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  #1  
Old 11-01-2021, 09:34 PM
seanfranklin seanfranklin is offline
 
Join Date: Oct 2021
Location: New York, Ny, Usa
Posts: 1
Default Safe tire pressure

Hi, Does anyone know the safe tire pressure of rv3b 3.80x150 600-5 6? Thanks for helping!
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  #2  
Old 11-01-2021, 11:07 PM
yarddart yarddart is offline
 
Join Date: Jun 2006
Posts: 191
Default Tire pressure

25 psi tire pressure
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  #3  
Old 11-02-2021, 02:05 AM
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rv8ch rv8ch is offline
 
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Location: LSGY
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Quote:
Originally Posted by seanfranklin View Post
Hi, Does anyone know the safe tire pressure of rv3b 3.80x150 600-5 6? Thanks for helping!
I run about 45psi with my RV-8 with these larger tires. I'm also using the michelin airstop tubes, which are expensive but they have not leaked more than about a psi or two in a year.

I think I've seen numbers on the VAF from about 20psi to about 50psi.
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  #4  
Old 11-02-2021, 04:35 AM
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Bob Martin Bob Martin is offline
 
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Location: Charlottesville, Virginia
Posts: 1,279
Default Tire Pressure

I run 45 to 50....
Had flats with low pressures
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RV-6, 0-360 Hartzell C/S, Tip up, 1200+TT
James extended cowl/plenum, induction, -8VS and Rudder. TSFlightline hoses. Oregon Aero leather seats.
D100-KMD150-660-TT ADI2- AS air/oil seperator. Vetterman exhaust with turndown tips.
Louisa, Virginia KLKU N94TB
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  #5  
Old 11-02-2021, 11:45 AM
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Ironflight Ironflight is offline
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Location: Dayton, NV
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Let’s see - the question is on an RV-3….two answers for other planes already!

We actually run fairly low tire pressures on our -3 (28 psi) because that is the sweet spot for damping out gear shimmy. We run considerably higher pressures on our other RV’s, but this is the number that works with our gear dynamics. If I can find the time to play around a bit, I want to convert the -3 from wood dampers to metal, and see if that works well and I can raise the tire pressures….but I have other projects with higher priority!

Paul
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  #6  
Old 11-02-2021, 01:17 PM
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Bob Martin Bob Martin is offline
 
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Quote:
Originally Posted by Ironflight View Post
Letís see - the question is on an RV-3Ö.two answers for other planes already!

We actually run fairly low tire pressures on our -3 (28 psi) because that is the sweet spot for damping out gear shimmy. We run considerably higher pressures on our other RVís, but this is the number that works with our gear dynamics. If I can find the time to play around a bit, I want to convert the -3 from wood dampers to metal, and see if that works well and I can raise the tire pressuresÖ.but I have other projects with higher priority!

Paul
Paul, Yes I responded .......I didn't know the -3 had a different dynamic. Tks.
On the dampers....I had trouble getting the wood with glass wrap to fit under the standard fairing, so I pondered the problem.
I wound up using a fiberglass rod, about 1/2" in Diameter and sticking it on with marine adhesive. So it flexes some and even the adhesive can give too.
Small and strong, located on back side of gear. No issues with the fairing now. I did jack the plane up to install while the gear leg was straight.
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Bob Martin
RV-6, 0-360 Hartzell C/S, Tip up, 1200+TT
James extended cowl/plenum, induction, -8VS and Rudder. TSFlightline hoses. Oregon Aero leather seats.
D100-KMD150-660-TT ADI2- AS air/oil seperator. Vetterman exhaust with turndown tips.
Louisa, Virginia KLKU N94TB
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  #7  
Old 11-02-2021, 01:46 PM
swordtail swordtail is offline
 
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6A - 50 lbs. all three
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  #8  
Old 11-02-2021, 02:17 PM
TheBebo TheBebo is offline
 
Join Date: Jul 2017
Location: Dallas, TX
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I run 30psi on the 3. Anything more and I get a bad shimmy, anything less and I go through tires/tubes quickly.

It varies on your build, depending on the dampening the legs have and how much movement you get. The runway I operate out of has some small bumps at seams in the concrete, which makes problems worse when running higher than 30psi, smooth surfaces no issues at 35-40psi.

I'd test out various pressures and find what works for you.
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  #9  
Old 11-04-2021, 03:04 PM
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smokyray smokyray is offline
 
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Default The Air up there...

Quote:
Originally Posted by seanfranklin View Post
Hi, Does anyone know the safe tire pressure of rv3b 3.80x150 600-5 6? Thanks for helping!
Sean,
I have been running 380x150x5 tires on all three of my RV's/HR2 since 2003. I based my air pressure (like most back country pilots) on weight and "landing area" conditions. (airport for most on this site) The 380 has a larger footprint than the standard 500:5 and has a sweet spot for shimmy, tire wear and ease of moving around as mentioned above on pavement is 30PSI. My short gear RV4 was very similar to the RV3 geometry with wood or no dampeners. Shimmy can be eliminated entirely by avoiding paved runways! If you frequent mud, gravel, soft turf or sandy conditions I used 20-25PSI in the 380. Heavier airplanes like my 1150lb HR2 40 PSI worked well all the time.

The Aero Classic 380x150x5 truly is the preferred RV tire IMHO, a far superior load and footprint.
V/R
Smokey

Last edited by smokyray : 11-04-2021 at 03:18 PM.
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