Mailing List lml@lancaironline.net Message #31851
From: Lorn H. Olsen <lorn@dynacomm.ws>
Sender: <marv@lancaironline.net>
Subject: Re: airframe vibration
Date: Thu, 15 Sep 2005 11:30:52 -0400
To: <lml@lancaironline.net>
I get the grey streaks in the ailerons even though I am using the teflon hinges. My hinges are pretty loose. My mechanic and feel that they are OK for now but I inspect them in my preflight's.

My flaps and elevator use standard hinges. The flaps have never had streaks. The elevator has the streaks once in a while but is not loose.

Lorn

From: Sky2high@aol.com

Scott, I assume you meant to say "I have(n't had) this problem since using......" unless things have changed since your previous discussion of the topic.

Chris,

Problems? That depends on the meaning of "problems."  The oversized hinges are terrific in that there is no looseness of or extra resistance in the control surfaces or flaps. On the other hand, I am experiencing "wear" on the outboard elevator hinges (especially the left) as evidenced by aluminum streaking trailing behind those hinges after several hours of cruise flight.

Dirty air from the prop?  A harmonic from frame vibration?  And, for a really technical description, excitation from an overly wiggly tail?  I am just wondering if other small-tailed LNC2's have seen this situation

Scott Krueger AKA Grayhawk
LNC2 IO 320 SB 89/96
--
Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-345-0500, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, 1,100 hrs, N31161, Y47, SE Michigan

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