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

 

Wing Mating

25/05/2020 - Fuel tank attach bracket - 5h15

Details
Parent Category: Wing
Category: 9. Wing mating
Hits: 457

Jumping a bit from left to right in the build process and decided to attach the fuel tank attach brackets to the fuselage. These brackets stabilize the fuel tank in front of the wing.

It's a steel bracket that is bolted to the fuselage side skin and attaches the fuel tank attach bracket with a 'loose grip'.
One hole was already drilled when I made the fuselage side skin. Now it's time to hang the attach bracket perpendicular to the side skin and drill the second hole #12.
The regular way of doing this using a center line marked on the skin and then cleco the attach bracket to the top hole. Center the line in the hole of the bracket and match drill the bracket using the hole as a guide.

 The bracket held in place with a vise grip. You may need to slightly bend the attach bracket in the last inch to have it mate perfectly with the fuel tank bracket. Mine fit without tampering with it.

In the next image, you can see the centerline through the bracket (green).

And drill the hole, deburr

Now the fuel tank attach bracket can be bolted to the fuselage.
Clamped the bracket back onto the fuel tank attach bracket and drilled the hole through the back slot for an AN4 bolt.

As you can see, this is a 'slip bolt'. The bolt will be held in place with a large washer and a nut.
The reason why this design as such is for safety reasons. If ever you end up in a crash and the nut would be thight in a regular hole, then on impact the fuel bracket may tear out of the inner rib, destroying and opening the fuel tank.
Imagine that happening with lot's of fuel in the tank. Not a good idea. Instead, this slip bolt construction will safely detach the tank from the fuselage on impact without destroying the tank.

 Here's a shot with the washer installed.  There is no nut on at this time. Notice how the attach bracket butts nicely against the tank bracket without gap.

Same work now on the other wing.

Clamping

And drilling the hole leaving lot's of edge distance all around.

 

Both wings are now fully mated to the fuselage. Another step to remove from the to-do list.

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Some advice on reading my log for fellow builders !

In some articles, I made corrections at later date on the original article to rectify my own stupidities or faults. Read through the entire article if you intend to use my findings/experiences on your own project !

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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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