Curious OS 1.40 RX Problem

[Ron Van Putte]

John Fuqua has been running an OS 1.40 RX is a Focus with absolutely no 
problems for two years.  A month ago he finished a Panacea and 
installed a new OS 1.40 RX that he'd broken in and flown on his old 
Focus.  Everything was fine in the new Panacea until a week ago.  The 
engine ran fine on the ground, but at varying times airborne, the 
engine would quit rich at full throttle.  We tried a number of things 
until we leaned out the idle mixture.  The problem went away.  I can 
understand any number of reasons why an engine will go lean, but causes 
of going rich are on a short list.  Does anyone have a clue what caused 
this problem?

BTW, leaning out the idle mixture caused the engine to be at a higher 
RPM in the mid-throttle settings and John had to redo the transmitter 
throttle curve to get the throttle response the way he wanted it.

Ron Van Putte

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