My boat is pretty loud under power. It's not horrible, and you can have a conversation in the cockpit
, but it's loud enough below to require raised voices. It's definitely loud enough that it's a joy to turn it off to sail.
I have the A4, which is actually quieter and smoother than the small diesels used by Catalina
in the early 80's. They got much better as time went on. The engine noise
in the cockpit
is around the noise level of the blower that's mounted in the coaming. A4 == run the blower all the time, so that adds to the noise level.
I have zero soundproofing other than the liner and the cushion on the settee. Methinks soundproofing would help a bit, although the front of the engine (the flywheel for the A4) is too close to soundproof that front part.
I think one of the problems with noise in a C-30 is the engine is pretty much in the middle of the boat (under the galley
counter and the dinette settee) - Not in the back where there's less area to radiate sound.
If you look at other boats of the era, they're all noisier than modern boats. But I'd say the 30 is a bit noisier because of where the engine is located.