Top Flite TOPA0405 - Manual (Page 47)

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5. Position the servos on the hatches so that
the servo arms are centered in the hatch openings.
Use 30-minute epoxy to glue 5/16" x 3/4" x 7/8"
basswood servo mounting blocks to the
servo hatches.
NOTE: Secure the servo mounting blocks by first
drilling several 1/16" holes about 3/16" deep into the
gluing surface of the basswood blocks. Roughen
the servo hatch where the epoxy will be applied.
Pack epoxy into the 1/16" holes before clamping the
blocks in position.
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6. After the epoxy has fully cured, insert a 1/32"
or 1/16" temporary shim between the servo and the
plywood hatch. Drill 1/16" pilot holes and mount the
servos to the mounting blocks. Remove the shims.
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7. If you are using a four arm “cross” servo
horn, trim off three of the four arms. Reinstall the
servo hatches in the wing.
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8. Thread a 4-40 nut onto each of four 4-40 x
12" threaded rods. Slide a silicone clevis retainer
onto each rod followed by a 4-40 threaded metal
clevis threaded on at least 14 turns.
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9. Attach a heavy-duty control horn (not
included) to each clevis. With the pushrods aligned
with the servo arms, position the control horns on
the ailerons and flaps so that the clevis holes are
aligned with the LE of the control surfaces. Mark the
control horn mounting holes. Depending on the type
of control horns used, drill the proper size pilot holes
at the marks and mount the control horns to the
control surfaces with 1/2" long wood screws (not
included). Be careful not to drill through the top skin.
Remove the control horns and prick a few holes into
the wood under the control horn. Apply several
drops of thin CA to the pin holes to strengthen the
balsa. After the CA cures, sand smooth and
reattach the control horns.
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10. Attach solder clevises to the outermost hole
in the servo arms. Center the servo arms, ailerons
and flaps. Cut the pushrods to the appropriate
length. Remove the pushrods and solder clevises
from the wing. Solder the clevises onto one
end of each pushrod. Silver solder is highly
recommended. Slide a silicone retainer over the
solder clevises and reinstall the pushrods on the
servo arms and control horns.
INSTALL THE
RUDDER PUSHROD
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1. Thread a 4-40 nut, a silicone retainer and
4-40 threaded clevis 14 turns onto the end of a
4-40 x 36" threaded pushrod. Attach a heavy-duty
control horn (not included) to the clevis and
position it on the rudder so that the clevis holes are
aligned with the hinge line. Mark the outline of the
rudder horn.
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2. Center the shaped 1/8" x 1" x 1" plywood
rudder horn base over the outline of the rudder
control horn. Mark the outline of the plywood
rudder base. Remove the balsa from inside the
outline of the rudder base until it is flush with the
side of the rudder.
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3. Drill four or five 1/8" diameter holes in the
balsa under the rudder base. This will provide
more gluing surface to hold the rudder base
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