Fireing a torpedo from depth

skirich · 08-30-19, 11:34 PM

How deep can you fire a torpedo from?
How is the accuracy? I assume the trajectory is somewhat affected?

In real life could you do this?

ETR3(SS) · 08-31-19, 01:37 AM

max torpedo launch depth can be found in the respective boats .cfg file. I believe stock values are 30 meters (98 feet). As soon as you launch the torpedo it will proceed to its preset depth, so given the max depth to launch this souldn't affect your solution at all.

As for the reality of this. Yes it is possible. Torpedoes back then were launched using compressed air. So once the tube is ready to fire, the compressed air is released into the back of the tube to drive the torpedo out. Now this only works up to a certain depth as the deeper you go the more pressure you need to drive the torpedo out. Not much of a problem as attacks were conducted visually using the periscope anyways. With the advent of better sonar equipment the tech to launch torpedoes also evolved.

propbeanie · 08-31-19, 09:13 AM

In real life during the pre-war and early-war months, it was SOP to fire from up to 100 foot depth without use of the periscope, using sonar bearings only. That was the way the USN trained their submariners to attack. They feared the periscope being seen, as witnessed by the war games the USN conducted pre-war, where sub skippers received bad scores if they were seen.

There were multiple reports of success from US skippers early in the war, based upon the explosions they heard after firing via sonar targeting. However, in reality, they were usually hearing premature detonations of the torpedoes from the Mark6 exploder failures. If there were any "hits" accomplished by use of Sonar, they were few and far between. The only "witness" to success would have been the enemy. The USN quit using that targeting method early.

There are several methods you can use in the game to "target" via sonar, and the use of active sonar (pinging) is the easiest. There are several tutorials on the four-bearing sonar technique, but the original for Kuikueg's links are dead, even in THEBERBSTER's thread... Do an internet search on something like "site:subsim.com/radioroom 4 bearing technique" or "four bearing technique" and you should find several useful hits, but there is math involved in the technique...

- if you do it properly, your "hit" percentage will improve, but it is definitely much more difficult to get your boat in position if you do not use the periscope at least a little...

08-30-19, 11:34 PM	#1
skirich Chief Join Date: Aug 2019 Location: Patroling the south pacific Posts: 321 Downloads: 75 Uploads: 0	Fireing a torpedo from depth How deep can you fire a torpedo from? How is the accuracy? I assume the trajectory is somewhat affected? In real life could you do this?

08-31-19, 01:37 AM	#2
ETR3(SS) Ocean Warrior Join Date: Dec 2007 Location: Between test depth and periscope depth Posts: 3,021 Downloads: 175 Uploads: 16	max torpedo launch depth can be found in the respective boats .cfg file. I believe stock values are 30 meters (98 feet). As soon as you launch the torpedo it will proceed to its preset depth, so given the max depth to launch this souldn't affect your solution at all. As for the reality of this. Yes it is possible. Torpedoes back then were launched using compressed air. So once the tube is ready to fire, the compressed air is released into the back of the tube to drive the torpedo out. Now this only works up to a certain depth as the deeper you go the more pressure you need to drive the torpedo out. Not much of a problem as attacks were conducted visually using the periscope anyways. With the advent of better sonar equipment the tech to launch torpedoes also evolved. __________________ USS Kentucky SSBN 737 (G) Comms Div 2003-2006 Qualified 19 November 03 Yes I was really on a submarine.

08-31-19, 09:13 AM	#3
propbeanie CTD - it's not just a job Join Date: May 2016 Location: One hour from Music City USA! Posts: 10,098 Downloads: 451 Uploads: 2	In real life during the pre-war and early-war months, it was SOP to fire from up to 100 foot depth without use of the periscope, using sonar bearings only. That was the way the USN trained their submariners to attack. They feared the periscope being seen, as witnessed by the war games the USN conducted pre-war, where sub skippers received bad scores if they were seen. There were multiple reports of success from US skippers early in the war, based upon the explosions they heard after firing via sonar targeting. However, in reality, they were usually hearing premature detonations of the torpedoes from the Mark6 exploder failures. If there were any "hits" accomplished by use of Sonar, they were few and far between. The only "witness" to success would have been the enemy. The USN quit using that targeting method early. There are several methods you can use in the game to "target" via sonar, and the use of active sonar (pinging) is the easiest. There are several tutorials on the four-bearing sonar technique, but the original for Kuikueg's links are dead, even in THEBERBSTER's thread... Do an internet search on something like "site:subsim.com/radioroom 4 bearing technique" or "four bearing technique" and you should find several useful hits, but there is math involved in the technique... - if you do it properly, your "hit" percentage will improve, but it is definitely much more difficult to get your boat in position if you do not use the periscope at least a little... __________________ "...and bollocks to the naysayers" - Jimbuna