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Center wing spar question

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bryanmmartin(at)comcast.n
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Posted: Sat Dec 31, 2005 10:20 pm Post subject: Center wing spar question



It is my understanding that the the center and outer segments of the wing

spar of the XL are assembled in a jig and the holes are drilled through both

parts at the same time. The holes drilled on the left side may not be

aligned the same as the holes on the right side but when all three segments

are bolted together both outer wing spars should be at the same angle. You

can test this out by putting the three sections of the spar together and

measuring the dihedral angle on both sides. The holes drilled on the left

side of the center wing spar section should match up with the holes on the

left outer spar section and the same match up should exist on the right

side.

As I recall, I ran into the same situation as you, drilling the wing jigs

according to the dimensions on the plans resulted in the holes in the wing

jigs not lining up with the holes already drilled in the center spar

section. The left side and the right side hole patterns were different. I

ended up using a file to oval out some of the holes in the jigs to make them

fit. After I made my adjustments, the jigs worked out just fine. The

"dihedral angle" of the wing jigs in not very important anyway. The

important thing is the fore-aft angles of the spar center section and the

rear frame. This is what the wing jigs are designed to establish.

To make the wing jigs, the holes need to be match drilled with the holes

already drilled in the spar center section. The hole locations shown in the

plans are the "nominal" locations, the actual locations will be a bit

different. This point apparently is not made clear in the plans. If you

check the list archives, I think you will find a discussion of this subject

that took place a couple of years ago.

--

Bryan Martin

N61BM, CH 601 XL, Stratus Subaru.

on 12/31/05 5:52 PM, Randy at rpf(at)wi.rr.com wrote:

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carlosfsa(at)yahoo.com
Guest

Posted: Sun Jan 01, 2006 8:38 am Post subject: Center wing spar question



Bryan, are you keeping the oval hole?

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billn(at)velocity.net
Guest

Posted: Sun Jan 01, 2006 9:38 am Post subject: Center wing spar question



I knew it- proof of another pandemic! Internationally transmitted,

targets homebuilders, a form of the "Bird" flu- "Extra hole syndrome".

Good luck to all in '06.......

Bill

do not archive

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bryanmmartin(at)comcast.n
Guest

Posted: Sun Jan 01, 2006 2:42 pm Post subject: Center wing spar question



The oval holes are in the wing jigs not in any part of the finished

airframe. I have since disassembled and disposed of the wing jigs as they

are no longer needed after the fuselage is complete.

on 1/1/06 11:38 AM, Carlos Sa at carlosfsa(at)yahoo.com wrote:

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ashontz

Joined: 27 Dec 2006
Posts: 723

Posted: Wed Dec 27, 2006 11:26 am Post subject: Re: Center wing spar question

 	  carlosfsa(at)yahoo.com wrote: 	
		  

Bryan, are you keeping the oval hole? 	




That's what I was going to say. Doesn't matter if it's in a jig or the spar. The holes should be PERFECTLY aligned (by jigging the center spar to a wing spar and drilling through both and then reaming through both).

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