Great Planes Piper J-3 Cub 60 Kit - GPMA0162 - Manual (Page 12)

D 1 Cut the hinges from the supplied 2" x 9" composite
hinge material You will need six hinges for the elevator
and three for the rudder Store the remaining hinges for
use later during construction.
D 2 Use the plan as a guide to lightly mark the locations
of the hinges Refer to the Expert Tip that follows, then cut
matching hinge slots in all four parts.
the slot If the hinge does not slide in easily, work the
knife blade back and forth in the slot a few times to
provide more clearance (it is really the back edge of the
blade that does the work here in widening the slot).
Expert tip for using CA hinges
The hinge material supplied in this kit consists of a
3-layer lamination of mylar and polyester It is specially
made for the purpose of hinging model airplane control
surfaces Properly installed, this type of hinge provides
the best combination of strength, durability and ease of
installation We trust even our best show models to these
hinges, but it is essential to install them correctly
Please follow the instructions carefully to obtain the best
results These instructions may be used to effectively
install any of the various brands of CA hinges.
The most common mistake made by modelers when
permanently installing this type of hinge is not applying a
sufficient amount of glue to fully secure the hinge over its
entire surface area, or, the hinge slots are very tight,
restricting the flow of CA to the back of the hinges This
results in hinges that are only "tack glued" approximately
1/8" to 1/4" into the hinge slots The following technique
has been developed to help ensure thorough and
secure gluing.
A. Cut the hinge slot using a #11 blade in a standard #1
knife handle The CA hinges provided have a thickness
that fits this type of slot very well Trial fit the hinge into
B Drill a 3/32" hole, 1/2" deep, in the center of the
hinge slot. If you use a Dremel Moto-TooF for this task,
it will result in a cleaner hole than if you use a slower
speed power or hand drill Drilling the hole will twist
some of the wood fibers into the slot, making it difficult to
insert the hinge so you should reinsert the knife blade,
working it back and forth a few times to clean out the
slot.
C Trial fit the hinges into the slots and, without using
any glue, temporarily attach the control surface, to verify
the fit.
STOP! DO NOT GLUE THE HINGES IN PLACE UNTIL
AFTER THE MODEL IS COVERED!
D 3 Bevel the leading edges of the elevator and rudder
Draw the "bevel to" lines on the leading edges of the
elevators and the rudder Refer to the plan for the
correct angle.
D 4. Carve or sand the bevel on the leading edges of the
rudder and elevators A razor plane allows you to rough-in
the bevel before finishing with a sanding block
D 5 Reinstall the hinges and test fit the operation of the
rudder and the elevators Make adjustments in the hinge
slots if necessary Now would be a good time to designate
a top and bottom of the elevators and stabilizer - just in
case one side looks a little better than the other
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