User Manual

❏❏2. Thread a 4-40 nut and a 4-40 metal clevis to
the other end of the pushrod. Connect the pushrod to the aileron servo arm and to a large control horn. Position the horn on the aileron directly behind the arm. The base of the horn should be set back from the trailing edge of the wing 1/4" [6mm]. Drill 3/32" [2.4mm] holes into the aileron for the horn. Mount the horn with four #2 x 1/2" [13mm] screws. Adjust the length of the pushrod by turning the clevis so the aileron will be neutral when the servo is centered (this will be fine-tuned later when setting up the radio, so there is no need to tighten the 4-40 nut to the clevis until then).
❏❏3. Hook up the flap the same way. Note that the
flap is retracted (“up”) when the servo arm is rotated aft (not when the servo arm is centered). Be certain the control horn is set back far enough so it will not contact the wing at full flap deflection.
❏❏4. One last IMPORTANT step; remove the screws
from both servo hatches and both control horns. Add a few drops of thin CA to all the holes, allow to fully harden. Remount the hatches and horns.
❏ 5. Mount the hatches and hook up the aileron and flap on the right wing the same way.
Mount the retracts Install the left retract first. ❏❏R1. The same as the covering was cut from the
aileron hatches, cut the covering from the landing gear opening 1/4" [5mm] inside the edges all the way around the opening. Use a trim iron to iron down the covering.
❏❏R2. Enlarge the hole in the Du-Bro 5" [127mm]
wheels (not included) with a size “F” [6.5mm] (or 17/64" [6.8mm]), drill (size F will provide the best fit, but a 17/64" hole is suitable).
❏❏R3. Cut the 1/4-20 bolts that come with the
Robart retracts to a length of 1-3/4" [45mm]. Slip the
washer followed by the wheel and a nut onto the bolt. Add a small drop of threadlocker to the nut, then tighten the assembly to the retract strut, simultaneously adjusting the spacing of the nut so the wheel will roll freely.
❏❏R4. Test fit the retract unit with the wheel into the wing. Position the retract so the wheel is centered in the wheel well. It will probably be necessary to raise the strut into the retract body approximately 1/8" [3mm] to achieve the correct spacing all the way around.
Note: Steps with an “R” are for mounting retracts. Steps with an “F” are for mounting the included fixed landing gear. The fixed gear will not be installed until after the wings have been joined. If mounting the fixed landing gear proceed to “Join the wings” on page 16.
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