Cabin vibrations...

Maybe my hearing is selective. After 28 years working in the hospital where everything beeps, and the average ICU sound level is 70 - 80 decibels, I have learned to ignore some sounds and listen for the odd ones. Hearing protection when I worked in the furniture factory, or on the farm as a kid was different then, factory yes, farm no, helicopters yes, and never much got into loud concerts.

Most of the sounds on the boat I enjoy, it the little voices :twisted: that make me :shock: crazy :roll: :lol:

Harvey
SleepyC :moon

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What one can look forward to, if they don't protect their hearing, is that those annoying noises will have less and less volume as the years go by. Enjoy!
 
Aurelia":2pobjh50 said:
Here is how it works on our boat.

I hear any rattle like sound, I ask Cindie to find it and fix it OR drive while I find and fix it.

Our boat is pretty quiet as rattles go because I can't stand them. Cindie doesn't mind so much.

Greg
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Pritty much how it works for us also. The 22 was way more quiet then the 25, especially after I applied the Delta T insulation.
 
I agree it's the prop. Here's why - We have the noise from vibration. It's like what you get with a tuning fork, it is mainly from the v berth panels and is an issue at specific RPMs, unfortunately RPMs we like cruising at.

The vibration is real noticeable with one prop and almost non existent with the other prop. Both props are Michigan alloy props. I plan to have the one prop trued and balanced in hopes it resolves the issue.

I have considered these engine pads called Vibra Stop. Anyone used them?
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Kevin
 
Oh, and those of us with twins get a very interesting and annoying harmonic vibration if each engine is at exactly the same RPM. At least my 45s do. The rattles really don't bother me, but that really does. It goes away completely when opening the cabin door or changing the RPM of one engine by 50 rpms (or so). Boats are loud.....you should hear my friends 2 stroke Detroit commercial fishing boat - never mind, you probably can hear it down in Puget Sound and wonder what the heck is making all that racket......LOL.....
 
As a mechanic.... I need more information.... is it a vibration ? noise ? or a gush of air when you hit a good wave ?

Inside the cabin you should not feel anything different when you hit a wave other than the noise of the wave .... if you feel anything ...start looking for a bubble in the gel coat.... Fishtales would gush air out the berth area when she would hit a wave....caused her to be wrecked out...

a bang sort of noise can be from something loose...or moving...

a vibration could be a bulkhead loose or the harmonics of the hull...but that should not cause any concern as it would feel minor... Obviously if something is causing concern it is time for you to take someone very experienced for a ride so they can look for the cause when it is happening...

I have dinged lots of props but the only real vibration I have had is the loss of a blade....and that was just after hitting a rock...oops.. so it was obvious...

Joel
SEA3PO
 
I am not an expert but I've read a lot about noise and how to "control" it due to working on cars as a hobby. Noise is heat (or so the engineers say). In order to deaden it it has to be absorbed, hence the foil/butyl backed films you see being applied to auto interiors. Even then, that needs to be covered in a deadener like closed cell foam etc. In cars it's easily done under carpeting, door panels, head liner etc. In a C-Dory it would be a pia, be unsightly and complicate the simplicity. Imagine a "fancy" boat with all the vinyl trim covering the interior and carpeting.

There are sound absorbing coatings (also used in auto applications like Lizard Skin http://www.lizardskin.com/) and I imagine those would be cleaner and less problematic, but the process to spray it on all interior surfaces would not be for the faint of heart. It would involve taking apart the wiring etc, cleaning, masking, spraying and putting it all back together.

We found underway it's best to close the door; cuts engine noise so we can talk. Lots of things to rattle, vibrate and oscillate so...
 
The dash panel on that model isn't integral to the rest of the hull, and was a source of a lot of vibration on both of my 22's. Anything more than flat calm water made it happen. I also remember hearing a lot of wave slap on the hull. I used foam ear plugs to screen it out. Check your mounted electronics and gauges in that area for snug attachment. If it's truly a harmonic-type vibration regardless of speed and/or water condition then throw on your spare and have the main prop balanced. Best, Mike.
 
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