Tuesday, April 18, 2017

Empennage, Rudder (Part 16)

Tonight was a short work night, but I got one step closer to finishing the Rudder.  Besides the fairings, all I have left is to rivet the Trailing Edge and roll the Leading Edge and rivet.  I picked up from Sunday's work by riveting the Top Rib to the Skins.  The two pictures below show the aft (first picture) and forward (second picture) areas of the Top Rib completed with all the rivets installed.  If you recall from the previous post, the Rudder Counterweight is installed under the Top Rib in the forward area.  In the second picture, it is located under the two prepunched holes in the Rib.
 
 

The picture below shows the opposite side of the Top Rib with the manufactured heads of the rivets.  The last three rivets (MK-319-BS) were installed per the plans instead of 426 flush rivets.  There isn't enough clearance for the yoke of the pneumatic squeezer or a bucking bar to use the rivet gun on regular 426 flush rivets.
 

The picture below shows the completed Horn Brace.  The Horn Brace uses a combination of AN470AD4-6, LP4-3, and AN426AD3-4 rivets.
 

The plans call for the Left Rudder Skin to overlap the Right Rudder Skin as shown below.  A lap joint (slight bend) is made in the Left Skin in the area the arrow is pointing.  This helps the skins remain tight together after the rivets are installed.