Sequoia Aircraft Corporation F.8L Falco, Construction Manual

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F.8L Falco Construction Manual 18–8 Revision 4, March 1, 2002
plywood. This can be sanded with a drum sander in an electric drill (work very carefully!)
and finished off with a sanding block.
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Turn the elevator over, and fit the 2mm skin over the trailing edge inboard of Sta. 1. The
plywood must be soaked in water and bent. Do not attempt to cut the scarf on the
plywood until it is bent. See Figure 12.
Figure 12
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After the plywood is bent, scarf the plywood on the inside to match the scarf on the
leading edge skins. This is most easily done with a drum sander in an electric drill and
finished off with a sanding block. If you have put a piece of plywood on the top and
bottom of the spar for an uninterrupted scarf joint, then you may omit the inside scarf on
the 2mm skin, and feather the plywood after it is glued in place.
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Mask the interior of the skin for varnishing. You should also draw the internal structure
on the outside of the skin for stapling or nailing at installation.
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Glue this 2mm skin in place. Scuff sand the plywood prior to gluing.
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Glue the 10x15 spruce strips that go from B.L. 70 to the trailing edge strip. Scuff sand the
plywood prior to gluing.
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Cut and fit the four trailing edge skins for the elevator. These will go from Sta. 1 to the tip
of the elevator. Leave extra material on the tip for bending. See Figure 13.
Figure 13
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Scarf the skins along the forward edge to match the scarf of the leading edge skin on the
spar. Scarf the outside of the skin along the rib at Sta. 1.
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Soak the outboard ends of the skins in water, then clamp a skin in position and bend the
tip down over the tip bow. Use a steam iron and the same method used on the leading
edge tip skins. Repeat this process for all four trailing edge skins.
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Use alignment pins for the upper skins and mask the inside for varnishing. Draw the
internal structure on the outside of the skin for stapling or nailing during the skinning
process.