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S S t t a a g g e e 4 4 : : B B u u i i l l d d i i n n g g t t h h e e E E m m p p e e n n n n a a g g e e
S S t t a a g g e e 4 4 : : B B u u i i l l d d i i n n g g t t h h e e E E m m p p e e n n n n a a g g e e
As you did with the ailerons on the lower wing, the horizontal stabilizer and the ver-
tical stabilizer (or fin) will be built with the elevator and the rudder attached and then
cut loose. Reference Figures 4/1 through 4/5 while you construct them on full-size
Plan D02.
PARTS LIST FOR STAGE 4:
WP3673-24
Leading edge brace
WP3680-24
Diagonal brace
WP3688-24
Fin attachment supports
WP40264
Elevator pivot rod
WP40264
Rudder pivot rod
WP3202-40
Stabilizer rim (laminated)
WP1860
Hinges
WP3631-24
Stabilizer & elevator spars 2 1/8 x 1/8 wood strips ñ special prep
WP3660-24
Elevator brace
WP3673-24
Fin braces
WP3688-24
Ribs
Ni28-062
Control horns
WP3202-40
Rudder rim (laminated)
WP3673-24
Vertical brace
WP3660-24
Vertical brace
WP3631-24
Rudder post & main spar
J006
Stabilizer/elevator jig
J007
Fin/rudder jig
Stabilizer and elevator:
This one is the real test of your bent lamination skill. The stabilizer rim is a continu-
ous lamination that runs completely around both the stabilizer and the elevator. This ulti-
mately will give you the leading edge of the stabilizer and the trailing edge of the ele-
vator. Laminate the stabilizer rim using five Tanganyika wood strips(WP3202-40)
against jig J006 to form the correct shape. Make sure the glue is completely dry before
you unpin the shape from the jig.
Cut to length and glue in the stabilizer and elevator spars using 3x3mm wood
strips(WP3631-24). These require special preparation before attaching. One face must
be grooved into a shallow ìCî channel that will locate the pivot rod(WP40264) when the
grooved sides face each other. See Plan D02. The easiest way to cut the groove is to
score it the length of the strip with a razor saw, then to file the channel with a round rif-
fler. The angle of the file end of a riffler to the center handle makes it easier to keep your
hand out of the way. It is important that the pivot rod not be completely enclosed when
sandwiched between these spars, otherwise the elevator will not operate.
The elevator brace is made from 1x3mm wood strip(WP3660-24), the fin braces and
the leading edge brace from 2x2mm wood strip(WP3673-24). Next add wood
strips(WP3688-24) to create the topside ribs in an airfoil contour. Turn the assembly
over and glue on the underside ribs, then add the two fin attachment supports from wood
strips(WP3688-24). When all is dry, saw through the rim and ribs where indicated in
Figure 4/3 to separate the elevator from the stabilizer.
Referring to full-size Plan D02 and Figure 4/4, cut four dadoes into the elevator spar
to clear the outside of the elevator hinges. Next, glue the elevator pivot rod(WP40264)
into the groove of the elevator spar. Locate and attach the control horn(Ni28-062) to the
2 5/64 x 5/64 wood strips
2 3/64 x 3/64 wood strips
2 .02 x 5/64 wood strips
1 5/64 x 5 1/2 brass rod
1 5/64 x 2 1/4 brass rod
5 .02 x 5/32 Tanganyika wood strips
6 1/4" aluminum tape strips
1 3/64 x 1/8 wood strip
2 5/64 x 5/64 wood strips
14 .02 x 5/64 wood strips
2 Britannia metal
5 .02 x 5/32 Tanganyika wood strips
1 5/64 x 5/64 wood strip
1 3/64 x 1/8 wood strip
2 1/8 x 1/8 wood strips ñ special prep
1 laser-cut wood part 5/32 thick
1 laser-cut wood part 5/32 thick
19
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center of the elevator leading edge.
Finally, cut the indicated lengths from the
1/4" aluminum tape(WP1860). Carefully
fold the strip lengthwise in half, adhesive
side inside, then trim to 3/16" wide and
bend the hinges. They pass through the
slot created by gluing the pivot rod to the
elevator spar and are glued around the sta-
bilizer spar only.
Fin and rudder:
The procedure for constructing the fin
and rudder is essentially the same as for
the stabilizer and elevator. Especial care
must be taken in building the fin because
the elevator control horn must later be
located within this structure.
Begin by forming the rim from five
wood strips(WP3202-40) around jig J007.
Prepare the rudder post and main
spar(WP3631-24) with a groove, as you
did for the stabilizer and elevator spars.
Glue these in place, making sure the
grooves face each other. Make the leading
edge brace from WP3673-24, vertical
braces from WP3673-24 and WP3660-24
as indicated, and diagonal braces from
WP3680-24. Complete this step by
adding the ribs from WP3688-241 to
achieve a like curvature on both sides.
Note how the ribs are paired on both sides
of the horizontal joint between the fin and
the rudder (Plan D02).
Referring to full-size Plan D02, saw the
rudder from the fin and cut two dadoes
into the rudder spar. Attach the rudder
pivot rod(WP40264) to the rudder spar
and make hinges from the aluminum
tape(WP1860) the same way you did for
the elevator. Finally, locate and attach the
control horn(Ni28-062) to the rudder.
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