Naval History Forums

@Herr Nilsson, the 270 RPM value for Bismarck/Tirpitz refers -coincidentally- to a speed of about 30,2 kn of the Bismarck Meilenfahrt? is this correct? additional edit: according to MDV 371 or the Oberbaurat Krux Memo the Marine Wagner Boiler consumes 3,950 kg fuel oil (at äußerste Last) to produce ...

Scharnhorst's and Tirpitz' turbines were of similar design, but Bismarck's was very different. According their manuals Scharnhorst and Tirpitz had a very similar (almost identical) steam consumption per SHP You meant the consumption drawings in Kriegserfahrungen...Oberbaurat Krux? Power RPM ....ste...

ballistic test of a PC 500 Bomb vs 120 mm Wotan hart impact Speed 186 m/s simulated divebomb drop from 1300 m height with aircraft speed 500 km/h PC 500d.jpg the casings of german PC and PD (armor piercingt bombs) bomb were sufficent to survive impacts at least from throwing heights of 4000 m comple...

In terms of propeller design is concerned, overall efficiency tends to go up as one moves towards fewer and larger propellers with larger numbers of blades rotating at slower speeds. That is another question I have, and already mentioned, why did they go to 270 rpm propellers when other naval power...

Hello everybody, What was improved in Bismarck's boilers/machinery vs Scharnhorst's ? Wasn't the Bismarck propulsion plant (including the boilers) basically the same as Scharnhorst's ? Whitley mentions a pressure of 58 kg/cm2 @ 450° for Scharnhorst too... Bye, Alberto Bismarcks machinery was more s...

Folks, the Richelieu's machinery gave 155,000 shp on 4 shafts and the machinery weighed 2875 tons (=53 shp/ton). Steam conditions were 27 kg/cm2 and 350 deg C. Bismarcks powerplant weights about 3,300 tons therof about 2,800 tons machinery and about 500 tons feedwater and fuel oil in piping. Despit...

according to the knowledge of the time 3 screw propulsion had a better propulsionefficiency compared to a 4 screw system. older german transcription from "the Engineer" 1914 3 Welleneffiziens5.jpg Prior to WW2 the Germans said, that a 3 screw ship requires about six percent less propulsionpower for ...

its a mistake

the facehardened armor in shipbuilding was mostly from cemented type,
Vehicles wich used facehardnend armour used homogenous armour but face hardened on one side but without cementing.

weldability of steels mostly depend on C-Content and some other alloys.

Original is of low quality its a comparison showing areas of superiority of armour piercing capped(APC) or armor piercing(AP) shot (90 mm) of the same type at different t/d vs obliqity for a certain quality of armor above dashed line APC superior below dashed line AP superior Abcissa obliquity above...

hatched area from A954868 COMPARATIVE Effectiveness of armor defeating ammunition available at DTIC.mil depending on head shape, hardness of projectile vs hardness of plate, size of the cavity for the explosive ... the area can differ, ther are kumulative effects and at different obliquity/speed com...

radius of destruction is (appears) approximately equal to the cube root Yes and its modified by the type of explosive (aluminized explosives for instance produce more bubble whipping(have no better explanation)wich breaks up structures more easily over relatively larger distances instead of pulveri...

Damagesummaries for german ships Scharnhorst https://drive.google.com/file/d/0B12aaMD-x_k_TGdDOG5nNU91alE/view?usp=drivesdk Lützow https://drive.google.com/file/d/0B12aaMD-x_k_YTF4NFhyMXBVSUE/view?usp=drivesdk USN Damagereports https://www.history.navy.mil/research/library/online-reading-room/title-...

The mention of the paper by Hoyer has drawn my attention to something I had overlooked before. Namely, I had thought that the curves Vg in Figs 12 and 13 were curves of terminal velocity (from its shape) rather than of the velocity at which the shell fractures on impact. Also generally in GKdos 100...