[NSRCA-discussion] YS DZ pump settings

[Grow Pattern]

My money is on the exhaust valve being coked up and/or the ring sticking.

Eric.
  ----- Original Message ----- 
  From: John Ferrell 
  To: NSRCA Mailing List 
  Sent: Sunday, February 12, 2006 2:50 PM
  Subject: Re: [NSRCA-discussion] YS DZ pump settings


  Try this before getting too complicated:
  A loose prop will cause back fires. After the first backfire the machined groves are smoothed out on the prop hub. 
  Easy to find out. cut a couple of washers from coarse (80?) sand paper, CA them so the rough side is out and put the assembly between the prop hub and the Spinner. 

  John Ferrell    
  http://DixieNC.US

    ----- Original Message ----- 
    From: Ed Deaver 
    To: NSRCA Mailing List 
    Sent: Saturday, February 11, 2006 10:56 PM
    Subject: [NSRCA-discussion] YS DZ pump settings


    My buddy has a 140DZ and is having problems.  CoolPower 30% Heli fuel, 16.5x12.5W prop, flying at sea level.  

    We had been using Magnum DZ but his header kept getting plugged, so switched fuel.

    Now he is having problems with it backfiring.  He lost his spinner the other day, and another time it was held on only by a thread or so on the spinner bolt.

    He has tried richening up the pump(turning in) and has also tried running it blubbery rich(2.25 turns out)  

    On the ground, it starts easily, runs well he states, then soon as taking off, it begins to run ragged, and recently yeilding 10 of 10 dead sticks.

    Any suggestions??

    Thanx in advance

    ed




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