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[jabiruengines] A new thread for Jabiru, tires?

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imap8ntr(at)cox.net
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Posted: Thu Feb 05, 2009 2:18 pm Post subject: [jabiruengines] A new thread for Jabiru, tires?

Jabiru pilots

 Since tires are paramount for  aircraft safety even before getting off the ground,  I thought I would  bring up this issue (maybe for a light change.)

 My J-250 calls for main tires of  500 x 5.  When I got the aircraft it came with 4 ply.  I wonder if the  500 x 5 tires, 6 ply would be better.  They obviously are rated for more  static and breaking load.  They are the same dimensions and weight as the  original 4 ply and for the same price.

  

 It seems intuitive that the 6 ply  would be better.  I do not know if an aircraft can specifically be designed  to only use the 4 ply and no more,  even given the above data.   Incidently the "5" is the rim size but what is the "500?"  It certainly is  too big a number for the wheel diameter or tread width?  Any  ideas?

  

 Ivan

 USA

  

 [quote]   ---

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Thu Feb 05, 2009 2:46 pm Post subject: [jabiruengines] A new thread for Jabiru, tires?

That number probably refers to the width of the tire at the widest  

point, or the width of the rim between the flanges. Are you sure  

there isn't a decimal point after the 5......as in 5.00 x 5?

Maybe the manufacturer of the airplane, Jabiru in this case, had a  

bit of "springing" in mind with the original 4-ply tires, and going  

to the 6-ply would transfer more shock to the landing gear...just a  

thought. Sometimes these decisions are made as a compromise, and when  

we experimentalists change things, we introduce other factors that  

upset the apple cart.



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 605 hrs

Sensenich 62x46

Electroair direct-fire ignition system

New skis done and flying





On Feb 5, 2009, at 5:17 PM, Ivan wrote:



 	  Quote: 	
		   Jabiru pilots

 Since tires are paramount for aircraft safety even before getting  

 off the ground,  I thought I would bring up this issue (maybe for a  

 light change.)

 My J-250 calls for main tires of 500 x 5.  When I got the aircraft  

 it came with 4 ply.  I wonder if the 500 x 5 tires, 6 ply would be  

 better.  They obviously are rated for more static and breaking  

 load.  They are the same dimensions and weight as the original 4  

 ply and for the same price.



 It seems intuitive that the 6 ply would be better.  I do not know  

 if an aircraft can specifically be designed to only use the 4 ply  

 and no more,  even given the above data.  Incidently the "5" is the  

 rim size but what is the "500?"  It certainly is too big a number  

 for the wheel diameter or tread width?  Any ideas?



 Ivan

 USA

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

imap8ntr(at)cox.net
Guest

Posted: Thu Feb 05, 2009 3:27 pm Post subject: [jabiruengines] A new thread for Jabiru, tires?

That is true,  I would certainly like to hear from Pete regarding if they 

had some specific reason why to use 4 ply instead of 6 ply.  Good thought 

about the springing of the tires, who knows.  That is why I always default 

to the manufacturer since they have many intricate reasons for doing things 

which our "experimenting" mentality always tries to fix without maybe 

knowing all the details.

The 500 has no decimal point and 500 x 5 is exactly as it is listed with a 

few aviation tire manufacturers.  I just cant fit 500 into anything.



Thanks

Ivan

---

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Sat Feb 07, 2009 4:47 pm Post subject: Re: [jabiruengines] A new thread for Jabiru, tires?

The 6 ply over the 4 ply is fine. It won't make any difference other than you'll have 2 more plys in the tire. You won't be able to tell the difference in the planes handling or anything else. My nose wheel had a 2 ply from the factory and I went with the Desser LSA 6 ply tire (5.00-5). It says it is a tubeless tire, but after talking to Desser, I just put a tube in like everyone else. Never looked back. It just has a better load rating and a little less sidewall flex between the 4 and the 6. I run 27-29 psi in the front. I have 6.00-6 for mains. That tire I run the Desser "Monster Tread" tire like a lot of my friends. I also used the Monster tread on my last plane after a couple of flats. Best money I ever spent and it's not expensive.

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Roger Lee
Tucson, Az.
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Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

imap8ntr(at)cox.net
Guest

Posted: Sat Feb 07, 2009 8:07 pm Post subject: [jabiruengines] A new thread for Jabiru, tires?

Thanks Roger.

I have about 900 landings on my nosewheel and about 700 on my mains (300 on 

the inner and 400 on the outer edges)  I am a new pilot so I think these 

tubed Air Hawks are doing me fine.  Of course these landings have been 

almost entirely on asphalt runways.



I am still wondering if 5.00-5 and 500-5 on the mains is the same tire size? 

I just have replaced the tires with what size the old ones are labelled.



Ivan

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wypaul

Joined: 08 Jun 2007
Posts: 24

Posted: Tue Feb 10, 2009 7:12 am Post subject: Re: [jabiruengines] A new thread for Jabiru, tires?

Ivan,



500-5 and 5.00-5 should be the same tire.  The 500 or 5.00 is 5 inches thru the widest part of the sidewall, where the sidewall bulges.  You will hear the tire refered to as a five hundred by five either way it is written. 



Paul

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Paul Spackman
Q-2 Jabiru 3300

imap8ntr(at)cox.net
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Posted: Tue Feb 10, 2009 8:36 am Post subject: [jabiruengines] A new thread for Jabiru, tires?

Thanks

Ivan



---

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