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Thanks for Your inputs, wavelength and welcome on board.
I may add that the armoured weatherdeck received a slightly different chemical treatment than the lower ballistic armoured deck in SCHARNHORST, BISMARCK-; and HINDENBURG-class ships. According to post war shooting trials carried out by the british on captured plates from TIRPITZ, the BHN level was about 10% higher for the 50mm thick plates. This had benefitting effects against cruiser fire but also helped to decap enemy projectile caps under difficult conditions. Scaling effects caused by these hard plates prevented the utiliztion of 250 BHN+ plates for the main armour deck. While homogenious, the KM was reluctant to use these treatment for any plates over 50mm thickness, when toughness becomes a more important aspect than hardness.
I think that thickness of the plates generally has a lot to do with plate resistence. The germans, italiens and british were reluctant to use 360mm+ plates for any shipboard application. The japanese and americans were not but their plates suffer from poor scaling effects.
best regards,
The 50mm plates averaged 230 brinell, while the 100mm, 80mm, and 120mm plates from the panzer deck averaged 250 brinell. This equates with a tensile strength of 80kg/mm2 (117,000 psi), for the upper deck, and 90kg/mm2 (130,000 psi) for the panzer deck.
I take it that You have read parts or the whole document. Do You happen to have a copy of this source? I ask deliberately because I have my problems accepting the following issue:
In fact, this result contradicts the UK tests of the same material which D. Saxton has come across so far. The UK test showed the upper deck to have avg. 250 Brinell (85 to 95 Kg/mm^2) while the lower Panzerdeck had 225 to 235 Brinell (80 kg/mm^2). This is a quite serious point of departure in both sources. From my understanding -and I might be wrong- german Wh if treated to a hardness of 255 Brinell had a strain of 20% (minimum acceptance limit = 18%) while the same material treated for only 225 Brinell got a strain of 25/6% (minimum acceptance limit = 23%).
For the thicker Panzerdeck a material with high strain is the preferable application. Thinner plates could be treated for higher hardness without a significant drop in strain. The 30mm samples from TIRPITZ in UK tests are much harder than the 50mm deck plates too (probably for splinter bulkheads).
best regards,
Hello Wavelenght
According to Garzke Dulin, the 14" from DoY hit Scharnhorst's sbd side abreast of turret Anton not the turret itself. Did the German BB main armament turrets have ready use ammo during WWII? IHO, not being BB specialist, British turrets didn't have. IMHO if flooding was done promptly, some flaming charges would not developed into conflagaration, especially because German charges were more stable and in metal cartridges. So after pumping B magazine dry the firing could continue. It seems that in A magazines there was conflagaration but not in B-magazines, that is according to Garzke Dulin.
As I wrote in my message #670 "On British heavy shells, at least those 15" shells which hit Dunkerque at Mers-el-Kébir worked OK", I didn't claim that those 15" shells did something exeptional, only that they worked as advertised.
Juha
The Barents Sea outcome did not boil down to technical capabilities, it was the results of the errors in judgement and good judgement by humans. BTW, its not correct that Luetzow didn't score any hits. It damaged two frieghters and seriously damaged the destroyer Obdurate with radar directed salvoes from 16,000 meters range.
That´s explainable by the increased accuracy and the different environment of firecontroll post war. I can assure You that the closest you could come with ww2 era firecontroll is hitting at direct fire only (no FC required, only point blanc range) or -most usual- straddling at anything else involving FC. With a mean salvo deviation of +-200 yards and more in range (68% of all falls are in within this distance to the MPI), there is simply no possibility to ask for a hit. You either straddle a target or You adjust the MPI acordingly to straddle. The hit on the other hand is a random event in within the probability limits of the straddle itselve. You may manipulate the probabilities a bit (that´s why half salvos are preferable to full salvos), but You can´t tighten the dispersion pattern beyond the limits of the gun / turret / projectile / propellant combination. The dispersion pattern for major calibre projectiles at realistic fighting range, however, is always much larger than any ship buildt in ww2.To me, and to the people that trained me, the measure of success is not the number straddles, but the number of hits over the total number of salvoes fired.