This is interesting because 'older boats', say Skipjacks and Permits had issues. So in a battle of new vs old, it could be problem. Jive Turkey had the SJ out was reporting "explosions' as he cruise 700 ft before leveling out and the RBU's started dropping. It would probably be unique on a boat basis, and its duty/maintenance cycle. I suspect it's just averaged into a boat's self-noise. Some are quiet and some aren't.
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