Bolt Wear on Main Tire

Submitted by Anonymous on

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From: Alan R. Crawford <alan [at] tstar.net>
Sender: <marv [at] lancaironline.net>
Subject: Bolt Wear on Main Tire
Date: Wed, 27 Aug 2014 20:32:31 -0400
To: <lml [at] lancaironline.net>


Has anyone had problems with one of the four bolts on the main gear wearing into the rubber tread of the tire? It has not loosened any and is the same distance as all the other bolts, not only on the gear with the problem but also the other gear as well???  It has worn only a little bit – not deeper than the tread?

 

For the life of me I cannot figure out why this is happening???  

 

Blue Skies

Alan

Race 21

 

Life is NOT a Journey to the grave with the Intention of arriving safely

In a Pretty and Well Preserved Body, BUT rather to skid in broadside,

         Thoroughly used up, Totally Worn Out, and Proclaiming

                               “WOW, WHAT A RIDE!!!”

 


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Bolt Wear on Main Tire

Submitted by Anonymous on

From: Dan Ballin <dballin [at] gmail.com>
Sender: <marv [at] lancaironline.net>
Subject: Re: [LML] Bolt Wear on Main Tire
Date: Thu, 28 Aug 2014 07:26:27 -0400
To: <lml [at] lancaironline.net>
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Undecoded Message
I can't find the reference, but Lancair had an alternative way to mount the wheel on the fork using flush countersunk screws on the tire side.    Gives you more clearance than the bolt heat and is easy to do.  The other issue is whether the fork has "bent" reducing clearance.


Dan Ballin




On Wed, Aug 27, 2014 at 5:32 PM, Alan R. Crawford <alan [at] tstar.net

> wrote:

Has anyone had problems with one of the four bolts on the main gear wearing into the rubber tread of the tire? It has not loosened any and is the same distance as all the other bolts, not only on the gear with the problem but also the other gear as well???  It has worn only a little bit – not deeper than the tread?

 

For the life of me I cannot figure out why this is happening???  

 

Blue Skies

Alan

Race 21

 

Life is NOT a Journey to the grave with the Intention of arriving safely

In a Pretty and Well Preserved Body, BUT rather to skid in broadside,

         Thoroughly used up, Totally Worn Out, and Proclaiming

                               “WOW, WHAT A RIDE!!!”

 



Image


image001.jpg

Bolt Wear on Main Tire

Submitted by Anonymous on

From: John Smith <john [at] jjts.net.au>
Sender: <marv [at] lancaironline.net>
Subject: Re: [LML] Re: Bolt Wear on Main Tire
Date: Thu, 28 Aug 2014 21:55:26 -0400
To: <lml [at] lancaironline.net>
Message Header


Undecoded Message
Yes – I have had this issue since “day 1” with Lancair standard stock kit supply alloy forks and tyres in 2008.

They do offer an exchange I believe for steel forks which are stiffer, but of course heavier (can’t recall the pricing). But Lancair did kindly provide me with a “kit” as Dan refers to which comprises a set of AN4 countersink bolts.  I have’t yet fitted these as, at about the time I received this “kit”, I had to change my main gear tyres anyway – Gary Weeks recommended Goodyear Flight Custom III tyres as they have a slightly different profile compared to the Michelins supplied by Lancair and that they offer better clearance. Gary’s Legacy has steel forks and the clearance is fine; but with my alloy forks, whilst there is 10-12mm clearance under static conditions now, I do occasionally get some rubber material deposited on the gear doors indicating that the tyres do still touch on occasions - but it is MUCH better.  Fitting the counter sink bolt set would in combination with Custom III tyres fix it completely – I think.

BTW – when it comes to machining the countersink profiles – I’ve been advised that the countersinks would have to be "perfect" to avoid any possibility of creating serious stress in the screws due to any eccentric loading – so the forks have to be properly milled on a heavy duty milling machine. So, I wouldn’t attempt to do it “by hand”.




Regards,



John

John N G Smith

Tel / fax:    +61-8-9385-8891

Mobile:      +61-409-372-975

Email:         john [at] jjts.net.au