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Centre spar bolt problem

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gandkwalsh(at)gmail.com
Guest

Posted: Sun Aug 24, 2008 1:36 am Post subject: Centre spar bolt problem

Hi

I'm plans building a 601XL and am new to the list but need some info on 

the 6 AN4-15A spar bolts in plan 6W4 (issue 10/04).  I find the bolt 

grip length with the 2 required washers to be about 0.5mm too long.  It 

is satisfactory if a further washer is added under the bolt head but 

with only 2 washers the nut can tighten onto the grip without properly 

holding the spar together.  Has any other plans builder had this problem 

and is another washer ok?



Greg Walsh

Plans 6868

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psm(at)att.net
Guest

Posted: Sun Aug 24, 2008 3:43 am Post subject: Centre spar bolt problem

Hi Greg,



I'm a kit builder, but I think the issue you raise applies to all 

versions of the XL.



The plans are not the final authority on bolt selection for any part 

of the plane.  This is especially true in the main spar attach 

section since the two outer bolts on each wing must go through the 

uprights and the 4 inner bolts do not.



I think the best way to deal with the bolt length question is to use 

what ever bolt length gives you the correct joint -- without regard 

for the plans specification.  In case of the wing attach bolts, this 

means you will probably need 8 of one length and 4 of a longer 

length.  If your particular plane winds up using a different 

arrangement of bolts then that is fine.



Even for kit builders, purchasing additional AN bolts is very 

easy.  I get mine from Aircraft Spruce, but there are several other 

fine suppliers of these parts.  They are not very expensive, so 

having a few extra left over is not a big deal.  It pays each builder 

- even kit builders - to learn the proper designation for each type 

of bolt.  The biggest issue is the designation for drilling the bolts 

for safety wire or cotter pins.  For a bolt with no drilled holes the 

"A" designation is required.



Good luck,



Paul

XL getting close

At 02:33 AM 8/24/2008, you wrote:

 	  Quote: 	
		  Hi

I'm plans building a 601XL and am new to the list but need some info 

on the 6 AN4-15A spar bolts in plan 6W4 (issue 10/04).  I find the 

bolt grip length with the 2 required washers to be about 0.5mm too 

long.  It is satisfactory if a further washer is added under the 

bolt head but with only 2 washers the nut can tighten onto the grip 

without properly holding the spar together.  Has any other plans 

builder had this problem and is another washer ok?



Greg Walsh

Plans 6868

- The Matronics Zenith-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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planes_by_ken(at)bellsout
Guest

Posted: Sun Aug 24, 2008 9:50 am Post subject: Centre spar bolt problem

In this application, I would want the shank (unthreaded portion) to go 

all the way through the spar.  And a little shank sticking out.  Add 

washers as necessary.  Be SURE that the nut torques against the washers 

and does not bottom on the shank.

Ken Lilja



Greg wrote:

 	  Quote: 	
		   



 Hi

 I'm plans building a 601XL and am new to the list but need some info 

 on the 6 AN4-15A spar bolts in plan 6W4 (issue 10/04).  I find the 

 bolt grip length with the 2 required washers to be about 0.5mm too 

 long.  It is satisfactory if a further washer is added under the bolt 

 head but with only 2 washers the nut can tighten onto the grip without 

 properly holding the spar together.  Has any other plans builder had 

 this problem and is another washer ok?



 Greg Walsh

 Plans 6868

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Sun Aug 24, 2008 1:04 pm Post subject: Centre spar bolt problem

Three washers is acceptable, I believe four is the maximum allowable. As I recall, I used three washers on the eight inboard bolts but only two on the four outboard bolts that go through the uprights. The extra washers were installed under the bolt heads.

[quote]

 [quote][b]

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

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