Naval History Forums

The nose shape (of the main body -not the cap) was found by the USN and the Germans prior to the war, and further confirmed by the British later, to be of extreme importance to oblique penetration performance. The French engineers would likely expect that such performance could not be obtained at l...

Yes, it's intriguing how a shell could defeat so much armor given the circumstances... There was also another 406mm shell (the 5th strike) which perforated 16 + 18 + 8 + 13 + 15 + 100mm of steel on Jean Bart's stern, allthough I don't know if the steel was armor grade. the problem were the very thi...

if pentration occurs through whether and armored deck(50mm + 80mm) the ballistic resistance is expected to be somewhat lowered compared to an single plate of same thickness(130 mm) as pentration ability of the bomb is probably not affected by the first plate

I pretty sure german optics of the WW1 timeline were somewhat better than their british counterparts. I remember reading about a british offer via a neutral country regarding sniper optics for rubber. Incidentally my textbook is from the end of the fifties. Hence it should include also summarised kn...

From a textbook of optical measurements procedures "A comparison of stereoscopic rangefinder with other optical rangefinders shows that all procedures are based on the same geometric basis. Thus they were of same accuracy in general. Stereoscopic measurement has the advantage, that the accuracy...

A piece about casualities of Sherman tank suffered by 7,5 cm and 8,8 cm guns
http://www.wlu.ca/lcmsds/cmh/back%20iss ... 201944.pdf

12 ships were on the list
Weather ships
Freese, München, August Wriedt, Lauenburg

U-boat supplier
Gedania, Egerland, Alstertor

Fleet tanker
Belchen, Gonzenheim, Esso Hamburg, Breme, Lothringen

Blockade runner
Babitonga

May 10th 1940

ORD 653 pentration curves 1942 predicts ~16.6 inch at 22 kyard for the US 16" 45 gun 2700 lb projectile against US Class A GKdos 100 predicts 16.1 inch at 22 kyard for the german 38 cm Panzergranate m BdZ against german KC na. if we believe in a ballistic advantage of german KC nA of about 5 %,...

But Bismarck is 10 feet wider in beam, which makes their overall target footprints equal for all practical purposes. ther is a little comment I have to made. even bismark was 36 m wide it doesnt mean that you are able to in every case of potential deck perforations to hit something important about ...

The two vessels spot each other on radar at about 35,000 yards the american captain wasnt aware about the radar detection equipment on board as Tirpitz was receiving pulses from the US radar. Therfor combat readines was commanded several minutes before a blip was seen on the scope. in between 35 ky...

german research conclude from thir results that plate support was mostly negligible. They shot 15 cm AP-projectile at 460 m/s against plates with heavy steel construction support (ca 24 tons) no support http://www.kbismarck.org/forum/download/file.php?id=389 their general finding was that was practi...

Nathan Okun has postet some data for the 14 " Mark 16 mod 4 projectile http://www.navweaps.com/index_nathan/Armor_Penetration_of_USN_14in_Mark-16_Mod-4_AP.pdf even its definately not easy to derive an angular performance from this data but it's possible to obtain some interesting informations <...

It´s still a remarkable performance - 0.98 cal penetration* CA at 30 deg obliquity and 476 m/s. Similar performance of the 38cm L4.4 APC was 0.9 cal KC at 30 deg and 500 m/s (altough the definition here was different requiring the projectile to either completely penetrate in a broken condition or t...

ADM 281/40 Comparative performance of old (Rodney 1923) armour with modern (1946) armour