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  #11  
Old 10-06-2018, 06:04 PM
Maverick972 Maverick972 is offline
 
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Location: Plano, TX
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I run 37 PSI in my 7 as I am fairly new to the airplane not to tail wheel time, it has been the best combo of forgiveness, tread and I have never had any shimmy.
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  #12  
Old 10-07-2018, 11:08 AM
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JonJay JonJay is offline
 
Join Date: Jan 2007
Location: Battleground
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30psi in my 6.
First set of tires went 450 hours and still had a little tread. I am at 770 hours now and am just ready to flip them.
So, lower pressure = tire wear?

If I go over 25psi in the Bucker, get ready for Mr. Toads Wild Ride!
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  #13  
Old 10-07-2018, 11:18 AM
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flytoboat flytoboat is offline
 
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Location: Collinsville, IL
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Default Pressures

I talked to the good folks from Desser at OSH. He gave me a copy of this chart:
https://www.desser.com/content/pressure_chart.asp

He was adamant to keep AT LEAST 50 psi in my 5.00 x 5, 6 ply monsters at all times.
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  #14  
Old 10-07-2018, 11:39 AM
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Sam Buchanan Sam Buchanan is offline
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Quote:
Originally Posted by flytoboat View Post
I talked to the good folks from Desser at OSH. He gave me a copy of this chart:
https://www.desser.com/content/pressure_chart.asp

He was adamant to keep AT LEAST 50 psi in my 5.00 x 5, 6 ply monsters at all times.
I can understand why Desser would recommend max pressure in their tires, I suspect they want to make sure the tire can support the maximum rated load. However, our RVs are considerably lower weight than many certificated aircraft on which these tires might be used. Lower loads can be safely handled by lower tire pressure. Each RVer needs to use the pressure that works best with their particular aircraft.
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  #15  
Old 10-07-2018, 01:54 PM
alcladrv alcladrv is offline
 
Join Date: Oct 2006
Location: Southeast
Posts: 462
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In my -7A, I inflate the mains to 50 psi and the nose to 40. I have no issues with shimmy and shaking. I check them every couple of months or when the weather turns markedly colder and they're all usually down about 10 psi or so.
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  #16  
Old 10-07-2018, 07:02 PM
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flytoboat flytoboat is offline
 
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Quote:
Originally Posted by Sam Buchanan View Post
I can understand why Desser would recommend max pressure in their tires, I suspect they want to make sure the tire can support the maximum rated load. However, our RVs are considerably lower weight than many certificated aircraft on which these tires might be used. Lower loads can be safely handled by lower tire pressure. Each RVer needs to use the pressure that works best with their particular aircraft.
Sam,
The Desser guy said the reason for maintaining the pressure was to prevent breakdown of the structure under the tread (not the sidewalls). Not trying to argue, just passing along what I remember was said. Iím coming up on 300 hours on my monsters and just flipped them around for another year of flying. Iíll have another pair ordered for my next annual in October Ď19.
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  #17  
Old 10-08-2018, 03:48 PM
ericv ericv is offline
 
Join Date: Aug 2008
Location: eagle, co
Posts: 2
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Van's addressed tire pressure in the following service letter Nov. 9,2007
https://www.vansaircraft.com/pdf/Nos...ice_letter.pdf
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  #18  
Old 10-08-2018, 04:01 PM
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Sam Buchanan Sam Buchanan is offline
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Quote:
Originally Posted by ericv View Post
Van's addressed tire pressure in the following service letter Nov. 9,2007
https://www.vansaircraft.com/pdf/Nos...ice_letter.pdf
The service letter is in regard to nose wheel tires. This thread is about tire pressure on the taildragger RVs.
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  #19  
Old 10-08-2018, 04:07 PM
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Dan Langhout Dan Langhout is offline
 
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Location: Huntsville, AL USA
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Default Probably depends . . . . .

. . . . . on the individual airplane and it's particular leg damping. I have tried mine at many different pressures. 45 psi virtually always shimmied. 37 psi gave me shimmy under some conditions - 22 psi (yes I tried it) never gave any shimmy. I am currently at 32 psi and it seems to be in the "No Shimmy" zone. probably a winner for me.
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  #20  
Old 10-08-2018, 05:15 PM
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DanH DanH is offline
 
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Location: 08A
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Quote:
Originally Posted by Dan Langhout View Post
I am currently at 32 psi and it seems to be in the "No Shimmy" zone. probably a winner for me.
...in particular if the jack and spare tube are needed for ballast anyway

Kidding aside, the numbers don't lie. At 1800 lbs and 8.1 ft per/sec with 90% on the mains, the dead minimum is 36 psi if the inside of the tread is not expected to mash against the bead. Even at 36, consider the tube abuse with the sidewalls folded double while rolling.

I realize shimmy is a serious issue for the round leg models, but it is best to be aware that tire pressure is not a random pick item. Everybody drops one in eventually, and there are also pavement edges to consider.
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Last edited by DanH : 10-08-2018 at 05:19 PM.
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