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  #1  
Old 10-15-2019, 10:01 AM
JackinMichigan's Avatar
JackinMichigan JackinMichigan is offline
 
Join Date: Nov 2012
Location: Canton, MI
Posts: 221
Default Rapid tire wear

I have 51 hours in my RV-10 with maybe 80 landings, and last weekend I removed the wheel pants in preparation for the condition inspection. I noticed the outside edges of both main wheels were heavily worn, to the point where the most outside tread was just barely visible. The rest of the tire seemed OK, and the nose wheel still looks brand new.

I have had a couple of less-than-impressive landings, but overall I don't feel as though I've been beating up my landing gear too badly. The plane tracks well on the ground, so unless my landings aren't as smooth as I thought I can't understand why these tires are so worn. I'm using the tires sold by Van's.
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Jack and Dave Groat, father and son
RV-10 N1861G
Build #41389, started Oct 2012
Current status: 1st Flight 11/10/17
50 hour oil change: 8/29/19
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  #2  
Old 10-15-2019, 10:09 AM
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koupster koupster is online now
 
Join Date: Dec 2013
Location: SLC, UT (KBTF)
Posts: 193
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What air pressure was in the tires when you removed the wheel pants?

Cheers, David
RV-6A - KBTF
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  #3  
Old 10-15-2019, 10:56 AM
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JackinMichigan JackinMichigan is offline
 
Join Date: Nov 2012
Location: Canton, MI
Posts: 221
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Quote:
Originally Posted by koupster View Post
What air pressure was in the tires when you removed the wheel pants?
They had crept down to 25-30. I try to keep them at 40.
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Jack and Dave Groat, father and son
RV-10 N1861G
Build #41389, started Oct 2012
Current status: 1st Flight 11/10/17
50 hour oil change: 8/29/19
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  #4  
Old 10-15-2019, 11:04 AM
rdrcrmatt rdrcrmatt is offline
 
Join Date: Oct 2014
Location: Milwaukee, WI
Posts: 251
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It's often said a new RV owner will burn a set of tires and brakes their first year.
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CFI / RV-10
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  #5  
Old 10-15-2019, 12:15 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 5,986
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Because the wheels hang down in flight, you always touch down on the outer edge of the tire. Demount the tires, swap left and right, double their life.
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  #6  
Old 10-15-2019, 12:28 PM
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koupster koupster is online now
 
Join Date: Dec 2013
Location: SLC, UT (KBTF)
Posts: 193
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This from the MICHELIN® aircraft tire manual https://www.faasafety.gov/files/gsla...nteractive.pdf :

8.4. Underinflation Wear (shoulder wear)
8.4.1. Description: The shoulders of the tire appear to be abnormally worn when compared to the wear in the center of the tread.
8.4.2. Cause: A tire operated with consistently with low pressure will develop excessive shoulder wear. Frequent high speed turning will also cause excessive shoulder wear. Refer to Figure 507.
NOTE: Any measurement below 95% of nominal inflation pressure requires maintenance action. Refer to Figure 503. Underinflation increases the deflection of the tire which may result in overheating, abnormal tire wear, shortened tire life, and possible tire failure.

Tread wear image here https://www.google.com/imgres?imgurl...act=mrc&uact=8

I'm unable to assess the inflation state of my RV-6A tires when viewing from the front. However, when viewed from the side, the fore and aft footprint can be seen to grow as inflation pressure decreases. I note how long the footprint is when properly inflated, and look for that on preflight. A pressure check would be more accurate, but is a bit more work with wheelpants installed.

Flipping the tires to compensate for asymmetrical wear on the outside edge of each main tire due to wheel camber at touchdown is an accepted practice.

Cheers, David
RV-6A - A&P

Last edited by koupster : 10-15-2019 at 12:37 PM. Reason: Addition
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  #7  
Old 10-15-2019, 12:33 PM
Electrogunner Electrogunner is offline
 
Join Date: Aug 2016
Location: Quarryville ,pa
Posts: 467
Default Data point

I have the desser retreads on mine. I've accumulated almost 90 hr's and about 130 landings since 1st flight in February and the tires and matco brakes are holding up very well. Hardly any tire wear and about 1/2 brake pads left. The free castering nose wheel was a steep learning curve which accounts for the brake wear I believe.
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IO540 C4B5
Whirlwind 375HRT
Garmin G900X
First Flight 2/14/2019
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  #8  
Old 10-15-2019, 08:16 PM
TimO TimO is offline
 
Join Date: Feb 2005
Location: Wisconsin
Posts: 499
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They will always wear on the outside edges on the RV-10, due to reasons stated above. One minor correction though. When you swap tires, if you want the valve stems to be on the outside face, you'll have to dismount the tire from the rim and flip it on the rim. Swapping left and right tires will otherwise just be the same thing but from different sides of the plane. Figure that each set of tires you rotate just before the tread is gone on the outer edge, and then replace them when the other side gets the same way. (Assuming you haven't worn the centers by then)
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RV-10 N104CD - Flying 2/2006 - 1400+ hours http://www.MyRV10.com
RV-14 N14YT - Flying 6/2016 - 350+ hours http://www.MyRV14.com
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  #9  
Old 10-15-2019, 08:34 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
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Quote:
Originally Posted by BobTurner View Post
e. Demount the tires, swap left and right, double their life.
Poor English, I guess. Yes, I meant take them off the rims. If you also swap left and right, you wonít change the direction of rotation. Iím not sure if that is important or not.
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  #10  
Old 10-15-2019, 08:37 PM
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aturner aturner is offline
 
Join Date: Jan 2005
Location: Clarion, Pennsylvania
Posts: 525
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For whatever it is worth, I have more than 400 hours on my stock original tires and brakes. Tires will need replaced before too long (I did flip them once), but brakes have a lot of life left.
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RV-10 N784JC
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