2
Digital propor-
tional
Radio Control
One of many systems available,
please see your local dealer or
club for advice on selecting
your radio.
PROP AND FUEL TANK CHART
NUMBERS IN PARENTHESIS
REFER TO 4-CYCLE ENGINES
___________________________________________
FOR USE AND
ENGINE PROP TANK
SIZE SIZE SIZE
___________________________________________
.40-.51 10/6, 11/4, 11/6 8-10 OUNCE
(.40-.49) (12/6) (8)
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.60-.61 12/6 12 OUNCE
(.60-.91) (14/6) (10-12)
Selecting Radio Control Equipment
The Cub is designed for 4-channel radio control equipment. Many of the
radio systems now available feature “servo reversing” switches which allow you to
reverse the response of the servo. This feature simplifies radio installation and is a
worthwhile consideration when selecting a radio system.
Engine & Propeller
The Cub flies well using any engine size from .40 to .61 (.90 4-cycle). cubicinch
displacement. If you live in a warm climate, or your flying field is approximately
3,000 feet or more above sea level, you should use a .49 engine or larger. The pro-
peller size must be matched with the engine. For example, a .40 engine may use a
10” diameter prop, while a .61 uses 11”. Refer to the prop and fuel tank chart at
lower left.
Balancing your propeller helps to protect your radio from the damaging
effects of vibration. Good balancers are on the market, and generally are
easy to use. We recommend sanding or scraping the heavy blade on the
curved face rather than the flat face, and out near the tip. Try to maintain the normal
airfoil curvature. And avoid scratches which might cause the prop to break.
Adhesives
All our test models were built using cyanoacrylate glue(CA) which is
specially formulated to firmly glue the plywood, hardwood, plastic, and balsa used
in your Cub, and we strongly recommend it. Other good glues to use are“15 Minute
Epoxy” or Aliphatic Resin. They will, however, add considerably to the assembly
time required (they dry a lot slower than CA). Also, Aliphatic Resin does not glue
plastic, so you will need one of the adhesives mentioned above (or similar) for the
plastic parts.
IMPORTANT!
In a few specific areas of assembly we suggest the use of thin type of instant glue (
CA) for example, sheeting the leading edge of the wing.
Other than when specifically recommended, these thin types of glue
should not be used since they do not glue plywood adequately and also
require that your work must be near perfect. Be careful when using instant glue to
install windows, as applying too much glue can sometimes cause fogging to occur.
This can be easily wiped off with a damp rag. A sure way to avoid fogging is to use
either epoxy or Zap Formula 560 canopy glue.
After you have finished gluing the model together, go back and re-glue all the
joints for added strength, and just in case some joints may have been
missed the first time. Be careful not to use too little glue. Too little leaves a
model weak. Since CA almost eliminates waiting for glue joints to dry, you can
work straight through and finish each assembly by following the step-by -step build-
ing sequence. If you use epoxy, you can save time while waiting for one assembly to
dry (the stabilizer, for example) by turning a few pages ahead and starting another
part (the fuselage, perhaps). Check-off boxes are provided at each step so you can
tell at a glance what steps you have completed.
Tack-Cementing
. Sometimes it is necessary to temporarily glue a part
in place that must later be removed. To provide for easy removal of the part
without damage, it should have been glued in place using only a small dab of glue.
This is referred to as “tack-cementing” later on in the instructions.
Using Cyanoacrylate Glue.
CA lets you b uild almost as fast as your hands
can press parts toghether! When pressed into a very thin layer, it sets almost instant-
ly. So be careful, read instrluctions thoroughly and use check-off boxes to avoid
errors (like building two right-hand wings-instead of a left and a right)! CA allows
only for momentary positioning of parts. So be sure to trial fit parts toghether to
check fit and placement before applying glue. After its initial bond, CA continues to
strengthen. CA sets up a bit slower with plywood and hardwood, so hold such joints
together a little longer than you would for balsa. CA in corners takes a while longer
to dry because of its not being a thin layer. The tendency for all instant glues to set
slower on hardwood or plywood and when in a thick layer can be elilminated by
using Kicker, an accelerator for cyanoacrylate glue. Kicker bridges greater gaps,
speeds up slow bonds, and provides strong joint fillets.
Using Epoxy.
Epoxy comes in two parts which need to be mixed before
using. Paper cups and wood coffee stirrers are useful for ixing. When
buying epoxy, check the package to see how long it takes to set (some formulas\
set in 5 minutes, others may take hours). We recommend 15 minute
