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raimo.toivio(at)rwm.fi
Guest

Posted: Thu Sep 17, 2009 1:54 am Post subject: Mono Inner Tyre Failures

All

  

 I have lost without visible or known reason two innner  tyres in my Monowheel.

  

 Loosing suddenly main gear´s air pressure is not a funny  game and did not make my day actually.

 Both of them have been original -Europa  supply.

 That means they are Indonesian made Deli Co´s "Nanco"  8.00 x6/7 TR-87 -type.

 Both times I have found a very little crack (dry rot they  say) on the sidewalls.

 Google "Nanco problems" ...

 Main /outer tyre (Airtrac) is unhurt and a new  like.

  

 May I please get a recommendation about a good quality  inner tyre?!

  

 Kind Regards,

  

 Raimo from Finland

 OH-XRT 139 hrs 280 landings

  

  

  

  

    [quote][b]

paul.the.aviator(at)gmail
Guest

Posted: Thu Sep 17, 2009 4:35 am Post subject: Mono Inner Tyre Failures

Hi,



I have this happen regularly.  I now just change them every 100 hours

and I never travel without my jacking block and a spare inner tube.  I

have tried inner tube talcum powder and different pressures with out

much improvement.



The failure mode seems to be chafing on the side wall due to running

such  low pressure.



Paul



On Thu, Sep 17, 2009 at 5:02 AM, Raimo Toivio <raimo.toivio(at)rwm.fi> wrote:

 	  Quote: 	
		   All



 I have lost without visible or known reason two innner tyres in my

 Monowheel.



 Loosing suddenly main gear´s air pressure is not a funny game and did not

 make my day actually.

rampil

Joined: 04 May 2007
Posts: 870

Posted: Thu Sep 17, 2009 1:59 pm Post subject: Re: Mono Inner Tyre Failures

Rubber deteriorates by oxidation, the process is accelerated by

heat and flexing, conditions that exist inside tires.  This may have 

something to do with why inner tubes are no longer used in most

motor vehicles.

_________________
Ira N224XS

raimo.toivio(at)rwm.fi
Guest

Posted: Fri Sep 18, 2009 12:45 am Post subject: Mono Inner Tyre Failures

Terve!



I cannot accept this! It should not be a part of our life we live (and fly) nowadays !

Landing with empty tyre could hurt seriously in the worst case scenario.



There must be something to prevent this happening so often or even better - never!



I used also talcum powder and now the whole plane smells roses (I asked powder with jet fuel smell but they have not!).



What´s  your tire pressure, Paul? I have used always 2,2 PSI = 2,4 kg/cm2 (that´s about double they recommend).



BTW it is easy to check: in my case 2,2 PSI equals 162 mm = 6,38" from the asphalt surface to the lowest point of the main axle (port side). That is a poor man´s Mono Main Tyre´s Pressure Gauge.



Raimo OH-XRT



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raimo.toivio(at)rwm.fi
Guest

Posted: Fri Sep 18, 2009 1:12 am Post subject: Mono Inner Tyre Failures

I made a mistake w pressure units - sorry:



1 bar = 10 N/cm2 = (about) 1 kp/cm2 = 1 kg/cm2.



1 PSI = pound/inc2 = 0,454 kg/6,45 cm2 = 0,07 bar



1 bar = 14,3 PSI.



Raimo

---

rlborger(at)mac.com
Guest

Posted: Fri Sep 18, 2009 5:43 am Post subject: Mono Inner Tyre Failures

Carl,



Please explain further for our European friends who are probably not  

aware of the product.



Bob Borger

Europa Kit #A221 N914XL, XS Mono, Intercooled 914, Airmaster C/S

http://www.europaowners.org/N914XL

Aircraft Flying!

3705 Lynchburg Dr.

Corinth, TX  76208

Home:  940-497-2123

Cel:  817-992-1117



On Sep 18, 2009, at 6:35, Carl Pattinson wrote:



[quote] 

 >



 Very easy solution - its called "slime". No more flat tyres.



 http://www.slime.com/index.php

 ---

acrojim7534(at)YAHOO.COM
Guest

Posted: Sun Sep 20, 2009 4:13 am Post subject: Mono Inner Tyre Failures

Paul

  

 I have been following this thread on flats, and I have a few points to make, that have worked for me.

  

 I have been flying my monowheel almost ten years off paved runway's...My kit included the old "tundra tire" and instructions to use low pressure,(I don't remember PSI, but the sidewalls rubbed the Landing gear frame.) The plane taxied like it was runing in mud..

  

 I changed that tire at about 20 hours to a 700 X 6 and 6 plys and used 30 PSI. The plane is much easier to taxi, take off's are much quicker, and in 800 hours I have replaced two tires that were worn out. No flats !!!! I can't say that the air pressure is the problem, and also I don't fly off grass, but I have not had the problems that so many of you are having.

  

 On another note having made the above change I also changed the outrigger lengths, as the new tire, with higher pressure made the original outriggers to short. Over the past ten years I have extened the outriggers in length, to now when the plane is parked, both outriggers touch the ground. For me ground handling is much better, and in landing with the longer outriggers the "rocking from one outrigger to the other" is now gone.

  

 Also another question ? Are the flats limited to the Monowheels ??? Are are the tri gears having this problem? 

  

 Jim Brown

 XS Monowheel.



--- On Thu, 9/17/09, Paul McAllister <paul.the.aviator(at)gmail.com> wrote:



  	  Quote: 	
		  

From: Paul McAllister <paul.the.aviator(at)gmail.com>

Subject: Re: Mono Inner Tyre Failures

To: europa-list(at)matronics.com

Date: Thursday, September 17, 2009, 12:32 PM



 --> Europa-List message posted by: Paul McAllister <paul.the.aviator(at)gmail.com (paul.the.aviator(at)gmail.com)>



Hi,



I have this happen regularly.  I now just change them every 100 hours

and I never travel without my jacking block and a spare inner tube.  I

have tried inner tube talcum powder and different pressures with out

much improvement.



The failure mode seems to be chafing on the side wall due to running

such  low pressure.



Paul



On Thu, Sep 17, 2009 at 5:02 AM, Raimo Toivio <raimo.toivio(at)rwm.fi (raimo.toivio(at)rwm.fi)> wrote:

 	  Quote: 	
		   All



 I have lost without visible or known reason two innner tyres in my

 Monowheel.



 Loosing  suddenly main gear´s air pressure is not a funny game and did not

&gtom/Navigator?Europa-List" target=_blank>http://www.matronics.com/Navigatosp;              - MATRONICS WEB FO/" ;               -Matt Dralle, List Admin==========
	






	


           [quote][b]

fklein(at)orcasonline.com
Guest

Posted: Sun Sep 20, 2009 8:47 am Post subject: Mono Inner Tyre Failures

On Sep 20, 2009, at 5:10 AM, Jim Brown wrote:



 	  Quote: 	
		   Over the past ten years I have extened the outriggers in length, to  

 now when the plane is parked, both outriggers touch the ground. For  

 me ground handling is much better, and in landing with the longer  

 outriggers the "rocking from one outrigger to the other" is now gone.


	


Jim,



Have you made the outriggers longer incrementally over the years or in  

one fell swoop?



Would you venture an opinion as to whether or not the shorter legs  

were advantageous initially as you familiarized yourself w/ the mono?



Sounds like you've had excellent results w/ the smaller tire at higher  

pressure on the hardsurface runways you use...thanks for putting your  

oar in to this discussion.



Fred

A194 XS mono

ami(at)mcfadyean.freeserv
Guest

Posted: Sun Sep 20, 2009 11:25 am Post subject: Mono Inner Tyre Failures

<< Are  the tri gears having this problem?>>

 Or the Taildraggers; the answer to which is no, except early on when using  cheaper non-aviation inner tubes resulting in two punctures, one during  landing.

 These appeared to have resulted from internal abrasion/stressing of the  inner tube (possibly some dirt in there), rather than from a projectile. Therein  should lie a lesson.

  

 The proper inner tubes have lasted 350+ hours, although don't hold air as  well as would be expected; may try some 'Slime'-equivalent!.

  

 Duncan McF

 [quote]   ---

kjburns(at)btinternet.com
Guest

Posted: Sun Sep 20, 2009 1:13 pm Post subject: Mono Inner Tyre Failures

Anyone running nitrogen instead of air ?

 Common aviation practice, it is inert, and removing oxygen results in less rubber corrosion, more stable tyre pressures with temperature change.

On a pushbike inner tube I have observed seams that wear out causing punctures due to side wall flex.

 Tyre side wall failure stressing and wearing through the side wall causing punctures.

Side wall flex increases with lower tyre presures and heat build up.

Buy the best quality tubes (and tyres) you can get..thickest rubber from recognised manufacturers...Chinese rubbers are not as corrosive resistant and age leak earlier.

I used slime on a 120 hp motorcycle and pulled three nails out in consecutive weeks with no loss of pressure (tubless)and used the bike untill the tyre wore out as a chase bike while instructing...

Was originaly recognised as a safety feature(it works) but sold now in UK for ATV/off road use due to fears of litigation..(tyre will fail catastropicaly if side wall/cord is damaged) (I also ran my MC school bikes on it and it saved down time,but on tubed rims any puncture object would be removed & new tube fitted in case it the tube splits.

Daily inspection of wheels should include pressure..learn to judge from tyre profile & contact area, tyre creep, paint on tell tails.

Side wall damage,cuts splits especialy cords, bulges...run your hand around the profile and feel for bulges (Snapped internal cords/failed carcase)can feel like an out of balance wheel when rolling.

Also inspect hub for damage and tail wheel rotates on its bearings.

On a motorcycle we increase tyre pressure for additional load to compensate for additional tyre wall flex,maintain proper contact patch and grip for braking, I allowed 5 psi increase for 150 lb load increase (medium passenger)..Use as rule of thumb adjust acording to fuel load also?

Use your eyes and look at which parts of your tyre is wearing out first..centre thin line, too high a presure.

outer of the tyre too soft increase.

5 psi at a time from recomended is a safe comparison point.

Use an acurate gauge when starting to measure.

Keep wheel wells,spats, and frames clear of dried mud.

If you have a tri gear drift will show as scrubbing to one half of the tyre or other..Double the life of your tyres by rotating them (thicker tread is more puncture resistant) either on same axle or opposite axels if tyre rotation arrows are uni-directional.

Examine your tubes for sidewall chaffing while they are out.

Kerbing any vehicles tyre can damage the structure of the tyre,tracking steering and suspension..be carefull changing from grass to hardstandings.

Pick up and dispose of foreign objects around the hanger and pad.

Practice your tyre checking on your car, pushbike,motorcycle..unusual wear patterns all try to tell you what is going on.

To summerise PILECK  Pressures Inspect Load Clean Enviroment Kerbs

Regards

Kevin

--- On Sun, 20/9/09, Duncan & Ami McFadyean <ami(at)mcfadyean.freeserve.co.uk> wrote:

 	  Quote: 	
		   From: Duncan & Ami McFadyean <ami(at)mcfadyean.freeserve.co.uk>

 Subject: Re: Mono Inner Tyre Failures

 To: europa-list(at)matronics.com

 Date: Sunday, 20 September, 2009, 8:12 PM

 << Are 

 the tri gears having this

 problem?>>

 Or the Taildraggers; the answer to which is no, except

 early on when using 

 cheaper non-aviation inner tubes resulting in two

 punctures, one during 

 landing.

 These appeared to have resulted from internal

 abrasion/stressing of the 

 inner tube (possibly some dirt in there), rather than from

 a projectile. Therein 

 should lie a lesson.

 The proper inner tubes have lasted 350+ hours,

 although don't hold air as 

 well as would be expected; may try some

 'Slime'-equivalent!.

 Duncan McF

   ----- Original Message

 ----- 

   From: 

   Jim 

   Brown 

   To: europa-list(at)matronics.com

   Sent: Sunday,

 September 20, 2009 1:10 

   PM

   Subject: Re:

 Mono Inner Tyre 

   Failures

         Paul

         I have been following this thread on

 flats, and I have a few 

         points to make, that have worked for me.

         I have been flying my monowheel almost ten

 years off paved 

         runway's...My kit included the old "tundra

 tire" and instructions to use 

         low pressure,(I don't remember PSI, but the

 sidewalls rubbed the Landing 

         gear frame.) The plane taxied like it was runing in

 mud..

         I changed that tire at about 20 hours to a 700

 X 6 and 6 plys and 

         used 30 PSI. The plane is much easier to taxi, take

 off's are much 

         quicker, and in 800 hours I have replaced two tires

 that were worn out. 

         No flats !!!! I can't say that the air pressure

 is the problem, and also 

         I don't fly off grass, but I have not had the

 problems that so many of 

         you are having.

         On another note having made the above change I

 also changed the 

         outrigger lengths, as the new tire, with higher

 pressure made the 

         original outriggers to short. Over the past ten

 years I have extened the 

         outriggers in length, to now when the plane is

 parked, both outriggers 

         touch the ground. For me ground handling is much

 better, and in landing 

         with the longer outriggers the "rocking from

 one outrigger to the other" 

         is now gone.

         Also another question ? Are the flats limited

 to the Monowheels ??? 

         Are are the tri gears having this

 problem? 

         Jim Brown

         XS Monowheel.

 --- On Thu, 9/17/09, Paul McAllister 

         <paul.the.aviator(at)gmail.com>

 wrote:

 From: 

           Paul McAllister

 <paul.the.aviator(at)gmail.com>

 Subject: Re: 

           Mono Inner Tyre Failures

 To: 

           europa-list(at)matronics.com

 Date: Thursday, September 17, 2009, 12:32 

           PM

           --> Europa-List message

 posted by: Paul 

           McAllister <paul.the.aviator(at)gmail.com>

 Hi,

 I 

           have this happen regularly.  I now just

 change them every 100 

           hours

 and I never travel without my jacking block and a spare

 inner 

           tube.  I

 have tried inner tube talcum powder and different 

           pressures with out

 much improvement.

 The failure mode seems 

           to be chafing on the side wall due to running

 such  low 

           pressure.

 Paul

 On Thu, Sep 17, 2009 at 5:02 AM, Raimo 

           Toivio <raimo.toivio(at)rwm.fi> 

           wrote:

 > All

 >

 > I have lost without visible or 

           known reason two innner tyres in my

 > Monowheel.

 >

 > 

           Loosing suddenly main gear´s air pressure is not

 a funny game and did 

           not

 >om/Navigator?Europa-List" 

 target=_blank>http://www.matronics.com/Navigatosp;  

                    -

 MATRONICS WEB FO/" ;   

                       -Matt

 Dralle, List 

           Admin==========

 href="http://www.matronics.com/Navigator?Europa-List">http://www.matronhref="http://forums.matronics.com">http://forums.matronics.com

 href="http://www.matronics.com/contribution">http://www.matronics.com/c

ptag.dev(at)tiscali.co.uk
Guest

Posted: Sun Sep 20, 2009 1:44 pm Post subject: Mono Inner Tyre Failures

Hi! Jim   

I have had the problem with failure of the nose wheel inner tubes at their seams. Especially before I researched slightly different size tubes. The originals were too large a diameter on the “balloon” dimension and so always inflated with a crease in them.  

Regards  

Bob Harrison G-PTAG  

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Jim Brown

 Sent: 20 September 2009 13:11

 To: europa-list(at)matronics.com

 Subject: Re: Europa-List: Mono Inner Tyre Failures  

Paul   

I have been following this thread on flats, and   I have a few points to make, that have worked for me.   

I have been flying my monowheel almost ten years off   paved runway's...My kit included the old "tundra tire" and   instructions to use low pressure,(I don't remember PSI, but the sidewalls   rubbed the Landing gear frame.) The plane taxied like it was runing in mud..   

I changed that tire at about 20 hours to a 700 X 6   and 6 plys and used 30 PSI. The plane is much easier to taxi, take off's are   much quicker, and in 800 hours I have replaced two tires that were worn out.   No flats !!!! I can't say that the air pressure is the problem, and also I   don't fly off grass, but I have not had the problems that so many of you are   having.   

On another note having made the above change I also   changed the outrigger lengths, as the new tire, with higher pressure made the   original outriggers to short. Over the past ten years I have extened the   outriggers in length, to now when the plane is parked, both outriggers touch   the ground. For me ground handling is much better, and in landing with the   longer outriggers the "rocking from one outrigger to the other" is   now gone.   

Also another question ? Are the flats limited to the   Monowheels ??? Are are the tri gears having this problem?    

Jim Brown   

XS Monowheel.

   --- On Thu, 9/17/09, Paul McAllister <paul.the.aviator(at)gmail.com>   wrote:   

    	  Quote: 	

   From: Paul McAllister <paul.the.aviator(at)gmail.com>

   Subject: Re: Europa-List: Mono   Inner Tyre   Failures

   To: europa-list(at)matronics.com

   Date: Thursday, September 17, 2009, 12:32 PM      

--> Europa-List message posted by: Paul McAllister <paul.the.aviator(at)gmail.com (paul.the.aviator(at)gmail.com)>

   Hi,

   I have this happen regularly.  I now just change them every 100 hours

   and I never travel without my jacking block and a spare inner tube.  I

   have tried inner tube talcum powder and different pressures with out

   much improvement.

   The failure mode seems to be chafing on the side wall due to running

   such  low pressure.

   Paul

   On Thu, Sep 17, 2009 at 5:02 AM, Raimo Toivio <raimo.toivio(at)rwm.fi (raimo.toivio(at)rwm.fi)> wrote:

   > All

   >

   > I have lost without visible or known reason two innner tyres in my

   > Monowheel.

   >

   > Loosing suddenly main gear´s air pressure is not a funny game and did   not

   &gtom/Navigator?Europa-List"   target=_blank>http://www.matronics.com/Navigatosp;                - MATRONICS WEB FO/" ;                 -Matt Dralle, List Admin==========

      <![if !supportLineBreakNewLine]>   <![endif]>   

    	  Quote: 	
		              - The Europa-List Email Forum ---> http://www.matronics.com/Navigator?Europa-List 	
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       [quote][b]

acrojim(at)cfl.rr.com
Guest

Posted: Sun Sep 20, 2009 3:47 pm Post subject: Mono Inner Tyre Failures

Fred

I think this is the 4th set of outriggers I have replaced over the years. Each set was made longer,about 1/2 inch each time. My monowheel is an XS model,and not the classic so there may be a difference in lengths of the outriggers as supplied by the factory???

In looking back when I was learning to land the monowheel, FOR ME I think the learning curve would have gone better had the outriggers been longer... Let me explain....During landings,after touchdown, the rocking from side to side of the wings with the short outriggers gave me the inpression that the plane was starting to turn to one side or the other, and I sometime corrected  for a turn, when there was no turn. It took a while for my brain and my feet to come togather in my mind. Before I started flying the monowheel, I had acculuminated 1000 plus hours in a Pitts S-1-S which I owned. My perspective of what was going on outside the monowheel during the landing roll out, was affected by what I had seen in the Pitts.

I'm not sure how a low time pilot might feel, or be aware of what is happing in the landing roll out of their monowheel.

I don't know if anyone has posted their thoughts on this subject.....but please DO NOT change out the outriggers on your plane on basis of my experience.

Please understand I am not suggesting that anyone run out and change outriggers for longer ones.

Jim Brown.

---- Fred Klein <fklein(at)orcasonline.com> wrote: 

 	  Quote: 	

 On Sep 20, 2009, at 5:10 AM, Jim Brown wrote:

 > Over the past ten years I have extened the outriggers in length, to  

 > now when the plane is parked, both outriggers touch the ground. For  

 > me ground handling is much better, and in landing with the longer  

 > outriggers the "rocking from one outrigger to the other" is now gone.

 Jim,

 Have you made the outriggers longer incrementally over the years or in  

 one fell swoop?

 Would you venture an opinion as to whether or not the shorter legs  

 were advantageous initially as you familiarized yourself w/ the mono?

 Sounds like you've had excellent results w/ the smaller tire at higher  

 pressure on the hardsurface runways you use...thanks for putting your  

 oar in to this discussion.

 Fred

 A194 XS mono

budyerly(at)msn.com
Guest

Posted: Sun Sep 20, 2009 6:23 pm Post subject: Mono Inner Tyre Failures

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Interesting to note:

  

 Tire pressure is the key.  The lower the pressure the more wear on the  side wall.  I see the older mono's with cracks in the sidewalls running  12-14 lbs of pressure on the 7 inch tire so as to control the bounce  (theoretically).  The normal pressure by the book for the 8 inch tire is 18  lbs.  But none is stated for the 7 inch tire in the operations  manual...  Typically the tire should be inflated to about 30 lbs according  to Air Trac.

  

 The original outrigger length was set for the Classic tail wheel located at  the rear bulkhead.  The tail wheel was lower and the outriggers were  shorter.  With the tail wheel stinger, the outriggers were too short and  were eventually lengthened.  The new tail wheel conversion mod for the  old Classic tail wheel to stinger increases the outrigger length by about an  inch and a half.

  

 After talking years ago with Jim Brown and Andy Draper, I helped Joe Like  set up his aircraft with the longer leg lengths.  Joe was a low time pilot  with a little Aeronca Champ time.  By adjusting his outrigger leg lengths  to just rest on the ground when the plane was only loaded with fuel, helped him  with the horrible leans that can throw off the novices attempt at directional  control.  Joe has the 7 inch main tire as most of you all.  Joe  now has 150 plus hours without incident operating off of concrete.  So  Jim has sage advice.

  

 Each plane requires a slightly different outrigger measurement, but it  appears worth the effort to make the outriggers so they just touch the ground so  as to help overall control.

  

 Just my thoughts.  I only have a few landings in the mono, and the  weather was calm.  No ill affects with this setup. I also never  allowed a deviation more than a inch or two on takeoff or landing.  Let's  just say I had happy feet and a tight set of muscles.

  

 Bud Yerly

 Tri-gear, 914



   [quote][b]

raimo.toivio(at)rwm.fi
Guest

Posted: Mon Sep 21, 2009 2:40 am Post subject: Mono Inner Tyre Failures

I did not know there are different sealants for tubed ja tubeless tyres!

I have once made my day (or in fact my summer) with this stuff but this time it did not help.

Maybe it was wrong stuff for tubeless tyre types ?



Raimo

---

craigb(at)onthenet.com.au
Guest

Posted: Mon Sep 21, 2009 3:39 am Post subject: Mono Inner Tyre Failures

FWIW, in heavy  transport, tyre pressures are vital in ensuring tyre life, a tyre than  underinflated

 by as little as  10% can and does have its life shortened by as much as 95%, due to excessive  flexing

 of the side  walls causing overheating and delamination, which generally results in total and  complete

 failure with  little to no warning. No doubt some of you would have seen a truck tyre explode  on the

 freeway for no  apparent reason

   [quote][b]

raimo.toivio(at)rwm.fi
Guest

Posted: Mon Sep 21, 2009 4:12 am Post subject: Mono Inner Tyre Failures

OM XS Monowheel August 1998 Page 7-4:

  

 - tyre pressure for correct inflation - 18 PSI (1,2  bar)

  

 Is not that too flat?

 I have used almost double (2,2 bar)

 No landing or handling difficulties.

  

 Raimo OH-XRT

 [quote]   ---

ptag.dev(at)tiscali.co.uk
Guest

Posted: Mon Sep 21, 2009 10:11 am Post subject: Mono Inner Tyre Failures

Raimo......IMHO the product which is being promoted is NOT for tubless tyres

utilizing a split wheel centre such an item does not exist because it is

impossible to seal the split centre. However there are products which when

inserted in the wheel/tyre which are in foam form and when exposed to air

they cure as a solid foam. To get the wheel centre out of this "mess" the

tyre would need to be cut from the rim.(not forgetting the weight factor.)

Regards

Bob Harrison



--

acrojim7534(at)YAHOO.COM
Guest

Posted: Mon Sep 21, 2009 11:55 am Post subject: Mono Inner Tyre Failures

Bob;

  

 We had the same problem on our RV-7A that our son flys.It went flat after he had landed...

 No damage, but we also went to different size on the nose gear tube....

  

 JimBrown



--- On Sun, 9/20/09, Robert C Harrison <ptag.dev(at)tiscali.co.uk> wrote:



  	  Quote: 	
		  

From: Robert C Harrison <ptag.dev(at)tiscali.co.uk>

Subject: RE: Mono Inner Tyre Failures

To: europa-list(at)matronics.com

Date: Sunday, September 20, 2009, 9:43 PM



       

Hi! Jim 

 

I have had the problem with failure of the nose wheel inner tubes at their seams. Especially before I researched slightly different size tubes. The originals were too large a diameter on the â€œballoonâ€ dimension and so always inflated with a crease in them.

 

Regards

 

Bob Harrison G-PTAG

 

 

    

 

From: owner-europa-list-server(at)matronics.com [mailto: owner-europa-list-server(at)matronics.com ] On Behalf Of Jim Brown

Sent: 20 September 2009 13:11

To: europa-list(at)matronics.com

Subject: Re: Europa -List: Mono Inner Tyre Failures



 

 

      

Paul



  

 



  

I have been following this thread on flats, and I have a few points to make, that have worked for me.



  

 



  

I have been flying my monowheel almost ten years off paved runway's...My kit included the old "tundra tire" and instructions to use low pressure,(I don't remember PSI, but the sidewalls rubbed the Landing gear frame.) The plane taxied like it was runing in mud..



  

 



  

I changed that tire at about 20 hours to a 700 X 6 and 6 plys and used 30 PSI. The plane is much easier to taxi, take off's are much quicker, and in 800 hours I have replaced two tires that were worn out. No flats !!!! I can't say that the air pressure is the problem, and also I don't fly off grass, but I have not had the problems that so many of you are having.



  

 



  

On another note having made the above change I also changed the outrigger lengths, as the new tire, with higher pressure made the original outriggers to short. Over the past ten years I have extened the outriggers in length, to now when the plane is parked, both outriggers touch the ground. For me ground handling is much better, and in landing with the longer outriggers the "rocking from one outrigger to the other" is now gone.



  

 



  

Also another question ? Are the flats limited to the Monowheels ??? Are are the tri gears having this problem? 



  

 



  

Jim Brown



  

XS Monowheel.



--- On Thu, 9/17/09, Paul McAllister < paul.the.aviator(at)gmail.com > wrote:



  	  Quote: 	
		   



From: Paul McAllister < paul.the.aviator(at)gmail.com >

Subject: Re: Europa -List: Mono Inner Tyre Failures

To: europa-list(at)matronics.com

Date: Thursday, September 17, 2009, 12:32 PM

  

--> Europa -List message posted by: Paul McAllister <paul.the.aviator(at)gmail.com>



Hi,



I have this happen regularly.  I now just change them every 100 hours

and I never travel without my jacking block and a spare inner tube.  I

have tried inner tube talcum powder and different pressures with out

much improvement.



The failure mode seems to be chafing on the side wall due to running

such  low pressure.



Paul



On Thu, Sep 17, 2009 at 5:02 AM, Raimo Toivio <raimo.toivio(at)rwm.fi> wrote:

 	  Quote: 	
		   All



 I have lost without visible or known reason two  innner tyres in my

 Monowheel.



 Loosing suddenly main gearÂ´s air pressure is not a funny game and did not

&gtom/Navigator? Europa -List" target=_blank>http://www.matronics.com/Navigatosp;              - MATRONICS WEB FO/" ;               -Matt Dralle, List Admin==========
	






	
 

 

 	  Quote: 	
		                - The

 Europa -List Email Forum ---> http://www.matronics.com/Navigator?Europa-List               - MATRONICS WEB FORUMS -             - List Contribution Web Site -                              -Matt Dralle, List Admin.  	
0 	  Quote: 	
		    	
1

 	  Quote: 	
		    	
2

	


         [quote][b]

garrys(at)tampabay.rr.com
Guest

Posted: Mon Sep 21, 2009 12:50 pm Post subject: Mono Inner Tyre Failures

Jim Brown..........what size nose gear tube did you  use?

  

 Garry Stout

  

 [quote]   ---

ptag.dev(at)tiscali.co.uk
Guest

Posted: Mon Sep 21, 2009 12:54 pm Post subject: Mono Inner Tyre Failures

Thanks for that info. Jim.I have had about 4  failed tubes in two tyres since Sept 2000. I had thought it was just me being “Johna” ! until I rumbled the alternative size for the 4" nose wheel tube size which I have resorted to now is a KINGS TIRE 11x4.00-5 Which for some reason is of smaller cross section balloon size than the original KINGS TIRE 4.10/3.50-5  Both have the 90deg bent metal valve. And were supplied by WATTS Aviation Tyres.     

www.wattsaviation.co.uk/  

However I spoke to John Bell at Watts tyres today and he says that the selection of tubes is a black art due to manufacturers trying to cater for  wide tyre sizes.

 Ultimately it is down to the person doing the fitting to identify if the tube is over size. In this effect it is infinitely better to have a slightly undersize tube which will expand to fit the tyre instead of oversize and no where for the slack to go. Thank God we are not talking certified aircraft.!  

Regards  

Bob Harrison G-PTAG  

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Jim Brown

 Sent: 21 September 2009 20:42

 To: europa-list(at)matronics.com

 Subject: RE: Europa-List: Mono Inner Tyre Failures  

Bob;   

We had the same problem on our RV-7A that our son   flys.It went flat after he had landed...   

No damage, but we also went to different size on the   nose gear tube....   

JimBrown

   --- On Sun, 9/20/09, Robert C Harrison <ptag.dev(at)tiscali.co.uk>   wrote:   

    	  Quote: 	

   From: Robert C Harrison <ptag.dev(at)tiscali.co.uk>

   Subject: RE: Europa-List: Mono   Inner Tyre   Failures

   To: europa-list(at)matronics.com

   Date: Sunday, September 20, 2009, 9:43 PM         

Hi! Jim    

I have had the problem with failure of the nose wheel inner tubes   at their seams. Especially before I researched slightly different size tubes.   The originals were too large a diameter on the “balloon”   dimension and so always inflated with a crease in them.   

Regards   	

Bob Harrison G-PTAG   

From: owner-europa-list-server(at)matronics.com   [mailto: owner-europa-list-server(at)matronics.com   ] On Behalf Of Jim Brown

   Sent: 20 September 2009 13:11

   To: europa-list(at)matronics.com

   Subject: Re: Europa -List: Mono Inner Tyre Failures   

Paul     

I     have been following this thread on flats, and I have a few points to     make, that have worked for me.     

I     have been flying my monowheel almost ten years off paved runway's...My kit     included the old "tundra tire" and instructions to use low     pressure,(I don't remember PSI, but the sidewalls rubbed the Landing gear     frame.) The plane taxied like it was runing in mud..     

I     changed that tire at about 20 hours to a 700 X 6 and 6 plys and used 30     PSI. The plane is much easier to taxi, take off's are much quicker, and in     800 hours I have replaced two tires that were worn out. No flats !!!! I     can't say that the air pressure is the problem, and also I don't fly off     grass, but I have not had the problems that so many of you are having.     

On     another note having made the above change I also changed the outrigger     lengths, as the new tire, with higher pressure made the original outriggers     to short. Over the past ten years I have extened the outriggers in length,     to now when the plane is parked, both outriggers touch the ground. For me     ground handling is much better, and in landing with the longer outriggers     the "rocking from one outrigger to the other" is now gone.     

Also     another question ? Are the flats limited to the Monowheels ??? Are are     the tri gears having this problem?      

Jim     Brown     

XS     Monowheel.

     --- On Thu, 9/17/09, Paul McAllister < paul.the.aviator(at)gmail.com     > wrote:     

      	  Quote: 	

     From: Paul McAllister < paul.the.aviator(at)gmail.com     >

     Subject: Re: Europa -List: Mono     Inner Tyre     Failures

     To: europa-list(at)matronics.com

     Date: Thursday, September 17, 2009, 12:32 PM     	

--> Europa -List message posted by: Paul McAllister     <paul.the.aviator(at)gmail.com>

     Hi,

     I have this happen regularly.  I now just change them every 100 hours

     and I never travel without my jacking block and a spare inner tube.  I

     have tried inner tube talcum powder and different pressures with out

     much improvement.

     The failure mode seems to be chafing on the side wall due to running

     such  low pressure.

     Paul

     On Thu, Sep 17, 2009 at 5:02 AM, Raimo Toivio <raimo.toivio(at)rwm.fi>     wrote:

     > All

     >

     > I have lost without visible or known reason two innner tyres in my

     > Monowheel.

     >

     > Loosing suddenly main gear´s air pressure is not a funny game and did     not

     &gtom/Navigator? Europa     -List" target=_blank>http://www.matronics.com/Navigatosp;                  - MATRONICS WEB FO/" ;                   -Matt Dralle, List     Admin==========     <![if !supportLineBreakNewLine]>     <![endif]>     

     	  Quote: 	
		                - The Europa -List Email Forum ---> http://www.matronics.com/Navigator?Europa-List               - MATRONICS WEB FORUMS -             - List Contribution Web Site -                              -Matt Dralle, List Admin.     	
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