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wing mating

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dhall(at)donka.net
Guest

Posted: Sat Aug 04, 2007 1:06 pm Post subject: wing mating

Having some doubt on getting the wings aligned.



I've got the wings in place with drift pins.  

- i carefully leveled the fuse, longitudally and laterally.

- I suspended 3 plumb bobs each wing, out/mid/in.

- I stretched a line between the outboard bobs.  The other 4 bobs were

behind the line.  Suggests forward sweep.

- I restretched the line between the inboard bobs.  The outboard bobs

were about 1/8-1/4" forward. Also suggests forward sweep.

This suggests I have forward sweep.  



The problem is that I can't nudge the wings to take out the sweep.  I

have two issues:

 a) The rear spar is snug against the fuse, mostly interfering with the

round head rivet just above the attach point.

 b) The flap is already very snug to the fuse.  



In order to take as much as 1/4" sweep out, I calculated that I need

between 1/16" and 1/32" movement on the rear spar.  Minor trimming

around the rivet and the inside edge of the spar would give me the

movement I need, but the flap fit is already so snug, nearly perfect, so

there's doubt. If I move the wing to take out fwd sweep, It looks like

I'll have to do some minor reshaping of the flap to avoid interference

with the fuse.



Questions:

- Anybody else find similar rivet or flap interference?

- Is it normal to have to tweak the flap fit along the fuse?

- Should I also be concerned about having to trim the rear spar? 

Thought I was precise on the original cut, but I guess I could have been

off by a hair.  



Man, it was a bear to get the wings in.  I don't relish the thought of

taking them in/out for trimming and tweaking... 



Don

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rv8a2001(at)yahoo.com
Guest

Posted: Sat Aug 04, 2007 2:16 pm Post subject: wing mating

Install the wings with out the flaps and then trim the flaps to fit.......Worked great for me.......what do the instructions say?

  

 Also a picture is worth a thousand words, and its been a few years so I dont remember any rivet problems.

 

 

Scott Bilinski

RV-8a 

  



  



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fvalarm(at)rapidnet.net
Guest

Posted: Sat Aug 04, 2007 4:24 pm Post subject: wing mating

Don,



I agree with Scott.



Also,  double check with the plans and call Van's if there are still

questions.  This is an important step.  Primarily due to minimum edge

distance requirements on the rear spar.  I seem to recall that some sweep

forward or aft (1/2'?) is permitted but not sure and I wanted to try and get

them perfect. So....



Assuming minimum edge distances are complied with, I trimmed to minimize the

sweep.  I was able to bet the sweep to be zero.  Originally I had left the

rear spars slightly long (about 1/16 as I recall).  I then trimmed this to

clear a rivet head.  



Five plum bobs worked for me.  One from the tail area, one inboard, one

outboard on each wing, all hanging at the same time. (I drilled a 3/32 hole

in the center of the fuse near the last bulkhead to make a convenient place

to drop a plumb line from).  I snapped a line on the floor under the wings

the full length of the wingspan.  I then pulled each wing (only had to do

one) to get all the plumb bobs to point to the center of the line.  The

outboard bobs hung from the last rivet line. This was important because

where these bobs intersected the snapped line, I made a mark on the floor.

I then measured with a long tape to the bob hanging in the tail.   When the

left and right triangulations agreed, I knew I had no sweep and straight

wings.



This was on a RV7A but I think it would be the same on a 8.



Good luck



Bevan



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pgroell(at)numericable.co
Guest

Posted: Sun Aug 05, 2007 12:18 am Post subject: wing mating

Hello,



About the rear spar and rivet interference have a look at this page, about

2/3 down.

http://www.jeffsrv-7a.com/WINGS/05-11-20.htm



Pascal



-----Message d'origine-----

De : owner-rv7-list-server(at)matronics.com

[mailto:owner-rv7-list-server(at)matronics.com] De la part de dhall(at)donka.net

Envoyé : samedi 4 août 2007 23:06

À : rv7-list(at)matronics.com

Objet : wing mating






Having some doubt on getting the wings aligned.



I've got the wings in place with drift pins.  

- i carefully leveled the fuse, longitudally and laterally.

- I suspended 3 plumb bobs each wing, out/mid/in.

- I stretched a line between the outboard bobs.  The other 4 bobs were

behind the line.  Suggests forward sweep.

- I restretched the line between the inboard bobs.  The outboard bobs

were about 1/8-1/4" forward. Also suggests forward sweep.

This suggests I have forward sweep.  



The problem is that I can't nudge the wings to take out the sweep.  I

have two issues:

 a) The rear spar is snug against the fuse, mostly interfering with the

round head rivet just above the attach point.

 b) The flap is already very snug to the fuse.  



In order to take as much as 1/4" sweep out, I calculated that I need

between 1/16" and 1/32" movement on the rear spar.  Minor trimming

around the rivet and the inside edge of the spar would give me the

movement I need, but the flap fit is already so snug, nearly perfect, so

there's doubt. If I move the wing to take out fwd sweep, It looks like

I'll have to do some minor reshaping of the flap to avoid interference

with the fuse.



Questions:

- Anybody else find similar rivet or flap interference?

- Is it normal to have to tweak the flap fit along the fuse?

- Should I also be concerned about having to trim the rear spar? 

Thought I was precise on the original cut, but I guess I could have been

off by a hair.  



Man, it was a bear to get the wings in.  I don't relish the thought of

taking them in/out for trimming and tweaking... 



Don

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colfearnow(at)earthlink.n
Guest

Posted: Sun Aug 05, 2007 4:17 am Post subject: wing mating

wing mating,

DHall,

I had the same problem...the wing rear spar was too tight.  Van's told me 

that a 1/4 to 1/2 is not a big concern...but I wanted zero, or at least 

close to it.  I had to trim the two mating surfaces to get the sweep to 

zero; go slooowwwly and be conservative and it will be perfect.



Remove the flap first than work your sweep.  I had to trip my flap skin 

quite a bit to make it clear and look even (on both sides).  Again, be 

conservative and take your time.

Ron F.

-7A, Canopy/baffling/cowling



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Bob Collins

Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota

Posted: Sun Aug 05, 2007 6:08 am Post subject: wing mating

I went with the Van's method... I had a 1/8" sweep and paid attention to the

Van's "get real" admonishment, mostly because I'm not an engineer and they

are. But I can see where people strive for perfection. The question I have

in this regard is what IS the flying difference between, say, 0 sweep and

1/45" sweep. 



One warning to all -- The "window"  (i.e. the area) to drill the bolt hole

in the rear spar fork is MUCH smaller than most people think. Be very

careful about how much you remove in that area.



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_________________
Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/

wgill10(at)comcast.net
Guest

Posted: Sun Aug 05, 2007 9:23 am Post subject: wing mating

The "window" is indeed very small. IIRC, I had a window 1/16" wide X

5/32" tall. 



Bill



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