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I am also not sure what exactly the RADAR capabilities of SCHARNHORST and IOWA in late 1943 were. I understand that both ships had RADAR sets efficient enough to track an enemy BB-sized target and develop gunlaying solutions for the firecontroll using RADAR. I also understand that the US later build in a radarset to track gunsplashes which the DKM sets could not. I am not sure if this holds true for late 1943 as well. If so it would create a notable advantage for IOWA.
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Hello Soren
the 335mm penetration for 11in at 15km isn't test result but is from "Battleships: Axis and Neutral Battleships in World War Two" for a muzzle velocity of 2,920 fps (890 mps) and is based upon the USN Empirical Formula for Armor Penetration.
The data based on the pre-war Krupp test shoots on their range in Meppen with L/4,4 APC projectiles using RPC/32 propellant against KC-type armor at an impact angle of 70 degrees gives 11in shell penetration at 15km as 11.02in / 280mm. But it should be noted that RPC/32 propellant was replaced by the more powerful RPC/38 type which was the only propellant used in World War II, so that is somewhat undervalue.
Juha
PS it seems Parsifal just beats me.
I personally doubt that SH was slowed by a hit penetrating a boiler room, because of the chronology. Nearly 15 minutes had passed after the DoY was forced to cease fire and before Adm Fraser called off the pursuit. It was further several minutes after Adm Fraser called off the pursuit before the British radar operators began to call off decreasing ranges, and they knew that SH had been delivered into their hands. Some of the German engine room personal later stated that the loss of speed was because of a broken steam line to one of the turbines. This is plausible considering that the Scharnhorst had its machinery pushed beyond proper limits for many hours at that point.
I don't recall the SH 's 28cm performance but it really won't be too far behind. This is because penetration of cemented armour by large caliber shells is mainly a matter of velocity rather than caliber or weight. The American 16" doesn't have much better belt penetration because of its relative low velocity. It hardly matters anyway because of the belt plus slope design of the German ships can't be dfeated at virtually any range.
But SH had a major problem with it's thin 45mm upper Belt, up from 18500-19000m, because every huge (up from 11-12inch) shell can strike through the upper belt and go directly to the main deck, which is also thin with 80mm.
SH had the best immune zone under 18000m from all Battleships ever build (accept her turrets) but up from 18000m it's fragile and SH isn't a balanced design because the battle range at WWII was 15000m-25000m.
Also the the german naval weapons were all designed for belt penetration (huge muzzle velocity; light shell) rather than deck penetration, so to fight against an other battleship SH must go to an infight (under 18000m) to play it's good parts (belt penetration power and belt plus slope design).
For the radar equipment on SH for my opinion it was not a radar fire control equipment. By radar you can find ranges and integrate them in the gunnery solution but you couldn't opperate the SA of SH only by it's radar equipment.
For my understanding the MK 8 and the british fire radar equipment could opperate their SA only by radar and for the battle of Nordcap it was the key to win because there was any daylight and the british ships were equiped with flashless powder.
The German designers also found the SH upper belt, if it can be called such, a major flaw. They always considered the Bismarck's upper belt of 145mm KC a major improvement.
It was not realistic to attempt to provide complete protection to turrets and barbets at battle ranges below about 20km. In most cases the turrets were designed to provide protection from 20km-30km battle range. It's no surprise that the Bismarck's B turret could be knocked out by a 16" shell from Rodney at ranges of slightly less than 20km, or SH's A- turret being knocked out at 11km by a 14" shell.
The Germans did not use light shells per caliber to enhance MV, although it did, but to concentrate the shells center of gravity in the head and to retain a center of gravity near the shell head should the hard penetrating cap become removed. This greatly enhanced the shells ability to penetrate intact during oblique attack. They therefore used relatively short body shells with medium sized burster cavities. This concept can be illustrated by British tests of their battleship AP shells postwar. The short body Nelson class 16" shells always penetrated intact striking at 30*. But the longer per caliber 14" and 15" shells usually did not. If the shells center gravity is too far away from the head it would likely become broken up during oblique penetration. Removing the cap shifts the center gravity away from the head of the projectile in heavier per caliber shells that have relatively long shell bodies. This was good reason to use a deck protection system that always de-caps. This is also why in the case of heavy shells against the German de-capping deck systems it gets very complex, and is not any kind of a slam dunk for the heavy shells to defeat the German deck system intact at realistic battleranges.
I agree that the SH 28cm gun was just too weak to take on WWII battleships in most cases. The Tirpitz's 38cm gun was far more capable. The ballistics of the 38cm gun is most interesting. It has a flat trajectory and great terminal velocity at ranges where it will likely strike an enemy's belt. But because of its relative lightness and the lesser amount of momentum it carries down range compared to a heavier shell, it begins to obtain steeper final trajectories at the battle ranges that it more likely to strike decks. Compared to the heavier French 38cm with an angle fall of 25*, and 115mm deck penetration at 30km, the German 38cm has a 31* angle of fall and 128mm deck penetration at 30km. The Iowa's 140mm effective deck protection could be defeated by the German 38cm by about 31km battle range.
I don't know if the SH 28cm gun can defeat the Iowa's deck protection at any realistic battle range?
Hello Wavelenght
On the other hand their description of what happened to A-turret and magazine is in line of the Gödde's story, whose battle-position was, if we can believe his interview in The Scharnhorst double-DVD, alongside and inside the conning tower.
On Hood's 15" shells hitting on Dunkerque, the one which hit on the 150mm roof of the13" Turret II, even if hit angle was shallow, gouged deep into the armour plating before exploding, most of the shell ricocheted but pieces of armour or of shell struck the loading platform and started a cordite fire which killed the entire gun crew of the starboard half turret. The hole in the roof armour was something like 1,5m x 20-30cm.
Juha
I'm not following what your trying to say here parsifal. Can you provide any examples to make your point(s) clearer??