Sequoia Aircraft Corporation F.8L Falco, Construction Manual

Page: 257 / 423

l
F.8L Falco Construction Manual 24–28 Revision 4, March 1, 2002
❏
Scarf this upper wing skin for the next inboard and next outboard skins. If you wish, for
this and all subsequent skins, you may install the skin and
then scarf the plywood.
❏
Bend the leading edge for the upper wing skin between Sta. 1 and 6.
❏
With this upper wing skin clamped in place, install two small nails as alignment pins so
that the skin may be glued in place accurately.
❏
Trace the outline of the ribs and spars on the inside surface of the skin for varnishing.
❏
Draw the internal structure of the wing on the outside of the skin to assist in nailing or
stapling when the skin is installed.
❏
Fit the lower wing skin for Sta. 1 to Sta. 6. This will require a 50”x50” piece of 2mm birch
plywood. An extra piece of plywood at the trailing edge must be scarfed and glued to the
skin before it is installed. This extra piece may be installed with the grain direction fore-
and-aft for slightly greater strength of the wing walk.
Note: You should not cut out the wheel well opening and landing gear access door until
the skin is glued in place. This will apply to all access panels and openings. The reason
for this is that the skin will not be smooth around the opening otherwise. Builders who
have cut access doors in the skin first have found that the skin would be “flat” around the
opening and would not be the proper wing contour.
❏
Scarf the lower wing skin for the next inboard and next outboard skins.
❏
Bend the leading edge for the lower wing skin between Sta. 1 and 6.
❏
Draw the internal structure of the wing on the outside of the skin to assist in nailing or
stapling when the skin is installed.
❏
Measure the location of the center of the jack pad fitting so that you will be able to locate
this after the skin is glued in place. The aft face of the spar will be easy to find by using a
long straightedge, but you will need to mark an offset—such as a point exactly 500mm
outboard of the center of the hole you must drill.
❏
Varnish the interior of the entire wing from the outboard face of wing Sta. 1 outboard
except for those areas to be glued.
Note: After the bottom wing skins are installed, you will varnish the inside of the skins, so
you may concentrate your varnishing efforts at this point on those areas which are most
easily reached from the bottom of the wing. You must varnish under all fittings at this
point. Be careful to varnish the holes in the main wing spar and front wing spar for the
landing gear leg. This is very important as grease will be allowed to enter these openings.
❏
Mask and varnish the inside surface of the upper wing skin between Sta. 1 and 6.
Note: On the upper wing skin, the landing gear bay and access area between Sta. 2 and 2-
1/2 does not need to be varnished at this time since it will be accessible later.