Search found 708 matches

by Thorsten Wahl
Mon Jul 01, 2019 12:28 pm
Forum: Naval Technology
Topic: Yamotoand Mushashi
Replies: 13
Views: 5724

Re: Yamotoand Mushashi

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.
by Thorsten Wahl
Wed May 22, 2019 10:20 am
Forum: Bismarck General Discussion
Topic: On the Origins of Scaling
Replies: 13
Views: 544

Re: On the Origins of Scaling

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...
by Thorsten Wahl
Wed May 22, 2019 8:38 am
Forum: Bismarck General Discussion
Topic: On the Origins of Scaling
Replies: 13
Views: 544

Re: On the Origins of Scaling

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...
by Thorsten Wahl
Wed May 22, 2019 8:04 am
Forum: Naval History in General
Topic: Need help with WW2 Torpedo performance.
Replies: 11
Views: 950

Re: Need help with WW2 Torpedo performance.

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...
by Thorsten Wahl
Tue May 21, 2019 9:26 am
Forum: Naval History in General
Topic: Need help with WW2 Torpedo performance.
Replies: 11
Views: 950

Re: Need help with WW2 Torpedo performance.

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-...
by Thorsten Wahl
Tue May 07, 2019 9:23 am
Forum: Bismarck General Discussion
Topic: Some questions regarding Bismarck's armor scheme
Replies: 17
Views: 911

Re: Some questions regarding Bismarck's armor scheme

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...
by Thorsten Wahl
Mon May 06, 2019 2:44 pm
Forum: Naval Technology
Topic: German Radar
Replies: 40
Views: 14342

Re: German Radar

detection capapilities (as measured) of Funkmess equipment as per 01/41 used device on board Prinz Eugen the device on bord Prinz Eugen consists also of a N.V.K. - P-Zusatz 11/40 ( Seite fein) which allows accurate measurement of the azimuth even without optical visibility ranges landmarks up to 75 ...
by Thorsten Wahl
Fri May 03, 2019 12:52 pm
Forum: Bismarck General Discussion
Topic: British postwar tests on armor
Replies: 82
Views: 2658

Re: British postwar tests on armor

... re annealing: yes any heat threatment to FH-armor produces scrapmetal re Turret a lifted they did not directly say when the turret was liftet, as it was mentioned in different paragraphs. But from wording it appears to me the lifting happened shortly after the bombexplosion at 11:15 p.m. paragr...
by Thorsten Wahl
Fri May 03, 2019 11:10 am
Forum: Bismarck General Discussion
Topic: Some questions regarding Bismarck's armor scheme
Replies: 17
Views: 911

Re: Some questions regarding Bismarck's armor scheme

1) the heavy belt + sloped armor deck combination is "optimised for all combat distances". Additionally the torpedobulkhead acts as debris catcher depending on AOF any shell has to penetrate at least about 550 mm armor grade steel to get into the citadel area. the protective effect is more pronounce...
by Thorsten Wahl
Fri May 03, 2019 9:35 am
Forum: Bismarck General Discussion
Topic: British postwar tests on armor
Replies: 82
Views: 2658

Re: British postwar tests on armor

Edited: A british 2000 lb AP bomb had about ~80 kg explosive content. In a contact detonation this amount seems sufficent to open a 105 mm armor plate at least 2-3 m wide. A left open hatch is not necessary But wat was the reason for the second? forward detonation half an hour later. the overpressur...
by Thorsten Wahl
Fri May 03, 2019 7:30 am
Forum: Bismarck General Discussion
Topic: British postwar tests on armor
Replies: 82
Views: 2658

Re: British postwar tests on armor

Text shortend for relevant informations Telex 27.02.1942 first Bomb hit 11:15 p.m. height Anton loss of anton crew and leak defense group V Fire in turret Anton and surrounding camouflage material shortly after this flame from turret Anton possibly from cartridges with disruptive discharge to Bruno ...
by Thorsten Wahl
Thu May 02, 2019 10:25 am
Forum: Bismarck General Discussion
Topic: British postwar tests on armor
Replies: 82
Views: 2658

Re: British postwar tests on armor

Herr Nilsson wrote:
According the German short report from February, 28th 1942 the armoured deck was knocked open and destroyed. There is no mention of any hatch.
Marc do you have the original Nara reference?
Would like to read.
by Thorsten Wahl
Thu Mar 14, 2019 4:31 pm
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 18943

Re: PoW's gunnery VS BSM's gunnery

regarding shell output of Bismarck there are different phases within the battle. shooting in (Einschießen) against Hood fire for effect against Hood target change to POW Shooting in (einschießen) against POW fire for effect against POW POW turns and makes smoke the smoke accumulates in the line of s...
by Thorsten Wahl
Tue Mar 12, 2019 7:18 pm
Forum: Bismarck General Discussion
Topic: PoW's gunnery VS BSM's gunnery
Replies: 515
Views: 18943

Re: PoW's gunnery VS BSM's gunnery

still showing that the "green" PoW had the pool of personnel in the royal navy was significantly larger than it was the case in the Kriegsmarine, the core of personnel came from older battleships. So a "green" crew appears questionable. Both german crews were also "green" in this context. @wadinga ...