---------------------------------------------------------- Zenith601-List Digest Archive --- Total Messages Posted Sun 06/03/12: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:40 AM - Re: Flight test report - N773PM (Sabrina) 2. 12:05 PM - Re: Re: Flight test report - N773PM (Paul Mulwitz) 3. 02:55 PM - Re: Flight test report - N773PM (hallert) 4. 03:21 PM - Re: Re: Flight test report - N773PM (Paul Mulwitz) 5. 08:53 PM - Prop Extension for sale (GLJSOJ1) ________________________________ Message 1 _____________________________________ Time: 11:40:52 AM PST US Subject: Zenith601-List: Re: Flight test report - N773PM From: "Sabrina" Dear Paul, If I were to hazard a guess, your Yaw stability issue is likely due to improperly tensioned rudder cables, slightly misaligned nose gear bearings and aft CG loading. Nothing a little adjustment, lubrication and full fuel load won't cure. Dear Ron, Congrats! Sabrina P.S. CERN has welcomed me with open arms, not to mention my best birthday party in a decade. I have accomplished a lot in just one week. My sophomore year at MIT finished strong: http://sabrinaaerospace.com/index.php?news&nid=42 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=374612#374612 Attachments: http://forums.matronics.com//files/istanbul_416.jpg ________________________________ Message 2 _____________________________________ Time: 12:05:52 PM PST US From: Paul Mulwitz Subject: Re: Zenith601-List: Re: Flight test report - N773PM Hi Sabrina, Thanks for the advice. Unfortunately, I've already tried all of that stuff. I did need to extend the nose gear column by 1/8 inch but that had little impact on the yaw stability. I noticed the column on another XL at my home field had about 4 inches extending above the firewall shelf while mine didn't get above it at all. After taking a close look at the whole airplane I came to the conclusion that this design has no inherent yaw stability. View of the fuselage from the top presents a diamond shape that has no vertical surface that runs parallel to straight flight. The closest it gets is a 22 degree included angle presented by the tail end of the fuselage. The full flying rudder depends on the V-blocks in the nose gear column assembly to make it straight when there is no rudder pressure applied in flight. (I don't have wheel pants that might give a little stability.) I did learn on early flights that the V-blocks made my plane pull a little to the left in flight. I fixed that by adjusting the rudder cables so the rudder is straight. I have always had my rudder cables tensioned according to CH's requirements. This whole line of thought started when another list member pointed out that forward slips do not do anything to cause the plane to have a steeper approach path. I then learned from my own plane that if I kicked the nose to one side or the other it didn't return to center as required by F2245. At least in the case of my plane it clearly doesn't meet the LSA spec for stability. I wonder what other owners find when trying this test. Best regards, Paul On 6/3/2012 11:40 AM, Sabrina wrote: > --> Zenith601-List message posted by: "Sabrina" > > Dear Paul, > > If I were to hazard a guess, your Yaw stability issue is likely due to improperly tensioned rudder cables, slightly misaligned nose gear bearings and aft CG loading. Nothing a little adjustment, lubrication and full fuel load won't cure. > > Dear Ron, > > Congrats! > > Sabrina > > P.S. CERN has welcomed me with open arms, not to mention my best birthday party in a decade. I have accomplished a lot in just one week. My sophomore year at MIT finished strong: http://sabrinaaerospace.com/index.php?news&nid=42 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=374612#374612 > > > Attachments: > > http://forums.matronics.com//files/istanbul_416.jpg > > ________________________________ Message 3 _____________________________________ Time: 02:55:20 PM PST US Subject: Zenith601-List: Re: Flight test report - N773PM From: "hallert" Paul, On the yaw issue my plane is different in one regard from anything I have flown before - it has a stiff nose gear bearing that tends to stay where I push it with noticeable friction. At first I fund this somewhat annoying but now I consider it an advantage as sort of a "poor man's rudder trim". On climb out I push enough right rudder to center the ball and can then remove pedal pressure while remaining rudder trimmed. After climb out a little nudge on the left pedal corrects rudder trim for cruise. Ted Read this topic online here: http://forums.matronics.com/viewtopic.php?p=374624#374624 ________________________________ Message 4 _____________________________________ Time: 03:21:01 PM PST US From: Paul Mulwitz Subject: Re: Zenith601-List: Re: Flight test report - N773PM Hi Ted, That sounds like mine too. You are calling that stiff rudder, I am calling it lack of yaw stability. Both are true. Paul On 6/3/2012 2:53 PM, hallert wrote: > --> Zenith601-List message posted by: "hallert" > > Paul, > On the yaw issue my plane is different in one regard from anything I have flown before - it has a stiff nose gear bearing that tends to stay where I push it with noticeable friction. At first I fund this somewhat annoying but now I consider it an advantage as sort of a "poor man's rudder trim". On climb out I push enough right rudder to center the ball and can then remove pedal pressure while remaining rudder trimmed. After climb out a little nudge on the left pedal corrects rudder trim for cruise. > > Ted > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=374624#374624 > > ________________________________ Message 5 _____________________________________ Time: 08:53:40 PM PST US Subject: Zenith601-List: Prop Extension for sale From: "GLJSOJ1" I am changing out the nose of my XL and am selling my prop extension. Follow the link to Barnstormers. Thanks. http://www.barnstormefrs.com/cat.php?mode=search -------- 601XL N676L FLYING PHASE I CHESAPEAKE VA Read this topic online here: http://forums.matronics.com/viewtopic.php?p=374640#374640 Attachments: http://forums.matronics.com//files/2012_03_17_074525_174.jpg ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message zenith601-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Zenith601-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/zenith601-list Browse Digests http://www.matronics.com/digest/zenith601-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.