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The first thing I did today was make a chart of where all of the ribs go. It is just way to easy to screw this up. I verified all of the ribs on the right wing and match drilled all of them -- except for the outboard one. This is the only main rib that gets match drilled to the leading edge rib. Once everything was match drilled, I put on the leading edge ribs and match drilled them. The outboard leading edge rib was match drilled to the outboard rib using a long #30 bit. Not all holes on the ribs are match drilled. There are a few that aren't, which leads to 2 extra holes in some rib flanges. Worried me at first, but Van's goes over it in the instructions. Next was deburring all of the holes. I was sure to remember to get the spars also. Finally I need to figure out how to run the conduit. I am going with Van's conduit, which requires a 3/4" hole in all of the ribs. Van's has a PDF on their website with a recommendation on the hole. Basically it is the lower 1/3 of the rib between the first and second lightening holes. I makes on the rib where the rivets to the skin are, since I don't want interference with the bucking bar. I drew a line in between two rivet holes and I think I am going to put the hole 1/6th of the way up the rib. Basically splitting the difference with Van's. I am going to sleep on this and make the holes tomorrow. Blury shot of the extra holes in the rear flange of a rib.    This is my cheat sheet for where the ribs go. I also put which direction the flanges go on the rear spar for peace of mind.  This is the PDF from vans on conduit placement  This is the line where I am going to put my hole for the conduit. The mark on the the top of the line marks the 1/3 point up the rib -- the upper limit of the hole, according to Van's. 
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Last Modified: August 13, 2023 |