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Old 01-11-2017, 10:20 PM
Bernie RV7 Bernie RV7 is offline
Join Date: Mar 2007
Location: Melbourne, Australia
Posts: 35
Default Bent legs and Tire wear

I have seriously bad inside tire wear on both sides of my recently purchased RV6..
Lots of toe out... also suspect bent legs as the left wing tip is about 3'' lower than the right. There is no firewall or fuselage distortion or damage to the engine mount.
Is there any way of knowing if the legs were factory drilled or drilled by the builder?....
What are my options of rectification .... thanks Bernie
Bernie Flying RV6
Building RV7
Melbourne Australia
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Old 01-11-2017, 10:36 PM
Jesse's Avatar
Jesse Jesse is offline
Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 2,644

I just recently sent a set of gear legs to Lang to straighten. They turned out to be the old weaker gear legs, so Lang got a new set from Van's and drilled them to match the weld Kent. Then we had to replace the U-403-PC brake brackets to fit the factory hole where the wheel attaches. Haven't found out how the tow-in/-out changed, but this plane also had very high wear on the inside of at least one side's tire. This was a tricycle gear plane, but the process should be similar for a conventional gear model.

I see you are in Australia. I don't know if there is a place like Lang there to do this type of thing. I'm sure they would do the job if you sent them to the US, though.
Jesse Saint (Saint Aviation, Inc. - VAF Advertiser)
RV Hotel (hangar, room, car) at X35 in north FL

Commercial ASEL/S A&P/IA EAA Technical Counselor

Dynamic Prop Balancing, Prebuy Inspections, Condition Inspections, Repairs and Mods, Injector Tuning, Airframe, Engine, Panel Upgrades, Ferrying, etc.
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Old 01-11-2017, 10:47 PM
rv7charlie rv7charlie is offline
Join Date: May 2006
Location: Pocahontas MS
Posts: 1,616

If the bend isn't too bad, it can be straightened cold in a 20 ton press. Span the bent area across two soft wood 'spacers' & press down on the bend (oriented up, obviously). Helps to have a helper, and take small 'bites', checking each time until straight.

YMMV, you didn't hear it here, etc etc.

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Old 01-11-2017, 11:12 PM
RVDan RVDan is offline
Join Date: Jun 2012
Location: Frederick, MD
Posts: 491

I might suggest rising the aircraft with both gear off the ground, then using the builder manual, check the toe in/out and gear leg straightness. You can also verify which gear leg has the problem. If this is an early -6, the gear legs were match drilled to the engine mount by the builder and they could have gotten it wrong. Another possibility is that a gear leg was replaced incorrectly.
Dan Morris
Frederick, MD
RV6 built and sold
N199EC RV6A flying
"Just because you have silenced your opponent, doesn't mean you have won the debate."
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Old 01-12-2017, 11:26 AM
Billythekid Billythekid is offline
Join Date: Jan 2016
Location: South California
Posts: 160
Default string it

once you string the landing gear relative to the fuse CL you should be able to tell which leg is off line and be how much. to do that imho is the first place to start as its the least expensive. and of course read how it should be done in the construction manual as that too is inexpensive.
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Old 01-12-2017, 02:02 PM
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JonJay JonJay is offline
Join Date: Jan 2007
Location: Battleground
Posts: 3,295

You might find some clues in the logs. A bent gear leg can often result in a prop strike. It takes quite a hit to bend the gear. Very hard landing or ground loop. If you see a rebuild, new prop, wing tip work, etc... you might link those to when the gear leg got bent. Not sure that changes anything as you still need to get it fixed regardless. However, if you don't find anything in the logs, something is amiss and I would investigating further.
Smart People do Stupid things all the time. I know, I've seen me do'em.

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Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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Old 01-12-2017, 06:01 PM
rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 6,201

With the sweep back angle of the round gear legs on RV's, if they get bent it also results in the toe alignment changing. If you know for sure you have at least one bent leg, it is fully possible that the inside tire wear is entirely caused by the likely toe misalignment that is the result of the bent legs.
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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