cabin engine noise in 16 & 19 c-dory's

O

oldgrowth

New member
There have been many threads on the noise generated in the cabin on the C-Dory’s without a cabin bulkhead. I have been trying different things to lessen the engine noise inside the cabin. The foam rubber you see on the engine has made a big difference.

engine_wrap.sized.jpg

I now have to figure out a way of building something that will not interfere with either engine when they are turned or raised. It has to be mounted to the engine and easy to remove. I would like something that can be layered and shaped around the engine but not against it, like lead flashing but much lighter.

Building something really is not the problem, it is, I would like something besides thick foam for the insulation and would prefer something that could be layered in the enclosure.

Anybody know of a good sound insulation material that is light and thin?
________
Dave dlt.gif
 
Dave there was a post recently about using a plastic called Kydex which is thermo-moldable. Maybe you con fabricate a close fitting cover using Kydex and the insulation mentioned by Warren?
 
Joe - if he keeps adding feet, eventually the engine will get far enough away that he can't hear it from the helm. Problem solved if ya' ask me.
 
rogerbum":2focsgy6 said:
Joe - if he keeps adding feet, eventually the engine will get far enough away that he can't hear it from the helm. Problem solved if ya' ask me.
Click to expand...

Roger-

Yeah, pretty soon he's gonna have a Panga-Dory, and then one of those super-long river canoes you see on the travel films from Africa! Then he can arrange passengers from front to rear in First Class, Business, Economy, and Engine Compartment/Deaf Only.

Joe. :roll:
 
The stuff you want is called Aerogel.

aerogela.jpg
 
Ken - I remember Kydex being discussed a few weeks ago but until I went on their site, I never realized all the things that can be made with it. It certainly appears it should work and Warren’s idea for the insulation looks like it would work.

Using the single sided insulation inside the engine cover could also help. I would like to know how thick the stuff is.

Anybody have any ideas on how thick of a sheet of Kydex I would need? I was thinking of a ¼ inch.
________
Dave dlt.gif
 
Mike – Aerogel looks like it would work, but is un-available in anything except small granular pieces. I wonder if it would work if several layers of grains were glued to the inside of the engine cover or to a cover of Kydex over the engine.

It seems to me if Aerogel was used it would have to have a protective coating over it to keep it from chipping off. Would it then still have the sound insulating qualities?


Jimbo – adding a bulkhead to the 16 Cruiser is all but impossible and it would make the cabin way too cramped.
________
Dave dlt.gif
 
dotnmarty":1wmt1lov said:
Here's an alternative
http://www.bose.com/controller?event=VI ... egory&ck=0
Click to expand...
Marty - I read all I could find about the Bose noise cancelling headphones and still am not sure what they do. Head phones that block all sound, the radio and people’s conversation will not help.

If they are not plugged into a radio can you still hear it?

They are kind of expensive but if they block engine and water noise but not radio and conversation they may be worth it. It would be $600 for the two of us.

Anybody have any experience with them?
________
Dave dlt.gif
 
Dave,
I occasionally fly with my boss, and we use headphones with intercom mic's in the plane. Maybe, the VHF's could be set up like the plane set. On the question about Kydex thickness. I'm pretty sure it comes in 1/8, 3/16, and 1/4. It is realativly easy to heat mold and can be worked (cut, drilled, sanded) cold. I don't know about welding, I think not. but it is quite durable. As with a lot of plastics, it may have issues with vibration. Wish you the best with this new project.
Harvey
SleepyC :moon
 
oldgrowth":j97b2l8h said:
Anybody have any experience with them? [/b][/size][/color]_______
Dave dlt.gif
Click to expand...

Dave, we utilize earphones now on all of our emergency apparatus in the fire service to "deaden" the noise of the siren and airhorn. They also come equipped with a "push to talk" button on the earphones so you can transmit over your radio. All personnel in the unit are able to converse with them in normal conversation.

Additionally, we have the same set-up on our Fire/Rescue boat. One of the headsets has an extended cord so that the firefighter operating the water cannon located on the vessel's bow can communicate with the helmsman. (The Hale water pump on the bow makes A LOT OF NOISE!, making it impossible to carry on a conversation without the headsets).

After my 30 years under sirens, I can't hear much anyhow......particularly my wife when she talks to me... :roll:
 
I want to thank all you people for your comments and ideas in ways of solving my engine noise. I like the idea of solving the noise problem at the source, instead of at my end. I still have a little research to do but it will be more on the ideas put forth by Warren, Ken, Mike or Bob. I would like to find a local supplier of some of these products so I can see them and have a better idea of what it is and how to build the enclosure.

thataway":32g8zas8 said:
There are specific kits for lining the cowlings of outboards with this type of material.
Click to expand...
Bob – do you know where I might find some information on one of these?
________
Dave dlt.gif
 
I experienced the SAME problem as many of you on my 16' Angler. As a prototype (it has been on my boat now for 2-years) >> as it Does work pretty dang good. :)

I used "foam-core" board that you can buy at your local Lowes or Home Depot.

Email me for pictures... mattea11@comcast.net
 
Ooops >> I forgot to say WHAT my "prototype" was... I built a Noise Reducer Bulkhead - that spans across the motor well. It is not too "pretty" (aesthetic's wise) but it does work well. Cuts the cabin reverberation by about one-half.

I don't yet know how to attach pictures to this post...so if you want some pictures, please email me at: mattea11@comcast.net


Dave T.
Brier, WA
 
Back
Top