TEST- now motor mount Poll

[Wayne Galligan]

Firing stroke impulse, inertia from moving parts, size of components(prop, piston,square of stroke)  all have an effect on vibration.  I have been trying a few things in search of that all elusive vibration free setup. Does a 3 blade prop run smoother then a 2 blade prop? I have been making nose rings out of 1/8" urethane sandwiched between 1/32" ply.  The urethane holds the nose in place without having to have too snug of a fit at the crank end and it so far doesn't seem to wear as quickly as lined nose rings.  On my Entropy with an OS 1.40 is super smooth and quite at idle and through most of the rpm range.  My Aries with the Mintor 1.70 bangs like a 4-stroke at idle and there was a noticeable reduction in vibration when I switched the nose rings.  I make a home made soft mount using Bob P. instructions and it weights about 3.3 oz and handles the Mintor quite well. 

you can view it at this link

http://www.rcuniverse.com/gallery/galleryCat.cfm.cfm?memberID=6463&CFID=862285&CFTOKEN=3b3a471-7dc5463c-19d1-4704-bd2f-605a2511e969

Wayne G.

  ----- Original Message ----- 
  From: ronlock 
  To: discussion at nsrca.org 
  Sent: Saturday, January 03, 2004 8:05 AM
  Subject: Re: TEST- now motor mount Poll


  The rotational impulse from the firing stroke is a much stronger vibration
  source than the reciprocating parts.   That's one of reasons the 4 strokes
  vibrate more, each firing stroke is stronger than in a 2 stroke that fires
  twice as often.

  Later, Ron Lockhart
    ----- Original Message ----- 
    From: Jeff Hughes 
    To: discussion at nsrca.org 
    Sent: Saturday, January 03, 2004 12:22 AM
    Subject: Re: TEST- now motor mount Poll


    I'm not sure I understand, shouldn't we be more concerned about up and down and side to side motion of a single cylinder engine, rather than the rotational (torque) motion? I would think most of the vibration is from the counterweight and piston motion, not firing torque?

      ----- Original Message ----- 
      From: Ed Miller 
      To: discussion at nsrca.org 
      Sent: Friday, January 02, 2004 3:49 PM
      Subject: Re: TEST- now motor mount Poll


      Hanson Rotomount and Clayton Foster nose ring get my vote. The Rotomount can be made very light and it's adjustable for firmness and thrust angle. I've had 5 planes with it without any problems. Works on the same principle as the Hyde mount in that it allows the engine to rotate along the crankshaft centerline. A side benefit is it costs less than 10 bucks to make. 
      Ed M.
        ----- Original Message ----- 
        From: Nat Penton 
        To: discussion at nsrca.org 
        Sent: Friday, January 02, 2004 5:02 PM
        Subject: Re: TEST


        Bill I believe if we could get people to convey their likes and dislikes on engine mounts we could all benefit. (At least we would'nt have to bring up the downwind turn).       Nat----- Original Message ----- 
          From: William C. Harden 
          To: discussion at nsrca.org 
          Sent: Friday, January 02, 2004 3:16 PM
          Subject: RE: TEST


          Quite on the list today, isn't it?

           

          Bill

           

          -----Original Message-----
          From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Dwayne & Nancy Brown
          Sent: Friday, January 02, 2004 12:34 PM
          To: Society of Antieque Modelers; Slow Flight RC; Senior Pattern Association; Pattern List; Pattern; GSAL
          Subject: TEST

           

          TEST

           

          Dwayne
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