4
critical for achieving a good result! The iron should be set to about
220
O
F - 250
O
F (104
O
C - 121
O
C) as measured on the bottom of the iron
using a thermometer. If you do not have a thermometer, you can find
the correct temperature by trial and error. Set your iron to a medium
setting. Glide the iron over some of the covering that is over solid
wood, such as the sheeted wing center section. Observe the covering
to see if any bubbles appear. If bubbles appear, the covering is getting
too hot! Turn down the temperature of the iron and repeat the test.
If no bubbles appear, turn up the heat slightly and repeat the test. Keep
adjusting until you “zero in” on the correct temperature. Find the
temperature that will get the covering to stick down without forming
bubbles or causing the seams to pull away.
Once your iron is set to the correct temperature, go over the entire
framework of the airplane, making sure that the covering is securely
bonded to the structure everywhere the covering comes in contact
with the wood underneath. This takes some time, but is worth the
effort.
After you have all the covering secured onto the solid areas, turn the
temperature of the iron up to approximately 300
O
F - 320
O
F (149
O
C -
160
O
C). This is the correct temperature for shrinking the covering
material.
Use the iron to tighten up any wrinkles in the “open” areas of the model
(no wood underneath the covering). Glide the iron over the wrinkle for
a few seconds, then remove. Repeat until the covering is tight with no
wrinkles.
If wrinkles keep coming back on the tail surfaces, you may need to
“ventilate” the areas between the ribs. Otherwise the air that is sealed
in those relatively small areas will expand when the heat is applied and
actually cause the covering to stretch instead of shrink. Use a pin to
poke a tiny hole in the covering between each rib, on the bottom of the
part. That will let the expanding air escape and the covering to shrink
properly.
Caution When Using Heat Guns:
You can also use a hobby-type heat gun to shrink the covering, but
you must be careful around seams or color joints. Getting too much
heat on the seams may cause them to "creep" or come loose. You
must also be careful when using a heat gun when working around
the windshield and side windows – heat will distort the clear plastic
material.
Recommended Temperatures:
To adhere the covering - 220
O
F - 250
O
F (104
O
C - 121
O
C)
To shrink the covering - 300
O
F - 320
O
F (149
O
C - 160
O
C) NOTE: In
this manual, any references to right or left, refer to your right or left
as if you were seated in the cockpit of the airplane.
WING ASSEMBLY
The wing is designed as a 2-piece system, with separate right and left
wing panels joined by an aluminum tube wing joiner and four nylon
wing bolts (Two nylon wing bolts per wing panel).
To help protect your wings during the following steps we recommend
that you cover your work surface with a soft cloth or piece of foam.
INSTALLING THE AILERON SERVOS
For the following steps you will need:
(1) Right Wing Panel
(1) Left Wing Panel
(1) Aluminum Tube Wing Joiner
(2) Servos with Mounting Screws (not furnished)
(2) 6” Servo Extension Wires (not furnished)
❑
1) Mount the aileron servos in the bottom of each wing panel.
a)
The servo bays are precut for you but you’ll want to double
check the covering around the cutout to make sure it is
sealed down tight.
b)
Install the rubber grommets and brass eyelets (supplied with
your radio system) into each aileron servo.
c)
Install a 1-1/2” servo arm on each of the two aileron servos. The
arm should be at 90 degrees to the servo when the aileron
control stick on the transmitter is in neutral and the transmitter
trims are in neutral as well.
d)
Before installing the aileron servos in the wing panels you must
attach a servo extension wire to the aileron servo wire. The
typical combined length required is approximately 16”. A 6”
extension wire will usually provide sufficient length. Connect
the servo plug to the extension wire and tape the connectors
together for added security.
e)
A servo wire pull string has been pre-installed in the wing at the
factory. Attach the string to the end of your servo extension
wire, and carefully pull the servo extension wire through the
wing. By that time, the servo itself should be next to the servo
mount cutout and ready for mounting.
Summary of Contents for Edgetra ARF
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