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When we did the original restoration on our F-26, we added sound insulation to the bottom side of our cockpit floor and hatches to help reduce engine noise. Since the floors and gunnels are fiberglass they don't suppress sound very well on their own. The insulation under the floors helped a little however recently I realized that a large part of the engine noise was coming from the sound resonating between the outside hull of the boat and the cockpit wall (gunnel). This area is open to the engine bay.
I decided to try a little experiment. I took some 1 1/2" thick insulation and cut strips wide enough to fit between the inner cockpit wall and the outer hull at the floor level only in the cockpit. I cut them large so that they would hold themselves in place. I did this across the transom and up both sides from the transom to the first set of bulkheads. This was as far as I could reach. I did leave a couple small areas open to still provide ventilation.
The result is less sound resonating in the gunnels and a 20 db noise reduction in the cockpit. The job took just over an hour.
If you're looking for effective sound suppression in the cockpit, this works great. Be sure to allow some ventilation though.
Paul
"Cruise Control" 1978 F-26HT
"No Control" 2012 9' Grand RIB
I've convinced my wife that "there's nothing like the sweet sound of an inboard engine at 3200 rpm". The boat underway is the only place where she gives up talking.....
The 10 Meter has factory sound insulation in the cockpit floor and inside all the gunnels, even those aft.
Doesn't kill all the sound, just takes off the "edge"
RWS
1983 10 Meter SOLD after 21 years of adventures
Yanmar diesels
Solid Glass Hull
Woodless Stringers
Full Hull Liner
Survived Andrew Cat 5,Eye of Charley Cat 4, & Irma Cat 2
Trojan International Website: http://trojanboat.com/
This is what I did on my F32... at 3200 rpm it is comfortable to be in the salon while underway!
From Wilrep on Matheson Blvd, Mississauga
Behind engine bulkhead under aft deck from side to side I used:
F200 http://www.wilrep.com/WilrepDataSheets/ ... orbF/F.htm
Easy to put in you just cut to manageable strips to allow it to be glued to underside of deck/floor and spray on the glue and push in place.
Michael
Rum is the reason Pirate's have never ruled the world
Done Dreamin'
1987 President 43' Twin Lehman 225SP Turbo
Highfield 310 Ally 15 HP Yamaha 2cycle
1978 F32 Sedan twin 318 Chry SOLD
Safe Cove Marina, Port Charlotte, FL
Do you know what material was used for sound insulation on your boat?
======================================
The factory insulation is a foam style with a foil type exterior backing.
I left the factory insulation alone and went over top of it with Soundown brand insulation that contains a thick layer of composite underlayment.
It is specifically designed for marine engine rooms.
The product is so heavy it had to be supported with fasteners and oversized fender washers.
End result:
The diesels and diesel genset are quieter than the 454's and the Onan.
Good results.
The only negative is the added weight,m, however we really don't consider tyhat an issue.
RWS
1983 10 Meter SOLD after 21 years of adventures
Yanmar diesels
Solid Glass Hull
Woodless Stringers
Full Hull Liner
Survived Andrew Cat 5,Eye of Charley Cat 4, & Irma Cat 2
Trojan International Website: http://trojanboat.com/
Big D wrote:Michael, I'm not familiar with that flammability rating. Is it rated for engine spaces?
From their website: Use for engine compartments.
3150 0.88 0.85 1.05 Flammability: MVSS 302 – Passes, UL94 HF-1 – Passes
That rating (302) is federally mandated for passing in the automobile applications. So I suspect that their rating, Marine Vessel Safety Standard 302 (MVSS 302) is their standard as well.
Standard No. 302 - Flammability of Interior Materials - Passenger Cars, Multipurpose Passenger Vehicles, Trucks, and Buses
(Effective 9-1-72)
This standard specifies burn resistance requirements for materials used in the occupant compartments of motor vehicles. Its purpose is to reduce deaths and injuries to motor vehicle occupants caused by vehicle fires, especially those originating in the interior of the vehicle from sources such as matches or cigarettes.
Jamie
1985 F-32 270 Crusaders
1988 Sea Ray 23 350 Merc.
Trojan. Enjoy the ride...
-I don't wanna hear anyone whine...Anymore!
-You might get there before me, but you still have to wait for me, for the fun to start!
obeejr wrote:Did you cut it to fit between the ribs under the cockpit floor, or apply as one sheet over the ribs?
Over the ribs.. sorry for late reply been away looking at boats in Middle River, Annapolis and Kent Island. Lake Guntersville, Alabama this weekend... don't ask not Trojan's.
Michael
Rum is the reason Pirate's have never ruled the world
Done Dreamin'
1987 President 43' Twin Lehman 225SP Turbo
Highfield 310 Ally 15 HP Yamaha 2cycle
1978 F32 Sedan twin 318 Chry SOLD
Safe Cove Marina, Port Charlotte, FL