[NSRCA-discussion] OS120AX Run/Set-Up Problem

[Ron Lockhart]

http://bpassociates.homestead.com/bp.html

Ron Lockhart
  ----- Original Message ----- 
  From: White, Chris 
  To: NSRCA Mailing List 
  Sent: Tuesday, September 12, 2006 6:01 PM
  Subject: Re: [NSRCA-discussion] OS120AX Run/Set-Up Problem


  Hey Rick,

  Can you tell me where to look at the details on a  BP starter?

   

  Thanks!

  Chris

   


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  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Rick Wallace
  Sent: Tuesday, September 12, 2006 4:13 PM
  To: nsrca-discussion at lists.nsrca.org
  Subject: Re: [NSRCA-discussion] OS120AX Run/Set-Up Problem

   

  Bill - 

  First the starter issue - a BP starter will start this engine and most any other up to and including a 23cc gasser. 

  Second - is there any reason you've decided you need a pump on your AX? I recently completed my GiantScalePlanes Swallow 90 with the 120AX -- (with the head at about 8:00) which is about the same size and config as a Quest and it doesn't need a pump. Tank is on the firewall; engine tunes fine and draws fuel fine with stock carb and muffler pressure. 

  This setup gives me all the vertical I could want (duh... a 120 on an 8-1.2 lb plane-  yah...) with no indication at all that there's a fuel feed condition. 

  Might be easier to go back to stock setup and just fly? 

  my $.02...hope to see you this weekend! 

  Rick 

   


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    From:  Bill Markovitz <wdmarko at yahoo.com>
    Reply-To:  NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
    To:  nsrca-discussion at lists.nsrca.org
    Subject:  [NSRCA-discussion] OS120AX Run/Set-Up Problem
    Date:  Tue, 12 Sep 2006 11:35:44 -0700 (PDT)
    >HI....I have a new OS120AX that I put in a Quest
    >airplane.  The engine is mounted inverted.  The fuel
    >tank is at the airplane CG and I'm using a VP-30 Perry
    >regulataing punp.  I have the low end needle valve (OS
    >calls it the mixture control valve) at it's maximun
    >lean position, but it isn't lean enough.  I had the
    >same problem with an OS50SX and fixed the problem by
    >modifying the low end needle valve so that it could be
    >adjusted beyound the designed maximum lean position.
    >The 120 is a different design and cannot be fixed the
    >same way.  The basic problem is that the Perry pump is
    >putting out too much pressure at the minimum presssure
    >setting and this results in too much fuel being
    >delivered at idle.  If the taper on the main needle
    >valve was changed to allow it to engage deeper into
    >the mixture control valve at the idle setting, this
    >would fix the problem, however, I'm not sure I could
    >accurately and precisely change the taper.  Any
    >suggestions?
    >
    >  Also, my starter doesn't have enough torque to turn
    >over the 120, so I have been starting it by hand.  The
    >problem here is that I cannot start it with the engine
    >inverted.  The fuel just drips out of the carburator
    >(onto the ground) and is not sucked into the engine.
    >When I turn the airplane up side down it consistently
    >starts with the first flip.  Obviously I need a higher
    >torque starter so that a higher turning rate (RPM)
    >will develop the sucking powrer to pull the fuel into
    >the engine.  Any suggestions on a starter that will do
    >the job?
    >
    >Thanks in advance for your help.
    >
    >...................Bill    :(
    >
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