A momentous moment at DOG Aviation … rolling of the “canoe” as it is called in the world of Van’s aircraft builders. The tail cone “canoe” was successfully rolled and placed in the upright position on the workbench without incident.
Admittedly, rolling the RV-12 “canoe” is not
much of an event when compared to my friend Pete’s RV-9A canoe rolling.
Nevertheless, it felt the same … a joyous moment, celebrating yet another level
Jan helping out with the rolling of the RV-12 tail
cone “canoe” to the upright position.
Tail cone “canoe” sitting upright ready for the
aft bulkhead and more skins to be attached.
Now that the “canoe” has been rolled there is a
need to fall back a little in the instructions to finish up the rear bulkhead’s
F-1211C hinge brackets. The hinge bearings require being match drilled to the F-1211C
hinge brackets and aft bulkhead assembly.
Match drilling the hinge bearings to the F-1211C
brackets and aft bulkhead assembly.
I’ve been holding off working on the hinge
bearings and hinge brackets because I was initially planning on using solid
rivets to attach the brackets to the F-1280 side skins. However, the sticky
wicket is in order to do that, the bearings would have to be riveted onto the
hinge brackets AFTER the brackets are attached to the skins because of
reach limitations of the pneumatic squeezer. Quite a gamble, but one I was willing to try taking
because of the precision of Van’s parts manufacturing thus far. Of course, if
solid rivets were used, the holes in the hinge brackets would have to be
countersunk to 100 degrees as opposed to 120 degrees necessary for countersunk
The tipping point for my decision NOT to use
solid rivets to attach the hinge brackets to the F-1280 side skins was the instructions. The plans are
calling for the mating of the aft bulkhead/hinge bearing assembly to the previously assembled
stabilator to determine the washer spacing and thicknesses required for free movement without
binding. This is done prior to the aft bulkhead being attached to the tailcone. Once the washer thicknesses and spacing is determined, it will be documented and used
later for final assembly. In my mind that is important ... because if I were to assemble
with solid rivets, that test would not be possible and it would truly be hard testing
the fit later using the stabilator as the moving part as opposed to the much
smaller,lighter and easier to handle aft bulkhead/hinge bearing assembly.
Once the final decision was made to pass on the
solid rivets, the hinge brackets needed to be countersunk for the 120 degree
countersunk pop rivets using the countersink cage on the drill and a drill press
for the inside row of holes which the bend in the hinge bracket prevented the
countersink cage from sitting flat.
Countersinking the F-1211C brackets for flush
rivets where the F-1280 side skins will attach.
Machine countersunk hinge brackets along with
the match drilled hinge bearings.