Time: 6.0 Task: Countersunk wing spars for tank platenuts
Big day today! I started on the spars by countersinking all
240 holes for the rivets that will hold the 120 tank attach
plate-nuts. I then riveted the plate-nuts on with 3-4 rivets
and countersunk the screw holes to accept the dimples in the
tank skin. I also countersunk the holes for the wing inspection
a few of the many #40 holes that were countersunk for plate-nuts.
the tank attach plate-nut rivet holes have been countersunk
on the right wing spar.
it over and repeated on the top of the spar.
clecod the K1100-8 plate-nuts in place and riveted one side,
removed the cleco, and riveted the other side. Repeater 30
tmes for each side of the left spar.
plate-nuts were riveted in place, it was time to countersink
the screw holes. The plans call for using a #30 countersink
pilot and to make the OD of the c/s hole approx 0.370".
With a screw in place, there is an obvious halo around the
countersink. The spar will accept the dimple of the tank skin
which will be a bit larger than the screw.
I riveted the K1000-6 plate-nuts in place with 3-6 rivets.
the screw holes on the left spar countersunk!
Taped an area just
outside the plate-nuts for priming.
The left spar countersunk
site represents the work of Trevor Conroy and in no way implies
the correct or suggested method of constructing an amateur built