Sequoia Aircraft Corporation F.8L Falco, Construction Manual

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F.8L Falco Construction Manual 19-2 Revision 4, March 1, 2002
Figure 2
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Place the main stabilizer spar in the jig table, forward face up, and level the spar. It is
imperative that the spar remain straight during the assembly process to insure that the
hinges on the stabilizer will remain aligned with the elevator hinges. Since you will be
clamping the ribs to the spar, it will be best if you place the spar near the edge of the jig
table, or use 20x20 extensions from the table.
Figure 3
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Fit the intermediate ribs for Sta. 3, P/N 405-2, to the main spar. See Figure 3. Clamp in
place.
Note: In the following steps, you will be looping a string over these ribs to align the
inboard ribs as shown in Figure 5 and 7. Since the tension of the string will pull the ribs
over, we suggest you make a wood brace to hold the rib at the proper vertical position.
Since the forward face of the main stabilizer spar is tapered, you cannot use a carpenter's
square against the forward face to align the ribs since this would result in the ribs tilting
outboard. A combination square could be set to the correct angle. A plumb bob or
carpenter's level might be used for the vertical alignment of the ribs.
Figure 4
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Trial fit the forward stabilizer spar. See Figure 4. Check to make sure that the forward
face of the forward stabilizer spar is 350mm from the aft face of the main stabilizer spar.