09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
132
1.
Collect all the parts shown on the part pages for the windshield. Extra care
should be taken when working with Acrylic and Lexan. Both may scratch easily
and as much as possible of the protective plastic should be left in place until the
aircraft is ready to be flown.
2.
Drill all 3 windshield tabs located on the leading edge spar carry-thru as shown in
FIGURE 10G-02
.
3.
With the wings attached to the fuselage, position and tape at least two straight
edges from wing root to wing root as shown in
FIGURE 10G-03
. The tape will
help to keep them in place, while fitting the Outer and Center Ribs. The straight
edges will be used to set the height of the windshield ribs level with the wing root.
NOTE:
The straight edges should only rest about 1
” on the wings
otherwise the wing dihedral will raise the position of the windshield and
skylight.
4.
The Ribs may require some minor forming to follow the contour of the airfoil at
wing root. To conform the ribs gently bend over a curved edge of .75" thick
plywood cut to a 12" radius, or similar object. If over bent flatten by pressing
against a flat surface. Make small adjustments comparing to the wing root often.
5.
Radius the top front end of the each rib as per
FIGURE 10G-02
. Center all three
ribs on the S-2 carry thru tabs and drill and cleco #30. These holes will be
counter sunk for #30 flush rivets in a later step. Refer to
FIGURE 10G-02
. To
prevent the ribs from bending the tabs on the S-2, tape them in place on the aft
tabs. Tape the aft end of the middle rib to the top of tab on the S-3 carry thru.
6.
Position AFT end of Outer Ribs on the outside of the aft attach tabs forward of
Station 3. Push the outer ribs up to touch against the straight edges. Transfer drill
and Cleco. See
FIGURE 10G-06
. Trim the end of each as required.
7.
Trim to length the middle rib to overlap the tab with sufficient edge distance.
Center on the rib on the tab and transfer drill #30 from the bottom.
8.
Countersink rib-mounting holes in all forward tabs and rivet in place with flush
rivets.
9.
The windshield is supplied very close to final shape. If there are any black
sharpie lines, trim to these lines. Fit the windshield in place. Refer to
FIGURE
10G-09
. Tape in place. The windshield is held in place by clamping action of the
hold down and mating strips, the exception is the 5 fasteners used to secure it to
the middle rib. These are the only fasteners to be used to secure the windshield
in place. Drilling of these holes is called in a later step. Please pay attention to
what type of drills to use and temperature to work with the Acrylic.
