Monthly Archives: September 2017

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Empennage Fairings (6)

The tedious work of sanding, fitting, aligning, and build-up continue on the fiberglass tips for the elevator and horizontal stabilizer.  The nice part about fiberglass is you can add or subtract material as desired.  The down side is having to wait at least 24 hours between operations.

Here is a case of trying to level the HS tips, then fill as needed with resin/glass beads (white) or Awl Grip fairing compound (pink).  The same operations apply to the elevatore tips.  Sand, fit, fill, rinse, repeat…

 

 

 

The left shows backing washers clecoed for superglue attachment to the elevator tips. These are not required, as these holes are supposed to be countersunk, then pop riveted onto the elevator.  However, experience has shown the fiberglass gets very thin after the countersink operation, so this attempt should reinforce the connection.

 

 

… and while waiting for the next round 0f build-up to cure, I started adding the nutplates to the horizontal stabilizer.  Eventually these will fasten a custom fairing which sits between the horizontal and vertical stabilizers.

Empennage Fairings (5)

Work on the vertical stabilizer and rudder fairings was recently completed – at least for the time being and until final preparations for paint are underway.

My overall satisfaction level is good with the overall fit, gaps and blending of skins to fairings.

 

 

 

 

The upper and lower elements are clecoed in position to check the final rudder angles, gap tolerance on the upper rudder swing and rudder/vs skin clearance.  All within tolerance and acceptable for now.

 

 

 

The next fairings to be addressed are on the horizontal stabilizer.  To properly fit these, Section 11 Tailcone Attach elements must first be completed.  The elevators are fastened to the rod end bearings of the HS, then angles and clearances checked for free movement.

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Here the HS cradles in the jig built many moons ago with the original construction.  The elevators are in position to begin work on the fairing alignment.

 

 

 

Close-ups of the gap between elevator tips and horizontal stabilizer, then the rod end bearding and the hinges.

 

 

 

 

Initial fiberglass filling of the HS end caps after rough trimming to shape with the elevator tips.  These are not straight – bending backwards at an 8degree angle. This is enough to  prevent the fiberglass molding from being simple.