[REL] Additional Depth Charges v1.0

tomfon · 02-12-16, 04:43 PM

Description

SH3 and GWX feature only one type of depth charge. This simple mod introduces another four types of DCs for the American & British destroyers, destroyer escorts and frigates. The appearance of each type of depth charge depends on the type of each warship and of course on the progress of your career. This mod doesn't introduce a new 3D model either for the depth charge racks or for each type of depth charge barell. The core of the mod originates from the NYGM supermod which already includes a mod that adds additional types of depth charges to the game (New Depth Charge Racks & New Depth Charges Mod). 'Stiebler' granted me permission to use the mod and as a result i modified the relative files and also edited the .eqp files.

The mod introduces the following versions of depth charges:

---American DCs---

*Mark 6: The standard depth charge used by the U.S. Navy for most of the war. Its terminal velocity was 2.4 m/s (meters per second) or 8 f/s (feet per second).

*Mark 7 (Mod 1): This version was used early in the war and it had a terminal velocity of 2.7 m/s or 9 f/s.

*Mark 9: The standard version used by USN ships in the latter part of the war (1943 onwards). Despite the fact that it was lighter compared to Mark 6 & 7 types, it was more powerful because its explosive charge was Torpex instead of TNT. The terminal velocity of this depth charge was 6.9 m/s or 22.7 f/s.

---British DCs---

*Mark VII: The standard DC used by the Royal Navy for the first three years of the war. It was relatively faster compared to the American Mark 6 & 7, with a terminal velocity of 3.0 m/s or 9.9 f/s.

*Mark VII Heavy: This depth charge had an improved sinking rate of 5.1 m/s or 16.8 f/s due to a cast-iron weight attached to it.

Things that work (Technical info)

Sink Rate/Terminal velocity. It works but there is a limitation. Read below.
Depth precision. I left it unchanged (15 m). Depth charges will detonate randomly at this variance. Example: If the firing depth is set by the AI to 100 m, the depth charge will explode randomly between 85 and 115 m.
Min and Max blast radius. Max radius: For the Mark 9 it is 25 m, for the Mark 7, 30 m and for all others it is 20 m. A single-hulled American WWI/WWII submarine would take minor to moderate damage if a DC charged with 300 pounds (~136 kg) of TNT exploded at a distance of 50 to 100 feet (ref. 1, §15-12). It is known that U-boats could do much better since they were double-hulled. So, with depth precision set at 15 m, if a Mark 6 DC detonates 15 m away from the U-boat's hull, the U-boat will suffer minor to moderate damage. Likewise, the U-boat will suffer almost no damage if the detonation occurs 20 m away. Min radius: I specified a value of 4.5 meters (ref. 5). This means that if your U-boat happens to be within a 4.5 m radius from the epicenter of the explosion then the full amount of points of damage will be applied.
Shockwave effect. I made it weaker but has no effect on blast radius. It doesn't affect the performance of depth charges, in general.

Limitations

1. As soon as a depth charge enters water it immediately acquires its terminal velocity. This is not the real case.

2. Every depth charge had a maximum depth setting. In SH3 the maximum depth setting for all DCs is 300 m.

Compatibility & Installation

This mod is JSGME ready. It is compatible only with GWX 'Gold' v3.0. It is also compatible with:

*Longer Repair Times v2.04 (LRT v2.04).
*Every option of "OLC 'Gold' MkII".

Installation instructions are provided in the README file.

Thanks & Acknowledgements

1. 'Stiebler' for allowing me to use specific files (read above).
2. 'skwas' for his S3D utility.
3. 'padi' for his 'Real ASW Mod' from which i derived useful information regarding availability dates.

Interesting readings (References)

1.War Damage Report No.58 (US Hydrographic Office)
2.Depth Charges (The Pacific War Online Encyclopedia)
3.Mark 6 & Mark 7 Depth Charges
4.American & British ASW Weapons
5.Depth Charge (Wiki)

Further development

Though this mod includes most of the basic types of depth charges there are other types which i would like to add to the game. In addition, it would be nice if i could find the time to expand the mod in such a way that it depicts the correct amount of depth charges each type of destroyer & frigate carried. We'll see.

DOWNLOAD (SUBSIM)
DOWNLOAD (MEDIAFIRE)

A6Intruder · 02-13-16, 03:43 AM

Hi,
could you please explain the differeces between your Mod and Real ASW Mod from Padi.
Thanks in forward.
Best regards

tomfon · 02-13-16, 04:41 AM

Hello A6Intruder.

Well, my mod is compatible with GWX3. If you'd like to use padi's mod instead you should then edit all .eqp files so as to link the 3D model of each ship with the corresponding depth charge taking into account the type of the ship and the date.

There are some other differences regarding the properties of DCs (min & max efficiency radius,depth precision, hit points, shockwave effect).

What really troubled me was the efficiency radius and depth precision.

I will try and post my findings later.

sublynx · 02-13-16, 07:11 AM

Very cool!

Anvar1061 · 02-13-16, 11:02 AM

Quote:

Originally Posted by sublynx

Very cool!

Additional Depth Charges v1.0 (GWX3)

Real ASW Mod v.3 Beta 4

tomfon · 02-13-16, 11:29 AM

@Anvar1061

In case you haven't read the description of the mod: It doesn't include new 3D models for the barrels.

So, please don't hijack the thread. If you don't like it, don't use it.

pathealey2 · 02-13-16, 07:04 PM

Excellent work. Thank you - trying it now.

tomfon · 02-13-16, 07:16 PM

Quote:

Originally Posted by pathealey2

Excellent work. Thank you - trying it now.

Hello, pathealey2 and welcome onboard!

geosub1978 · 02-14-16, 01:04 PM

If this is for any help:

I had once met a wolfpack outside Portugal. I fired a stern tube at one of the submarines just to see what would happen...the torpedo hit the submerged submarine at the rear...however, the only apparent effect was a paint scratch...

rudewarrior · 02-15-16, 08:15 PM

Two questions:

Is what you define as "shockwave effect" the same as explosion_impulse?
What exactly is explosion_impulse? Perhaps the time length of the explosion in ms?

Thanx for the info.

tomfon · 02-16-16, 05:17 AM

@rudewarior

1. Exactly.
2. It defines the change of momentum due to a nearby explosion. If you specify a large number the boat will be "dragged" through the water...

This parameter has no effect on the performance of depth charges and it is not related to the damage inflicted on the U-boat. So, yeah, it's the shockwave effect.

Izgud · 03-03-17, 04:16 PM

Great mod! Exactly what GWX needs.

02-12-16, 04:43 PM	#1
tomfon Grey Wolf Join Date: Jan 2008 Location: CK7662 Posts: 918 Downloads: 178 Uploads: 4	Additional Depth Charges v1.0 Description SH3 and GWX feature only one type of depth charge. This simple mod introduces another four types of DCs for the American & British destroyers, destroyer escorts and frigates. The appearance of each type of depth charge depends on the type of each warship and of course on the progress of your career. This mod doesn't introduce a new 3D model either for the depth charge racks or for each type of depth charge barell. The core of the mod originates from the NYGM supermod which already includes a mod that adds additional types of depth charges to the game (New Depth Charge Racks & New Depth Charges Mod). 'Stiebler' granted me permission to use the mod and as a result i modified the relative files and also edited the .eqp files. The mod introduces the following versions of depth charges: *---American DCs---* Mark 6: The standard depth charge used by the U.S. Navy for most of the war. Its terminal velocity was 2.4 m/s (meters per second) or 8 f/s (feet per second). Mark 7 (Mod 1): This version was used early in the war and it had a terminal velocity of 2.7 m/s or 9 f/s. Mark 9: The standard version used by USN ships in the latter part of the war (1943 onwards). Despite the fact that it was lighter compared to Mark 6 & 7 types, it was more powerful because its explosive charge was Torpex instead of TNT. The terminal velocity of this depth charge was 6.9 m/s or 22.7 f/s. ---British DCs---* Mark VII: The standard DC used by the Royal Navy for the first three years of the war. It was relatively faster compared to the American Mark 6 & 7, with a terminal velocity of 3.0 m/s or 9.9 f/s. Mark VII Heavy: This depth charge had an improved sinking rate of 5.1 m/s or 16.8 f/s due to a cast-iron weight attached to it. Things that work (Technical info) Sink Rate/Terminal velocity. It works but there is a limitation. Read below. Depth precision. I left it unchanged (15 m). Depth charges will detonate randomly at this variance. Example: If the firing depth is set by the AI to 100 m, the depth charge will explode randomly between 85 and 115 m. Min and Max blast radius. Max radius: For the Mark 9 it is 25 m, for the Mark 7, 30 m and for all others it is 20 m. A single-hulled American WWI/WWII submarine would take minor to moderate damage if a DC charged with 300 pounds (~136 kg) of TNT exploded at a distance of 50 to 100 feet (ref. 1, §15-12). It is known that U-boats could do much better since they were double-hulled. So, with depth precision set at 15 m, if a Mark 6 DC detonates 15 m away from the U-boat's hull, the U-boat will suffer minor to moderate damage. Likewise, the U-boat will suffer almost no damage if the detonation occurs 20 m away. Min radius: I specified a value of 4.5 meters (ref. 5). This means that if your U-boat happens to be within a 4.5 m radius from the epicenter of the explosion then the full amount of points of damage will be applied. Shockwave effect. I made it weaker but has no effect on blast radius. It doesn't affect the performance of depth charges, in general. Limitations 1. As soon as a depth charge enters water it immediately acquires its terminal velocity. This is not the real case. 2. Every depth charge had a maximum depth setting. In SH3 the maximum depth setting for all DCs is 300 m. Compatibility & Installation This mod is JSGME ready. It is compatible only with GWX 'Gold' v3.0. It is also compatible with: Longer Repair Times v2.04 (LRT v2.04). Every option of "OLC 'Gold' MkII". Installation instructions are provided in the README file. Thanks & Acknowledgements 1. 'Stiebler' for allowing me to use specific files (read above). 2. 'skwas' for his S3D utility. 3. 'padi' for his 'Real ASW Mod' from which i derived useful information regarding availability dates. Interesting readings (References) 1.War Damage Report No.58 (US Hydrographic Office) 2.Depth Charges (The Pacific War Online Encyclopedia) 3.Mark 6 & Mark 7 Depth Charges 4.American & British ASW Weapons 5.Depth Charge (Wiki) Further development Though this mod includes most of the basic types of depth charges there are other types which i would like to add to the game. In addition, it would be nice if i could find the time to expand the mod in such a way that it depicts the correct amount of depth charges each type of destroyer & frigate carried. We'll see. DOWNLOAD (SUBSIM) DOWNLOAD (MEDIAFIRE) __________________ "I would rather have questions that can't be answered than answers which can't be questioned." - Richard P. Feynman [1918/1988] "I've missed more than 9000 shots in my career. I've lost almost 300 games. 26 times, I've been trusted to take the game winning shot and missed. I've failed over and over and over again in my life. And that is why I succeed." - Michael Jordan Mods for SH3 Last edited by tomfon; 04-24-16 at 04:28 PM. Reason: Technical information edited.

02-13-16, 03:43 AM	#2
A6Intruder Seasoned Skipper Join Date: Aug 2006 Location: Germany Posts: 663 Downloads: 22 Uploads: 0	Hi, could you please explain the differeces between your Mod and Real ASW Mod from Padi. Thanks in forward. Best regards __________________ http://www.mediafire.com/UffzRohledder

02-13-16, 04:41 AM	#3
tomfon Grey Wolf Join Date: Jan 2008 Location: CK7662 Posts: 918 Downloads: 178 Uploads: 4	Hello A6Intruder. Well, my mod is compatible with GWX3. If you'd like to use padi's mod instead you should then edit all .eqp files so as to link the 3D model of each ship with the corresponding depth charge taking into account the type of the ship and the date. There are some other differences regarding the properties of DCs (min & max efficiency radius,depth precision, hit points, shockwave effect). What really troubled me was the efficiency radius and depth precision. I will try and post my findings later. __________________ "I would rather have questions that can't be answered than answers which can't be questioned." - Richard P. Feynman [1918/1988] "I've missed more than 9000 shots in my career. I've lost almost 300 games. 26 times, I've been trusted to take the game winning shot and missed. I've failed over and over and over again in my life. And that is why I succeed." - Michael Jordan Mods for SH3

02-13-16, 07:11 AM	#4
sublynx Sea Lord Join Date: Mar 2011 Location: In the conning tower of my VIIC scanning the sea through the periscope Posts: 1,698 Downloads: 173 Uploads: 7	Very cool! __________________ [SIGPIC][/SIGPIC] NYGM+H.sie v16+Stiebler 4C+MaGui WS

02-13-16, 11:29 AM	#6
tomfon Grey Wolf Join Date: Jan 2008 Location: CK7662 Posts: 918 Downloads: 178 Uploads: 4	@Anvar1061 In case you haven't read the description of the mod: It doesn't include new 3D models for the barrels. So, please don't hijack the thread. If you don't like it, don't use it. __________________ "I would rather have questions that can't be answered than answers which can't be questioned." - Richard P. Feynman [1918/1988] "I've missed more than 9000 shots in my career. I've lost almost 300 games. 26 times, I've been trusted to take the game winning shot and missed. I've failed over and over and over again in my life. And that is why I succeed." - Michael Jordan Mods for SH3

02-13-16, 07:04 PM	#7
pathealey2 Nub Join Date: Sep 2009 Posts: 4 Downloads: 282 Uploads: 0	Excellent work. Thank you - trying it now.

02-14-16, 01:04 PM	#9
geosub1978 Samurai Navy Join Date: Oct 2006 Location: Salamis Base Posts: 567 Downloads: 229 Uploads: 0	If this is for any help: I had once met a wolfpack outside Portugal. I fired a stern tube at one of the submarines just to see what would happen...the torpedo hit the submerged submarine at the rear...however, the only apparent effect was a paint scratch... __________________

02-15-16, 08:15 PM	#10
rudewarrior Sonar Guy Join Date: Apr 2005 Location: Middlebury, VT, USA Posts: 378 Downloads: 165 Uploads: 2	Two questions: Is what you define as "shockwave effect" the same as explosion_impulse? What exactly is explosion_impulse? Perhaps the time length of the explosion in ms? Thanx for the info.

02-16-16, 05:17 AM	#11
tomfon Grey Wolf Join Date: Jan 2008 Location: CK7662 Posts: 918 Downloads: 178 Uploads: 4	@rudewarior 1. Exactly. 2. It defines the change of momentum due to a nearby explosion. If you specify a large number the boat will be "dragged" through the water... This parameter has no effect on the performance of depth charges and it is not related to the damage inflicted on the U-boat. So, yeah, it's the shockwave effect. __________________ "I would rather have questions that can't be answered than answers which can't be questioned." - Richard P. Feynman [1918/1988] "I've missed more than 9000 shots in my career. I've lost almost 300 games. 26 times, I've been trusted to take the game winning shot and missed. I've failed over and over and over again in my life. And that is why I succeed." - Michael Jordan Mods for SH3 Last edited by tomfon; 03-24-16 at 11:07 AM.

03-03-17, 04:16 PM	#12
Izgud Watch Join Date: Aug 2016 Posts: 21 Downloads: 150 Uploads: 0	Great mod! Exactly what GWX needs.