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Main Gear Attachment Nut Torque...?

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PatrickW

Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas

Posted: Fri Dec 05, 2008 5:47 pm Post subject: Main Gear Attachment Nut Torque...?

Does anyone know the correct torque value for the AN365-820 fiber lock nuts on the 1/2" Grade 8 bolts on the Main Gear Attachment bracket 6B11-4...?



AC43.13-1B gives values on page 7-9, however I believe these values are for "metal against metal".  In the case of the Main Gear Attachment, we have "Metal against Rubber".



What have other builders done...?



- Pat

PS - The drawings specify that these nuts can be used, and the farm boy in me thinks that the fiber nut is better than the castle nut because a bolt WITHOUT a hole in it is going to be stronger than a bolt WITH a hole in it.  But the torque question is still valid in any case.

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GLJSOJ1

Joined: 18 Aug 2007
Posts: 82
Location: Chesapeake, Virginia

Posted: Sat Dec 06, 2008 6:35 pm Post subject: Re: Main Gear Attachment Nut Torque...?

I did mine at 35 ft# and used the castle nuts.  It did distort the extrusion some, but they are tight.  There have been other post on this subject so might want to check the archives also.

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PatrickW

Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas

Posted: Sat Dec 06, 2008 6:57 pm Post subject: Re: Main Gear Attachment Nut Torque...?

There was some discussion on this topic here:

http://forums.matronics.com/viewtopic.php?t=52550&highlight=6b114



Since fiber lock nuts (as well as castle nuts) are specified on the plans, that's what I'll go with, along with "witness paint" to aid in future preflight inspections.



I torqued them up to 35 ft-lbs for now.  It felt like more would be too much.  My original target torque was around 48 ft-lbs based on the average AC43 value converted to ft-lbs, assuming I read the chart correctly and assuming that it's applicable to Grade 8 bolts, which it may not be.



Today my XL is standing on it's own gear for the first time.  



- Pat

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craig(at)craigandjean.com
Guest

Posted: Sat Dec 06, 2008 9:05 pm Post subject: Main Gear Attachment Nut Torque...?

Here is a quote from a post by Jeff (Afterfxllc(at)aol.com) from Dec 3rd,

2007 (message #51120) in a thread titled "XL Landing gear nuts Torque":



"Talked to zenith today and asked if we torque the landing gear nut to the

specs or just snug and they said it can be torque to specs but good and

tight is fine also. I told them I would tighten mine down until the angle

just started to  bend and give them the torque and they said they would post

it in the updates. It's funny how so many have been built and the question

has never come"



-- Craig



--

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maarten versteeg

Joined: 15 May 2007
Posts: 37
Location: San Antonio

Posted: Mon Dec 08, 2008 12:08 pm Post subject: Main Gear Attachment Nut Torque...?

Hello Patric,



Sorry, I don't know the answer on your question. But concerning your

argument that a fiber nut is better because a bolt without a hole is

stronger then a bolt with a hole. I would agree that a bolt without a hole

is stronger than a bolt with a hole, but I also think that the hole only

affects the part of the bolt that doesn't matter. The hole in the bolt is

below the grip range of the bolt, so the load on the hole is only the

cotter pin.



Regards,

    Maarten

601 XL, plans building, all aerodynamic surfaces done



 	  Quote: 	
		   Time: 05:47:58 PM PST US

 Subject: Main Gear Attachment Nut Torque...?

 From: "PatrickW" <pwhoyt(at)yahoo.com>

 Does anyone know the correct torque value for the AN365-820 fiber lock nuts on

 the 1/2" Grade 8 bolts on the Main Gear Attachment bracket 6B11-4...?



 AC43.13-1B gives values on page 7-9, however I believe these values are for "metal

 against metal".  In the case of the Main Gear Attachment, we have "Metal against

 Rubber".



 What have other builders done...?



 - Pat

 PS - The drawings specify that these nuts can be used, and the farm boy in me thinks

 that the fiber nut is better than the castle nut because a bolt WITHOUT

 a hole in it is going to be stronger than a bolt WITH a hole in it.  But the torque

 question is still valid in any case.

- The Matronics Zenith601-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Maarten Versteeg
601XL scratch building wings

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