Scott,
I’m new to the LML site but I have
built several aircraft over the years.
One thing that scares me on the Lancair is
flutter. I recently found a IV elevator trim that could easily be moved up and down as
much as 1” at the trailing edge.
It turned out to the hinge that the tab was attached to was bending. The
owner had not had a problem with flutter but the hinge was completely worn out
due to vibration in only a couple hundred hours. Lowering the attach point on the horn
reduces the leverage and increases the movement of the tab. This will make it too sensitive and
lessen the arm needed to prevent flutter.
I don’t recommend it.
Lanny
-----Original Message-----
From: Lancair Mailing List
[mailto:lml@lancaironline.net] On Behalf Of Scott
Seagrave
Sent: Thursday, May 31, 2007 7:09
PM
To: lml@lancaironline.net
Subject: [LML] IV-P Rudder Trim
I'm in the process of closing my rudder and building
the trim tab. I am thinking about mounting the pushrod lower on the
attach bracket and cutting the top of the bracket off, allowing the entire
mechanism to live internally. I know the external arm doesn't create
enough drag to worry about, but I am just not crazy about the way it
works.
I'm curious as to who else has attempted this and what
information they can pass along.
Lancair IV-P (still too early for percentages!)
N721MS (reserved)
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