Why is it so quiet?

[John Ferrell]

I have found that any engine that displays obstinate tendencies can be helped by reducing the prop load. Frequently the problem disappears after a few flights with the reduced load. Sometimes the engine just settles in to this new operating point. My guess is that something in the engine is warped/worn or just not broken in.

This is especially true of a YS with a critical needle.


John Ferrell    
http://DixieNC.US

  ----- Original Message ----- 
  From: Ed Hartley 
  To: discussion at nsrca.org 
  Sent: Tuesday, December 28, 2004 10:48 PM
  Subject: Re: Why is it so quiet?


  Well I used YS for a lot of years with some success. I moved to the OS 140RX and sold all the YS parts and engines I had after one failure to many at a contest. This engine has one-hundred seventy odd flights and it still runs as when new. It turns the APC four blade 15.5x12 at 8000 rpm and idles all day at 1300. (25% Mach VII). Hard to beat that. For those interested in two strokes check my personal site http://www.rcpattern.com/2cycle.htm 
  I had an interesting experience at the field a few weeks ago. One of our club members had the latest YS 140 fresh out of the box and couldn't get it to run. First off he had some kind of a four blade wooden prop which was so far out of balance the engine didn't have a chance. I loaned him one of my four blades and it would run for about thirty seconds or so turning about 6500 and quit. Now he tells me the YS folks told him this was to much prop for the engine. He went to a something smaller two blade and tells me it's running fine now. Go figure! I would have thought for the money it should at least run on the four.

  Ed
    ----- Original Message ----- 
    From: William C. Harden 
    To: discussion at nsrca.org 
    Sent: Tuesday, December 28, 2004 9:50 PM
    Subject: RE: Why is it so quiet?


    I have to agree.  Darn expensive engines the YS DZ are.

     

     

    -----Original Message-----
    From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Bob Pastorello
    Sent: Tuesday, December 28, 2004 8:48 PM
    To: discussion at nsrca.org
    Subject: Re: Why is it so quiet?

     

    You have less than 3 days, then.  Could be tricky for you.

    Besides, how does one "try" something that costs $700+  ?  Sounds a bit like "testing" the $3500 plasma tv.....


    Bob Pastorello
    NSRCA 199  AMA 46373
    rcaerobob at cox.net
    www.rcaerobats.net

     

     

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

      From: Mike Hester 

      To: discussion at nsrca.org 

      Sent: Tuesday, December 28, 2004 8:38 PM

      Subject: Re: Why is it so quiet?

       

      YS SUCKS!!!!!!!!!!

       

      Better?

       

      =)

       

      -Mike

       

      P.S. I am actually going to try a DZ 160 some time this year. This could mean the apocalypse is near.

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

        From: William C. Harden 

        To: discussion at nsrca.org 

        Sent: Tuesday, December 28, 2004 9:33 PM

        Subject: Why is it so quiet?

         

        I know someone out there has something interesting to say.  So stir something up!

         

        Bill
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