Top Flite TOPA0410 - Manual (Page 29)

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❏ 4. Install a high torque rudder servo in the radio tray.
Connect the rudder servo and battery to the receiver,
switch on the radio system and center the servo arm.
Thread a 4-40 metal clevis onto a 4-40 x 36" threaded
pushrod. Insert the pushrod into the rudder outer pushrod
tube and connect the clevis to the servo arm on the
rudder servo.
❏ 5. Position the rudder torque rod so that the unthreaded
arm is aligned with the centerline of the fuse. Mark the
rudder pushrod at the solder clevis. Remove and cut the
rudder pushrod to the appropriate length.
❏ 6. Solder the solder clevis onto the end of the rudder
pushrod with silver solder.
HOW TO ACHIEVE A GOOD SOLDER JOINT
❏ A. Roughen the area to be soldered with fine sandpaper.
Thoroughly clean the area with rubbing alcohol.
❏ B. Assemble the items to be soldered.
❏ C. Apply a small drop of solder flux to the joint.
❏ D. Heat the area to be soldered. Apply solder to the
heated area. The metal must get hot enough to melt
the solder and the solder must flow into the joint. Do
not melt the solder by touching it to the soldering iron.
❏ E. Do not move the parts until the solder has cooled.
❏ F. Clean off the excess flux with isopropyl alcohol.
❏ G. Test the joint by pulling on it.
❏ 7. Remove the 4-40 threaded metal clevis and slide a
silicone retainer over the solder clevis. Insert the rudder
pushrod into the rudder outer pushrod tube from the aft
end of the fuse. Attach the solder clevis to the rudder
torque rod and slide the silicone retainer over the clevis.
Remove the rudder servo.
❏ 8. Use 30-minute epoxy to glue the die-cut 1/8" [3.2mm]
plywood lower fuse crutch doublers (LFCD) to the inside
of both die-cut 1/8" [3.2mm] plywood lower fuse crutches
(LFC). Align the notches and the wing saddle. Be sure to
make a left and a right lower fuse crutch assembly.
❏ 9. Use 6-minute epoxy to glue the die-cut 1/8" [3.2mm]
plywood wing bolt plate tripler (WBPT) to the inside of
both lower fuse crutch doublers.
❏ 10. Use 6-minute epoxy to glue the die-cut 1/8" [3.2mm]
plywood former F-3C to the front of the former F-3B. After
the epoxy cures, drill two 5/16" [7.9mm] holes through
F-3C using the holes in F-3B as guides.