Nerdzy

Rptd: Ariel torpedoes deal excessive amounts of damage to ships.

Hello, it appears that torpedoes dropped from aircraft cause significantly more damage than torpedoes launched from naval vessels. For example, the PT boat variant of the U.S. Mk13 torpedo does manageable damage to the light cruisers in game; however, the aerial variant of the torpedo seemingly has a 100% chance of hull breaking any ship in game. This seemingly is true for all other aerial torpedoes in game. When hit by an aerial torpedo, almost every compartment and module in a cruiser will be destroyed and a hull breach with a diameter nearly half the length of the ship will be created. It doesn't matter where an air-dropped torpedo hits a ship, they will always destroy it with one hit. In the video below, we tested both the PT boat and aerial variants of the Mk13 Torpedo on 

several different light cruisers. It should be noted that in the video, when my HMNZS Leander is ammo-racked by a PT boat torpedo, only the affected compartments are displayed as damaged while the aerial torpedo destroys nearly every compartment and module in a similar situation. This shows that the aerial torpedoes are not simply ammo-racking ships, but are in fact destroying practically every compartment at once. 

 

Clog:2019_06_27_19_37_39__9052.clog

Replays: #2019.06.27 21.25.06.wrpl#2019.06.27 21.42.59.wrpl

DxDiag:DxDiag.txt

Edited by Nerdzy
Added additional details and spelling fixes.
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I am discussing this with the Gaijin Historian.  Although both torpedoes have the designation Mk 13, there are substantial differences between them. 

 

Both in the design of the torpedo and the explosive used in the warhead as well as the amount of explosive.

 

I will get back to you.

 

 

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The Mk 13 on PT boats and aircraft is the same torpedo - the aircraft torpedo was used on PT boats due to a shortage of their nominal armament, and proved to be advantageous for several reasons - it was lighter, shorter (took up less space), it didn't need tubes and the associated lubrication and fire risk, and it had a heavier warhead than the original ones fitted - 600lb vs about 440, and Torpex vs TNT - so both heavier AND more powerful explosive.

 

See https://www.history.navy.mil/museums/keyport/html/part2.htm

https://maritime.org/doc/torpedomk13/torp003.htm

https://pwencycl.kgbudge.com/U/s/US_Mark_13_torpedo.htm

http://www.navweaps.com/Weapons/WTUS_WWII.htm

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In game the Mk13 on all PT boats is the Mod 0 variant with the smallest warhead available to the Mk13 family of torpedoes only 178 KG of TNT. However the later Mod 10 variant had access to a 275 KG Torpex warhead which equated to around 440 KG of TNT, and a 272 KG HBX warhead which comes to 435 KG TNT equivalent.

 

Given that the air drop variant shares the exact same design as the Mod 10 variant (the most telling feature is the ring around the propellers which was only added in the Mod 10 variant and after and is not present on the torpedoes used by the PT boats in game), it may be possible to chalk up the increased damage capabilities of the air launched variant to it simply having a much more powerful warhead.

 

A little side by side comparison of the visual differences between both torpedoes :

Spoiler

image.thumb.png.7a2c5cb0043a00e590b6b743

This is a MK13 Mod 10, notice the ring around the fins in the rear

image.png.5f69de44e58961d8aef7b1237092a5

This is a Mk13 Mod 0, notice the lack of a ring around the fins

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Alright thank you. I would like to specify; however, that this isn't exclusive to Mk.13s. We simply used the Mk.13s to test the issue because the aerial and Pt boat variants seemed to be more similar to each other than other torps in the game. Air-dropped torps from other nations, and of all sizes, also seem remarkably more powerful than torps launched by naval vessels.

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It seems like the pt-boats are using the original Mark 13 (~400 lbs explosive; ~30 knots speed; 1949 lbs weight, 5700 yds distance), while aircraft is using later variants. [Compare OP 629A - USN Torpedos Mk 13 and Mk 13 mod 1 and 2; pages 3-5)

 

In 1944 / 1945 this variant does neither occur for pt-boats (compare Mine Disposal Handbook, 1945 - Part II - Chapter 3 - U. S. Torpedos; pages 2 and 2e-2f) as in OP 878 [Second Revision] - General Data on Navy, AN-Standard, Army and British Bombs from September 1944. (p. 63)

 

Spoiler

878.jpg.82a7d1f0931316bfda4c3ce79fd1ca14p63.jpg.bd42e5e2c8f10141bfbec135833e39d4

 

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Thanks all,

 

The differences on the torpedoes mentioned.  Mod 1 and Mod 10 etc, the rings and the differing explosive used etc were all the issues I have been in discussion with the Gaijin Historian about.

 

Cheers

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Hi
  Thank you for your interest and help improving the game.  

Your information has been forwarded to the Developers for their consideration.  

If there is anything further regarding this report a Technical Moderator will contact you.

Thank you again for your support.

 

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