[NSRCA-discussion] Soft Mounts (Beam)

[Karl G. Mueller]

Lance,

I think you are talking about the round Lord mounts.
Paul is talking about the rectangular shape ones with the 2 holes
drilled thru to mount the engine beams.

Karl G. Mueller
kgamueller at rogers.com

  ----- Original Message ----- 
  From: Lance Van Nostrand
  To: NSRCA Mailing List
  Sent: Saturday, December 15, 2007 11:06 AM
  Subject: Re: [NSRCA-discussion] Soft Mounts (Beam)


  Sorry to be naive but a bolt screwed into rubber will not easily pull out?
The DB isolators have an embedded blind nut in them.

  I've been using isolators from mcMaster that are virtually the same as the
DB ones.  McMaster has the advantage of offering male/male fem/fem or the
male/fem we are used to.

  --Lance

    ----- Original Message ----- 
    From: Paul LaChance
    To: NSRCA Mailing List
    Sent: Friday, December 14, 2007 6:37 PM
    Subject: Re: [NSRCA-discussion] Soft Mounts (Beam)


    Lance and others interested,

    Find a bet that is bigger than the isolator in all direction.  Mine was
for the blade drive on a riding mower.  I cut the pieces to the original
dimentions using a scroll saw.  The I drilled the holes in the rubber with a
small drill bit and worked my way up to the right size.  It takes SEVERAL
times drilling with the correct size drill bit to actually open the hole
properly.  The rubber will keep trying to strech instead of letting the bit
drill cleanly.  Then, mount as usual.  I have used these home made isolator
for about 20 flights with no sign of wear.  Until that time they were
cracking or turning into gummy bears about 1 a day, so every 4 days of
flying required all 4 isolators to be replaced.

    Strangly I never had this problem about 10 years ago.  I do not know if
they changed the rubber they were made from, but the new rubber does not
last like the old rubber did.  Also the ones for World Engines brand mounts
work but are VERY hard and stiff.  They shook the plane terribly and had to
be removed after 2 flights.

    Paul
      ----- Original Message ----- 
      From: Lance Van Nostrand
      To: NSRCA Mailing List
      Sent: Friday, December 14, 2007 7:28 PM
      Subject: Re: [NSRCA-discussion] Soft Mounts (Beam)


      Paul, intersted in more details of how you fabricated an isolator from
a belt.

      Still, anyone melting vulcanized rubber has some serious cooling
problems.

      --Lance

        ----- Original Message ----- 
        From: Paul LaChance
        To: NSRCA Mailing List
        Sent: Friday, December 14, 2007 6:10 PM
        Subject: Re: [NSRCA-discussion] Soft Mounts (Beam)


        I had the same thing happen.  Even a new set just purchased did the
same thing.  I ended up making my own out of a belt for a riding mower.  The
belt was $10 and you could probably make about 100 isolators out of it.  The
good thing is it is designed to take the heat and be break resistant.  The
cloth molded into it makes it almost impossible to tear.  Just make sure you
cut the piece to shape and drill the holes accurately.  I used the home made
isolators at the Triple Tree contest this year.  Give it a try.  It seemed
to have the damping as the priginal isolators.

        Paul
          ----- Original Message ----- 
          From: Bill Thompson
          To: nsrca-discussion at lists.nsrca.org
          Sent: Friday, December 14, 2007 6:47 PM
          Subject: [NSRCA-discussion] Soft Mounts (Beam)


          Has anyone had the rubber for these mounts soften and melt. This
is the second time in the last year it happened.The mounts are MK using Dave
Brown VibaDamp 4/C Isolators.
          BillT


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