<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'><P>29% castor - sounds like CL stunt fuel. Does it get tail heavy during flight? <G></P>
<P>I'd suspect some of problem will go away when you switch to more typical pattern fuel mixtures.</P>
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<P>Couldn't hurt to move tank down to on carb centerline.</P>
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<P>Ive had excellent results for years with DuBro sintered brass fuel line clunk. Maybe YS foam clunk would be as good?</P>
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<P>Ron Lockhart</P>
<P><BR>----- Original Message -----<BR>From: "J Shu" <jshulman@cfl.rr.com><BR>To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><BR>Sent: Sunday, September 20, 2009 4:43:02 PM GMT -05:00 US/Canada Eastern<BR>Subject: [NSRCA-discussion] OS-120AX questions/thoughts... yes again<BR><BR>Hi All,<BR><BR>I've posted in RCU about some issues I'm having with my OS-120AX and was wondering what you might think?<BR><BR>Here's the the link: http://www.rcuniverse.com/forum/m_9110170/tm.htm<BR><BR>And what it says:<BR><BR>I'm hoping this thread will help answer some questions about the OS-120AX that I am having.<BR><BR>I've got it in an 8lb 2oz, 110 sized pattern plane, stock muffler, 420cc tank (14oz), OS-F plug, 3-line system (Vent, carb clunk <BR>line, fill clunk line), 15x10 APC and for break-in, PowerMaster 10% with 29% Caster... will switch to 15% with 16-18% Synthetic <BR>after this gallon.<BR><BR>The tank is fairly close to inline with the carb, maybe 1/2" higher. On neg/inverted pushes the motor seems to starve until I close <BR>the throttle a little. On pos/upright pulls it seems ok, maybe a slight richening. There is a nice smoke trail as after my first <BR>flight I wasn't rich enough and the flight ended a bit early. I'm sure it will run a bit easier after it's broken in, but has anyone <BR>tried a foam clunk like the YS's use?<BR><BR>Any other tips? It has enough power with this set-up to go through the F-09 sequence, but about half way through it starts this <BR>'cutting out' deal. It's just annoying to have to power back as you're climbing to keep it running.<BR><BR>Also, what differences has anyone noticed flying the 15x10 to 16x8 in testing.<BR><BR>Regards,<BR>Jason<BR>www.shulmanaviation.com<BR>www.composite-arf.com<BR><BR>_______________________________________________<BR>NSRCA-discussion mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR></P></div></body></html>