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  #1  
Old 03-25-2021, 04:34 AM
Tony Petrone Tony Petrone is offline
 
Join Date: Nov 2019
Location: SagHarbor,New York and Naples Fl
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Default Tire pressure

What is the tire pressure for a RV7?
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  #2  
Old 03-25-2021, 04:41 AM
flysrv10 flysrv10 is offline
 
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Here you go.
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  #3  
Old 03-25-2021, 07:15 AM
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Sam Buchanan Sam Buchanan is offline
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Location: North Alabama
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Quote:
Originally Posted by Tony Petrone View Post
What is the tire pressure for a RV7?
This will be a process of finding the optimum pressure for your particular RV-7. You will see RVers using pressure as high as 45 and as low as high-20's. Much of this depends on whether or not your RV is prone to gear shimmy during taxi. If not then the higher pressures should work fine. If shimmy is a problem, you might experiment with lower pressure which will either inhibit shimmy or move it to a speed that is less problematic. On my RV-6 I start out with 35 and air the tires back up in a few months when they are down to 28 or so. This has been my standard practice since I started flying this plane in 1999.
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  #4  
Old 03-25-2021, 07:25 AM
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Jpm757 Jpm757 is offline
 
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Every RV seems to have its own "sweet spot" for main wheel tire pressure, depending on several factors including gear leg stiffeners, tire size and gear alignment. I have experimented between 25-40 psi for my mains and have settled on 30 psi running 380x150 oversize tires with wooden gear leg stiffeners. I have a Flyboys Condor II pneumatic tail wheel which likes 45 psi. These pressures seem to work well for my bird, with no main or tail wheel shimmey . My mains will develop a shimmey over 35 psi, and a grooved runway seems to exaggerate the problem.
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  #5  
Old 03-25-2021, 07:52 AM
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Walt Walt is offline
 
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If you run 25 I suggest you carry a jack and spare.
I run 45 all around on my A model.
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  #6  
Old 03-25-2021, 09:11 AM
XLS+PAT XLS+PAT is offline
 
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I recently added some Bluetooth tire pressure monitors that I found on Amazon $54. I put two on my RV7 and gave the other two to my hangar neighbor who also has an RV7. You screw them on to the air valve.
Just did a tire and tube change and started out at 37psi. The tire monitors connect to an APP on my iPhone. It reads both temperature and pressure. I compared the reading against my regular tire pressure gauge and it seems accurate.
I did a test flight with two full stop taxi backs. When I got back to the hangar I checked the APP and it showed 40psi and a temperature increase of about five degrees C.
To add air to my tires requires me to take half of the wheel pant off to access the air valve. So far these monitors are working great.
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  #7  
Old 03-25-2021, 09:20 AM
RVDan RVDan is offline
 
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Quote:
Originally Posted by Walt View Post
If you run 25 I suggest you carry a jack and spare.
I run 45 all around on my A model.
I can attest to that. Was experimenting trying to solve a vib issue and lost a tire in landing when it slipped on the rim. The tire was still good but it went flat with a leak at the stem junction.
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  #8  
Old 03-25-2021, 10:01 AM
uk_RV9A uk_RV9A is offline
 
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If I recall correctly the RV9 build manual specifies 25psi. Usually run between that and 30.
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  #9  
Old 03-25-2021, 10:24 AM
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Carl Froehlich Carl Froehlich is offline
 
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Quote:
Originally Posted by RVDan View Post
I can attest to that. Was experimenting trying to solve a vib issue and lost a tire in landing when it slipped on the rim. The tire was still good but it went flat with a leak at the stem junction.
+1. This happened to me once. Since then I keep them at 40-42 and have not had a recurrence.

Low tire pressure to fix a shimmy is a bad bandaid at best. Balance the tires and for nose wheel guys use the very nice Matco axle instead of the stock set up: http://www.matcomfg.com/AXLEASSEMBLY...dv-3657-1.html

Carl
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  #10  
Old 03-25-2021, 11:34 AM
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Sam Buchanan Sam Buchanan is offline
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Yeah, but did you prime your wheels?

I knew this thread would prompt all sorts of blanket statements and dire predictions, these tire pressure threads are very predictable. But maybe the original poster can see that optimum tire pressure may be dependent on his particular RV-7.
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Last edited by Sam Buchanan : 03-25-2021 at 11:38 AM.
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