Great Planes Yak-55M 50-55cc Sport / 3D ARF - GPMA1230 - Manual (Page 3)

3
SAFETY PRECAUTIONS
Protect Your Model, Yourself & Others …
Follow These Important Safety Precautions
1. Your Yak-55M should not be considered a toy, but rather a
sophisticated, working model that functions very much like
a full-size airplane. Because of its performance capabilities,
the Yak-55M, if not assembled and operated correctly, could
possibly cause injury to yourself or spectators and damage
to property.
2. You must assemble the model according to the instructions .
Do not alter or modify the model, as doing so may result in
an unsafe or unfl yable model. In a few cases the instructions
may differ slightly from the photos. In those instances the
written instructions should be considered as correct.
3. You must take time to build straight, true and strong .
4. You must use an R/C radio system that is in good condition,
a correctly sized engine, and other components as specifi ed
in this instruction manual. All components must be correctly
installed so that the model operates correctly on the ground
and in the air. You must check the operation of the model
and all components before
every fl ight.
5. If you are not an experienced pilot or have not fl own this type
of model before, we recommend that you get the assistance
of an experienced pilot in your R/C club for your fi rst fl ights.
If you’re not a member of a club, your local hobby shop has
information about clubs in your area whose membership
includes experienced pilots.
6. While this kit has been fl ight tested to exceed normal use,
if the plane will be used for extremely high stress fl ying,
such as racing, or if an engine larger than one in the
recommended range is used, the modeler is responsible
for taking steps to reinforce the high stress points and/or
substituting hardware more suitable for the increased stress.
7. WARNING: The cowl and wheel pants included in this kit
are made of fi berglass, the fi bers of which may cause eye,
skin and respiratory tract irritation. Never blow into a part
(wheel pant, cowl) to remove fi berglass dust, as the dust
will blow back into your eyes. Always wear safety goggles,
a particle mask and rubber gloves when grinding, drilling
and sanding fi berglass parts. Vacuum the parts and the
work area thoroughly after working with fi berglass parts.
We, as the kit manufacturer, provide you with a top quality,
thoroughly tested kit and instructions, but ultimately the
quality and fl yability of your fi nished model depends on how
you build it; therefore, we cannot in any way guarantee the
performance of your completed model, and no representations
are expressed or implied as to the performance or safety of
your completed model.
Remember: Take your time and follow the instructions to
end up with a well-built model that is straight and true.
DECISIONS YOU MUST MAKE
This is a partial list of items required to fi nish the Yak-55M that
may require planning or decision making before starting to
build. Order numbers are provided in parentheses.
Radio Equipment
A fi ve-channel radio is the minimum requirement to fl y the Yak-
55M. However, it is recommended that you use a computer
radio with more than fi ve channels. We would recommend at
least a seven channel radio with mixing capabilities and inputs
to put all of the servos on their own channel instead of using
“Y” connectors. When choosing servos be sure to use high
quality servos with torque ratings that are equal or greater
than those listed here. The Yak has very large control surfaces
that will strain inexpensive or lower than recommended torque
rated servos.
Radio Recommendations
❍ Futaba ® 7C (FUTJ67**)
❍ Futaba 10C (FUTJ9150)
❍ Futaba 10CAG (FUTK9255)
Servo Recommendations
❍ Ailerons – Minimum rating of 150 oz-in. Two required.
Futaba 9155 (FUTM0215)
❍ Elevator – Minimum rating of 150 oz-in. Two required.
Futaba 9155 (FUTM0215)
❍ Rudder – Minimum rating of 250 oz-in. One required.
Futaba 9156 (FUTM0216)
(The rudder can also be controlled with two servos
ganged together. Each servo should have at least a
125 oz-in or greater rating if you choose the tandem
servo method.)
❍ Throttle and choke – Any precision servo of at least 30
oz-in is acceptable. Futaba 9001 (FUTM0075)
Battery Recommendations
❍ Receiver battery with a minimum capacity of 4.8V and
3000 mAh HCAM6355)
❍ Ignition battery with a minimum capacity of 1000 mAh
Engine Recommendations
The recommended engine size range for the Yak-55M is a 50
to 55 cc two-stroke gasoline engine. The DLE ™ 55 (DLEG0055)
is a perfect choice for this airplane. This engine provided
enough power to hover and pull straight out from the hover
when coupled with an APC 22x10 propeller (APCQ2201).