Okay, first result, with grenadage at 1940:
above -130 meters, my sub takes some serious damage in one pass. The ballast tanks are ripped open, I sink to the bottom.
At -130m, it takes two/three passes to damage the submarine enough to sink it. One pass damages me, but moderately.
At -135 meters, no damage.
Test protocol: submarine at half speed, I make a circle while the DD picks me up.
I consider the test conclusive if the submarine gets away with no damage after one hour.
For grenadage at, nothing to do, even at -235m (very close to the submarine's breaking point), I get severely hit by the grenades.
I wonder if the depth charges haven't been buffed by the modders...
http://www.navweaps.com/Weapons/WAMBR_ASW.php#Mark_VII
In 1939, the Mark VII had a maximum depth of 91m:
The link indicates a depth of 500 feet (182m) for a later version, with no date indicated. Any ideas?
http://www.navweaps.com/Weapons/WAMB...Mark_VII_Heavy
The mark VII heavy debuted at 1940 and only increase the rate of descent of the Mark VII.
http://www.navweaps.com/Weapons/WAMB...2A_and_X%2A%2A
In 1942, the first version of Mark X made its debut. It was slow to descend and had to be launched from a torpedo launcher. The indicated depth of 220 feet is really insufficient against uboats that have had time to submerge deeply.
http://www.navweaps.com/Weapons/WAMB...2A_and_X%2A%2A
We have to wait until 1943 to see the entry into service of an underwater charge really dangerous for deep-diving uboats.
Fast, the Mark X version 2 reaches a depth of 640 feet.
On the other hand, it uses TNT as an explosive. Despite its heavy weight, the destructive range is only slightly increased compared to the Mark VII (also using TNT).
Quote:
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The killing radius of a depth charge depends on the depth of detonation, the proximity of detonation to the submarine, the payload of the depth charge and the size and strength of the submarine hull. A depth charge of approximately 100 kg of TNT (400 MJ) would normally have a killing radius (hull breach) of only 3–4 meters (10–13 ft) against a conventional 1000-ton submarine, while the disablement radius (where the submarine is not sunk but put out of commission) would be approximately 8–10 meters (26–33 ft). A larger payload increases the radius only relatively little because the effect of an underwater explosion decreases as the cube of the distance to the target.
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Source:
https://www.wikiwand.com/en/Depth_ch...EFCampbell1985