Chapter 3 -
Wing
3.4 - Experimental Fit
Page 7
3.4
Experimental fit
Select the ribs for the assembly (there are no ribs on the right or left side, so just
select the required number of parts). Again, remove all peel ply and sand the corners for
personal safety when handling. Prepare the rib gluing areas in the same way as the other
gluing areas – roughen the surfaces with sandpaper and clean. Experimentally assemble
the spars and ribs to ensure they will interfere with each other, mark the areas of the
placement for later reference. The lines of placement of the ribs are measured at the
centerline of the sandwich panel of each rib. Their positions are BL – 27.5; BL – 52; BL
– 85; BL - 118; BL
– 125; BL – 157.5 (right and left). Remembering that for BL 125 there is only the front
rib.
Pay particular attention to the orientation of the ribs. The top and bottom parts of
some rib sections are easily confused, also remember that we are building the wing from
top to bottom. Note again that there are no left and right side rib sections. The rib flanges
will point outward from the fuselage on the right wing and toward the fuselage on the left
wing (pictures and sketches show the right side of the wing). Clean and scratch the areas
of the top cladding (based on these marks) which will be glued together with an 80
sandpaper similar to how you prepared the spar flanges and ribs.