GREAT PLANES Rapture 40 Instruction Manual page 9

2. Mark the locations of the hinge slots on the fin and
rudder where shown on the plan.
3. Use a Great Planes Slot Machine to cut hinge slots on
the centerlines at the marks. If you do not have a Slot
Machine, use a #11 hobby blade to cut the hinge slots. Start
by making a small slit. Then, working in small increments, go
a little deeper moving the blade back and forth. Note that it's
the back of the blade that does the work.
4. Cut three 3/4" x 1" [19 x 25mm] CA hinges from the
supplied 2" x 9" [50 x 230mm] CA hinge strip. Snip off the
corners so they go in easier.
5. Test fit the rudder to the fin with the hinges. Make
adjustments where necessary for a good fit. Hint: Now that
the rudder and fin are together (temporarily), this would be
the perfect opportunity to align the tip of the fin and rudder
by sanding them to match each other.
6. Using the centerline as a guide, refer to the plan to get
the correct angle, then shape the leading edge of the rudder
to a "V." The best tool for this is the Master Airscrew razor
plane (MASR1510). If you don't have a razor plane a bar
sander with 80-grit sandpaper can be used instead. The "V"
doesn't have to be sharp, but make certain you can get 1"
[25mm] of both right and left rudder throw.
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