15
❏
5. With the retract assemblies temporarily in place, mark the
wing where cutouts will be made to accommodate the coils in
the struts. Remove the struts and use a rotary tool with a drum
sander bit to carve away the wing up to the marks you made.
Reinstall the retracts and confi rm that the struts can move
up and down without interference. When satisfi ed, coat the
exposed foam and sheeting edge with epoxy or foam-safe CA.
❏
6. Temporarily slide the axle shown in step 10 onto the end
of the gear strut to ensure they are centered in the wheel wells.
Mark the locations of the mounting holes onto the retract rails.
Remove the retracts and drill 3/32" [2.4mm] holes at your marks.
Thread a #4 x 5/8" [16mm] self-tapping screw into each hole
and then remove it. Apply a couple drops of thin CA to each
hole and allow the glue to harden.
❏
7. Turn the wing over and measure back 5" [127mm]
from the center leading edge of the wing and make a mark
approximately 1/2" [13mm] on each side of the seam of the
wing panels. Cut a 5/16" to 3/8" [8 to 9.5mm] hole at each mark
you made through the sheeting to a depth, approximately 1/4"
[6.4mm], which exposes the channels cut into the foam core
of the wing. We suggest using either a rotary tool or a brass
tube with a sharpened edge to make the holes.
❏
8. Connect air lines approximately 16" [406mm] long to
the retract valves. Use different color lines for each side of
the valves to simplify the T-connections you will make later.
Consult the Robart manual for details. Feed the lines through
the channels cut through the inside core of the wing. Grab the
ends of the lines through the holes you cut in the previous step
and pull them out. Fit the retracts back into the wings, being
sure that the lines are not pinched. Push a little excess line
underneath the retracts to ease removal should it be necessary.
