Today's Message Index:
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1. 07:41 AM - Re: Landing gear shimmy (jeynon2)
2. 08:08 AM - Re: Re: Landing gear shimmy (Bernard Melendez, Jr.)
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| Subject: | 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 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
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| Subject: | 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 <jeynon2@frontier.com> wrote:
From: jeynon2 <jeynon2@frontier.com>
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.
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