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Steve & Nancy Riffe
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Date:  8-30-2011
Number of Hours:  1.00
Manual Reference:  
Brief Description:  VS Mounting Prep-1

Picked up a couple of 48” levels and a digital laser level today. Leveled the fuse for pitch and roll—worked out great. However, before I mount the HS, I have an issue to deal with on the VS. My QB fuse came with the F812 bulkhead and the WD409 already drilled to ¼”. This creates a problem in drilling the VS spar to the bulkhead and tail spring mount. Inside the fuse, there is a slight gap between the F812 and the WD409. Also, the predrilled holes don’t exactly line up without pulling the mount to the right just a bit. There are 2 holes in the F812 for keeper rivets, but no matching holes in the WD409. I plan to use a drill bushing and drill the VS to 1/8” from the inside, then remove the VS and final drill to ¼”. To insure alignment of the 3 holes in the F812 and WD409, I bolted the 2 parts together—this removed the gap and the aligned the holes. Using the keeper rivet holes, I match drilled the 2 parts to 1/8” then reamed to #30. Next session I will c/s for a couple of flush rivets and drive them. This should keep the holes in alignment for back drilling using a drill bushing. Wanted to get this done prior to mounting the HS while a had some working room.
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Gap between bulkhead and weldment

Gap between bulkhead and weldment

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Holes need a little

Holes need a little "help" to line up

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Bolted together and drilled keeper rivet holes

Bolted together and drilled keeper rivet holes

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