SECTION 8
THE FUSELAGE
RV-8/8A
8-75
8s8PP-1 r1 06/23/11
RV-8 Only:
The two open holes in the F-820-L-1 & -R-1 Fwd Side Skins are the bolt hole locations for attaching
the F-863-1 Tank Attach Brackets . Center the F-863-1 Tank Attach Brackets on the two open holes in the fwd
side skins, then clamp in place on the T-405 Angles on the fuel tanks (See “Wing/Fuselage Junction” and
“Section A-A”, DWG 80). Be sure that the tank attach brackets fit tightly against the fuselage sides, then match-
drill #12 the two holes in the fuselage into the tank attach brackets. Insert a bolt after drilling the first hole to
assure alignment.
RV-8A Only:
Make the left and right F-863A Tank Attach Brackets (See “F-863A Tank Attach Bracket”, DWG
80).
RV-8A Only:
Make the bend adjustments required so that the F-863A Tank Attach Brackets fit flush with the
fuselage side skins and the T-405 Angles on the fuel tanks as shown in the top view of “Wing/Fuselage Junc-
tion”, DWG 80. This can be done by clamping it in a bench vise with the desired bend line clamped adjacent to
the vice jaws, and then hitting it with a large hammer while protecting it with a wood block.
NOTE: The rela-
tionship of the tank attach brackets to the T-405 Angles is the same as what is shown for the RV-8 on
DWG 80 except that the leg of the tank attach bracket that bolts to the fuselage faces fwd instead of aft
(See “RV-8A Fwd Wing/Fuselage Junction”, DWG 80).
RV-8A Only:
Position the F-863A Tank Attach Brackets on the side of the fuselage as shown in “RV-8A Fwd
Wing/Fuselage Junction”, DWG 80, then clamp in place on the T-405 Angles. Be sure that the tank attach
brackets fit tightly against the fuselage sides, then match-drill #12 the two tank attach bracket holes into the
side of the fuselage. Insert a bolt after drilling the first hole to assure alignment.
Remove the F-863-1 or F-863A Tank Attach Brackets from the fuselage and deburr the holes that were match-
drilled in the previous step.
Bolt the F-863-1 or F-863A Tank Attach Brackets in place on each side of the fuselage (See “Section A-A”,
DWG 80).
Bolt the F-863-1 or F-863A Tank Attach Brackets to the fuselage, then clamp them to the T-405 Angles on the
fuel tanks. Mark, then drill 1/4, the bolt hole which is common to the two parts (See “Section A-A”, DWG 80).
The remaining work on the tank attach brackets will be completed after the wings are removed.
Make vent lines to connect between the vent line fittings on both sides of the fuselage and the vent line fittings
on the root rib of both fuel tanks (See “Iso View Carbureted System”, DWG 82).
Mark both fuel lines that are to connect to the fuel pick-up tube fittings on the fuel tanks so they can be trimmed
to final length after the wings are removed.
Connect the inboard end of the W-816 Aileron Pushrod Assemblies to the WD-807 Control Column (See “Detail
B”, DWG 79).
Tape a `stick to one of the control sticks and to the side of the fuselage to hold the WD-807 Control Column in
its neutral position.
Place the WD-421 Aileron Bellcranks in their neutral position as determined by the W-730 Bellcrank Jig (See
“Aft Iso View”, DWG 15A). Adjust the length of the W-816 Aileron Pushrod Assemblies to fit between aileron
bellcranks and WD-807 Control Column. Attach the aileron pushrod assemblies to the aileron bellcranks with
the hardware depicted in “Side View”, DWG 15A).
Insert the W-818 Pushrod Assemblies into both wings and attach them to the WD-421 Aileron Bellcranks.
Attach the ailerons to the wings (See DWG 13A). Position the ailerons in their neutral position, then adjust the
W-818 Pushrod Assemblies to fit between the aileron and the WD-421 Aileron Bellcranks.
Free the control sticks and check the up and down aileron travel of both ailerons (See Chapter 15 in the Con-
struction Manual). Changing the neutral position of the WD-421 Aileron Bellcranks will change the differential
relationship of the up versus down travel of the ailerons.
Once again, anchor one of the control sticks in the neutral position.
Make the two F-847 Flap Pushrods (See “Flap Pushrod Attachment”, DWG 80).
Use a 12V battery to retract the E-85615-157-1 Linear Actuator Assembly (flap motor) to the flaps up position.
Temporarily disconnect the W-818 Pushrod Assemblies from the ailerons and allow the ailerons to swing down .
Attach the F-847 Flap Pushrods to both flaps (See “Flap Pushrod Attachment”, DWG 80).
Install the flaps on the wings with the hinge pins (See DWG 14A).
RV-8/8A
SECTION 8
THE FUSELAGE
8-76
8s8PP-1 r1 06/23/11
Swing the left flap into its up position while inserting the F-847 Flap Pushrod through the hole in the fuselage
and position it so its trailing edge aligns with the trailing edge of the left aileron. It will be necessary to push
down the leading edge skin on the flap to get it to go under the top skin on the wing. Trim the inboard edge of
the flap top skin as required to clear the fuselage when the flap is in its full up position.
Attach the F-847 Flap Pushrod to the WD-806 Flap Actuator Weldment (See “Flap Pushrod Attachment”, DWG
80). Adjust the length of the flap pushrod so the flap is aligned with the aileron in the neutral position.
Slowly extend the flap motor to lower the flap to the full down position. Monitor the F-847 Flap Pushrod for any
interference with the fuselage as the flap motor is extended. If the flap pushrod interferes with the floor or fuse-
lage skin, use washers to adjust the lateral position of the flap pushrod in the clevis of the WD-806 Flap Actua-
tor Weldment. If necessary, slightly enlarge the holes in the floor and/or fuselage skin.
Repeat the two previous steps for the right flap.
Trim the inboard edge of the bottom skin on both flaps to parallel the F-826-1 or F-827-1 Center Bottom Skins
(See “View E-E Flap Fairing”, DWG 80).
Retract the flap motor to place the flaps in the full up position.
WING ROOT AND FLAP INTERSECTION FAIRINGS
Cleco an F-872APP Fwd Wing Root Fairing to each of the F-872BPP Aft Wing Root Fairings using the match
hole common between the two parts (See “Fwd and Aft Wing Root Fairings”, DWG 80). Align the long, straight,
outboard edge of the two fairings parallel with each other as shown, then draw a line on the aft wing root fairing
along the aft edge of the fwd wing root fairing.
Use a hand seamer to form a slight joggle in the F-872BPP Aft Wing Root Fairings as shown in “Fwd and Aft
Wing Root Fairings”, DWG 80. Be sure to joggle the second aft wing root fairing in the opposite direction to
make a left and right part.
Cleco the F-872BPP Aft Wing Root Fairings in place on the top of the left and right wing using the holes left
open for that purpose (See “Top View”, DWG 17A). Drill out the rivets if they were installed in these holes.
Match-Drill #30 the top wing spar flange on both wings using the match hole at the fwd edge of the F-872BPP
Aft Wing Root Fairings as a guide.
Draw a reference line on the outside surface of the T-701 Tank Leading Edge Skins, 1/4-inch from the inboard
edge. The line is used to center the screw holes that are punched in the F-872APP Fwd Wing Root Fairings on
the tank leading edge skin (Section A-A view, DWG 80).
Cleco the F-872APP Fwd Wing Root Fairings to the F-872BPP Aft Wing Root Fairings and the wing spar flange
using the match hole common to the parts.
Pull the F-872APP Fwd Wing Root Fairings tight around the leading edge of the fuel tanks with the P.P. holes
aligned with the reference line drawn on the T-701 Tank Leading Edge Skins. Mark the approximate location of
the wing leading edge on the fwd wing root fairings..
Form the F-872APP Fwd Wing Root Fairings around a 1-1/2” (approx.) diameter piece of pipe or tubing cen-
tered on the line drawn for the wing leading edge. Form them a little at a time while checking them on the wing
until they closely fit the leading edge.
Cleco the F-872APP Fwd Wing Root Fairings to the F-872BPP Aft Wing Root Fairings. Pull the fwd wing root
fairings tight around the leading edge and cleco the bottom aft most hole in the fairing to the first open screw
hole in the F-826-1 or F-827-1 Center Bottom Skins (the forward most of the screw holes that were located from
the Lower Inboard Wing Skins). Verify that the reference line drawn on both T-701 Tank Leading Edge Skins is
visible in the P.P. holes in the fwd wing root fairings. Also, verify that the fwd wing root fairings fit flush on the
fuel tank by laying a straight edge over them span wise; they are flush to each other when the straight edge is
parallel to both parts.
Match-Drill #30 all the screw holes in the F-872APP Fwd Wing Root Fairings into the T-701 Tank Leading Edge
Skins. Start drilling at the top of the front spar, then work forward and around the bottom towards the rear.
Mark along the F-872APP Fwd Wing Root Fairings and F-872BPP Aft Wing Root Fairings for an even 3/16 gap
between the edge of the fairings and the side of the fuselage.
