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601XL Wing Spar Jig Question

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lwhitlow

Joined: 15 Jan 2006
Posts: 76
Location: Valparaiso Indiana

Posted: Fri Nov 23, 2007 12:01 pm Post subject: 601XL Wing Spar Jig Question

I'm stumped and the drawings /photo guide aren't as clear to me as I would like.SOOOOOOO  Here's the question



Page 5 of the photo guide WING JIG REF 6-B-14



I'm trying to drill the holes in the spar insert but I'm not quite sure where they go



Looking at the little drawing in the upper Right of page 5 I see that one of the holes is 132mm from the extrusion  Is this the bottom hole or the top??  



Once I establish that I can use the Pic at the bottom to find the other hole



And then the second question is  After I get done building this jig, When is it used?? I see no other mention of it in the photo guide after you make it??



Or do you just use it to check the spar to rear channel distance as you go along



Thanks



Larry Whitlow

601XL/Jabiru 3300 50% done 80% to go, Engine due in February 



One of the last kits before the CNC kits started coming out

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psm(at)ATT.NET
Guest

Posted: Fri Nov 23, 2007 7:53 pm Post subject: 601XL Wing Spar Jig Question

Hi Larry,



The wing jigs are used to fix the location of the rear wing attach 

points.  They also play a roll in getting the spar carry-through 

fixed at the correct angle to the longerons.  They need to be made to 

match the actual distance on your wings.  It doesn't really matter 

too much where the holes are drilled.  You just need to make sure the 

front part fits in same place the wing spars will eventually go into 

the spar carry-through.  The jig can stick out nearly any distance 

from the carry-through so long as the rear feature still makes 

contact with the rear wing attach point.  You can wait to drill the 

holes in the main spar part until you actually need to use the 

jig.  Then it will all be a lot more clear.



I hope that helps.  If it is still not clear, please ask more 

questions.  This is a critical part of building your plane - making 

the wings fit the fuselage.



Paul

XL fuselage

At 12:01 PM 11/23/2007, you wrote:

 	  Quote: 	
		  



I'm stumped and the drawings /photo guide aren't as clear to me as I 

would like.SOOOOOOO  Here's the question



Page 5 of the photo guide WING JIG REF 6-B-14



I'm trying to drill the holes in the spar insert but I'm not quite 

sure where they go



Looking at the little drawing in the upper Right of page 5 I that 

one of the holes is 132mm from the extrusion  Is this the bottom 

hole or the top??



Once I establish that I can use the Pic at the bottom to find the other hole



And then the second question is  After I get done building this jig, 

When is it used?? I see no other mention of it in the photo guide 

after you make it??



Or do you just use it to check the spar to rear channel distance as 

you go along



Thanks



Larry Whitlow

601XL/Jabiru 3300 50% done 80% to go, Engine due in February

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lwhitlow

Joined: 15 Jan 2006
Posts: 76
Location: Valparaiso Indiana

Posted: Fri Nov 23, 2007 8:20 pm Post subject: Re: 601XL Wing Spar Jig Question

I think I'm starting to get it now ''

Dihedral isn't really critical as far as the wing jig goes.  If I'm understanding it right, the jig's primary purpose is to set the distance from the center spar carry thru to the rear channel. thats why there is a jig for both sides, so they can be used together, Right???



Man this is a lot of heavy metal for a simple jig. I wonder why Zac didn't just go ahead and drill the holes in the spar jig when they drilled the center and the main spar already as part of the kit?

Thanks Paul

Larry



 	  psm(at)ATT.NET wrote: 	
		  Hi Larry,



The wing jigs are used to fix the location of the rear wing attach 

points.  They also play a roll in getting the spar carry-through 

fixed at the correct angle to the longerons.  They need to be made to 

match the actual distance on your wings.  It doesn't really matter 

too much where the holes are drilled.  You just need to make sure the 

front part fits in same place the wing spars will eventually go into 

the spar carry-through.  The jig can stick out nearly any distance 

from the carry-through so long as the rear feature still makes 

contact with the rear wing attach point.  You can wait to drill the 

holes in the main spar part until you actually need to use the 

jig.  Then it will all be a lot more clear.



I hope that helps.  If it is still not clear, please ask more 

questions.  This is a critical part of building your plane - making 

the wings fit the fuselage.



Paul

XL fuselage

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psm(at)att.net
Guest

Posted: Fri Nov 23, 2007 8:43 pm Post subject: 601XL Wing Spar Jig Question

Hi Larry,



Yes, Dihedral doesn't matter at all for the wing jig.  The dihedral 

is set by the relationship between the actual wing spars and the spar 

carry-through.  For kit builders, this is set at the factory.  For 

scratch builders (and wing replacers like me) the dihedral is set 

when the holes are drilled in the main spars.



I think the reason there are two jigs relates to the fact that you 

can't use one jig for both wings.  There is a mirror image taking 

place.  Also, the wing jigs should be made to exactly match your 

wings which may or may not be exactly the same as the drawings and/or 

each other.



I don't know the answer to the question of why ZAC does or does not 

drill the jig parts.  I think the parts are actually mostly scrap 

from the real spar construction.  Besides, it really doesn't matter 

where the holes are drilled.  It only matters that the distance 

between the front and back parts is correct.  It may also be 

important that the angles of those parts accurately match the wings.



Paul

XL fuselage

At 08:20 PM 11/23/2007, you wrote:



 	  Quote: 	
		  I think I'm starting to get it now '[Idea]'

Dihedral isn't really critical as far as the wing jig goes.  If I'm 

understanding it right, the jig's primary purpose is to set the 

distance from the center spar carry thru to the rear channel. thats 

why there is a jig for both sides, so they can be used together, Right???



Man this is a lot of heavy metal for a simple jig. I wonder why Zac 

didn't just go ahead and drill the holes in the spar jig when they 

drilled the center and the main spar already as part of the kit?

Thanks Paul

Larry

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davgray(at)sbcglobal.net
Guest

Posted: Sat Nov 24, 2007 3:45 am Post subject: 601XL Wing Spar Jig Question

Larry



I don't have my plans handy for the actual measurements.



The wing jig establishes the angle and distance between the tilted front

spar carry thru and the tilted rear spar carry thru.



I believe the hole placement is important since the dihedral and the tilt of

the spar carry thru will affect the geometry of the fit.  This effect can

also be seen in the forward sweep of the wing tips after your wings are on.



Be sure that after you make the right and left jigs that they match up

perfectly when standing next to each other face to face.  They are right &

left handed as are the wings.  If not something is wrong.  My first attempt

was off due to a slightly bad measurement and they did not match by more

than 1 inch which would have messed up my wing attachment later.

Due to storage space my wings were never matched to the fuselage until

attachment at the hanger.  With accurate jigs I did not run into any

surprises.  This was an item of concern.  I did take the jigs to the wings,

which were built before the fuselage, to measure and compare but it is

another of the mirror image problems when measuring.

It is possible to confirm the future fit.



Gary Ray, 601XL,  58 TT

---

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lwhitlow

Joined: 15 Jan 2006
Posts: 76
Location: Valparaiso Indiana

Posted: Sat Nov 24, 2007 11:02 am Post subject: Re: 601XL Wing Spar Jig Question

Gary



After  a little sleep and your's and Paul's notes, things have become much clearer. Combined with READING THE RIGHT PAGE OF THE PLANS  !!!!!!!



It seems in my stupor, I never looked at  6-B-13 which clearly shows the location of the holes. I was only looking at 6-B-14 and the Photo guide.



I feel pretty silly but thanks to you guys and the list, I have once again avoided the dreaded STUPIDITY SYNDROME ( tm ) 

Now back to my other hobby Nuclear Physics where accuracy is not as necessary 



Thanks Guys 



Larry

 	  davgray(at)sbcglobal.net wrote: 	
		  Larry



I don't have my plans handy for the actual measurements.



The wing jig establishes the angle and distance between the tilted front

spar carry thru and the tilted rear spar carry thru.



I believe the hole placement is important since the dihedral and the tilt of

the spar carry thru will affect the geometry of the fit.  This effect can

also be seen in the forward sweep of the wing tips after your wings are on.



Be sure that after you make the right and left jigs that they match up

perfectly when standing next to each other face to face.  They are right &

left handed as are the wings.  If not something is wrong.  My first attempt

was off due to a slightly bad measurement and they did not match by more

than 1 inch which would have messed up my wing attachment later.

Due to storage space my wings were never matched to the fuselage until

attachment at the hanger.  With accurate jigs I did not run into any

surprises.  This was an item of concern.  I did take the jigs to the wings,

which were built before the fuselage, to measure and compare but it is

another of the mirror image problems when measuring.

It is possible to confirm the future fit.



Gary Ray, 601XL,  58 TT

---

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