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

 

In final preparation before hanging the engine mount, I had to think of the remaininng firewall forward plate work.
One of the things missing were the firewall passthrough holes for electrical wiring on both left and right side.
The left/passenger side hole will be used to pass the battery cable to the vpx and master switch etc. The right side will host engine monitoring cabling.

There are no location specifications on the plans but found the dimensions as shown in the picture from Bruce's website. 2 inch from the top angle and 2" 9/16 from the top rib. I did the same on both sides.

Drilling through stainless steel firewall is a pain. The firewall plate is mounded so no way to use a drill press. I figured the best way would be to have the back supported by a clamped big wood block.

Made the first cut on the pilot side with a regular twisted drill bit #40 and then enlarged.

Used a hole cutter to upsize to the larger diameter and deburred carefully. That stailess steel burr will cut through your finger like a knife goes through warm butter.

I then centered the safe air pass through kit parts in the hole and taped it with good old duct tape to drill the holes for the 4 screw that hold the part in place.

Deburred holes and all done.

Same precedure on the passenger side. Next image is just after being through with the hole cutter.

attach holes drilled (not deburred) and temporarily fitting the passthrough ring.

 All looking neat and clean. This will finally be installed when my 3M firebarrier paste arrives so that I can finally screw this in place.

 Forward look of the firewall so far with the two holes finished

 

How to use

Use the kit buttons in the top ribbon bar to see a chronological overview per sub section per kit. For the full chronological article list, see chronological build link in prelude menu here below. The easiest way to lookup information is by typing in some part numbers or keywords using the search option in the ribbon bar

 

Caution !

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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Legal Mumbo-Jumbo

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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