RANS S-20 RAVEN
TEXT MANUAL
09/01/2013
07-03
(AFTER ATTACHMENT OF WINGS)
11.
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 07-11
.
NOTE: The straight edges used should only rest about 1” on the wing.
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.
12.
It is possible that the Ribs require some minor forming to follow the
contour of the wing root. The Ribs mount to the underside of each tab.
13.
Position the forward end of the Outer Ribs under the Fuselage tabs on the
Carry-thru.
14.
Position AFT end of Outer Ribs on the outside of the aft attach tabs
forward of Station 3. Align ribs straight forward and locate the outer #30
hole in the tab on the carry-thru on the rib centerline. Refer back to
FIGURE 07-02
. Transfer drill Outer Rib and Cleco.
15.
Bring the ribs up to contact the straight edges.
16.
Drill Outer Ribs # 30 at the aft end through the aft attach tabs (rib mounts
to the outside of tab) on the side centerline of the rib. Cut Outer Ribs off
just behind the aft attach tab. If aft mount tab extends above rib, then trim
tab as needed.
17.
The Center Rib mounts to the underside of the forward center tab and on
top of the aft tab. Transfer drill Center Rib # 30 through the forward tab
and cleco in place. Bring the rib up to contact the straight edges. Mark the
aft end just forward of Station 3 top tube. Check, mark and cut off. Position
aft end, centered on the tab, and transfer drill #30. Rivet in place.
18.
Countersink rib-mounting holes in all forward tabs and rivet in place with
flush rivets.
19.
Burn small holes through the fabric at the locations of the 6 tabs on the aft
top of Station 3. The Skylight will later be riveted to these tabs.
20.
The Windshield and Skylight are joined together with two mating strips.
Pre-drill the mating strips as shown in
FIGURE 07-20
.
HINT: Cleco the 2
strips together as you drill.
NOTE: The center set of holes should be
located to pick up the Center Rib, as well as the corresponding holes to
the Outer Ribs.
Lay the windshield and skylight on a clean flat surface.
Mate the skylight to the windshield. Center the top and bottom mating
strips on the windshield and skylight seam. Use the previously drilled
holes as a guide, transfer drill through the mating strips, windshield and
skylight. Cleco as you go. Remove mating strips and deburr. Paint mating
strips as desired.
