Quote:
Originally Posted by JhonSilver
According to this American chart 1987, the noise level of Skipjack was in the range of 150-172 dB.
Permit is from 137 dB.
- 133 db. (Later reduced to 129 dB)
Old diesel subs (613, 641) from 127 dB (138 full speed). Kilo - 115 dB.
Sierra - 115 dB.
Alfa full speed - 165 dB (so on 5 knot must 129 db, surprize)
In general, it is clear that the developers adhered to this data, but apparently the skipjack came out completely unplayable
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sorry bad english |
And to be honest the estimates of self noise tend to have relatively high spread between different sources.
I don't know at what speeds the 1987 chart indicates the self noise. Other published work, especially on SSBN tend to predict much lower noise. For example Yankee in 1987 chart is predicted 150 db at speed unknown. Paper below predicts 135-140 at 4kts.
On older boats difference in prediction seems larger. Hotel for example in 1987 chart is predicted 160-170 db, paper below predicts 140-145 at 4 kts.
https://fas.org/spp/eprint/snf03221.htm