Purpose

This is a blog containing the build history of an experimental home built airplane. The RV-7A is a two place, piston powered, low wing, tractor configuration, tricycle gear, aluminum and composite aircraft. The original purpose of this blog was to document the construction of my experimental category aircraft in order to satisfy the build log requirement for the FAA. Now it's just for the amusement of friends and family as I document some of our aviation experiences. For more information on the RV series of aircraft see www.vansaircraft.com.

Monday, March 26, 2012

Step 4.1.1, Elevator counter weight revisited

I think I mentioned in the previous post that I had some difficulty with drilling the holes in the center of the forward flange of the tip rib and counter weight rib.  It was during the reassembly of those parts after priming that I finally pieced together what had gone wrong.  It seems that when Chuck and I assembled the counter weight skins prior to drilling the counter weights, we both got it backward or more accurately, upside down.  It was pretty obvious when viewed in conjunction with the elevator skin but somehow it was not at all obvious to us at the time not having the elevator skin as a reference.  So in this case, two heads were just as bad as one!  The only harmful effect is that the holes in the forward flange of the tip and counterbalance ribs are not centered, but are still usable.   However, the holes in the counter balance weights are in the wrong place once the counter balance skin is flipped the other way.


To correct this flub, I first plugged the holes along the back side with some aluminum tape.



Then a piece of lead that was previously cut off, is melted and allowed to drip into the holes completely filling both holes.





Finally the excess is filed off and the holes are re drilled and countersunk.  An hour later I was back in business and making progress on attaching the elevator skin.  Which will be the subject of the next post.


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