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Lightning gear leg shimmy

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LIGHTNING AUSTRALIA

Joined: 02 Dec 2008
Posts: 11
Location: Kingston SE AUSTRALIA

Posted: Tue Dec 02, 2008 1:15 am Post subject: Lightning gear leg shimmy

To those experiencing landing gear shimmy -  here in Australia I have experimented with our first demonstrator aircraft and through trial and error have found that by taking the wheel alignment to a tow out setting instead of the suggested tow in setting, the problem is eliminated.  I have used the same tow out as was suggested for the tow in.  Over a 12 month period we have monitored the tyres and there is no evidence of any excess  wear. Due to the success of this trial, we have used the same settings on several other aircraft that are flying with the same positive result. These results we obtained regardless of weight loading of the said aircraft.

Dennis Borchardt

Lightning Aircraft Australia

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Dick

Joined: 02 Feb 2008
Posts: 12

Posted: Tue Dec 02, 2008 10:28 am Post subject: Lightning gear leg shimmy

The gear legs in my lightning were set to 1deg toe out in June of this

year.  The speed at which shimmy occurs changed from about 40mph to about

20mph.  I have balanced the wheels with not much change.  I am now making

the wooden stiffeners used by the RV folks and hope to have them installed

in a couple of weeks.  An old hand RV builder told me last week that they

set the gear legs straight, ie no toein or toeout and have seen no wander or

other problems.  I plan to try that if the gear leg stiffiners have'ent

solved the problem.

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selwyn

Joined: 12 Mar 2008
Posts: 102
Location: Australia

Posted: Tue Dec 02, 2008 2:28 pm Post subject: Re: Lightning gear leg shimmy

Has anyone measured the effect of loading on fore and aft wheel alignment?  What I am thinking of is measuring the more or less empty aircraft, filling it with fuel, adding two large lads, rolling it along in a straight line for a bit to let things settle and then measuring it again.



This would be useful information to put into thinking about effects of alignment, especially as we have this difference in observed effects.

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_________________
Cheers, Selwyn
Kit 66 VH-ELZ

staufferm

Joined: 16 Dec 2007
Posts: 34

Posted: Tue Dec 02, 2008 3:37 pm Post subject: Lightning gear leg shimmy

Selwyn,



Here in Shelbyville we load up the plane to around 1250 lbs using sand bags

on the wings and then roll it fore and aft a few times (2'-3'). At that

point we set the toe on the gear. Currently we're setting the toe to 1

degree out.



We've never measured the difference in toe between empty and loaded.



Mark



--

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