Great Planes Gee Bee Profile 40 Kit - GPMA0485 - Manual (Page 18)

D 1. Starting with the elevators and stab, cut the covering
from the hinge slots
INSTALLING 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 read the
following instructions and follow them 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
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 o f 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.
Drill a 3/32" hole, 1/2" deep, in the center of the hinge slot
If you use a Dremel MultiPro" for this task, it will result in a
cleaner hole than if you use a slower speed 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.
It is best to leave a very slight hinge gap, rather than
closing it up tight, to help prevent the CA from wicking
along the hinge line Make sure the control surfaces will
deflect to the recommended throws without binding If you
have cut your hinge slots too deep, the hinges may slide in
too far, leaving only a small portion of the hinge in the
control surface To avoid this, you may insert a small pin
through the center of each hinge before installing This pin
will keep the hinge centered while you install the control
surfaces
D 2 Clean the elevator joiner wire with alcohol and a
paper towel to remove any oil residue
D 3. Glue the joiner wire in the elevators with 6-minute
epoxy Before the epoxy cures, tape a flat stick to the left
and right side of the stab and to the elevators This will
ensure that both elevators are even.
ASSEMBLE THEN APPLY 6 DROPS
OF THIN CA TO CENTER
OF HINGE ON BOTH SIDES
D 4. Apply 6 drops of thin CA adhesive to both sides of
each hinge Allow a few seconds between drops for the CA
to wick into the slot.
D 5 Install the ailerons with their hinges repeating the
gluing technique described previously.
D 6 Cut a slot in the TE of the fin for the tailwheel bracket
nylon bearing.
D 7 Lightly coat the tailwheel wire with petroleum jelly
where it enters the nylon bearing This will prevent the wire
from becoming glued to the bearing
D 8 Pack the tailwheel bracket hole in the rudder and the
slot in the TE of the fin with 30 minute epoxy Install the
rudder with its hinges Repeat the gluing technique
described previously and allow the epoxy to cure.
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