TitleGarrison

“No bird ever flew nonstop from New York to Tokyo, or raced 15 miles high at triple the speed of sound.                                                                                                   
  But birds do something else.
  They do not conquer the air; they romance it..”

  Peter Garrison

HoursAndCounting

Jur's RV7 Aircraft Factory
2917 hours and counting
Some decisions in life are bare of any obvious logic

 

Final measurements - 22/07/2012 - 4h

Details
Parent Category: Wing
Category: 4. Main Wings
Hits: 1107

The tank is mounted on the left wing spar. I had to touch up the dimples in the rear spar and put some primer on them. Then closed the open rivets on the top line in the flange of the spar where no skin is attached underneath the tank skin. (rib to spar flange).

I clecoed on the top skins and remeasured for twist as I wanted to be absolutly sure that all was still level before starting to rivet.

The measurement between skin rear spar position and the plumb bob read 2 inch 20/32nds on the outboard position

The measurement between skin rear spar position and the plumb bob read 2 inch 20/32nds on the middle position

The measurement between skin rear spar position and the plumb bob read 2 inch 19/32nds on the inboard position.

I was again puzzled by this 1/32" difference. Although it's well within acceptable limits, I kept wondering how this can be.

In the end, the explanation is very simple. The aft side of the wing walk doubler plate is squeezed between the rear spar and the top skin. That means that the layer there is thicker then it is in the middle and outboard position. It accounts for more or less 1/32".

In other words, there is NO twist at all on my left wing ! Jihaaaa !

Before rivetting, make sure that all holes get a cleco for maximum skin thightness. What you don't want is 'wobble' sounds when you push between the ribs.

I also took a picture of the 3 inboard z-bracket attach points. I still had to set these nutplates.

They are a real pain in the ass. You can reach in with the bucking bar but the nutplate ears are very close to the doublers on the spar and it is easy to mar or damage them when bucking. I taped them of with duct tape and was very carefull on the bucking.

Used the backrivet set on the other side for the rivets near the border because you can't reach them with the mushroom head. Not sure if this is such a good idea as now I have some small smiley markings on my spar web by using that.

Then measured on top of the wing... level on all 3 position.

And level on the root of the wing in the cross direction.

All systems are 'Go' for rivetting.

Wings Kit

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It’s possible (not likely) that I’m not as smart as I think I am. (Occasionally, I have moments when I know this to be true. Fortunately, the feeling passes quickly.) Although I have tried to make this information as accurate as I can, it is not only possible, but also quite likely, that erroneous and misguided information lurks within these pages. I cannot and do not warrant these pages to be error free and correct. Furthermore, I accept no liability for the use of this (mis)information. And, as many would say, your mileage may vary. If, after reading this, you are intent on proceeding, please be aware that the contents of this site are protected by copyright (copyright © 2011 and 2012). Nonetheless, you may copy this material subject to these two conditions: (1) any information used is for non-commercial purposes, and (2) the source of the material is properly credited. Of course, you may link to any page herein. At some articles, snippets of the plans from Vans are visible. These are for educational and illustrations purposes only and should never be used as plans for part construction or assembly as plans may have changed since the picture was taken and more important they are protected by Copyright by the Vans Aircraft Mothership company.

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