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

[vicenterc at comcast.net]

Chris,

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

Vicente "Vince" Bortone

-------------- Original message -------------- 
From: "White, Chris" <chris at ssd.fsi.com> 

Hey Rick,
Can you tell me where to look at the details on a  BP starter?
 
Thanks!
Chris
 



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 
 



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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