One of the warships where one can see how fast in those days the design evolved are the Deutschland
class heavy cruisers. I take some lines of Wikipedia just to put the ship in context, as well as a drawing of two SB members (because better it could not be done and as I think you all know my main goal is the context these ships were built for and where do did they fit into my AU.
class was a series of three "Panzerschiffe" (armored ships), a form of heavily armored cruiser, built by the Reichsmarine officially in accordance with restrictions imposed by the Treaty of Versailles. The ships of the class, Deutschland, Admiral Scheer and Admiral Graf Spee, were all stated to displace 10,000 long tons (10,000 t) in accordance with the Treaty, though they actually displaced 10,770 to 12,540 t at standard displacement. Despite violating the weight limit, the design for the ships incorporated several radical innovations to save weight. They were the first major warships to use welding and all-diesel propulsion. Due to their heavy armament of six 28 cm guns and lighter weight, the British began referring to the vessels as "pocket battleships". The Deutschland
-class ships were initially classified as "Panzerschiffe" but the Kriegsmarine reclassified them as heavy cruisers in February 1940.
The three ships were built between 1929 and 1936 by the Deutsche Werke in Kiel and the Reichsmarinewerft in Wilhelmshaven. Actual design work on the new type of armored ship began in 1923, but the German economy collapsed in 1924, forcing a temporary halt to the work. Admiral Hans Zenker, the commander in chief of the Reichsmarine, pushed hard for the navy to resume design work, and in 1925 three new proposals were drafted, in addition to two sketches prepared in 1923. The Reichsmarine held a conference to evaluate the designs in May 1925, though the results were inconclusive. The initial design for Deutschland, ordered as "Panzerschiff A", was then prepared in 1926 and finalized by 1928. The Reichsmarine had decided that the new ships would be armed with two triple turrets mounting 28 cm guns.
Political opposition to the new ships was significant. The Reichsmarine therefore decided to delay ordering the ship until after the Reichstag elections in 1928. The question over whether to build the new ships was a major issue in elections, particularly with the Social Democrats, who strongly opposed the new ships and campaigned with the slogan "Food not Panzerkreuzer." In May 1928, the elections were concluded and enough of a majority in favor of the new ships was elected; the first of the new ships was authorized in November 1928."
Five years spent for deciding if the ships were to be built or not and if yes, which concept should be choosen. Really, after the defeat in WWI some years before, noone in Germany ever thought of the posibility these ships could serve in another and even deadlier war... I mention this here to show why these ships were built and commissioned throughout the 30s but in reality they were conce3ived with the tecnology of the 20s, although they had two major innovations: they were welded instead of the traditional riveting, which by itself represented a weight saving of some 15%! Then, they were the first big ships with an all-Diesel propulsion, as the records say another significant factor for weight saving. The engines were four sets of 9-cylinder, double-acting, two-stroke diesel engines built by MAN and paired by two on two shafts driving screws with 4,4 meter in diameter. Total power output were 53.260 shp, allowing the ships to reach top speeds slightly under 30 knots. Electricity (220V) was supplied by four electric generators powered by two diesel engines. Due to the all-Diesel propulsion, the range of these ships averaged 10.000 nautical miles at a speed of 20 knots.
The dimensions of these ships were 181,7m x 21,6m x 7,25m at full load (5,80 standard draft). The displacement, as said above, varied between 10.800 t and 12.540t at standard weight. At full load the displacement increased on all three ships by some 4.000 tons on average.
"Deutschland's primary armament was six 28 cm SK C/28 guns mounted in two triple gun turrets, one forward and one aft of the superstructure. The ship carried a secondary battery of eight 15 cm SK C/28 guns in single turrets grouped amidships. Her anti-aircraft battery originally consisted of three 8.8 cm ("acht-acht") L/45 guns, though in 1935 these were replaced with six 8.8 cm L/78 guns. In 1940, the 8.8 cm guns were removed, and six 10.5 cm L/65 guns, four 3.7 cm guns, and ten 2 cm guns were installed in their place."
So far to the real history of "Panzerkreuzer DKM Deutschland". Next comes a theme, regarding "Deutschland", which puzzles me a lot...
Edit: Mystery solved... "Deutschland" and her two sisterships had different front superstructures and conning towers. "Deutschland" had a round shaped bridge and main mast, "Admiral Scheer" and "Graf Spee" completely different pyramid shaped conning towers and lower superstructure.
As the design above correctly shows.
Now one of her sister ships:
This puzzles me indeed.