Originally Posted by Vanilla
I doubt that even a Veteran or Elite destroyer would hear a sub running silent (15 rpm of E-machine, that is the propeller rotates only once every four seconds) and below 200m through their passive hydrophones. Particularly if we consider noise of the destroyer itself, turbulence they've created speeding around, recent DC blasts bubbles waves and ripples on the surface etc. I guess even modern destroyer, would have difficulties keeping contact.
And since the sub would be impossible to hear they have to ping to keep the contact - where SteelViking reported they didn't, that is unrealistic.
My recent experience with HK group: 1939, on clear sunny day at about 1400 a TF was reported by the lookouts. I ordered ahead flank and steered a intercept course as I could only see smokes and thought at first that it could be a BB or CA. After 15 minutes I got much closer and identified the TF as 4 DDs in a box pattern. While I was hesitating whether to attack, the closest DD steered my way and increased speed - his range ~5km, AOB ~70stb, seen on ~10 o'clock position, my speed - flank, wind ~3-4m/s, sun, scattered clouds. Crash dive to 100m, 90 degree turn to port, then silent running. DD run over my position dropping 2 DCs (no pings at all), exploded about 50-100m away and much shallower as observed through Obs (i know it is cheating). Immediately after explosions I made ahead flank burst for 15 seconds and turned 45 stb. Destroyer slowed down and sitted for a minute or so listening (?) Then speeded up to DC charge turned roughly in my direction but failed to run over me, dropped 1 DC ~100m away to port. Sonar reports 2nd DD got close (I play with externals off), it started to search far away from me and failed to find me at all. In the mean time I sinked to 135m. The first DD made two more runs each further away from me. Then lost me completely, I ordered 2 knots ahead and steered away from him, after 15 minutes ordered 3 knots. Judging by the sound DD searches a bit more and then steam away to rejoin TF.
It all seemed very realistic to me except that they definitely did not try to ping me as much as I expected in approx. 1 hour this thing took place I heard only 2-3 random pings. While in reality you would expect them to ping continuosly until ceasing search, why should DD not ping if he knows for sure that you already hear him? Even if he pings everytime in completely random direction and depth, the statistics chances of catching you in the beam get higher with every single ping. So he would ping, I recon, continuosly as soon as he discovers you (remember 2.5km range of that 'searchlight' beam?) and not ceasing until he leaves "search" mode, only switching to ranging gate when making his DC run.
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07-21-10, 05:26 PM
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