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Originally Posted by Neutrino 123
Well, a Kilo Improved would have the same amount of noise at 7 knots and an Akula-i at four. Realistically, a stationary Kilo probably shouldn't be detected at that range, but due to limitations in the program, it generates the same amount of noise as a bit less then slow running.
I think used a bad example at first. The question is, should an Akula-i at four knots or a Kilo-i at seven be detectable at ultra-close range with TB-23? I would think so. I would also hazard a guess that with the current values, a stationary Seawolf and maybe a Kilo-i cannot be detected at any range with any passive sensor, making HF active more useful against it...
Exactly where is the noise to DW noise level conversion? Maybe it was posted before, but I must have missed it (sorry if this is so).
Edit: I did another test, and couldn't detect a Kilo-i moving seven knots at ~370 yards with the TB-23. Acousitc conditions were the same as above (subs at 150 feet, bottom limited, total depth a bit less then 300 feet).
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At 7 knots, I would think it should be detectable from a rather short distance, but in your first post you said 1 knot.
I'd try it in open water. Bottom limited environments, especially in shallow water, should make sonar performance very crappy. Although I think 370 yards with no detection is a little too crappy. It's weird though, I've detected Kilo-I's with the mod at similar speeds with a VLAD at 2nm.....time for some testing.
EDIT: Just tested it. Drove a 688I vs a 7-knot Kilo-I. Bottom limited, 300ft, rock bottom, sea state 3, both boats at 150ft.
I started them out 5 nm apart, I detected the Kilo imediately upon turning the TA to bear on target. 2 LINES! I ran off, the 2nd line dissapeared at 7.0nm, and the first line faded out at 11.4nm.
This Kilo plodding along at 7 knots is in crappy water is more detectable than a Seawolf at 35 knots in good conditions! I'd say tweaking is in order, but not in your direction!