From: RicArgente@cs.com
Message-ID: <5bdbba8e.247c1220@cs.com>
Date: Tue, 25 May 1999 10:48:00 EDT
Subject: Aileron Vibration
To: CHRISTOPHER_ZAVATSON@udlp.com, lancair.list@olsusa.com
Mime-Version: 1.0

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Chris,

Thanks for the response.  

<<If you see rotational movement about the hinge axis, that is a different 
animal-flutter.  If the entire aileron is moving up and down with no 
rotation-the mass balancing is doing its job. This vertical vibration with an 
unbalanced surface could easily lead to flutter as it would lead to rotation 
about the hinge and aerodynamic coupling.>>

How do I detect or see this 'rotational movement'?  All I see is the aileron 
vibrating up and down at a frequency that changes with airspeed and/or engine 
setting.   

Another observation: I can feel the vibration on the control stick and even 
if I held the stick really tight, I am unable to arrest the vibration.

Anyway,  until I fly N360ZR again, I'm still not sure if the vibration I am 
experiencing with the left aileron is aerodynamically induced or engine/prop 
vibration induced.  I hope to test my modifications this afternoon and will 
report on the results on this forum.  I guess if it doesn't work, I will go 
to the next step and balance the prop dynamically and install the new engine 
isolators I recently received from Lancair with the objective of reducing 
vibration coming from that area.  


Rick Argente
N360ZR
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LML homepage:   http://www.olsusa.com/Users/Mkaye/maillist.html