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TM
DEHAVILLAND BEAVER 120 ARF
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PHASE 4 – INSTALLING THE
RUDDER & ELEVATOR SERVOS.
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STEP 4.1 – GETTING ORIENTED.
Position the fuselage upright in front of you with the front
of the fuselage to your right and the tail to your left.
Look into the “cargo bay” area from above and you will
note two servo trays and four control rod assemblies. The
control rod assemblies run from the rear of the fuselage
forward into the cargo bay area. Note that the left most
control rod furthest from you consists of two control rods
that are merged into one by a coupler.
The left most control rod assembly connects to the right
side of the rudder and to the tail wheel assembly.
The control rod that lies just left of center in the cargo bay
connects to the right elevator.
The control rod that lies just to the right of center connects
to the left elevator
The right most control rod that lies closest to you con-
nects to the left side of the rudder.
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STEP 4.2 – SET UP SERVO TRAYS.
For shipping purposes, two universal servo trays were
tacked into place within the cargo bay. Remove the
universal servo trays and then remove the plastic bags
and hardware from the universal servo trays.
Apply the black plastic slider plates to the universal
servo trays using the small screws. Leave the sliders
slightly loose for now.
Re-install the universal servo trays.
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STEP 4.3 – CONNECT THE RUDDER
AND ELEVATOR SERVOS
Install two elevator servos and two rudder servos in the
universal servo trays. Use servos having at least 40
ounces of torque. Orient the servos such that they align
correctly with the appropriate rudder and elevator rods.
Center the servos and connect the rods to the servo arms.
Join the leads of the two rudder servos together using one
of the Y-Harnesses.
Join the leads of the two elevator servos together using
one of the Y-Harnesses.
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PHASE 5 – INSTALLING THE
WING STRUTS.
The wing struts must be used when flying this model. The
wing will break if you attempt to fly this model without the
wing struts.
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STEP 5.2 – TRIAL FIT THE SCREWS
INTO THE PRE-DRILLED HOLES.
Locate 8 flat head sheet metal screws (about ½” long) and
8 flat washers in the miscellaneous parts bag. These
screws and washers are used to attach the struts to the
fuselage and the wing.
Trial tap the strut mounting screws into the pre-drilled
holes in the fuselage sides and the bottom of the wing and
then back the screws out and set them aside.
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STEP 5.3 – MOUNT THE WING
STRUTS.
Mount the wing on the fuselage and bolt it down using the
two white plastic wing bolts from the wing parts bag.
Back off the two main wing mounting bolts a turn or two so
that a playing or business card can be inserted between the
trailing edge of the wing and the rear of the wing saddle.
Mount the wing struts using the wing strut mounting screws.
Now re-tighten the two main wing mounting bolts.
Check that the wing is correctly positioned and that both
sides of the wing have similar dihedral as you move out-
board from the center of the wing towards the tips. The two
wing halves should look the same when examined from the
front, rear, top and bottom. The purpose of the wing struts is
to make the wing very strong, not to warp or twist the wing.
Ensure that there are no warps or twists induced by the
struts. Ensure that the wing tips are equidistant from a
common point near the tip of the tail of the fuselage.
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STEP 5.1 - BECOME FAMILIAR WITH
THE WING STRUTS..
Locate the two wing struts that were removed from the
fuselage earlier. The struts have pre-installed white plastic
mounting brackets on each end. One bracket is angled at
about 60 degrees and the second bracket is angled at
about 30 degrees.
The 60 degree bracket attaches to the fuselage, the 30
degree bracket attaches to the underside of the wing.
Locate the pre-drilled mounting holes on the fuselage sides
outboard from the large internal landing gear blocks. Locate
the pre-drilled mounting holes on the bottom of the wing
