[needed] US depth charges mod for the IJN campaign

[keltos01]

In its original form, it was not yet sufficently fast; modifications, such as lead ballast and different fins were applied, finally reaching the goal. It did, however, have to sacrifce explosive power and carried only 200lbs Torpex. Magnetic depth charges were also tried, but reliability problems precluded widespread use although the results obtained were outstanding.

Accordingly, a split version of the Y-gun, the K-gun, was developed - it could be mounted on the sides of the superstructure, firing one depth charge outboard.

Several of these could be and were mounted on each destroyer. They were the fleet destroyers' main and most effective ASW weapon, as those didn't receive Hegehog.


Mk 6 (Early War)

Weight: 338 kg / 745lbs

Charge: 272 kg / 600lbs Torpex

Sinking Speed: 2.4m/s / 8f/s later mods (mid-1942) 3.7m/s / 12f/s

Depth: 9 - 91m / 30 - 300ft later mods (mid-1942) up to 183m / 600ft



Mk 9 (Late War)




Mark IX Depth Charge used by U.S. Navy later in World War II. Unlike the cylindrical, barrel-shaped depth charge used earlier, the Mark IX is streamlined and equipped with canted fins to impart rotation on the depth charge, allowing it to fall in a straight trajectory with less chance of drifting off target.

Weight: ????

Charge: 91 kg / 200lbs Torpex

Sinking Speed: 4.4m/s / 14.5f/s later mods(1944) 6.9m/s / 22.7f/s


Depth: 9 - 183m / 30 - 600ft


http://www.microworks.net/pacific/ar...th_charges.htm

use :

The K-guns were often used together with stern racks to create patterns of six to ten charges. In all cases, the attacking ship needed to be moving above a certain speed or it would be damaged by the force of its own weapons.

For the reasons expressed above, the depth charge was generally replaced as an anti-submarine weapon. Initially, this was by ahead-throwing weapons such as the British-developed Hedgehog and later Squid. These weapons threw a pattern of warheads ahead of the attacking vessel to bracket a submerged contact. Hedgehog was contact fuzed, but Squid fired small depth-charges with hydrostatic arming. Later developments included the Mark 24 "Fido" acoustic homing torpedo

The killing radius of a depth charge depends on the payload of the depth charge and the size and strength of the submarine hull. A depth charge of approximately 100 kg of TNT would normally have a killing radius (hull breach) of only 3-4 meters 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. A higher payload only increases the radius by a few meters due to the fact that the effect of an underwater explosion decreases with the distance cubed.

http://en.wikipedia.org/wiki/Depth_charge



here is the manual of the mark 6 depth charge from 1943 :





http://www.hnsa.org/doc/depthcharge6/index.htm

in game there is but one DC :

sim


DC /MK14


aren't those DCs overstrong ? look at the mk14 torpedo zon file to the right compared to the dc's to the left... Max radius of 40 meters (120 feet) you gotta be kidding me !


I was wondering, since I play "the other side" how accurate were the damage/hitpoints settings of the US depth charges and their behavior (sink rate, duds...) in SH4 ?


I would like to be absolutely sure that the ones we implement for the IJN campaign "Climb Mount Niitaka" are historically accurate. I was DC by a DD dropping 12 DC each and everytime... still looking as to how many they had...

this in turn reflects on my IBDM...

a movie :

http://www.wpafilmlibrary.com/detail...0b99fb749.html

keltos