Sequoia Aircraft Corporation F.8L Falco, Construction Manual

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F.8L Falco Construction Manual 23–10 Revision 4, March 1, 2002
Figure 11
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Install P/N 520-2 on the aft face of the main wing spar at the aircraft centerline. See
Drawing No. 102. Note that the upper bolt holes are located 18mm below the top of the
spar. This will require that the spar be sanded slightly for the bearing housing on the
forward face of P/N 520-2.
Note: Many builders worry about drilling the two upper holes through the upper spar cap.
These holes were taken into consideration when the Falco was designed. Spruce is much
stronger in tension than in compression, and this is the reason that the upper spar cap is so
much larger in cross-section than the lower spar cap. The steel bolts will take the
compression loads in the upper spar just as well as the wood.
These three holes should be drilled on a drill press. If the bolts are parallel, P/N 520-2 will
be easy to remove from the bolts. If the bolts are skewed slightly, the gearbox housing will
be difficult to remove, requiring the bolts be pushed forward in the airplane. This is quite
difficult when all floor boards are installed.
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Install the blocks of spruce for the jack pad/tie down fitting on the aft face of the main
wing spar as shown in Detail C of Drawing No. 201.
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For “open air” wheel well installation—install the four saddle gussets for the 30x15 seat
track supports on the aft face of the main wing spar. See Figure 11. The locations for the
seat track supports are shown at fuselage frame No. 5 on Drawing No. 310, and these same
dimensions are used for the aft face of the main wing spar. The exact dimensions for these
saddle gussets are not shown—make them 60x30 from solid spruce or 6mm thick plywood
and glue several pieces of plywood together to get the desired thickness. Drawing No. 102
also shows a good view of these gussets.