Naval History Forums

the Seetakt Fumo 23 and 26 were able to be used also in a passive mode called FUMB - Funkmessbeobachtung
prerequisite enemy radar was using the observed frequency

typical Herr Nilson :whistle: looking at http://www.navweaps.com/Weapons/WTGER_WWII.htm for the German torpedos there 21" ones had 300Kg Hexanite warheads. (it notes that conflicting data exist on the actual warhead weight.) Hexanite is ~7% more powerful than TNT. german torpedoes contain Schie...

after short measure my estimate in the size of the boiler room was something underrated

Boiler Room 2 size 13,5m x 7,5m x 8m ~810m³
Electricity Plant 4 (i forgot in the other post) size 8,5m x 7,0m x 4,0 m ~238m³

TDS 2 X void spaces sum 2,0m x 5,5m x 13,5m ~143 m³

The area outwards of the BS-torpedobulkhead was divided into 20 watertight sections in between 5,5 m - 8,5 m lenght each roughly 40% of the space at the TDS was empty to accommodate detonation gases - average empty space roughly 82,5 m³ per section A detonation of a torpedo with a 300 kg TNT warhead...

The implications, IMO, are taht Richelieu could take more concentrated torpedo damage, while Bismarck could take more torpedoes spread along the length of the ship. No, any single hit on a segment of the torpedoprotection system will render this segement and probably adjacent segments potentially i...

The battery deck was nonballistic at 6mm. And wasn't there a 20mm deck between the upper and panzer deck at all .. ? (regardless of the name) The upper platformdeck in front of the bow transversale bulkhead (Frame 202,7- 233,0)was made of 20mm Wh. It offers splinterprotection against medium caliber...

if someone may investet $ 31,50 to a more modern study about yawed impact on thin plates http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V3K-3Y5FP5P-10&_user=10&_origUdi=B6V3K-47YBJ6K-R&_fmt=high&_coverDate=06%2F30%2F1995&_rdoc=1&_orig=article&_acct=C000050...

I noticed in the file gsap_088 (part of the zip package linked by Thorsten) it states something to the effect that a plate thickness of .2 D required to decap a projectile. Now some latter infromation shows that this is very conservative but it implies that the the deck if it was designed to decap ...

But Thorsten should be able to tell us what he meant... I differenciate between "deflection towards plate normal additional - reduces the efficiency of plate 2" deflection.jpg and "Additional some kind of yaw could be introduced, this means direction of flight differ significantly fr...

First of all the Krupp formula is a tool for calculation of a penetration, it is not physical exact, but it is able to present the expected result of a certain pentration witout beeing to complicated with sufficient accuracy especially for german projectiles, It was not expected to explain all possi...

some thougts on effectivenes of spaced armor according GB and US reports. AD A954 865 Spaced Armor 1950.JPG decapping gb.JPG The theory behind you can find at http://www.bismarck-class.dk/ http://www.bismarck-class.dk/miscellaneous/naval_archive/german_navy/steel_ap_and_theory_of_penetration_1946.zi...

The excelfile file can be found here
http://www.kbismarck.org/GKdos100-Krupp ... formel.xls

Many thanks to Jose

Thanks, but how to gain access to your file? Unfortunally direct link didn't work for unregistered users and I don't know German. -Durchschlag - pentration at given angele and impact speed Can you explain what means the term "penetration" in this case? Is it complete penetration or "...

Bill your explanation is not correct the moment of inertia for a cylinder is J=1/2m*r² so it depends on the radius at the square and mass by 1/2. By increasing length you are proportionally increasing mass and also increasing proportionally the (stabilising)moment by 1/2 of the increased mass, but a...

alecsandros wrote:Hi Thorsten,
I presume the face-hardened and homogenous armor thicknesses mentioned are German KC n/A and Whotan, respectively ?

yes