[NSRCA-discussion] Soft Mounts (Beam)

[Paul LaChance]

Jason,

Never thought of trying that.  I bet it would work.  It would make the rubber hold it's shape so it would be easier to cut and drill.  I will not be using those mounts next year, so it will not be a problem.  I did want to help others still using those mounts make a better alternative.  Plus the 4 DB isolators are $10 and you can make almost 100 for the same price.  Good luck for those giving it a try.  I was glad I made them.  

Paul
  ----- Original Message ----- 
  From: JShulman 
  To: NSRCA Mailing List 
  Sent: Friday, December 14, 2007 7:48 PM
  Subject: Re: [NSRCA-discussion] Soft Mounts (Beam)


  Just throwing this out there, but at one time I was told that if you freeze DB wheels, you could reshape them. What would happen if you froze the pieces of rubber before cutting and drilling them?

  Regards,
  Jason
  www.jasonshulman.com
  www.shulmanaviation.com
  www.composite-arf.com 

    -----Original Message-----
    From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Paul LaChance
    Sent: Friday, December 14, 2007 7:38 PM
    To: NSRCA Mailing List
    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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