SECTION 7
RV-8/8A
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8s7-1r11 06/13/11
trailing edge on the tip.
Remove the tip and lay out the rivet lines (top and bottom) 5/16" from the edge. Cleco the W-715-1 tip back on the
wing and slip the W-412 tip rib back in place. The flange edge must be flush with the tip edge.
Locate the rib chordwise so it fits without distorting the tip.
Drill and cleco the W-412 tip rib to the W-715-1 tip. Remove the tip and machine countersink it. Rivet the rib in
place.
The W-715-1 tip may be riveted or screwed to the wing (DWG 17A.) The choice usually depends on what kind of
access is necessary to service lights, power supplies, etc.
If you decide to use the rivets the tip must be reinforced with a strip of aluminum to keep the rivets from cracking the
fiberglass. Drill (#40) the aluminum reinforcement strips to the W-715-1 tip using the existing holes.
Scuff the aluminum reinforcement strip and W-715-1 tip with some 80-100 grit sandpaper. Bond the strip to the tip
with resin (polyester or epoxy). Hold the strip in place with clecoes.
Remove the clecoes before the resin is fully hardened.
When cured, cleco the W-715-1 tips back on the wing and drill out to full size. Remove the tips and machine
countersink the fiberglass to accept a 1/8" dimple.
Dimple the skins on the wing and blind rivet the W-715-1 tip on. This step may be postponed until later to permit
easier access.
If you are using screws and platenuts the platenuts may be riveted directly to the fiberglass. You may delete the
reinforcement strip. Screws and platenuts for this installation are not provided in the kit.
RV-8/8A
SECTION 7
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8s7-1r11 06/13/11
Fig. 7-3. Tape protects the main spar bars from damage when the
ribs are riveted.
Fig. 7-1. The root end of the rear spar. Note that the flanges are
already dimpled...it is hard to get a squeezer on them if the
doublers are already installed. (RV-9/9A spar shown)
Fig. 7-2. Main ribs are fitted and drilled to the main spar.
Fig. 7-4. A pair of posts and brackets hold the wing in a
convenient position. The posts under the rear spar keep the
structure from sagging. Here the leading edge is fitted to the
wing skeleton.
Fig. 7-5: The tank and top main skins are fitted.
Fig. 7-7. Tank sealant is mixed in a shopbuilt 10:1 balance.