l
F.8L Falco Construction Manual
21–2
Revision 4, March 1, 2002
them in place and then cut off the excess. These strips are shown on Drawings No. 413
and 415, which are very accurately drawn. Thus, we suggest that you take the necessary
measurements from these drawings. See Figure 2, Chapter 19.
Figure 2
❏
Join the main fin spar to the main stabilizer spar, but do not glue at this time. See Figure
2. The bolts for the stabilizer hinges will hold things in place.
Note:
Remember to install the stabilizer with the trim tab cable tube on the right side of
the aircraft and with the hole in the forward stabilizer spar on the upper side. (By “upper
side” we are referring to its installed location in the airplane. If confused, see Drawing No.
410, Section B-B.)
❏
Place the main fin spar, forward face up, on the edge of the jig table with the stabilizer
across the jig table. 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. Use a
water level to level the main fin spar. Use a water level to make sure that the stabilizer is
level, block and clamp in place. Make sure that the stabilizer chord line is exactly vertical.
For this you can use a plumb bob to check the centerlines of the stabilizer Sta. 1 ribs. You
can use two wood blocks clamped to the forward and main stabilizers, say 100mm long, to
make an offset of the rib centerline, and hang a plumb bob from the upper block. As with
the stabilizer ribs, you have to be careful not to use a carpenter's square to set the vertical
alignment of the ribs due to the taper of the spar. Use a plumb bob, carpenter's level or
combination square.
❏
If not already done, drill holes required in the intermediate ribs at Sta. 2 and 3 for the
COM antenna coaxial cable (see Drawing No. 411 and 413). If you are going to install a
Loran antenna on the forward face of the main fin spar, you should run this wire now. You
may drill some holes in the ribs for this wire, but if the wire is small, a small groove may be
cut in the braces of the spar.
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