Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml
Date: Mon, 30 Sep 2002 21:05:02 -0400
Message-ID: <redirect-1794765@logan.com>
From: "Ted Noel" <tednoel@cfl.rr.com>
Subject: L-IV-P elevator sensitivity
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Having flown the factory demonstrator, it is my feeling that the L-IV-P is
more sensitive in pitch than would be desirable for good control harmony.
Certainly those with more flight experience (Brent Regan, are you
listening?) can comment on this issue. It would appear to be desirable to
reduce the pitch sensitivity of the aircraft. Several solutions appear to be
possible.

1) Anti-servo Tab. This would obviously work, but provides another
mechanical item build and to fail.

2) Adjust the attachment point of the elevator pushrod to the weldment. This
would be incredibly simple, basically requiring a single hole (thru 2
plates) to be drilled. Rumor has it that this was the final fix to the 320
pitch sensitivity after the big tail mod. The problem would be whether it
would work, and how far to move the hole. The current arm is 2 3/4" from the
pivot to the pushrod hole (on centers). Would a 3/4" move (a 28% move) be
appropriate?

3) Increase the horizontal tail volume by adding about 3" to the chord of
the stab. (It starts about 13-14"). This would be an increase of just under
25% in volume. This is some work, but is mechanically simple, with no moving
parts. Note that this would be across the entire span, not a strake (like an
F-16 leading edge extension) that energizes the air to increase elevator
sensitivity.

Can any of you aerodynamic geniuses comment?

Ted Noel

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