Working away on the F-715 Seat Ribs - 7 hours

I'm glad to be able to put a decent day into the build. As usual work is very busy and the lack of work shows. But fortunately I put in a long day. Since the center lines are all marked out on the ribs. I need to figure out where to flute the ribs. I started by clecoing the ribs to the F-705 bulkhead. 

Next, I managed to mark the rivet holes on the under side of the ribs on both sides. Since I know where the rivet hole are to be drilled. I can start to flute the ribs. Lining the edge of the rib with the arc of the rivet holes in the bottom skin works perfectly to adjust the curve.

Now that the rib contour is roughly figured out. The top needs to be fluted. In order to determine the fluting location the mounting holes need to be marked. I dug out the seat pans and cleco'd them to the assembly.


 
 At this point the mounting holes and defined and I can flute accordingly.
 
 Since the mounting holes are far apart on the top of the rib. I used a nut plate to determine where to flute and not affect the mounting the nutplates.

This ended up to be quite a long tedious process. But its worth it in the end. Most important is to take your time and check the curve by continually clecoing/unclecoing the seat pans to get the right curve. Not that the curve is set, the rib doesn't want to sit in place easily as the rib is slightly too long and rubs on the main spar/F-704 bulkhead.

Reading other build logs it was apparent to pay attention to the area as some have trimmed too much and had edge distance problems. So I marked out the rivet holes drew a center line and then drew a line of where I needed to trim. The trim line still gave lots of edge distance so all good there.

Now that the ribs will fit nicely in place. I started to match drill the rivet holes...Starting from the rear and working forward. Again, a very tedious process, but the center line was very easy to see through the rivet line. I drilled the first hole and confirmed edge distance was ok as the rear most hole is quite close to the end of the rib.

I continued on, Drilling and checking.

By the end of the evening I was just about finished the right rib when I decided to call it a night.

Started working on the F-715 seat ribs - 2 hours

Still working away on the nutplates. Finished drilling the standard nutplates. The two nutplates on each side of the F-705 bulkhead need one-legged nutplates. I decided i'll finish those later..I'm a bit eager to get working on the seat ribs.


I then measured the F-715 seat ribs for center.
 

More nutplates - 2.5 hours

So one of the items that I missed was to drill the nut-plates in the flange of the F-705 bulkhead. Like the other nutplates, I used a sacrificial nut-plate to drill the needed holes. Unfortunately since the bulkhead is already primed, I didn't want to draw a center line so I had to line each one up individually. Took a little time to get it all lined up.

Finished riveting the bottom center section - 1 hour

Well, I managed to find some time to get back into the garage and I finished riveting the bottom skin of the centre section.

And a little more - 1 hour

Spent a little time riveting. Managed to get about half of the two rivet lines done. I bit tricky to get to solo.

Just a little more - 1.5 hours

Again, need a break from work. Kept riveting, and now I just have to two centre rivet lines to do
 

More riveting on the center section bottom skin - 4 hours

Again, insane busy at work and have to work the entire weekend. I managed to slip out to the garage and set some rivets as my eyes are bleeding from staring at a computer. Managed to get quite a few rivets in.