[NSRCA-discussion] Nose Ring

[jivey61 at bellsouth.net]

Thanks Dave,I was only sleeping part of the time.
 Have a Merry and Happy also

Jim Ivey

  ----- Original Message ----- 
  From: DaveL322 at comcast.net 
  To: NSRCA Mailing List 
  Sent: Thursday, December 22, 2005 11:17 AM
  Subject: Re: [NSRCA-discussion] Nose Ring


  The job of the nosering is indeed to keep the engine aligned - if it does not, you are allowing additional movement which may or may not be effectively absorbed by the mount.

  In a very basic sense, airframe noise is from energy transmitted to the airframe from the vibration of the engine.  I've seen 0.5-1db reduction in noise when a loose O-ring in the nose ring was replace with a fresh O-ring....and subjectively, the airplane had a nicer sound, appeared to be shaking less, and felt to be shaking less.  If the engine can move within the nosering, it "bangs" once it hits the nosering.

  Regards, and Happy Holidays,

  Dave
    -------------- Original message -------------- 
    From: <jivey61 at bellsouth.net> 

    But Dean!
    My learning of this, was that, the torsional forces are absorbed by the main mount,whatever configuration and the nose ring is used to keep the crankshaft from wobbling up-dn,left-right.It seems that a tight nose ring transfers  more of the bang to the fuse and creates more noise.  I guess some mounts need  help with the torsional forces by tightening the nose ring.
    Was I sleeping in class?

    Jim Ivey
      ----- Original Message ----- 
      From: Dean Pappas 
      To: NSRCA Mailing List 
      Sent: Thursday, December 22, 2005 10:00 AM
      Subject: RE: [NSRCA-discussion] Nose Ring


      Hi,
      A tight nose ring offers some friction damping to the large movements that only happen at idle.
      My typical soft mount actually uses a clamping nosering, to dial inn that friction loss.
      A Merry Bah Humbug to all! (vbg)
              Dean

      Dean Pappas 
      Sr. Design Engineer 
      Kodeos Communications 
      111 Corporate Blvd. 
      South Plainfield, N.J. 07080 
      (908) 222-7817 phone 
      (908) 222-2392 fax 
      d.pappas at kodeos.com 

        -----Original Message-----
        From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Tomc at buyrc.com
        Sent: Wednesday, December 21, 2005 7:49 PM
        To: 'NSRCA Mailing List'
        Subject: RE: [NSRCA-discussion] Nose Ring


        I used the new silver one and had to remove the hub to get it to slide on. It's very tight, but I think works better than the looser one.




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        From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of jivey61 at bellsouth.net
        Sent: Wednesday, December 21, 2005 1:25 PM
        To: NSRCA Mailing List
        Subject: Re: [NSRCA-discussion] Nose Ring



        Dave

         Either one will work.I would prefer a little loose.The gold nose ring isn't available any more. That is reason to sell the new solid alum. version.  Actually I run a Webra 145 with no nose ring The AR mount is stiff enough to do this with a 2 S.



        Jim Ivey

          ----- Original Message ----- 

          From: Dave Smith 

          To: nsrca-discussion at lists.nsrca.org 

          Sent: Wednesday, December 21, 2005 3:06 PM

          Subject: [NSRCA-discussion] Nose Ring



          I think I sent the following to the wrong address. If so,my apologies.



          I have a Central Hobbies nose ring (the one that is silver coloured and tapped for mounting bolts).

          It fits my OS 140 tightly.



          I also have the older gold coloured nose ring that has a very slight amount of clearance between it and the engine crankcase

          Engine mount is a Hyde AR.



          I don't think the tight nose ring is the way to go,but I might be wrong.

          Anyone use this tight ring?   Opinions please.



          Thanks,,,,,,Dave


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