I have a fairly new (less than a year old) OS .61FX mounted upright in a
Twist 3D 60 with a 13x6 prop. The engine has been properly broke in and
has about 20 flights on it.
I'm having a problem that I'm not sure how to solve.
When flying the plane at around 1/4 throttle, if I fly inverted, it
will die and I have to dead-stick the plane to the ground.
It doesn't seem to happen when I do this at 3/4 or higher throttle, but
it does stutter from time to time, it just doesn't quit.
I never have a problem whatsoever if I don't fly inverted ... runs
through a tank of fuel just fine and I can do anything I want with the
plane.
At first, I thought the clunk was getting stuck and sucking air, but
this is not the case.
The clunk is free and not getting hung up anywhere ... also, when the
plane lands dead-stick, upon inspection, there is fuel in the fuel line
all the way to the carb with no air bubbles in it.
Is there a way to correct this problem? Anyone ever had this happen
before? I'm not sure where to start, I've never had this issue
previously.
I've tried leaning and richening the engine with the main needle valve
(no difference - the problem is repeatable), and I've changed to a
hotter glow plug (from an OS 8 to a 3) so far.
I'm just not sure what's causing the condition, so I'm not sure what to
try to fix it.
Could the engine be flooding itself upside down somehow, causing the
glow plug to foul out? What would cause that and how can it be
corrected?
I pulled the glow plug after one of the dead-stick landings and it was
not wet, but with a hot engine, I thought maybe it had eva****ated after
normal level flight had resumed (even though the engine was not
running).
Just not sure where to go with this and I'm searching for some ideas to
try ....
--
Stormlord
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