Sound- absorption or reflection

[Ernie Ekberg]

Thanks, Bill, very good information. The worst part of the generators that some of us have is that the fan is belt driven off the engine. Ernie Ekberg 83PT40 Wanderlodge Weatherford, Tx http://autos.groups.yahoo.com/group/erni...gandrepair --- On Sat, 2/21/09, Bill Garamella wrote: From: Bill Garamella Subject: [WanderlodgeForum] Re: Sound- absorption or reflection To: WanderlodgeForum@yahoogroups.com Date: Saturday, February 21, 2009, 12:35 PM Last year I insulated the doghouse of our 1983FC doghouse with 2" 2#/ft. sq. fiberglass and lead material that I purchased from Soundown. I followed the instructions provided by their rep Gary Kissal and am very happy with the results. I have been speaking with Gary on how best to quiet down the 12.5 Yanmar/Kohler and he suggested several things: To quiet outside noise, create a baffle between the fan and the exhaust louvers. To quiet inside: 1. Apply mechanical fasteners to all surfaces to be covered 2. Apply adhesive damping material against the metal inside the generator compartment. "Soundown Vibration Damping Sheets and Tiles are a high performance, easily applied, extensional vibration dampers for reducing structural reverberant "ringing" and structureborne noise. This material is effective on a wide range of substrates, especially fiberglass, aluminum, and steel. Soundown Damping Sheets are available in 1/16", 1/8", 1/4" at 54" width, and in 1'x 1' tiles in 3/8" and 1/2". We also stock a complete line of interlayer damping materials for many applications. " 3. Apply 2" 2# ft./sq. composite insulation onto the damping material using both mechanical fasteners and adhesive. "Soundown's Mass Loaded Vinyl Barrier (Tuff Mass®) is available in 1/2, 1, 1-1/2, and 2 lb/ft2 densities. It is a rugged all-purpose sheet barrier with a wide range of uses. Our Mass Loaded Vinyl is supplied in a standard 54" and 48" width and variable roll lengths from 10' to 250' depending upon material configuration. Soundown Acoustic Lead Barrier is available in weights of 1 and 2 lb. This traditional incombustible barrier material is supplied in a standard 48" width, and rolls of 12', 24', or longer as required." I have no material interest in the company other than being a very satisfied customer. Their exclusive function is to quiet things down and they have been doing it for a very long time with very expensive marine craft, and high end structures. Here is a link to their web site. http://www.soundown .com/AI.htm# Garry Kissal's e-,mail is "gkissal%40soundown.com" In lieu of the baffle which I think will be too much work, I plan to install a quiet plastic DC fan to the radiator (like in a car) and an aqua-stat that will keep the big AC fan off until higher temps are reached. I suspect this will help a lot and much of the time we run our genset at way less than half load. Another factor is the use of a ProSine 2K inverter that also helps to minimize gen run time. NH Bill 1983 FC "Casa Billisa" --- In "WanderlodgeForum%40yahoogroups.com", "Stephen Birtles" wrote: > > if you look at the newer generators the sound deadening box has > baffled vents and is sealed as well as sound deadening > materials,thermosta tically controlled fans and a smaller new motor > with indirect indirect injection. With all these it makes for a > quieter generator > > Stephen 77fc35 > > > > --- In "WanderlodgeForum%40yahoogroups.com", Ernie Ekberg > wrote: > > > > Jim, while the some of the noise was deflected down, 30 more db was > reflected to the front of the radiator. Bob's coach has the front > fan/radiator. > > > > > > Ernie Ekberg > > 83PT40 > > Wanderlodge > > Weatherford, Tx > > http://autos. groups.yahoo. com/group/ erniesremodeling andrepair > > > > --- On Fri, 2/20/09, jim riordan wrote: > > > > From: jim riordan > > Subject: Re: [WanderlodgeForum] Sound- absorption or reflection > > To: "WanderlodgeForum%40yahoogroups.com" > > Date: Friday, February 20, 2009, 10:01 PM > > > > > > > > > > > > > > > > > > > > > > > > I would assume that the sound deading material used in these > generator compartments actually reflect the nooise down. so the noie > is forced under the coaches. Many boats and I belive that some new > coaches now have a box lined with sound deading which the generator is > placed. > > > > just a thought > > > > jim riordan > > 88 wbwl xxv > > stuart fl > > > > --- On Fri, 2/20/09, Ernest Ekberg wrote: > > > > From: Ernest Ekberg > > Subject: [WanderlodgeForum] Sound- absorption or reflection > > To: WanderlodgeForum@ yahoogroups. com > > Date: Friday, February 20, 2009, 7:43 PM > > > > > > > > > > After installing many generator compartments with the new insulation, I > > was wondering if there is a manufacturer that offers both. > > I insulated Bob Lawrences' generator compartment last December. He > > measured the db levels before and after and found that while the heat > > was reflected from the interior of the coach, the sound was also > > deflected to the outside. thus his db levels INCREASED to over 90. > > I know my with my coach, that I have been asked to park way downwind as > > my generator is really loud. Maybe its the dogs I carry with me??? > > But, if there is a product that will absorb that sound while reflecting > > the heat, let's talk about it. > > Ernie-83PT40 in Texas, buying earplugs by the case~ > > >