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TM
DEHAVILLAND BEAVER 120 ARF
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PHASE 6 – INSTALLING THE
HORIZONTAL AND VERTICAL
STABILIZERS.
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STEP 6.1 – MOUNT THE HORIZON-
TAL STABILIZER.
Locate the horizontal stabilizer assembly in the wing box.
The horizontal stabilizer assembly consists of the one
piece horizontal stabilizer to which the elevators have
been pre-mounted with hinges that have been double
pinned on the under side. Note carefully that the bottom of
the horizontal stabilizer is the side where the hinge pin
heads can be seen.
Remove any shipping spacers from the fuselage slots.
Ensuring that the horizontal stabilizer assembly is top side
up, slide the horizontal stabilizer assembly into the hori-
zontal stabilizer slot in the fuselage. Carefully insert the
horizontal stabilizer assembly all the way into the slot and
center it left to right.
Ensure that the wing is mounted on the fuselage and that
the wing mounting bolts are snug. Ensure that the wing
struts are installed and that the struts are not inducing any
warps or twists in the wing.
Position the horizontal stabilizer assembly so that it is
straight and the tips of the horizontal stabilizer are equidis-
tant from the wing tips.
Carefully position masking tape on the top of the horizon-
tal stabilizer assembly so that the edge of the masking
tape marks where the fuselage meets the horizontal
stabilizer on both sides of the stabilizer.
Carefully remove the horizontal stabilizer assembly from
the slot in the fuselage.
Using a pen, draw a line parallel to and about ¼ in. in-
board from the inboard edges of the masking tape.
Using a sharp knife, carefully cut along the drawn lines
and across the stab so that you can peel up the covering
material and bare the wood in the top center area of the
stab that will be covered by the fuselage tail section. Do
not score the wood. Seal any score lines with Pacer ZAP
CA before proceeding further. If you cut into the wood and
do not subsequently re-glue any score lines, your horizon-
tal stabilizer may fail in flight at any time.
Do not glue the horizontal stabilizer assembly into place in
the fuselage slot at this time.
Locate the two elevator control horn assemblies. The
elevator control horn assemblies each consists of a metal
bolt about 2 in. long, a white plastic beveled washer, a white
plastic T-nut, a metal nut and a white plastic control horn
with a hole in the flange end of the horn. Remove the parts
from the two bolts.
Place a white plastic beveled washer on the bolt so that the
flat side of the beveled washer is against the head of the
bolt. Insert the first bolt into the predrilled hole in the left
elevator working from the top surface of the elevator. From
the underside of the elevator apply a white plastic T-nut to
the bolt such that the shaft of the T-nut is towards the head
of the bolt. Tighten the T-nut so that the shaft of the T-nut
goes into the hole in the elevator. Use a small crescent
wrench to hold the T-nut and a screw driver to turn the head
of the bolt and tighten until the T-nut just begins to seat into
the covering and so that the bevel portion of the beveled
washer has sunk nicely and snugly down into the hole in the
top surface. Ensure that the bolt will now securely move the
left elevator with no slack. Now apply the metal nut to the
bolt and tighten the nut down and just into the white plastic
of the T-nut. Apply Pacer Z-42 thread locker to the metal nut.
Install the white plastic control horn on to the bolt.
Repeat this procedure for the right elevator.
Slide the horizontal stabilizer assembly into the horizontal
stabilizer slot in the fuselage. Carefully insert the horizontal
stabilizer assembly all the way into the slot and center it left
to right using the masking tape as a guide.
Tape the elevators into their neutral positions.
Using the wing as a reference, and looking back along the
fuselage from the front, ensure that the horizontal stabilizer
assembly is level with respect to the wing. If adjustment is
required, sand the horizontal stabilizer slot in the fuselage.
Sand carefully and check frequently for progress. Do any
sanding in small incremental steps, checking the alignment
with respect to the wing frequently.
With the elevators taped into their neutral positions and the
horizontal stabilizer assembly fully inserted into the horizon-
tal stabilizer slot in the fuselage adjust the clevises on the
elevator control rods to connect to the elevator control
horns.
Mix up about 2 ounces of Pacer 30 Minute Zpoxy and
thoroughly apply the mixed Zpoxy to the bare wood area on
the top of the horizontal stabilizer assembly. Apply the mixed
Zpoxy to the top surface of the horizontal stabilizer slot in
the fuselage. Carefully slide the horizontal stabilizer into the
slot and push the horizontal stabilizer all the into the slot and
center it left to right using the masking tape as a guide.
Using the wing as a reference, and looking back along the
fuselage from the front, ensure that the horizontal stabilizer
assembly is level with respect to the wing. Wipe away any
excess adhesive immediately. Pin the assembly into place to
hold it securely until the Zpoxy cures. Allow at least 2 hours
for curing and do not fly the model for at least 24 hours.
Remove the masking tape applied earlier.
