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

[White, Chris]

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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