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nose tire pressure

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dlm34077

Joined: 10 Feb 2007
Posts: 115
Location: AZ

Posted: Tue Oct 04, 2016 9:46 pm Post subject: nose tire pressure

A question and an observation.  

   

What pressure are we using in the nose tire?  

   

At 1100 TT on the aircraft, this morning I had my first maintenance issue away from home base. After landing and breakfast the nose tire was flat. Upon removal it looked as though the tube had been pinched in between the wheel halves. One bolt of the three was loose. I am trying to determine whether it was pinched several years ago when changed or perhaps loosened through use and perhaps slightly opened and pinched after a nose wheel side load. Any thoughts? After retrieving tools and spare tube from the baggage area and the use of a friendly FBO’s hangar, two hours later we were underway again.  

   

      	 		 			 				 			 		 		 			

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Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Wed Oct 05, 2016 6:06 am Post subject: nose tire pressure

IIRC the plans call for ~42psi.Â  I try to keep mine above 50. Our recent temperature drops will easily cause a 10% drop in pressure with out any other factors. I sort of recall some trying both high and low pressure to deal with shimmy issues.



Kelly



-sent from the I-droid implanted in my forearm

 

On Tue, Oct 4, 2016 at 10:42 PM, David <dlm34077(at)cox.net (dlm34077(at)cox.net)> wrote:

 	  Quote: 	
		               

A question and an observation.  

Â   

What pressure are we using in the nose tire?  

Â   

At 1100 TT on the aircraft, this morning I had my first maintenance issue away from home base. After landing and breakfast the nose tire was flat. Upon removal it looked as though the tube had been pinched in between the wheel halves. One bolt of the three was loose. I am trying to determine whether it was pinched several years ago when changed or perhaps loosened through use and perhaps slightly opened and pinched after a nose wheel side load. Any thoughts? After retrieving tools and spare tube from the baggage area and the use of a friendly FBOâ€™s hangar, two hours later we were underway again.  

Â   

   



   	 		 			 				 			 		 		 			

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

Bob Turner

Joined: 03 Jan 2009
Posts: 881
Location: Castro Valley, CA

Posted: Wed Oct 05, 2016 8:51 am Post subject: Re: nose tire pressure

I'm more concerned about the loose bolt than the tube. If the bolts fail the rims can come apart with a lot of force. I'd check the bolt carefully before re-installing. Make sure the lock nut cannot be turned by hand.

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_________________
Bob Turner
RV-10 QB

Lew Gallagher

Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC

Posted: Wed Oct 05, 2016 11:23 am Post subject: nose tire pressure

Hey Kelly,

  

 Glad to hear that you run at 50.  A side note:  Iâ€™ve redone too  many nose pants because the tire pressure gets low, there is not enough  clearance at the back of the tire opening and the tire doesnâ€™t recover fast  enough on landing so that it grabs the edge of the fiberglass and rips the tail  off the tail section in front of the brace baffle.  Am I the only one  seeing this?  Havenâ€™t seen it mentioned.

  

 Later, â€“ Lew

    

  From: Kelly McMullen (apilot2(at)gmail.com) 

 Sent: Wednesday, October 05, 2016 10:02 AM

 To: rv10-list(at)matronics.com (rv10-list(at)matronics.com) 

 Subject: Re: nose tire pressure

  



   IIRC the plans call for ~42psi.  I try to keep mine above 50. Our  recent temperature drops will easily cause a 10% drop in pressure with out any  other factors. I sort of recall some trying both high and low pressure to deal  with shimmy issues.



Kelly

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_________________
non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
Fly off completed !

rv10flyer(at)live.com
Guest

Posted: Wed Oct 05, 2016 11:52 am Post subject: nose tire pressure

Lew; 

It happens, but only once to me, I fixed it after that! 48 rear and 44 fronts by the way. No shimmy with unbalanced tires.  

    

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of lewgall(at)charter.net

 Sent: Wednesday, October 05, 2016 12:20 PM

 To: rv10-list(at)matronics.com

 Subject: Re: RV10-List: nose tire pressure 

 

 

     

Hey Kelly, 

  

  

  

Glad to hear that you run at 50.  A side note:  Iâ€™ve redone too many nose pants because the tire pressure gets low, there is not enough clearance at the back of the tire opening  and the tire doesnâ€™t recover fast enough on landing so that it grabs the edge of the fiberglass and rips the tail off the tail section in front of the brace baffle.  Am I the only one seeing this?  Havenâ€™t seen it mentioned. 

  

  

  

Later, â€“ Lew 

    

  

   

From: Kelly McMullen (apilot2(at)gmail.com)   

  

Sent: Wednesday, October 05, 2016 10:02  AM 

  

To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)  

  

Subject: Re: RV10-List: nose tire pressure 

 

 

  

  

 

    

IIRC the plans call for ~42psi.  I try to keep mine above 50. Our recent temperature drops will easily cause a 10% drop in pressure with out any other factors. I sort of recall  some trying both high and low pressure to deal with shimmy issues. 

 

Kelly

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flying-nut(at)cfl.rr.com
Guest

Posted: Wed Oct 05, 2016 12:33 pm Post subject: nose tire pressure

Davids problem started out with the pinched tube due to poor assembly 

techniques.  He's not alone so this isn't chastisement. I'm betting that 

90% of the airplane owners out there that do their own tire maintenance 

were never taught how.  I mean, how difficult can it be???  The bolt 

issue may have happened at the same time or occurred later.  We'll never 

know.



Back to my aviation mentor.  Everyone should have one.  He taught me how 

to change tires/tubes and how to prevent most problems.



1) Use plenty of talc .... everywhere except the bearings.   Talc the 

tube, inside of tire, and the parts of the wheel that will contact tube 

and tire.  Heavily talcing the wheel rim where the tire bead sits will 

be important when you take the tire off next time.  Don't forget the 

valve stem.  Lightly blow out excess talc from the inside of tire.  If 

there's a lot of excess talc it will end up in one place and can affect 

tire balance.



2) Take the valve core out of the valve stem.



3) Place the tube inside the tire and align valve stem with the dot on 

the tire.



4) Using your air gun inflate/deflate the tube a couple of times to 

remove any folds that may be there.  This is important.



5) Put the valve core back in and inflate the tube a little .... so the 

wheel halves need a little push to get seated.  You will not pinch the 

tube between the wheel halves if the tube has sufficient air in it.



6) Bolt the wheel halves together and torque to manufacturers 

recommendation.  They do vary.



7) Remove the valve core and use the blow gun to inflate/deflate a 

couple of times to make sure no folds exist.  Call it insurance.



 Put the tire back on the plane and air up until the outside tread 

just lifts off the ground.  Note the tire pressure if it makes you feel 

good.



9) Go fly!!!! 



Now for some comments.  YMMV.



When I change tires I always clean and regrease the bearings.  If the 

grease dries out between tire changes you aren't flying enough. I do not 

change tubes every time I replace the tire.  When they're out of the 

tire I over-inflate and look for checking in the tube. If there's any 

checking at all it's time to replace the tube.  Pay particular attention 

to the tube where the valve stem is.  I've never had a flat in over 40 

years of flying.



Linn .... still passionate about aviation after all those years

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