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MATCO Wheels

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mark(at)flylightning.net
Guest

Posted: Mon Mar 14, 2011 9:14 am Post subject: MATCO Wheels

There seems to be a lot being said right now about the MATCO wheels that are

supplied with the Lightning kit.



Regarding the wheel half through bolts (MATCO part number: SHCS .25 - 20 x

1.25 SHCS), we have had three instances, four now with Selwyn, that I know

of where the through bolt has broken. After we experienced it with our own

factory demonstrator (instance #2) I contacted George Happ, owner of MATCO,

and discussed it with him. He was quite certain that it was a case of over

or under torque on the nut. I learned from George that as a wheel rotates

the stresses on the bolt are greater or lesser depending at which point the

wheel is in it's 360 degrees of rotation. You may have already known that

but I did not and found it very interesting. That is why he stresses correct

torque of the nut. The correct torque value for this nut per MATCO is 45.6

INCH pounds. This torque value is readily available on MATCO's website

under: Technical Support > Technical Manuals and Service Bulletins > General

Wheel and Brake Information. As you can imagine 45.6 INCH pounds is not a

whole lot of torque and it would be very easy to over torque these bolts if

not done properly with a calibrated torque wrench. Ever since we started

ensuring all of our wheels were assembled using the correct torque values we

have not experience another through bolt failure.



Regarding the bolts holding the brake discs to the wheel. As Selwyn stated

Buz included MATCO Service Bulletin SVC062410 that addressed the problem

with the early use of the Nord lock washers. I just want to make clear that

on the next page of the newsletter (pg 42) there is a note from me to Buz

with a clarification to the Service Bulletin. It states: "A bit of

clarification for the SB. The SB is mandatory for any customer that has the

Nord-Lock washer with button head screws. If a customer has Allen head cap

screws that are safety wired to the disc AND they have not experienced any

problems in the past then they DO NOT have to comply with this SB. If a

customer with Allen head cap screws has had problems in the past (I know of

a couple) then they can contact MATCO and take advantage of the SB." That

was written by me June of last year.



Selwyn says he assembled his wheels correctly and I take him at his word.

With that being said I have no other explanation why his through bolt broke.

My suggestion is to contact George at MATCO and see what his thoughts are on

the matter. I believe that MATCO manufactures a quality product and when

they have found an issue, i.e. the SB, they have worked with us to solve the

problem.



Best regards,



Mark



Mark Stauffer

Production Manager

Arion Aircraft

2842 Hwy 231 North

Shelbyville, TN 37160

(931) 680-1781

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EAFerguson(at)AOL.COM
Guest

Posted: Mon Mar 14, 2011 5:40 pm Post subject: MATCO Wheels

In a message dated 3/14/2011 1:14:40 P.M. Eastern Daylight Time,  mark(at)flylightning.net writes:

  	  Quote: 	
		  SHCS .25    - 20 x

1.25 SHCS 	


 

 Mark et al. Please translate the SHCS code. Is this a bolt grade? Is it an  AN bolt? The listed torque sounds low for a 1/4" bolt.

  

 BTW, I have had no problems with mine at 350 hours and 4 tire changes, but  I think next annual I might change them for new and of course use the torque  wrench to tighten. 

  

 Earl

  [quote][b]

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davemcc

Joined: 28 Feb 2007
Posts: 74

Posted: Mon Mar 14, 2011 6:37 pm Post subject: MATCO Wheels

I have 700 hrs and 4 tire changes and should also start the torque wrench  thing.  These guys should have had Esqual brakes and rims.  Matco has  been the greatest and George is so cool and DIRECT on how to fix it.

 My thought is how bad are their landings

 Esqual 167DM

 Dave

 [quote]   ---

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N1BZRich(at)AOL.COM
Guest

Posted: Mon Mar 14, 2011 8:13 pm Post subject: MATCO Wheels

720 + hours on my highly modified Esqual with lots of Lightning parts  (including the wheels and brakes) and I think three tire changes so  far.  I reversed the tires on the mains at 200 to 250 hours and then put on  new tires at 500 hours.  Just recently at the annual (about 720 hours) I  reversed the tires again.  The reason for reversing the tires on the mains  is to equalize the tire wear caused by some toe in.  The outside edges wear  faster than the insides.  Without doing this I couldn't get 500 hours on a  set of main gear tires.  Up until the recent annual I had not used a torque  wrench, but didn't really cramp down on the wheel bolts.  Also, my wheels  have the older safety wired screws to hold the brake disk on - no problems here  either.

  

 Blue Skies,

 Buz

  

  In a message dated 3/14/2011 10:37:28 P.M. Eastern Daylight Time,  corky(at)hbci.com writes:

 [quote]   I have 700 hrs and 4 tire changes and should also start the torque wrench    thing.  These guys should have had Esqual brakes and rims.  Matco    has been the greatest and George is so cool and DIRECT on how to fix it.

   My thought is how bad are their landings

   Esqual 167DM

   Dave

   [quote]     ---

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mark(at)flylightning.net
Guest

Posted: Tue Mar 15, 2011 4:36 am Post subject: MATCO Wheels

This is a part number that MATCO came up  with. It means: Socket Head Cap Screw 1/4" x 20 pitch threads x 1.25" long. It  does not delineate a hardness of the bolt, you'll have to call MATCO for that  information.

  

 Hope this helps!

  

 Best regards,

  

 Mark

 [quote]   --

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