[DeTomaso] Fwd: Re: dyna mat

[Dave Londry]

Very true - I was just afraid of getting into anti-nodes and poles and 
zeros etc.

On 2020-05-24 12:59 p.m., John Maloney wrote:
>
> Dave,
>
> Your e-mail on Dynamat is excellent. However, what you refer to as 
> nodes are called anti-nodes. Nodes are points at which there is no 
> motion in that mode of vibration.
>
> John #3269
>
> Retired Structural Dynamist
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for 
> Windows 10
>
> *From: *Dave Londry <mailto:davel at trguys.com>
> *Sent: *Sunday, May 24, 2020 12:32 PM
> *To: *detomaso at server.detomasolist.com 
> <mailto:detomaso at server.detomasolist.com>
> *Subject: *Re: [DeTomaso] dyna mat
>
> Our good buddy with the Mangusta (factory small-block chevy), Dick
>
> Ruzzin, gave me a great lesson on placing sound deadening material.
>
> The point is to locate the Dynamat at the nodes (places where the
>
> vibration amplitide is greatest) and just enough of it to 'kill the buzz'.
>
> It all takes some messing around, like driving around with no door
>
> panels installed and nothing on the inner roof.
>
> And, the pressure of a one thumb in the right place will simply kill one
>
> vibration mode.
>
> I got the doors well with one 3"x 8" piece horizontally in the middle of
>
> each door.
>
> I needed to drive the car over to Detroit to have the master do the
>
> roof, but that would be 2500 miles each way.
>
> On my own I did get it well damped, with four 6" x  6" pieces spread in
>
> a square, but I know he'd have used much less.
>
> The roof had about 4 modes that I kept chasing around for several hours
>
> until i just threw extra material at them.
>
> Dave
>
> On 2020-05-23 10:20 a.m., David wrote:
>
> >     Mr. Finch,
>
> >
>
> >
>
> >     As an experiment I used a "dyna mat" type product on the ceiling 
> of my
>
> >     hot rod truck when I had the headliner (a piece of card board) out.
>
> >     Poo, can't find the video comparison . . . .
>
> >
>
> >
>
> >     You don't need to cover every inch, just a piece across the 
> roof, you
>
> >     will be amazed. My old truck lives outside, the stuff never 
> comes off.
>
> >
>
> >
>
> >     David in Durango
>
> >
>
> >
>
> > _______________________________________________
>
> >
>
> >
>
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>
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>
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>
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>
> -- 
>
> Dave Londry
>
> TRGuys.com
>
> davel at trguys.com
>
> Cell     604-721-2278
>
> Skype    embeddedspaces
>
-- 
Dave Londry
TRGuys.com

davel at trguys.com
Cell     604-721-2278
Skype    embeddedspaces

-------------- next part --------------
   Very true - I was just afraid of getting into anti-nodes and poles and
   zeros etc.
   On 2020-05-24 12:59 p.m., John Maloney wrote:

   Dave,


   Your e-mail on Dynamat is excellent.  However, what you refer to as
   nodes are called anti-nodes.  Nodes are points at which there is no
   motion in that mode of vibration.


   John #3269

   Retired Structural Dynamist


   Sent from [1]Mail for Windows 10


   From: [2]Dave Londry
   Sent: Sunday, May 24, 2020 12:32 PM
   To: [3]detomaso at server.detomasolist.com
   Subject: Re: [DeTomaso] dyna mat


   Our good buddy with the Mangusta (factory small-block chevy), Dick

   Ruzzin, gave me a great lesson on placing sound deadening material.


   The point is to locate the Dynamat at the nodes (places where the

   vibration amplitide is greatest) and just enough of it to 'kill the
   buzz'.

   It all takes some messing around, like driving around with no door

   panels installed and nothing on the inner roof.

   And, the pressure of a one thumb in the right place will simply kill
   one

   vibration mode.


   I got the doors well with one 3"x 8" piece horizontally in the middle
   of

   each door.

   I needed to drive the car over to Detroit to have the master do the

   roof, but that would be 2500 miles each way.

   On my own I did get it well damped, with four 6" x  6" pieces spread in

   a square, but I know he'd have used much less.

   The roof had about 4 modes that I kept chasing around for several hours

   until i just threw extra material at them.

   Dave


   On 2020-05-23 10:20 a.m., David wrote:

   >     Mr. Finch,

   >

   >

   >     As an experiment I used a "dyna mat" type product on the ceiling
   of my

   >     hot rod truck when I had the headliner (a piece of card board)
   out.

   >     Poo, can't find the video comparison . . . .

   >

   >

   >     You don't need to cover every inch, just a piece across the roof,
   you

   >     will be amazed. My old truck lives outside, the stuff never comes
   off.

   >

   >

   >     David in Durango

   >

   >

   > _______________________________________________

   >

   >

   > Detomaso Email List is not managed by POCA

   > Posted emails must not exceed 1.5 Megabytes

   > DeTomaso mailing list

   > [4]DeTomaso at server.detomasolist.com

   > [5]http://server.detomasolist.com/mailman/listinfo/detomaso

   >

   > To manage your subscription (change email address, unsubscribe, etc.)
   use the links above.

   >

   > Members who post to this list grant license to the list to forward
   any message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.


   --

   Dave Londry

   TRGuys.com


   [6]davel at trguys.com

   Cell     604-721-2278

   Skype    embeddedspaces



--
Dave Londry
TRGuys.com

[7]davel at trguys.com
Cell     604-721-2278
Skype    embeddedspaces

References

   1. https://go.microsoft.com/fwlink/?LinkId=550986
   2. mailto:davel at trguys.com
   3. mailto:detomaso at server.detomasolist.com
   4. mailto:DeTomaso at server.detomasolist.com
   5. http://server.detomasolist.com/mailman/listinfo/detomaso
   6. mailto:davel at trguys.com
   7. mailto:davel at trguys.com