Today's Message Index:
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1. 06:47 AM - Re: Re: Landing gear shimmy (Rick Discher)
2. 06:46 PM - Re: Re: Landing gear shimmy (Craig Sumner)
Message 1
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| Subject: | Re: Landing gear shimmy |
I had the gear leg shimmy on my Lightning 830LW. I took pieces of maple2" x
3" and shaped them to fit the gear leg . I routed out the front edge to fit
the gear leg then made the piece of wood the same width as the gear leg and
then tapered the trailing edge. I bonded the wood on to the gear leg with
Plexus MA310. It is a methacrylate adhesive. I then laminated over the gear
leg and the wood with 3 layers of 12 oz. carbon fiber and vinylester resin.
The results are so far so good.
Rick Discher
-----Original Message-----
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com] On Behalf Of Nick
Otterback
Sent: Tuesday, May 08, 2012 7:29 PM
Subject: Re: Lightning-List: Re: Landing gear shimmy
--> <vettin74@yahoo.com>
What about a different materal for the leg all together?
We dont have the problem on the lsa gear that often if at all. But the
overlay angle or sweep of the gear is not as pronounced.
Have thought about the use of titanium gear legs. That material is said to
be "dead" material due to make up. It does flex but does not spring back
with as much pep. Sonex uses this for their main legs, it is a bit more
expensive but may be a solution. Let me look into it.
Nick
Sent from my pocket
On May 8, 2012, at 7:06 PM, "Tex Mantell" <wb2ssj@rochester.rr.com> wrote:
> --> <wb2ssj@rochester.rr.com>
>
> Bill, great video, thank you for your effort. Tex
>
>
>
>
>
>
>
> ----- Original Message ----- From: "Bill Strahan" <bill@gdsx.com>
> To: <lightning-list@matronics.com>
> Sent: Tuesday, May 08, 2012 5:36 PM
> Subject: Lightning-List: Re: Landing gear shimmy
>
>
>>
>> Okay, no egg on my face I suppose. Finally got a video camera to check
things out. It's clearly the main gear.
>>
>> It should be on youtube here: http://youtu.be/rzb_eeyhLJU in a few
minutes.
>>
>> This clip makes it pretty visible starting at 0:28 on the landing roll.
I don't use the brakes much to try to discount that influence, and I let the
nose drop the moment I land so I can see if it's the nose or mains.
>>
>> On taxiing back, I decided to accelerate and test it again, and the
second shimmy can be seen at 1:28.
>>
>> It may not look like much on a video camera, but that's a serious bit of
wiggling in the cockpit.
>>
>> I'm astounded that the stiffeners don't make an impact on it. I can't
flex them by hand at all in that direction.
>>
>> This is a big deal for me because I fly into some pretty busy places and
it occurs right at the speed I'd be doing on a long runway to hurry up and
make a turnoff. That, and I don't like passengers looking a little freaked
out and asking what the heck that was. And it can't be good for the whole
plane to violently shake like that.
>>
>> For the record, I've balanced tires, changed to 6 ply tires, balanced
those, and now the fiberglass stiffeners. No relief yet. Not sure what
comes next.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=372654#372654
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
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>
>
Message 2
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| Subject: | Re: Landing gear shimmy |
Outstanding video Bill! Thanks for taking the time to mount a camera for
all to see. I will share this with others and see what our NASA/DoD
engineers think could be the right fix. I know the folks in Shelbyville
(who are outstanding folks) would like to see this issue resolved.
Best Regards,
Craig Sumner
N155JM
Esqual 074
-----Original Message-----
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com] On Behalf Of Bill Strahan
Sent: Tuesday, May 08, 2012 4:37 PM
Subject: Lightning-List: Re: Landing gear shimmy
Okay, no egg on my face I suppose. Finally got a video camera to check
things out. It's clearly the main gear.
It should be on youtube here: http://youtu.be/rzb_eeyhLJU in a few
minutes.
This clip makes it pretty visible starting at 0:28 on the landing roll. I
don't use the brakes much to try to discount that influence, and I let the
nose drop the moment I land so I can see if it's the nose or mains.
On taxiing back, I decided to accelerate and test it again, and the second
shimmy can be seen at 1:28.
It may not look like much on a video camera, but that's a serious bit of
wiggling in the cockpit.
I'm astounded that the stiffeners don't make an impact on it. I can't flex
them by hand at all in that direction.
This is a big deal for me because I fly into some pretty busy places and it
occurs right at the speed I'd be doing on a long runway to hurry up and make
a turnoff. That, and I don't like passengers looking a little freaked out
and asking what the heck that was. And it can't be good for the whole plane
to violently shake like that.
For the record, I've balanced tires, changed to 6 ply tires, balanced those,
and now the fiberglass stiffeners. No relief yet. Not sure what comes
next.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=372654#372654
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