Monday, October 4, 2021

Finished mounting the horizontal stabilizer - 4 hours

Now that I have the front of the HS set. It’s time to set and drill the rear spar of the HS to the fuselage. 

I placed 3/16” drill bits as spacers under the rear spar. I also placed a level and a laser level on the HS just to make extra certain I was in good shape. 



Next I went to double check the angle of incidence something seemed really off. The manual seems to suggest to reference the tooling holes in the ribs as a guide, so placing a long drill bit in the tooling holes reveals this is not a good reference. The tooling holes of the HS-00005 ribs at the front are just fine, however the tooling ribs at the back is way off. 


So, what to do now…Well, After a series of head scratching moments I decided to draw center lines on the forward spar and the rear spar. Then I can compare these with the distance off of the aft deck. Zero angle of incidence means that the center of these 2 spars will be the exact same. Sure enough the 3/16” spacer at the back is almost spot on, It does need to be increased by a tiny amount (just a tad over 1/64”) Nothing a  layer of masking tape on the aft deck can’t fix. After double and triple checking the measurements….I was ready to start drilling. Access is so good for using a drill jig.