l
F.8L Falco Construction Manual
22–7
Revision 4, March 1, 2002
spar. You might as well make a lot of these angle guides so that you will not be slowed
down by a lack of them—12 would be ideal. You should also make two angle guides with
an angle of 98.9° to clamp against the outboard face of the Sta. 2 flap trailing edge rib.
Use the same method shown in Figure 6 and extend the angled line to the right. The
angle guides will also be used to brace the leading edge ribs when sanding for the leading
edge strip. You will need to modify these slightly to clear the channel-nuts.
Note:
For technically minded builders, the aileron/flap spar is installed so that at Sta. 14 it
is 509.1mm forward of its theoretical position at Sta. 1. Thus the angle of the ribs is
determined by the slope of 509.1:3250, 39.16:250 or 15.66:100.
❏
Drill vent holes in the leading edge and trailing edge ribs as shown on the drawings. Note
that not every rib has a vent hole. The position of the vent holes in the ribs and spar is
intended to make it difficult for water to find its way into the leading edge section and to
provide drainage for any moisture that gets into the trailing edge section. The drain holes
along the trailing edge of the ailerons are very important since water or ice in the aileron
trailing edge would increase the risk of aileron flutter—and
that
can lead to inflight
airframe breakup and fatalities.
❏
Mark the 95% chord station on each trailing edge rib as shown on the drawings. These
marks will be used to position the notched strip shown in Figure 5.
❏
Cut the trailing ribs for the trailing edge strip as shown on the drawings.
95%
95%
angle guide
Figure 7
❏
Install the trailing edge ribs on the aileron/flap spar. See Figure 7. Clamp an angle guide
to the spar and each rib to hold the rib at the correct angle. Use the angle guide to set the
angle of the table on a stationary disc/belt sander when you sand the ribs to match the
spar.
Note:
While installing these trailing edge ribs, you may consider using the trailing edge
strip to help align the ribs. For those who care to work to super-precision, Drawing No.
206 provides you with all of the dimensions needed for notching the trailing edge strip.
Once notched, the trailing edge strip will assist in holding the ribs in place.
If you plan to notch the trailing edge strip to match the ribs as installed—rather than
using the dimensions on Drawing No. 206—then it would be best if you work on one rib at
a time. Clamp the rib in position, then fit the trailing edge strip and mark it for notching,
notch it and then go to the next rib. If you install all of the ribs and then work on
marking and notching the trailing edge strip you will have a more difficult time since all
14 ribs will fit into the notches or the trailing edge strip will not fit into place since one rib
can prevent it from mating.
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