Saturday May 28th, 2005|
Clecoed, Started Drilling Seat Rib Area
Today was pretty much a full day on the project. I started out by modifying the seats ribs. Four of the ribs (two left and two right) get modifed like the left one above. The one on the right shows they way they come out of the box. They get modified so the stick assembly will have room to move around in there.
And the two inner-most seat ribs get cut (there's a plate that re-joins them together above. The panels are removable with screws so that the stick assembly can get removed. All this still needs to get deburred, etc.
Then I started clecoing the seat ribs to the aft center section half and the seat back bulkhead.
Here you see the two center ribs with the removeable tops. The stick assembly gets bolted onto the web of the center section.
On the rear spar carry through channel you can see where some snap bushing holes need to get cut ouf the seat ribs (and also the baggage ribs).
Doh! Here's a mistake I made earlier. I riveted the two outter holes and the bolt hole also get the F-715 ribs attached...so I removed the bolts and drilled out the rivets.
The F-715 is kind of weird. It's not pre-punched and it has to get bent to match the contour of the holes. The plans also have 1/32 of the flange show on the sides of the seat pans, so it's a bit awkward getting the rib in there. I kind of got it lined up and marked the holes, then pulled it back out and fluted between where the pilot holes are until I got it about right then put it back in.
On to the baggage ribs. Since I'm building a -7A (tricycle gear) and the wings are quite a bit higher off the ground than the taildragger, I'm installing steps. The instructions tell you to drill some holes in the outtermost rib at 1 and 5/8 diameter...but...
The drawing says 1.5. Hmm...I just cut it to 1.5 and then used my brass-handled deburring tool to enlarge the hole until the step would slide in.
Here's step through the rib...for whatever that's worth.
Then I started clecoing on the center bottom skin. This thing has a thousand holes in it!
Here's the hole thing clecoed. I drilled all these holes out and then my back was really bothering me. I shouldn't have done this bending over the way I did.