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Originally Posted by Mikhayl
"hydrophones" can, yes. U-boat hydrophones can't. A DD has its hydrophones on the keel, that's why it can't hear crap on the surface level. German hydrophones can technically hear things while the boat is surface, but unless the engines are stopped and the sea is mirror like, all you would hear is yourself and the waves, so the fact that you can hear as clearly on the surface + diesel engines as you do submerged + electric engine is a bug. And if you happen to have a KDB, it's located on the deck, so yes hearing propeller noise with it while on the surface is definitely a bug.
Man do I hate it when people brag about "physic class" and the like when it's just about research and reading. Besides dozens of people of NYGM, GWX, WAC and others have been researching exacty that for about 4 years, I guess they all missed physic class as well  |
No german boats I've played in Sh4 can hear on the water unless they get the final upgrade which is mounted down on the keel exactly the same as the US boats have from the start. I didnt argue about U-boat hydrophones because they work as intended. Indeed in every patrol I have done prior to gaining the final hydrophone for the Germans I had learned to dive to periscope depth to get the hydrophone head down in to the water.
Engine noise from onboard equipment and machinery from your own boat is always an issue with passive systems. Placement of the head on boats was always as far forwards as possible to try and counter it. The game models this as a 90 degree ark to the rear that blocks sound reception by your machinery. A destroyer on the surface that has "gone dark" can detect a noisey surface contact. Relative to a standard surface ship, a sub on the surface makes little noise, making ranged detection of it on the surface with passive sonar extremely difficlut. In reverse the sub can detect other noisey vessels (such as merchants) easier by relative sound levels. A sub would detect any surface contact via passive asdic/sonar long before a normal surface vessel would.
In particular surface detection by shipping is normally done by Radar and visual means as the sound detection is HIGHLY dependant on the operator of the device, the devices range, and features of the aperatus. The fact that in the game you have a sonar man who is well trained and the Allies have superior sonar technology plays a major factor in those surface detections.
Britain and the US were miles ahead in asdic/sonar technology and radar technology than Germany in WW2. The devices were of a much higher technical level and implementation than the German counterparts. In sofar as the game is modeled if its in the water it can detect surface noise.
There are a plethora of technical details in asdic/sonar transmission & reception that are not modeled in the game. If you would like to know more try here.
Histrorical Naval Ships Association