User Manual

wrinkles. The best way is to glide the iron over the
covering until the wrinkles disappear, then go over the
area again, pushing down on the iron to bond the
covering to the wood. If the wrinkles don’t go away, the
balsa in that area may be bending inward. If this is
happening, don’t press down. Simply let the heat of the
iron shrink the covering. If the wrinkles momentarily
disappear, then immediately reappear, the iron may be
too hot, thus causing air bubbles. Lower the
temperature of the iron or use a sharp #11 blade to
puncture several holes in the covering, then reheat.The
suggested iron temperature is around 360 degrees F.
❏❏4. Cut the covering from the holes for the hinge
points in the trailing edge of the wing and the leading
edge of the flap and aileron.There are three holes for
the aileron and four holes for the flap. Note that the
holes in the flap and aileron are elongated.
❏❏5. Shorten one of the pinned hinge points by
cutting the last segment off one end. This hinge will
be for the outermost hole in the aileron.
❏❏6. Without using any glue, install three hinges into
the aileron. The one shortened in the previous step
goes in the hole nearest the outer tip. Note that the
pivot point of each hinge must align with the center of
the radius on the leading edge. To achieve this
alignment the hinges will be fairly deep in the aileron.
Also note that the hinges must be perpendicular to the
leading edge. If necessary, use an electric drill to run a
3/16" [4.8mm] drill bit into the holes to achieve this
alignment. Be careful not to drill through the sheeting
over the top and bottom of the aileron.
❏❏7. Again without glue, test fit the aileron to the
wing. Move it up and down a few times to align the
hinges—it doesn’t have to move very far—only 3/4"
[19mm] up and 3/4" [19mm] down (measured at the
widest part of the aileron at the trailing edge as shown
in the photo). If there is too much resistance, or if you
are not able to move the aileron up and down 3/4"
[19mm], widen the gap between the aileron and the
wing by pulling the aileron from the wing slightly, or
enlarge the hinge openings in the aileron.
❏❏8. Still using no glue, test fit the flap to the wing
the same way. 2-1/8" [55mm] of down deflection is
required (measured at the widest part of the flap).
We’ll glue on the flap and aileron separately.This
way you will have plenty of working time for
the epoxy.
❏❏9. Remove all the hinges. Add a small drop of
oil to the pivot point on the aileron hinges.
3/4"
3/4"
HINGE PIVOT POINT
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