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<< Lancair Builders' Mail List >>
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In a message dated 12/18/2001 10:09:05 PM Mountain Standard Time,
lancair.list@olsusa.com writes:
<< The aircraft is draggig excessivly to the left, in flight as well as
taxying
with the engine running. No dragging is experienced without engine power. >>
Per -
Is this a new problem with an airplane that has been flying for some time, or
are these your findings from initial flights of a new airplane?
I infer that you're telling us that the left yaw/roll tendency only occurs at
high power settings, but not at idle. In other words, you pull the power off
and before the airplane has a chance to slow down, the left turning tendency
immediately disappears. If so, the problem is probably not being out-of-rig.
(Although "Grayhawk" has given you a lot of good things to check in this
regard.)
If the inference is wrong, and the left turning tendency remains irrespective
of power setting, then all of the out-of-rig and airframe misalignment issues
that Scott refers to should be checked.
If it is purely power-related, find someone who has flown in a similar model
and let them fly yours (or vice versa) and compare the
turning-tendencies-with-power to that other airplane. The
big-engine-little-airplane combination can result in more torque/P-factor-etc
than we're used to, I imagine. Although it really sounds like there's
something off here, rather than simply more power effects than you're used to.
Finally, if it does turn out to be a power-only issue, perhaps the engine
mount could be shimmed to correct a built in misalignment. Was this a
fast-build kit with the firewall attached at the factory, or a slow-build kit
whose firewall might have been installed at a slight angle? (I don't know
how the firewalls are connected in the slow build kits, so pardon me in the
question seems weird.) The bottom line is that another thing to check is the
perpendicularity of the prop disc to the aircraft centerline -- although I'm
not sure how you would check this...
- Rob Wolf
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