---------------------------------------------------------- Lightning-List Digest Archive --- Total Messages Posted Mon 05/28/12: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:41 AM - Re: Landing gear shimmy (jeynon2) 2. 08:08 AM - Re: Re: Landing gear shimmy (Bernard Melendez, Jr.) ________________________________ Message 1 _____________________________________ Time: 07:41:22 AM PST US Subject: Lightning-List: Re: Landing gear shimmy From: "jeynon2" Has anyone considered torsion in the spar box as a possible culprit for the shimmy? The video shows both legs vibrating forward and back, and it is the spar box that links the two. This could also explain why stiffening the gear legs has little effect. You might check to see if the holes through the fiberglass for the bolts that attach the spar box to the fuselage have elongated indicating some slippage which would allow the spar box to flex. Perhaps just re-torquing the bolts would help. John Eynon Read this topic online here: http://forums.matronics.com/viewtopic.php?p=374087#374087 ________________________________ Message 2 _____________________________________ Time: 08:08:02 AM PST US From: "Bernard Melendez, Jr." Subject: Re: Lightning-List: Re: Landing gear shimmy Correct .... sorta kinda. It appears to me that the problem lays in the whe el(s) alignment and the fact that the main gear is splayed back. Consider t his: as the wheels come in contact with the runway, if they are not lined u p with the line of travel, they catch slightly on one side and then they sp ring back past the alignment point and catch on the other side (front or re ar of the wheel). There is a torque force on the entire length of the gear itself, which in turn causes the gear to flex fore and aft. That's my story , and I'm sticking to it (unless someone convinces me with a better explana tion) Bernardo Melendez kit #110 --- On Mon, 5/28/12, jeynon2 wrote: From: jeynon2 Subject: Lightning-List: Re: Landing gear shimmy Has anyone considered torsion in the spar box as a possible culprit for the shimmy?- The video shows both legs vibrating forward and back, and it is the spar box that links the two.- This could also explain why stiffening the gear legs has little effect.- You might check to see if the holes th rough the fiberglass for the bolts that attach the spar box to the fuselage have elongated indicating some slippage which would allow the spar box to flex.- Perhaps just re-torquing the bolts would help. John Eynon Read this topic online here: http://forums.matronics.com/viewtopic.php?p=374087#374087 le, List Admin. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message lightning-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Lightning-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/lightning-list Browse Digests http://www.matronics.com/digest/lightning-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.