SECTION 12: EMPENNAGE FAIRINGS

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Page 12-2

Step 1: Good results were achieved by clamping an aluminum strip along the recess edge and then using a Dremel with router attachment to square the edge. Even though the Dremel has the potential to eat into the aluminum strip, one can guide the Dremel in a fashion where it barely touches the strip.
Step 4: I was unable to dimple the most rearward of the skin holes for a #30 hole and I had to purchase this tool: https://www.aircraftspruce.com/catalog/pnpages/12-00612.php

It is possible to 3D-print a mold and lay up a fiberglass cap that goes onto the leading edge of E-912 instead of building it up to match the curvature of E-913. The 3D-print project is here at Onshape. The 3D-printer file is here HS_Fairing_Mold1.stl.
It is possible to 3D-print a mold and lay up a fiberglass insert that goes into HS-910. It has the right curvature and it has the necessary kink to match the Elevator counter weight leading edge. The 3D-print project is here at Onshape. The 3D-printer file is here HS_Fairing_Mold2.stl

Step 6: There is no machine countersink bit with a pilot that would fit exactly into the threaded part of a #6 screw (#36 hole), only for the #28 hole that the screw goes through. Use the countersink bit for 3/32 rivets (#40).