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Stealhead · 02-06-12, 11:39 AM

I am fairly certain it is even mentioned in "Thunder Below" and some others that it was not possible to use passive sonar(hydrophones) on the surface for the obvious reason that the head is on top of the hull and therefore not in the water.Now a ping using the active sonar was possible of course these are on the keel more or less so they are always in the water they could be retracted in real life as well.

The rotating device near the bow is the JT head and the man operating this actually sat in fore torpedo room later in the conning tower.The previous design was JP which I believe was located somewhere inside the upper hull I am not sure because my reference "US Submarines Though 1945" does not go into much detail about the older WCA/WDA sets nor the JT but goes into much better detail on the later war gear.But it seems that the passive part of sonar systems always where located on top of the hull and the active on the bottom(later war some times two on bottom one on top for active) excluding the S-boats where it was all on the deck.Later in the war they also had WFA which could also detect mines with great accuracy and was also much more accurate against ships but this is not included in the game.

In other words if you want to play more realistically then you cant use the passive sonar on the surface and in an S-boat you cant use any sonar at all fully surfaced.In a fleetboat you can use active sonar on the surface though it was done commonly I am pretty sure I recall its use being mentioned in "Thunder Below" and "Wahoo" of course it wold be used with great care and very briefly something the game does not really simulate is how the density of water effected the active and passive sonar of the submarine sometimes very strongly in a negative manner.(reducing range and accuracy) What helps you hide from the IJN also hinders your sonar or it should.

look at this a little about the JT.You like math?Click on the Sonar home page at the bottom ans start from the first page of the manual you'll see tons of it.
http://www.hnsa.org/doc/sonar/chap13.htm

02-06-12, 11:39 AM	#27
Stealhead Navy Seal Join Date: Feb 2009 Location: Kentucky Posts: 5,421 Downloads: 85 Uploads: 0	I am fairly certain it is even mentioned in "Thunder Below" and some others that it was not possible to use passive sonar(hydrophones) on the surface for the obvious reason that the head is on top of the hull and therefore not in the water.Now a ping using the active sonar was possible of course these are on the keel more or less so they are always in the water they could be retracted in real life as well. The rotating device near the bow is the JT head and the man operating this actually sat in fore torpedo room later in the conning tower.The previous design was JP which I believe was located somewhere inside the upper hull I am not sure because my reference "US Submarines Though 1945" does not go into much detail about the older WCA/WDA sets nor the JT but goes into much better detail on the later war gear.But it seems that the passive part of sonar systems always where located on top of the hull and the active on the bottom(later war some times two on bottom one on top for active) excluding the S-boats where it was all on the deck.Later in the war they also had WFA which could also detect mines with great accuracy and was also much more accurate against ships but this is not included in the game. In other words if you want to play more realistically then you cant use the passive sonar on the surface and in an S-boat you cant use any sonar at all fully surfaced.In a fleetboat you can use active sonar on the surface though it was done commonly I am pretty sure I recall its use being mentioned in "Thunder Below" and "Wahoo" of course it wold be used with great care and very briefly something the game does not really simulate is how the density of water effected the active and passive sonar of the submarine sometimes very strongly in a negative manner.(reducing range and accuracy) What helps you hide from the IJN also hinders your sonar or it should. look at this a little about the JT.You like math?Click on the Sonar home page at the bottom ans start from the first page of the manual you'll see tons of it. http://www.hnsa.org/doc/sonar/chap13.htm Last edited by Stealhead; 02-06-12 at 12:15 PM.