Wednesday, April 20, 2016

Empennage

Elevator ( 4.5 hrs )

Sect 9-14:  Spar riveted to Bottom Skin, and riveted 2 Horns.  The specified 3.5 rivets were slightly long, so had to be careful with alignment while starting each shop end (back riveting) to prevent curl over.  
bottom skin with horn attached


Prepped for bonding T.E. w/ 3M UHB double sided tape.   Also cleaned scuffed zones for bonding Foam Ribs.   Steps 3-6 included first time using Tank Sealant (otherwise known as Pro Seal).  As expected - kinda messy, high viscosity,  tacky, and smelly.  But planned ahead by double layering latex gloves and plenty of paper towels handy.  Not so bad as some builders have noted, but they again I wasn't sealing lots of ribs, rivets, etc in the wing fuel tanks.

Pro Seal coating Foam Ribs, ready for Top Skin.

Attached front half Hinge...great alignment. (Next: flip over, weights added for 2-3 days)

Really pleased with straight, tight layering and flush rivets.  No warps or waviness, but I haven't riveted T.E. -- since this assembly first needs to fully cure under weights for 2-3 days.    Note:  good idea from other builders to wear extra layer of gloves  --  removing one layer half way through process help keep the trim tab (and me !)  free of sealant except where expected.  

Sect 9-15:  Masked around locations for Foam Ribs on main Skins - then scuffed with 150 grit sandpaper.  After cleaning, masked those areas to prepare to spray primer (only intend to spray specific areas where working on holes, etc has damaged Alclad protection ).