Wing Ribs Construction


One main point here is that the front and rear rib sections are all the same.  Because of the positioning of the flange is the only difference between the left and right wings, you can prepare all the rib sections at one time without being concerned about left or right.

I made a couple of jigs and then proceeded to prepare all the rib sections in advance.  It mad for a very quick and easy operation.  The following shows some of the details of the operation.

I fabricated a quick jig for positioning of the holes
for the electrical conduit and for the pitot lines.  
The jig was made from 5/8 in scrap board left over
from the wing jig construction.
Due to the installation of the ribs being the
same on both sides, the holes can be place in
the same position on all the ribs at once.
I used plastic gromets with a 1/4 inch inside
diameter and bonded these into each of the
holes for the pitot lines.  The cavity on the
inside of each gromet is then filled with
silicone sealant once the pitot lines are
installed.  The result is secure pitot lines
without binding or rubbing against the sides
of the glass ribs.  It is also a very flexible
installation and allows the lines or the wing
to flex.  
The two inside ribs of the fuel bay will need one or
two aluminum inserts for the fuel outlet and return
lines.  These are fabricated by the builder and then
glassed into place.  These ribs are also cut short
by three inches for clearance of the main spar.
The above shows the required drill bits and
threading dies required for fabrication of the
fuel outlets.  My personal opinion is that I
would have been glad to pay extra for these
to be fabricated by the factory.