Search found 746 matches

by Thorsten Wahl
Mon Jun 29, 2020 10:06 pm
Forum: Naval History (1922-1945)
Topic: US Battleships
Replies: 8
Views: 238

Re: US Battleships

USBattleships protection characteristics https://attachment.tapatalk-cdn.com/15085/201808/6067558_d90910bc0de9f529d3368f47726b9a2b.pdf?Expires=1593553341&Signature=fwSV1YKFyJSPwscoTan9mA2B1nJznIBAnklhfLcuvpSS~oTHMXare8OSKZX7CACOs3m4ygtrafoVcpajVIBmcWyT5W9CXcvkTYySZgeNdJ1i~pm~qg9Mt0vBAk45iHAYATbCKzaI...
by Thorsten Wahl
Fri May 29, 2020 9:25 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1216

Re: Nagato protection

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.
the .7 number was taken from Navy Depatment Bureau of Ships
by Thorsten Wahl
Tue May 26, 2020 4:34 pm
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1216

Re: Nagato protection

Dave Saxton wrote:
Tue May 26, 2020 4:00 pm
I also have primary documentation on ST52 and D Steel

see my post Thorsten Wahl » Mon May 25, 2020 8:47 am
by Thorsten Wahl
Tue May 26, 2020 11:35 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1216

Re: Nagato protection


Like all designs we have to examine the entire protective scheme, especially as we accumulate more knowledge of AP shell and AP bomb penetration.
Agree.
by Thorsten Wahl
Tue May 26, 2020 9:47 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1216

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 Thorsten Wahl
Tue May 26, 2020 9:25 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1216

Re: Nagato protection

Strangely, despite her weather deck's supposed decapping ability, the KM concluded that the RN 15in could penetrate it over the machinery from about 21k yds and over the magazines from about 27k yds. Against ships with the british 15" gun the KM considered a battledistance of 12 - 18 km as optimal ...
by Thorsten Wahl
Mon May 25, 2020 11:33 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1216

Re: Nagato protection

http://www.kbismarck.org/forum/download/file.php?id=3734 As i said in my earlier reply imperial Elongation is different from DIN-Dehnung (5) Using the same specimen as imperial measurings the 18% "Mindest" Dehnung(5) translates into about 24% Elongation or "as you dont want" ;) 33% according to the...
by Thorsten Wahl
Mon May 25, 2020 8:47 am
Forum: Naval Technology
Topic: Nagato protection
Replies: 38
Views: 1216

Re: Nagato protection

the upper deck on american Battleships was made of STS (sample Iowa class) https://lh3.googleusercontent.com/RzzIg_7vJZubgsiJ8dsD4WEuF7HGOWvXdWJ-kw_Zslof_RShrxIzQJK9EmDUYFuQ2QvDdbBOQy5poyzeCu0JLBobPb3CPN0VaRPKxtKRT0CnYfaoDXJAssAXJJCvnsQKE7izU7B-Qo1hrxNsIrnVtaBh6g8P9dt0ROAo52pvqS3Zgxzl753P1jm6-cPymRH...
by Thorsten Wahl
Mon Apr 27, 2020 8:44 am
Forum: Naval Weapons
Topic: Size of ships and their guns
Replies: 6
Views: 334

Re: Size of ships and their guns

proposed gun caliber for H42 ff. would be 45 cm(C42h) or 50 cm(C42i) guns
Range at 40° Elevation near 50 km. So these guns were'nt practically usable for a considerable part of the possible range.

Image
by Thorsten Wahl
Tue Mar 10, 2020 10:18 am
Forum: Hypothetical Naval Scenarios
Topic: How would you fix the Alaska class?
Replies: 8
Views: 1443

Re: How would you fix the Alaska class?

almost battleship costs within a non battleship.
by Thorsten Wahl
Sat Feb 15, 2020 7:28 pm
Forum: Hypothetical Naval Scenarios
Topic: Vanguard vs. Iowa?
Replies: 16
Views: 9528

Re: Vanguard vs. Iowa?

35.2 knots.
a dream of a ship
by Thorsten Wahl
Fri Nov 22, 2019 8:09 am
Forum: Naval Technology
Topic: HMS Hood's armour layout
Replies: 21
Views: 8840

Re: HMS Hood's armour layout

have a question the british protection charts listed marylands deck armor as consisting of 5 1/2 inches of deck armor giving protection against ballistic attack up to about 27,000 yards. as far as i know the deck protection consists of the -second deck laminate made of 60# STS over 60# NS and -splin...
by Thorsten Wahl
Mon Nov 18, 2019 12:47 pm
Forum: Naval Weapons
Topic: American SH shells - Famed or Folly
Replies: 33
Views: 8286

Re: American SH shells - Famed or Folly

british comment in SUPP 6/481
SUPP 6-481 _section_Effect of weight.jpg
SUPP 6-481 _section_Effect of weight.jpg (37.21 KiB) Viewed 901 times
by Thorsten Wahl
Tue Nov 12, 2019 2:35 pm
Forum: Naval Weapons
Topic: Fuze delay in aerial antiship bombs
Replies: 5
Views: 594

Re: Fuze delay in aerial antiship bombs

Instructions for the use of bombs against ship targets ZahlentafelBomben.jpg penetration capabilities dive attack =500 km/h, throwing height 1,2 km, impact angle 60° (90° = perpedicular to plate) impact speed about 280 m/s for all (RS =rocketdriven) PC 500 RS 190 mm PC 1000 RS 180 mm PC 1800 RS 180 ...