Wednesday, February 12, 2014

A Short Detour To Section 26

At this point in section 24 of the RV-12’s assembly instructions, the baggage bulkhead components are prepared for assembled. Unfortunately, one of the first tasks requires match drilling the tail cone’s shear clip to the F-1207C the left and right baggage bulkhead frames before they are riveted onto the fuselage assembly. Both bulkheads are to be temporarily Clecoed in place onto the tail cone so two holes in each of the baggage bulkheads can be match drilled into the tail cone’s shear clips.

Not happening today … the tail cone is in the shed which will require snow shoveling just to get the door open and it is cold. Tomorrow we are slated to have a one day heat wave … all the way up to 36 degrees. So plan on taking advantage of that and will get to the tail cone for the match drilling tomorrow. Meanwhile, in an effort to continue chipping away at unfinished tasks, decided to skip to section 26 and begin working on the RV-12’s seats.

Section 26 begins by instructing the builder to cut and prepare six hinge pieces which will be installed onto the seat backs. These will allow the pilot to make adjustments to the seating prior to flight and to flip the seats forward to access the pins that hold the wing spars secure. Of the six hinge pieces cut to size, the two F-1237H hinges require having one of the eyelets removed … in the photo below, the red eyelet needs to be cut away as pointed to on the lowest hinge in the photo.

Cut hinge pieces for both of the RV-12’s seats. The red eyelet needs to be removed as done on the bottom hinge in the photo.

After the hinge pieces are cut to the proper length, a locating hole is drilled into each hinge. This hole will allow each hinge to be Clecoed onto the seat back parts so the remainder of the hinge can be match drilled. The hole location was center punched and then drilled using a small drill bit to create a lead hole … then the hole was enlarged in steps to a final size of #30.
Drilling a lead hole into one of the hinge pieces.

The hinges were then Clecoed into position using the lead hole, clamped with a few Cleco clamps and then match drilled.
Using the lead hole to position the hinge for match drilling.

Match drilling one of the hinges to the seatback brace.
Hinges for both seats now match drilled.

Unfortunately, after all the drilling is over, I can’t bring myself to rivet the hinges onto the seat back parts because the hinges are not primed or painted. It would bother me to no end to have some hinges painted and others not. Last Fall I just simply ran out of time, so figured the seats could wait until spring to get assembled. So priming and painting of the hinges will be done then. After all, there’s really no rush … won’t be flying the airplane any time soon. But there sure would be a cool factor to be able to sit in the cockpit … oh well, will have to wait until Spring.