Earthstar Forums

Hi Mark
Now that is interesting to hear. I thought my meter was wacky but everytime I checked it said the same thing. I do have the (I assume) factory bulkhead with foam and material blocking the back compartment.
Before I did the metering I would have guessed most of the noise was coming from the back and from the wing overhead.
My next test will be with the mic behind the back bulkhead. Wonder how high that will be.
Thanks
Fred

Well Guys I think we are going to get someplace with sound deadening if we all share our ideas.
If you are really interested in sound deadening go to this site and listen to what this guy says and play the video demonstrations.
http://www.sounddeadenershowdown.com
I think he has the best ideas yet that I have found in my research on the net.
Including what sounds crazey for an airplane"foam-lead-foam sandwich" The lead seems super thin and maybe that is what should be
used under the engine firewall and up the back of the wing to block all direct noise from the engine. Aparently almost nothing will go through lead sheet. Well you read it for yourself.
What do you think?
Fred

Thanks Gary
That is good to know. I will do some experimenting with the stuff.
Fred

In a message dated 9/28/2011 1:15:54 PM Pacific Daylight Time,
gayford@golden.net writes:

Hi Mark
Now that is interesting to hear. I thought my meter was wacky but
everytime I checked it said the same thing. I do have the (I assume) factory
bulkhead with foam and material blocking the back compartment.
Before I did the metering I would have guessed most of the noise was
coming from the back and from the wing overhead.
My next test will be with the mic behind the back bulkhead. Wonder how
high that will be.
Thanks
Fred




Hi Fred
the noise sours is from the back, but it is being reflected and sent back
in a manner that is not good for your ears. The rear wall needs to be
sealed, no holes at all. The propellor has a low pressure bubble that travels on
the forward surface of the blade and that bubble hits the side of the plane
like a drum, glue insulation or carpet to the inside of the shell if you
have a fiberglass shell or the fabric if you have an older model J. This is
like gluing a carpet to the inside of a drum and than hitting it with and
drum stick, not much noise.
Happy Flying
Mark

Good idea
I will have to try that also.
Thanks
Fred

Hi Gary
What kind of carpet are you using? I suppose it would have to be very light in weight. I have seen some Titans with a nice light weight looking grey carpet and always wondered what it is called. Is it some kind automotive trunk carpet ? It looks to be about a 1/8th of an inch thick.
Thanks
Fred

Light weight boat carpet is what we use.
Happy Flying
Mark


In a message dated 10/2/2011 7:23:59 P.M. Pacific Daylight Time,
gayford@golden.net writes:




Hi Gary
What kind of carpet are you using? I suppose it would have to be very
light in weight. I have seen some Titans with a nice light weight looking grey
carpet and always wondered what it is called. Is it some kind automotive
trunk carpet ? It looks to be about a 1/8th of an inch thick.
Thanks
Fred

--- In _Earthstar_Aircraft@yahoogroups.com_
(mailto:Earthstar_Aircraft@yahoogroups.com) , Gary <gjcarter34@...> wrote:
>
> Fred,
>
> The Earthstar can be very quiet inside by adding sound proofing. To my
odyssey I added very light weight .25 inch aluminum padding. This is spray
glued to the back side, floor and top area in the back section of the
fuselage. The padding has air pockets the same as bubble wrap. To separate the
back compartment from the front I have 1 inch sound deadening panel wrapped
in white vinyl (see my picture of this in the photo section under Gary's
Odyssey). The panels wedge into position and hold with Velcro. The right side
panel pulls out to allow access to the baggage area. Above my head on the
wing I spray glued .25 inch foam fabric, and the floor has spray glued
carpet. I know it's quiet because people who go up with me tell me so. The new
buyer of the plane likes to go up with me without using the headsets, and we
can talk to each other just fine, though I still like the headsets.
> Mark is bringing me a new kit to build and I will be focused on making
this one quiet so any information will be helpful to all.
>
> Gary
>
>
>
>
>
>
>
>
>
> On Sep 27, 2011, at 8:38 PM, "Fred" <gayford@...> wrote:
>
> > Hi Kess
> > I bought one of those muffs from aircraft spruce and gave it a try
tonight. This one had a foam piece that went on and then the leather piece
went over that. The instructions said that the foam forms a kind of sound
chamber in the leather. There is a hole in the front and one in the back.
> > Results may vary but for me there was a dramatic improvement. I have
the noise cancelling Telex 50D head sets.I am very happy with the MGL V10
radio as well.
> > I modified my db meter and took it up for a test as well. I have a 6
foot extention for the mic and just aimed it in different directions to see
what would happen. I don't know what is going on yet for I had strange
results. The noisiest direction was the front wind screen and dash also the
floor in front of the pilots seat. When I aimed it at the side windows it was
very much lower on the scale. I pointed it back as far as I could reach and
the noise level was higher than the side screens but lower than the front
of the plane.
> > I don't get it? Perhaps I am getting air movement from the wheel
opening, But that wouldn't explain the dash and the front canopy.
> > Oh well I need to do more investigation. A foam wind sock for starters.
> > I will keep you posted.
> > Fred
> >
> > --- In _Earthstar_Aircraft@yahoogroups.com_
(mailto:Earthstar_Aircraft@yahoogroups.com) , "kessb" <kessb@> wrote:
> > >
> > > It's a little leather boot that slips over the mike, with the back
side covered up, and the front side at the mouth side open. If you also
position the mike with muff right up against your lips, the transmissions are
quite clear. It got it at the Arlington Fly-In years ago from Oregon Aero
for 10 bucks I think. Check out their web site.
> > >
> > > kb
> > >
> > >
> > > ----- Original Message -----
> > > From: Fred
> > > To: _Earthstar_Aircraft@yahoogroups.com_
(mailto:Earthstar_Aircraft@yahoogroups.com)
> > > Sent: Thursday, September 22, 2011 6:02 PM
> > > Subject: [Earthstar_Aircraft] Radio update MGL V10
> > >
> > >
> > >
> > > I installed my new red tail bent antenna about 4 inches back from
the regular mounting spot. Also installed a really high quality coax cable.
> > > I ran it up the door side of the front canopy. (to keep it away from
other wires)
> > > It did seem better. Experimenting I smoothered the microphone
completely with my hand and boy did the noise in my head phones decrease a lot.
> > > I went into preferences in the radio and turned the mic sensativity
down which help lower the noise a bit when I uncovered the mic.
> > > Of coarse when you go to a lower power setting things also improved.
> > > Kess you talked about some kind of muff you put on the mic. I think
that is something I need to try. Can you give us a description of what you
did? Thanks
> > > Fred
> > >
> >
> >
>

Fred,

Ozite is a light weight carpet sold in small rolls but large enough for our planes. This can be found at local walmart or pep boys, places like these.
Automotiveinteriors.com Also has a variety of carpeting that will work good for noise suppression if glued to your floor, it is heavier but more durable.
The boat carpeting that Mark recommends should be good too, maybe check at a marina.

Gary

I got some nice lightweight marine carpet that looks like stock Thunder Gull, from Cabelas. They will send you samples if you call and ask.

Thanks Mark
I will check that out tomorrow.
Fred