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11-23-2012, 08:38 PM
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Join Date: Apr 2009
Location: USA
Posts: 1,499
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I run tire pressure 10 psi higher than Van's recommended pressures. If mine sits more than two weeks the tires get flat spots and cause shimmy during taxi, especially solo. If taxiing with morning sun shining across nose pant, I notice a fore-aft shimmy around 15 kts. I fly at gross and near aft limit 95% of the time and rarely have any shimmy. My original tires are 1/4-5/16" out of round, so I did not bother balancing.
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Good judgment comes from experience, and a lot of that comes from bad judgment.
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11-23-2012, 10:59 PM
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Join Date: Oct 2005
Posts: 1,516
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Egg Shaped
If your RV sits longer than about a week your tires will be egg shaped no matter how round or balanced they were at one time.
Unless you suspend your aircraft in your hangar, there is simply no point in balancing your tires or shaving them to be round.
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Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 600 plus hours
Running on E10 mogas
Don't believe everything you know.
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11-24-2012, 07:43 AM
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Join Date: Apr 2009
Location: USA
Posts: 1,499
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I forgot to mention after taxi and takeoff, they are always fine on landing. It does not take long for them to return to shape.
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Good judgment comes from experience, and a lot of that comes from bad judgment.
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11-24-2012, 07:57 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Quote:
Originally Posted by Captain_John
Just CURED THAT PROBLEM in the six this past weekend!
Billy suggested lowering tire pressure. We brought the tires down to about 26 lbs and it was like MAGIC! ALL the shimmy was gone!
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You may consider carrying a spare tube, the biggest cause of flats on tube type tires, in my experience, is from under inflation. Even though 26 psi isn't grossly low you are inviting trouble.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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11-24-2012, 08:08 AM
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Join Date: Jan 2012
Location: Oconomowoc, WI
Posts: 460
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For those of you who have tried the balancing methods and lower tire pressures with no success, we do sell gear leg stiffeners which fiberglass to the rear of the gear legs inside the fairings. They are made of wood, cut and tapered to fit on the back of the gear legs.
We don't manufacture these in house. Another RV builder makes them for us, and we resell them for him.
Take a look at our website in the RV section, and you will find the gear leg stiffeners .
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11-24-2012, 10:42 AM
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Join Date: Jan 2005
Location: KPYM
Posts: 2,686
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Quote:
Originally Posted by Walt
You may consider carrying a spare tube, the biggest cause of flats on tube type tires, in my experience, is from under inflation. Even though 26 psi isn't grossly low you are inviting trouble.
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Walt, thanks and yes we do carry a spare tube just as a matter of course.
Besides... With the greaser landings that I do it just isn't an issue! Hahaha
 . CJ
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RV-7 Flying - 1,200 Hours in 5 Years!
The experiment works!
TMX-IO-360, G3i ignition & G3X with VP-X
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11-24-2012, 02:42 PM
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Join Date: Jan 2006
Location: New Smyrna Beach, FL
Posts: 1,339
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Quote:
Originally Posted by Aircraft Specialty
For those of you who have tried the balancing methods and lower tire pressures with no success, we do sell gear leg stiffeners which fiberglass to the rear of the gear legs inside the fairings. They are made of wood, cut and tapered to fit on the back of the gear legs.
We don't manufacture these in house. Another RV builder makes them for us, and we resell them for him.
Take a look at our website in the RV section, and you will find the gear leg stiffeners .
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Are these stiffeners sized correctly for the RV-10 main gear?
__________________
David Maib
RV-10 N380DM
New Smyrna Beach, FL
VAF Paid 1/21/2020
"In '69 I was 21, and I called the road my own"
Jackson Browne
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11-25-2012, 04:45 PM
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Join Date: Jan 2012
Location: Oconomowoc, WI
Posts: 460
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Quote:
Originally Posted by dmaib
Are these stiffeners sized correctly for the RV-10 main gear?
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David....
They are notched in the back in a triangular shape. So, they will fit over any round gear leg.
We don't manufacture these in house. They come from another RV builder who has been making these for RV aircraft for years.
Feel free to contact us at steve@aircraftspecialty.com if you would like me to take any specific dimensions for you.
Steve
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11-26-2012, 09:16 AM
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Join Date: Nov 2008
Location: Missoula, MT
Posts: 714
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No shimmy here
I guess I don't have the shimmy -- I sure haven't noticed it. Stock tires, planearound brackets on the wheel, I did balance the wheels/tires, 230 hours on the plane. I did get a nose wheel shimmy early on but it is way down after I retorqued the nose wheel nut to take up the looseness that had developed. I'll have to pay more attention in that speed range for the main gear shimmy, but I sure haven't noticed anything objectionable. As for flat spots, my plane hasn't sat for more than 1 week  so I can't speak to that.
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Bryan Douglass
=VAF= 2020 dues paid
RV-10 N242BD
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11-27-2012, 09:19 AM
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Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,458
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Quote:
Originally Posted by pierre smith
Years ago, before radials tires, we had our tires "shaved" until they were perfectly round and they rode very well.
Seems that it would be easy to mount the tires in a balancer and use a grinder of some sort, to true the tires, no?
Best,
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....We offer this service, Truing, Balancing, Rotor Truing and ball bearing conversions for all wheels (mains and nose) on all models. Check out the videos on this at our web site. Thanks, Allan... 
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Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & ServicesInfo@AntiSplatAero.com Southern California (KREI)
RV-9A / Edge-540 
(909) 824-1020
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