Search found 3970 matches

by dunmunro
Fri Aug 14, 2020 2:04 am
Forum: Bismarck General Discussion
Topic: Was the battleship Bismarck really the best of its time?
Replies: 34
Views: 1600

Re: Was the battleship Bismarck really the best of its time?

Yes, I understood your point, except I didn't understand why the Swordfish was the only aircraft capable of operating that radar. I also wasn't aware that the specialized night Catalinas had it. I'm still learning. Do you know by any chance how many ships were torpedoed at night by Swordfish? Would...
by dunmunro
Thu May 28, 2020 7:09 pm
Forum: Naval History (1922-1945)
Topic: Damage to German warships in Brest
Replies: 13
Views: 776

Re: Damage to German warships in Brest

:ok: :ok:

Interesting data.
by dunmunro
Thu May 28, 2020 4:58 pm
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

For a discussion of multiplate laminated armour see:

http://www.navweaps.com/index_nathan/mu ... ePlate.php

Okun's rule of thumb is to take the effective thickness of a laminated plate as .7 x the thinnest plate + the full thickness of the thicker plate.
by dunmunro
Tue May 26, 2020 6:35 pm
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

Hello, to Mr.Dunmunro writing: ". ..your stubbornness in refusing to acknowledge the totality of KGV's deck... " I am extremely disappointed to see these kind of personal comments, especially as I would have so much to say regarding the same attitude from your side. I have no problem admitting my m...
by dunmunro
Tue May 26, 2020 10:33 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

This is from an RN study comparing KGV and Tirpitz's magazine protection: to be exact it#s from C.B. 04039 (2) (20 th July 1942) Addendum No 2 to C.B. 04039 ARMOUR Protection, 1939. For both armor schemes the britsh recommendations left out the upper deck as having any protective effect. In the ger...
by dunmunro
Tue May 26, 2020 9:31 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

Hello Mr. Dunmunro, you write: " it states a Brinell value of 170 for 'D' steel. ": only for post WWII D steel, not KGV one. and: " ...compares very well with the average nickel-steel armour given in the same table ": table refers to 1890-1925 steel, not the nichel-chrome-molibdenum WWII (e.g. the ...
by dunmunro
Tue May 26, 2020 1:42 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

Hello Mr.Dunmunro, I am afraid I have given you the values of tensile strength demonstrating that D steel cannot be considered even close to an armor grade steel, the same concept Mr.Wahl explained to you. ST52 steel (the one used for mere hull plating of Bismarck) had hardness of 150 Brinell and t...
by dunmunro
Mon May 25, 2020 7:09 pm
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

Hello, to Mr. Dunmunro writing: " .0805 calibre plate thickness begin to be effective for decapping at high obliquity" Another interesting aspect on which we can agree to disagree: it surely depends on obliquity, but other sources speak of up to almost 0.2 calibers to get de-capping at 90° impact a...
by dunmunro
Mon May 25, 2020 9:37 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

the upper deck on american Battleships was made of STS Comparison D-Steel vs St-52 comment imperial-Elongation and DIN-Dehnung (delta5) are not comparable as the german specification uses a relatively longer specimen D Steel an armour grade material??? wishful thinking IMHO There were different gra...
by dunmunro
Mon May 25, 2020 9:20 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

Hello Mr.Dunmunro, "D steel was armour grade": here we can agree to disagree. It may have been used by some Navies for protection in some schemes (mostly when better steel was unavailable and/or only as splinter protection) but it does not have hardness and tensile strength quality (see the data I ...
by dunmunro
Mon May 25, 2020 5:02 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

This is a schematic of the armour over the KGV (Its from the Lion class in Allied Battleships but KGV was the same) magazines: The placement of the splinter protection, and the distance from the MAD to the magazines adds considerably to the protection of the magazines, as a shell or bomb is likely t...
by dunmunro
Sun May 24, 2020 9:40 pm
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

Hello Mr.Dunmunro, D steel is a naval construction steel, not an armor grade steel, having hardness and tensile strength (around 50 kg/square mm) inferior to armor grade ones (e.g. German Wh n/A (85 kg/square mm), not even comparable to Ww n/A (70 kg/square mm), used for torpedo bulkhead and splite...
by dunmunro
Sun May 24, 2020 9:43 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

Hello Mr.Dunmunro, KGV non armor grade steel layers (or construction steel over which armor deck is simply posed) are not counted for protection effectiveness, not being able to de-cap an APC shell and not adding any protection against an intact shell body. I do not know if SD and Iowa 38 mm weathe...
by dunmunro
Sat May 23, 2020 11:51 pm
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1701

Re: Nagato protection

KGV had a 30mm weatherdeck, a 150mm over 12.5mm D steel MAD and then a 38mm splinter deck over the magazines, with several 12mm decks between the armoured decks.

Over the machinery there was a 30mm weatherdeck, and a 122mm MAD over a 12.5mm D steel deck.
by dunmunro
Sun May 03, 2020 8:14 pm
Forum: Naval History (1922-1945)
Topic: Admirals Bridge on King George V Class Battleships
Replies: 7
Views: 581

Re: Admirals Bridge on King George V Class Battleships

The drawing on this page shows the compass platform, where Captain Leach was stationed:

http://www.hmshood.com/history/denmarks ... amage1.htm