fletcher-class destroyers were selected for conversion into aircraft-carrying ships. The upgrades included installation of the Mk VI pneumatic aircraft catapult for embarked OS2U Kingfisher float planes.  

"Singing frigates", "Greyhounds of the Oceans" – each of this names contains a little bit of truth about large anti-submarine warfare ships Project 61. Since their emergence until now they are very popular with both: maritime specialists and shiplovers. It could not be otherwise, because they are exceptionally good looking vessels. They were first Soviet units of the new generation, projected and built separate from foregoing schemes. Their uniqueness was not only based on beautiful architecture, but also on some other assets. First of all they were first ships in the world propelled only by the power of gas turbines. Landmark project  

The Russian cruiser Varyag is one of the most exciting and remarkable battleships concerning construction and armament, serving the USSR Navy during the Cold War.   The ship was built in 1979-1989 as one of the four large missile cruisers of the project 1164. NATO designated Varyag as Slava. The battleship has unique shape dominated by the complex of superstructures with electrical equipment system antennas on top as well as SM-248 launchers of the 4K80 Bazalt system along the sides.   The missile cruisers of the project 1164 to which, apart from Varyag, also belong Moscow (ex-Slava), Marshal Ustinov (ex-Admiral Lobov), and Ukraine (ex-Komsomolets/Admiral Flota Lobov) were one of the best in their class at the time with massive firepower. Because of technologically advanced missiles, they were called "aircraft carrier killers," which was related to their primary purpose – destroying American aircraft carriers.  

Destroyers of Project 30bis, also referred to as the Smelyi-class (NATO: Skoryi-class), is a series of 70 Soviet destroyer ships built after the Second World War in the years 1950-1953. It was the most extended postwar series of destroyers in the world.   The ships of Project 30bis were created as a continuation of large destroyers from World War II, which were part of Projects 30 and 30K. However, in comparison to the 30 and 30K project destroyers, the new ships were slightly larger, and their hull was welded entirely. Moreover, the appearance of the superstructures changed, the armament was slightly modified, and more sophisticated electronic equipment was installed. The propulsion system was also modernized, increasing the power of the boilers. The project was developed in 1946 and approved in January 1947. The construction of ships commenced in 1948.   Although the first completed and commissioned on February 5, 1950, destroyer was Bditielnyi (Watchful), the entire series was named after the eighth destroyer Smelyi (Courageous), which was commissioned on March 19, 1950. This ship was used in the Gdansk Bay in the region of Baltijsk, Russia, for both state tests, and project qualifications. On the other hand, in the West, this type of ship began to be referred to as Skoryi-class, after the first identified ship.   The battleships were built in four shipyards: Leningrad, Komsomolsk, Nikolayev, and Severodvinsk. The construction of 85 vessels commenced, of which 70 vessels were completed, and the remaining ones were resigned.  

The construction of large oceanic submarines in the Empire of Japan was related to two basic facts. The first was the achievements in the Atlantic and not only by the German submarines during the First World War. The second one, more important, was the concept of "Decisive battle." For over thirty years – after the Battle of Tsushima – the central strategic concept of the Imperial Navy considered the United States of America as the potential enemy. The Washington Treaty, signed by Japan, limited its capabilities of constructing large warships.   Moreover, it favored the construction of warships by the United States and put the Empire of Japan in a disadvantageous tonnage position. As a result, by the end of 1930, General Staff of the Navy developed a new defense policy, tactics, and strategies that were to apply for the following years. In October 1930, General Staff of the Navy presented a plan for the location of the so-called "decisive battle." In the event of a conflict, the Staff assumed that the first move of the Americans would be to direct their fleet towards the Central Pacific. In the vicinity of the Bonin Islands archipelago (Nanpo Shoto), the American fleet will participate in a classic battleship fight, which will settle the fate of both opponents, naturally, in favor of the Japanese ships. According to the plan, the Imperial Navy's ships will set off against them, which will be divided into four main types of combat units. After the Pacific Fleet has sailed out of the base, the first Japanese combat operations will be launched by underwater submarines and will reduce the number of American units sailing towards Japan. Closer to the west, just before the arrival of American ships into the area of the planned battle, the night torpedo attack was to be carried out by the Japanese destroyers. Then, the battleships would enter the fight and defeat the opponent. The presented concept required the approval of financial resources in the budgetary programs, which were necessary for the implementation of the construction works. They were mainly focused on the development of a new type of long-range torpedo, which could be used as the armaments onboard both the submarines and the surface ships.

The Japanese Navy ordered two new battleships in 1912. They were an improved version of Fuso type battleships. Their construction was included in the equipment plan 8-4 of the fleet (8 battleships and 4 heavy cruisers), which was approved by the government and parliament. The amount of money allocated totaled 80 million yen.   Design work began in 1913 and all funds for the start of word were collected by July 1914. On May 6, 1915, at the Mitsubishi group shipyard in Nagasaki, a keel for the new battleship was laid. On January 27, 1917, the ship was launched receiving the name Hyuga (after the name of the province). On November 1, 1917, Commander Eitaro Shimodairo became the first captain of the battleship.   The Hyuga battleship project was based on the design of the Fuso battleship. Some changes were made to it. The hull was extended by 3 meters, and the armor of the ship's magazines and the central command post were changed. The layout of guns 1 and 2 was changed, which allowed placing the boiler room closer to the bow and fitting the funnels closer to each other. It also allowed putting artillery guns 3 and 4 behind the boiler room. It was not a good choice, because it was necessary to carry the steam ducts to the engine room through the ship's magazines. A better solution was to install the wires under the ship's magazines and over the double bottom.

British battleship HMS Royal Oak secured place in the history books as unlikely hero – sunk as a result of one of the most famous naval operations of the World War II.   German submarine U-47, commanded by G. Prien, after undetected penetration into the Royal Navy Scapa Flow base, sent her down the bottom of the ocean together with the majority of her crew. This was one of the most painful losses of the British fleet during the war. Royal Oak was one of five class “Revenge” vessels, better known as simple “R”, battleships built throughout the World War I. Amongst her strong sides were very powerful main guns, quite good sailing abilities and interesting, “bulky” profile.   “R” battleships have not participated in many of the naval operations of the Great War, as for Royal Oak she took her part in the battle of Jutland.   Between the wars HMS Royal Oak was incorporated into the Atlantic Fleet and Home Fleet. She operated on the Mediterranean Sea during the Spanish Civil War.

The last ship of the first class of German “Dreadnought” battleships was Ersatz Baden/Posen. The keel for Posen was laid on 11 June 1907 at the Germania Dockyard in Kiel and launching followed on 12 December 1908.  The President of the Prussian province of Posen, von Waldow, gave the christening speech and the christening was performed by Fürstin (Princess) Johanna von Radolin. Posen was named after the Prussian Province from 1772 to 1919, and today is known as Poznan province in Poland. On 28 April 1910 Posen was transferred from her construction yard to Kiel Imperial Dockyard and on 31 May was commissioned for the first time. The first pre-trials began on 18 July 1910.