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John,
The yaw damper adds friction to the rudder system and that friction is very noticeable. It does reduce the tendency of the nose to change headings in flight but the need is low in the piston powered LIV's. The turbine needs some additional fin aft of the center of gravity to assist in power loss at high power low airspeed plus it is startling at high speed to see how much the nose yaws a an abrupt power loss or reduction. I have used Ventral fins to address this and that produces a significant improvement.
Tru Trak is a wonderful autopilot but all of the servos have too much friction with the servo unpowered. It makes it a little harder to feel the airplane.
Jack Webb
L360, LIV AeroSpace Engineer BSAE
FAA Designated Check airman for C421, C404 & C310
ATP, CFI Airplanes & Instruments, Multi, & Sea
Numerous Jet Type Ratings
Experienced Experimental Test Pilot both multi and single engine aircraft
Former Chief Engineering Test Pilot for a Major Manufacturer
From: John Barrett <2thman@cablespeed.com>
To: lml@lancaironline.net
Sent: Tuesday, October 21, 2008 1:07:27 AM
Subject: [LML] Yaw Damper in IVP
I'm interested to know about any experiences with Tru Trak and yaw damper in the IVP. Is there a need to add auto trim? I seem to recall reports that without the yaw damper the aircraft gets a little unstable longitudinally, but can the yaw damper solve the problem on its own? Regards, John Barrett, CEO Leading Edge Composites PO Box 428 Port Hadlock, WA 98339 www.carbinge.com -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html
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